1 /*
2 * Copyright (c) 1998-2020 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29 #include <IOKit/assert.h>
30 #include <IOKit/IOKitDebug.h>
31 #include <IOKit/IOLib.h>
32 #include <IOKit/IOMessage.h>
33 #include <IOKit/IOPlatformExpert.h>
34 #include <IOKit/IOService.h>
35 #include <IOKit/IOUserServer.h>
36 #include <IOKit/IOEventSource.h>
37 #include <IOKit/IOWorkLoop.h>
38 #include <IOKit/IOCommand.h>
39 #include <IOKit/IOTimeStamp.h>
40 #include <IOKit/IOReportMacros.h>
41 #include <IOKit/IODeviceTreeSupport.h>
42
43 #include <IOKit/pwr_mgt/IOPMlog.h>
44 #include <IOKit/pwr_mgt/IOPMinformee.h>
45 #include <IOKit/pwr_mgt/IOPMinformeeList.h>
46 #include <IOKit/pwr_mgt/IOPowerConnection.h>
47 #include <IOKit/pwr_mgt/RootDomain.h>
48 #include <IOKit/pwr_mgt/IOPMPrivate.h>
49
50 #include <sys/proc.h>
51 #include <sys/proc_internal.h>
52 #include <sys/sysctl.h>
53 #include <libkern/OSDebug.h>
54 #include <kern/thread.h>
55 #if DEVELOPMENT || DEBUG
56 #include <os/system_event_log.h>
57 #endif /* DEVELOPMENT || DEBUG */
58
59 // Required for notification instrumentation
60 #include "IOServicePrivate.h"
61 #include "IOServicePMPrivate.h"
62 #include "IOKitKernelInternal.h"
63
64 #if USE_SETTLE_TIMER
65 static void settle_timer_expired(thread_call_param_t, thread_call_param_t);
66 #endif
67 static void idle_timer_expired(thread_call_param_t, thread_call_param_t);
68 static void tellKernelClientApplier(OSObject * object, void * arg);
69 static void tellAppClientApplier(OSObject * object, void * arg);
70 static const char * getNotificationPhaseString(uint32_t phase);
71
72 static uint64_t
computeTimeDeltaNS(const AbsoluteTime * start)73 computeTimeDeltaNS( const AbsoluteTime * start )
74 {
75 AbsoluteTime now;
76 uint64_t nsec;
77
78 clock_get_uptime(&now);
79 SUB_ABSOLUTETIME(&now, start);
80 absolutetime_to_nanoseconds(now, &nsec);
81 return nsec;
82 }
83
84 #if PM_VARS_SUPPORT
85 OSDefineMetaClassAndStructors(IOPMprot, OSObject)
86 #endif
87
88 //******************************************************************************
89 // Globals
90 //******************************************************************************
91
92 static bool gIOPMInitialized = false;
93 static uint32_t gIOPMBusyRequestCount = 0;
94 static uint32_t gIOPMWorkInvokeCount = 0;
95 static uint32_t gIOPMTickleGeneration = 0;
96 static IOWorkLoop * gIOPMWorkLoop = NULL;
97 static IOPMRequestQueue * gIOPMRequestQueue = NULL;
98 static IOPMRequestQueue * gIOPMReplyQueue = NULL;
99 static IOPMWorkQueue * gIOPMWorkQueue = NULL;
100 static IOPMCompletionQueue * gIOPMCompletionQueue = NULL;
101 static IOPMRequest * gIOPMRequest = NULL;
102 static IOService * gIOPMRootNode = NULL;
103 static IOPlatformExpert * gPlatform = NULL;
104 static IOLock * gIOPMInitLock = NULL;
105
106 // log setPowerStates and powerStateChange longer than (ns):
107 static uint64_t gIOPMSetPowerStateLogNS =
108 #if defined(__i386__) || defined(__x86_64__)
109 (300ULL * 1000ULL * 1000ULL)
110 #else
111 (50ULL * 1000ULL * 1000ULL)
112 #endif
113 ;
114
115 const OSSymbol * gIOPMPowerClientDevice = NULL;
116 const OSSymbol * gIOPMPowerClientDriver = NULL;
117 const OSSymbol * gIOPMPowerClientChildProxy = NULL;
118 const OSSymbol * gIOPMPowerClientChildren = NULL;
119 const OSSymbol * gIOPMPowerClientRootDomain = NULL;
120
121 static const OSSymbol * gIOPMPowerClientAdvisoryTickle = NULL;
122 static bool gIOPMAdvisoryTickleEnabled = true;
123 static thread_t gIOPMWatchDogThread = NULL;
124 TUNABLE_WRITEABLE(uint32_t, gSleepAckTimeout, "pmtimeout", 0);
125
126 /*
127 * While waiting for a driver callout to complete, we log any instances
128 * that have taken longer than the below period (in milliseconds) to return.
129 */
130 TUNABLE_WRITEABLE(uint32_t, gDriverCalloutTimer, "pmcallouttimer", 2000);
131
132 static uint32_t
getPMRequestType(void)133 getPMRequestType( void )
134 {
135 uint32_t type = kIOPMRequestTypeInvalid;
136 if (gIOPMRequest) {
137 type = gIOPMRequest->getType();
138 }
139 return type;
140 }
141
142 SYSCTL_UINT(_kern, OID_AUTO, pmtimeout, CTLFLAG_RW | CTLFLAG_LOCKED, &gSleepAckTimeout, 0, "Power Management Timeout");
143 SYSCTL_UINT(_kern, OID_AUTO, pmcallouttimer, CTLFLAG_RW | CTLFLAG_LOCKED, &gDriverCalloutTimer, 0, "Power Management Driver Callout Log Timer");
144
145 //******************************************************************************
146 // Macros
147 //******************************************************************************
148
149 #define PM_ERROR(x...) do { kprintf(x);IOLog(x); \
150 } while (false)
151 #define PM_LOG(x...) do { kprintf(x); } while (false)
152
153 #define PM_LOG1(x...) do { \
154 if (kIOLogDebugPower & gIOKitDebug) \
155 kprintf(x); } while (false)
156
157 #define PM_LOG2(x...) do { \
158 if (kIOLogDebugPower & gIOKitDebug) \
159 kprintf(x); } while (false)
160
161 #if 0
162 #define PM_LOG3(x...) do { kprintf(x); } while (false)
163 #else
164 #define PM_LOG3(x...)
165 #endif
166
167 #define RD_LOG(x...) do { \
168 if ((kIOLogPMRootDomain & gIOKitDebug) && \
169 (getPMRootDomain() == this)) { \
170 IOLog("PMRD: " x); \
171 }} while (false)
172 #define PM_ASSERT_IN_GATE(x) \
173 do { \
174 assert(gIOPMWorkLoop->inGate()); \
175 } while(false)
176
177 #define PM_LOCK() IOLockLock(fPMLock)
178 #define PM_UNLOCK() IOLockUnlock(fPMLock)
179 #define PM_LOCK_SLEEP(event, dl) IOLockSleepDeadline(fPMLock, event, dl, THREAD_UNINT)
180 #define PM_LOCK_WAKEUP(event) IOLockWakeup(fPMLock, event, false)
181
182 #define us_per_s 1000000
183 #define ns_per_us 1000
184 #define k30Seconds (30*us_per_s)
185 #define k5Seconds ( 5*us_per_s)
186 #define k7Seconds ( 7*us_per_s)
187 #if !defined(XNU_TARGET_OS_OSX)
188 #define kCanSleepMaxTimeReq k5Seconds
189 #define kWillSleepMaxTimeReq k7Seconds
190 #else /* defined(XNU_TARGET_OS_OSX) */
191 #define kCanSleepMaxTimeReq k30Seconds
192 #define kWillSleepMaxTimeReq k30Seconds
193 #endif /* defined(XNU_TARGET_OS_OSX) */
194 #define kMaxTimeRequested k30Seconds
195 #define kMinAckTimeoutTicks (10*1000000)
196 #define kIOPMTardyAckSPSKey "IOPMTardyAckSetPowerState"
197 #define kIOPMTardyAckPSCKey "IOPMTardyAckPowerStateChange"
198 #define kPwrMgtKey "IOPowerManagement"
199
200 #define OUR_PMLog(t, a, b) do { \
201 if (pwrMgt) { \
202 if (gIOKitDebug & kIOLogPower) \
203 pwrMgt->pmPrint(t, a, b); \
204 if (gIOKitTrace & kIOTracePowerMgmt) \
205 pwrMgt->pmTrace(t, DBG_FUNC_NONE, a, b); \
206 } \
207 } while(0)
208
209 #define OUR_PMLogFuncStart(t, a, b) do { \
210 if (pwrMgt) { \
211 if (gIOKitDebug & kIOLogPower) \
212 pwrMgt->pmPrint(t, a, b); \
213 if (gIOKitTrace & kIOTracePowerMgmt) \
214 pwrMgt->pmTrace(t, DBG_FUNC_START, a, b); \
215 } \
216 } while(0)
217
218 #define OUR_PMLogFuncEnd(t, a, b) do { \
219 if (pwrMgt) { \
220 if (gIOKitDebug & kIOLogPower) \
221 pwrMgt->pmPrint(-t, a, b); \
222 if (gIOKitTrace & kIOTracePowerMgmt) \
223 pwrMgt->pmTrace(t, DBG_FUNC_END, a, b); \
224 } \
225 } while(0)
226
227 #define NS_TO_MS(nsec) ((int)((nsec) / 1000000ULL))
228 #define NS_TO_US(nsec) ((int)((nsec) / 1000ULL))
229
230 #define SUPPORT_IDLE_CANCEL 1
231
232 #define kIOPMPowerStateMax 0xFFFFFFFF
233 #define kInvalidTicklePowerState kIOPMPowerStateMax
234
235 #define kNoTickleCancelWindow (60ULL * 1000ULL * 1000ULL * 1000ULL)
236
237 #define IS_PM_ROOT (this == gIOPMRootNode)
238 #define IS_ROOT_DOMAIN (getPMRootDomain() == this)
239 #define IS_POWER_DROP (StateOrder(fHeadNotePowerState) < StateOrder(fCurrentPowerState))
240 #define IS_POWER_RISE (StateOrder(fHeadNotePowerState) > StateOrder(fCurrentPowerState))
241
242 // log app responses longer than (ns):
243 #define LOG_APP_RESPONSE_TIMES (100ULL * 1000ULL * 1000ULL)
244 // use message tracer to log messages longer than (ns):
245 #define LOG_APP_RESPONSE_MSG_TRACER (3 * 1000ULL * 1000ULL * 1000ULL)
246
247 // log kext responses longer than (ns):
248 #define LOG_KEXT_RESPONSE_TIMES (100ULL * 1000ULL * 1000ULL)
249
250 enum {
251 kReserveDomainPower = 1
252 };
253
254 #define MS_PUSH(n) \
255 do { assert(kIOPM_BadMachineState == fSavedMachineState); \
256 assert(kIOPM_BadMachineState != n); \
257 fSavedMachineState = n; } while (false)
258
259 #define MS_POP() \
260 do { assert(kIOPM_BadMachineState != fSavedMachineState); \
261 fMachineState = fSavedMachineState; \
262 fSavedMachineState = kIOPM_BadMachineState; } while (false)
263
264 #define PM_ACTION_TICKLE(a) \
265 do { if (fPMActions.a) { \
266 (fPMActions.a)(fPMActions.target, this, &fPMActions); } \
267 } while (false)
268
269 #define PM_ACTION_CHANGE(a, x, y) \
270 do { if (fPMActions.a) { \
271 (fPMActions.a)(fPMActions.target, this, &fPMActions, gIOPMRequest, x, y); } \
272 } while (false)
273
274 #define PM_ACTION_CLIENT(a, x, y, z) \
275 do { if (fPMActions.a) { \
276 (fPMActions.a)(fPMActions.target, this, &fPMActions, x, y, z); } \
277 } while (false)
278
279 static OSNumber * copyClientIDForNotification(
280 OSObject *object,
281 IOPMInterestContext *context);
282
283 static void logClientIDForNotification(
284 OSObject *object,
285 IOPMInterestContext *context,
286 const char *logString);
287
288 //*********************************************************************************
289 // PM machine states
290 //
291 // Check kgmacros after modifying machine states.
292 //*********************************************************************************
293
294 enum {
295 kIOPM_Finished = 0,
296
297 kIOPM_OurChangeTellClientsPowerDown = 1,
298 kIOPM_OurChangeTellUserPMPolicyPowerDown = 2,
299 kIOPM_OurChangeTellPriorityClientsPowerDown = 3,
300 kIOPM_OurChangeNotifyInterestedDriversWillChange = 4,
301 kIOPM_OurChangeSetPowerState = 5,
302 kIOPM_OurChangeWaitForPowerSettle = 6,
303 kIOPM_OurChangeNotifyInterestedDriversDidChange = 7,
304 kIOPM_OurChangeTellCapabilityDidChange = 8,
305 kIOPM_OurChangeFinish = 9,
306
307 kIOPM_ParentChangeTellPriorityClientsPowerDown = 10,
308 kIOPM_ParentChangeNotifyInterestedDriversWillChange = 11,
309 kIOPM_ParentChangeSetPowerState = 12,
310 kIOPM_ParentChangeWaitForPowerSettle = 13,
311 kIOPM_ParentChangeNotifyInterestedDriversDidChange = 14,
312 kIOPM_ParentChangeTellCapabilityDidChange = 15,
313 kIOPM_ParentChangeAcknowledgePowerChange = 16,
314
315 kIOPM_NotifyChildrenStart = 17,
316 kIOPM_NotifyChildrenOrdered = 18,
317 kIOPM_NotifyChildrenDelayed = 19,
318 kIOPM_SyncTellClientsPowerDown = 20,
319 kIOPM_SyncTellPriorityClientsPowerDown = 21,
320 kIOPM_SyncNotifyWillChange = 22,
321 kIOPM_SyncNotifyDidChange = 23,
322 kIOPM_SyncTellCapabilityDidChange = 24,
323 kIOPM_SyncFinish = 25,
324 kIOPM_TellCapabilityChangeDone = 26,
325 kIOPM_DriverThreadCallDone = 27,
326
327 kIOPM_BadMachineState = 0xFFFFFFFF
328 };
329
330 //*********************************************************************************
331 // [private static] allocPMInitLock
332 //
333 // Allocate gIOPMInitLock prior to gIOPMWorkLoop initialization.
334 //*********************************************************************************
335
336 void
allocPMInitLock(void)337 IOService::allocPMInitLock( void )
338 {
339 gIOPMInitLock = IOLockAlloc();
340 assert(gIOPMInitLock);
341 }
342
343 //*********************************************************************************
344 // [public] PMinit
345 //
346 // Initialize power management.
347 //*********************************************************************************
348
349 void
PMinit(void)350 IOService::PMinit( void )
351 {
352 if (!initialized) {
353 IOLockLock(gIOPMInitLock);
354 if (!gIOPMInitialized) {
355 gPlatform = getPlatform();
356 gIOPMWorkLoop = IOWorkLoop::workLoop();
357 if (gIOPMWorkLoop) {
358 assert(OSDynamicCast(IOPMrootDomain, this));
359 gIOPMRequestQueue = IOPMRequestQueue::create(
360 this, OSMemberFunctionCast(IOPMRequestQueue::Action,
361 this, &IOService::actionPMRequestQueue));
362
363 gIOPMReplyQueue = IOPMRequestQueue::create(
364 this, OSMemberFunctionCast(IOPMRequestQueue::Action,
365 this, &IOService::actionPMReplyQueue));
366
367 gIOPMWorkQueue = IOPMWorkQueue::create(this,
368 OSMemberFunctionCast(IOPMWorkQueue::Action, this,
369 &IOService::actionPMWorkQueueInvoke),
370 OSMemberFunctionCast(IOPMWorkQueue::Action, this,
371 &IOService::actionPMWorkQueueRetire));
372
373 gIOPMCompletionQueue = IOPMCompletionQueue::create(
374 this, OSMemberFunctionCast(IOPMCompletionQueue::Action,
375 this, &IOService::actionPMCompletionQueue));
376
377 if (gIOPMWorkLoop->addEventSource(gIOPMRequestQueue) !=
378 kIOReturnSuccess) {
379 gIOPMRequestQueue->release();
380 gIOPMRequestQueue = NULL;
381 }
382
383 if (gIOPMWorkLoop->addEventSource(gIOPMReplyQueue) !=
384 kIOReturnSuccess) {
385 gIOPMReplyQueue->release();
386 gIOPMReplyQueue = NULL;
387 }
388
389 if (gIOPMWorkLoop->addEventSource(gIOPMWorkQueue) !=
390 kIOReturnSuccess) {
391 gIOPMWorkQueue->release();
392 gIOPMWorkQueue = NULL;
393 }
394
395 // Must be added after the work queue, which pushes request
396 // to the completion queue without signaling the work loop.
397 if (gIOPMWorkLoop->addEventSource(gIOPMCompletionQueue) !=
398 kIOReturnSuccess) {
399 gIOPMCompletionQueue->release();
400 gIOPMCompletionQueue = NULL;
401 }
402
403 gIOPMPowerClientDevice =
404 OSSymbol::withCStringNoCopy( "DevicePowerState" );
405
406 gIOPMPowerClientDriver =
407 OSSymbol::withCStringNoCopy( "DriverPowerState" );
408
409 gIOPMPowerClientChildProxy =
410 OSSymbol::withCStringNoCopy( "ChildProxyPowerState" );
411
412 gIOPMPowerClientChildren =
413 OSSymbol::withCStringNoCopy( "ChildrenPowerState" );
414
415 gIOPMPowerClientAdvisoryTickle =
416 OSSymbol::withCStringNoCopy( "AdvisoryTicklePowerState" );
417
418 gIOPMPowerClientRootDomain =
419 OSSymbol::withCStringNoCopy( "RootDomainPower" );
420 }
421
422 if (gIOPMRequestQueue && gIOPMReplyQueue && gIOPMCompletionQueue) {
423 gIOPMInitialized = true;
424 }
425
426 #if (DEVELOPMENT || DEBUG)
427 uint32_t setPowerStateLogMS = 0;
428 if (PE_parse_boot_argn("setpowerstate_log", &setPowerStateLogMS, sizeof(setPowerStateLogMS))) {
429 gIOPMSetPowerStateLogNS = setPowerStateLogMS * 1000000ULL;
430 }
431 #endif
432 }
433
434 IOLockUnlock(gIOPMInitLock);
435
436 if (!gIOPMInitialized) {
437 return;
438 }
439
440 pwrMgt = new IOServicePM;
441 pwrMgt->init();
442 setProperty(kPwrMgtKey, pwrMgt);
443
444 queue_init(&pwrMgt->WorkChain);
445 queue_init(&pwrMgt->RequestHead);
446 queue_init(&pwrMgt->PMDriverCallQueue);
447
448 fOwner = this;
449 fPMLock = IOLockAlloc();
450 fInterestedDrivers = new IOPMinformeeList;
451 fInterestedDrivers->initialize();
452 fDesiredPowerState = kPowerStateZero;
453 fDeviceDesire = kPowerStateZero;
454 fInitialPowerChange = true;
455 fInitialSetPowerState = true;
456 fPreviousRequestPowerFlags = 0;
457 fDeviceOverrideEnabled = false;
458 fMachineState = kIOPM_Finished;
459 fSavedMachineState = kIOPM_BadMachineState;
460 fIdleTimerMinPowerState = kPowerStateZero;
461 fActivityLock = IOLockAlloc();
462 fStrictTreeOrder = false;
463 fActivityTicklePowerState = kInvalidTicklePowerState;
464 fAdvisoryTicklePowerState = kInvalidTicklePowerState;
465 fControllingDriver = NULL;
466 fPowerStates = NULL;
467 fNumberOfPowerStates = 0;
468 fCurrentPowerState = kPowerStateZero;
469 fParentsCurrentPowerFlags = 0;
470 fMaxPowerState = kPowerStateZero;
471 fName = getName();
472 fParentsKnowState = false;
473 fSerialNumber = 0;
474 fResponseArray = NULL;
475 fNotifyClientArray = NULL;
476 fCurrentPowerConsumption = kIOPMUnknown;
477 fOverrideMaxPowerState = kIOPMPowerStateMax;
478
479 if (!gIOPMRootNode && (getParentEntry(gIOPowerPlane) == getRegistryRoot())) {
480 gIOPMRootNode = this;
481 fParentsKnowState = true;
482 } else if (getProperty(kIOPMResetPowerStateOnWakeKey) == kOSBooleanTrue) {
483 fResetPowerStateOnWake = true;
484 }
485
486 if (IS_ROOT_DOMAIN) {
487 fWatchdogTimer = thread_call_allocate(
488 &IOService::watchdog_timer_expired, (thread_call_param_t)this);
489 fWatchdogLock = IOLockAlloc();
490
491 fBlockedArray = OSArray::withCapacity(4);
492 }
493
494 fAckTimer = thread_call_allocate(
495 &IOService::ack_timer_expired, (thread_call_param_t)this);
496 #if USE_SETTLE_TIMER
497 fSettleTimer = thread_call_allocate(
498 &settle_timer_expired, (thread_call_param_t)this);
499 #endif
500 fIdleTimer = thread_call_allocate(
501 &idle_timer_expired, (thread_call_param_t)this);
502 fDriverCallTimer = thread_call_allocate(
503 &IOService::pmDriverCalloutTimer, (thread_call_param_t)this);
504 fDriverCallEntry = thread_call_allocate(
505 (thread_call_func_t) &IOService::pmDriverCallout, this);
506 assert(fDriverCallEntry);
507
508 // Check for powerChangeDone override.
509 if (OSMemberFunctionCast(void (*)(void),
510 getResourceService(), &IOService::powerChangeDone) !=
511 OSMemberFunctionCast(void (*)(void),
512 this, &IOService::powerChangeDone)) {
513 fPCDFunctionOverride = true;
514 }
515
516 #if PM_VARS_SUPPORT
517 IOPMprot * prot = new IOPMprot;
518 if (prot) {
519 prot->init();
520 prot->ourName = fName;
521 prot->thePlatform = gPlatform;
522 fPMVars = prot;
523 pm_vars = prot;
524 }
525 #else
526 pm_vars = (void *) (uintptr_t) true;
527 #endif
528
529 initialized = true;
530 }
531 }
532
533 //*********************************************************************************
534 // [private] PMfree
535 //
536 // Free the data created by PMinit. Only called from IOService::free().
537 //*********************************************************************************
538
539 void
PMfree(void)540 IOService::PMfree( void )
541 {
542 initialized = false;
543 pm_vars = NULL;
544
545 if (pwrMgt) {
546 assert(fMachineState == kIOPM_Finished);
547 assert(fInsertInterestSet == NULL);
548 assert(fRemoveInterestSet == NULL);
549 assert(fNotifyChildArray == NULL);
550 assert(queue_empty(&pwrMgt->RequestHead));
551 assert(queue_empty(&fPMDriverCallQueue));
552
553 if (fWatchdogTimer) {
554 thread_call_cancel(fWatchdogTimer);
555 thread_call_free(fWatchdogTimer);
556 fWatchdogTimer = NULL;
557 }
558
559 if (fWatchdogLock) {
560 IOLockFree(fWatchdogLock);
561 fWatchdogLock = NULL;
562 }
563
564 if (fBlockedArray) {
565 fBlockedArray->release();
566 fBlockedArray = NULL;
567 }
568 #if USE_SETTLE_TIMER
569 if (fSettleTimer) {
570 thread_call_cancel(fSettleTimer);
571 thread_call_free(fSettleTimer);
572 fSettleTimer = NULL;
573 }
574 #endif
575 if (fAckTimer) {
576 thread_call_cancel(fAckTimer);
577 thread_call_free(fAckTimer);
578 fAckTimer = NULL;
579 }
580 if (fIdleTimer) {
581 thread_call_cancel(fIdleTimer);
582 thread_call_free(fIdleTimer);
583 fIdleTimer = NULL;
584 }
585 if (fDriverCallEntry) {
586 thread_call_free(fDriverCallEntry);
587 fDriverCallEntry = NULL;
588 }
589 if (fDriverCallTimer) {
590 thread_call_free(fDriverCallTimer);
591 fDriverCallTimer = NULL;
592 }
593 if (fPMLock) {
594 IOLockFree(fPMLock);
595 fPMLock = NULL;
596 }
597 if (fActivityLock) {
598 IOLockFree(fActivityLock);
599 fActivityLock = NULL;
600 }
601 if (fInterestedDrivers) {
602 fInterestedDrivers->release();
603 fInterestedDrivers = NULL;
604 }
605 if (fDriverCallParamSlots && fDriverCallParamPtr) {
606 IODelete(fDriverCallParamPtr, DriverCallParam, fDriverCallParamSlots);
607 fDriverCallParamPtr = NULL;
608 fDriverCallParamSlots = 0;
609 }
610 if (fResponseArray) {
611 fResponseArray->release();
612 fResponseArray = NULL;
613 }
614 if (fNotifyClientArray) {
615 fNotifyClientArray->release();
616 fNotifyClientArray = NULL;
617 }
618 if (fReportBuf && fNumberOfPowerStates) {
619 IOFreeData(fReportBuf, STATEREPORT_BUFSIZE(fNumberOfPowerStates));
620 fReportBuf = NULL;
621 }
622 if (fPowerStates && fNumberOfPowerStates) {
623 IODeleteData(fPowerStates, IOPMPSEntry, fNumberOfPowerStates);
624 fNumberOfPowerStates = 0;
625 fPowerStates = NULL;
626 }
627 if (fPowerClients) {
628 fPowerClients->release();
629 fPowerClients = NULL;
630 }
631
632 #if PM_VARS_SUPPORT
633 if (fPMVars) {
634 fPMVars->release();
635 fPMVars = NULL;
636 }
637 #endif
638
639 pwrMgt->release();
640 pwrMgt = NULL;
641 }
642 }
643
644 void
PMDebug(uint32_t event,uintptr_t param1,uintptr_t param2)645 IOService::PMDebug( uint32_t event, uintptr_t param1, uintptr_t param2 )
646 {
647 OUR_PMLog(event, param1, param2);
648 }
649
650 //*********************************************************************************
651 // [public] joinPMtree
652 //
653 // A policy-maker calls its nub here when initializing, to be attached into
654 // the power management hierarchy. The default function is to call the
655 // platform expert, which knows how to do it. This method is overridden
656 // by a nub subclass which may either know how to do it, or may need to
657 // take other action.
658 //
659 // This may be the only "power management" method used in a nub,
660 // meaning it may not be initialized for power management.
661 //*********************************************************************************
662
663 void
joinPMtree(IOService * driver)664 IOService::joinPMtree( IOService * driver )
665 {
666 IOPlatformExpert * platform;
667
668 platform = getPlatform();
669 assert(platform != NULL);
670 platform->PMRegisterDevice(this, driver);
671 }
672
673 #ifndef __LP64__
674 //*********************************************************************************
675 // [deprecated] youAreRoot
676 //
677 // Power Managment is informing us that we are the root power domain.
678 //*********************************************************************************
679
680 IOReturn
youAreRoot(void)681 IOService::youAreRoot( void )
682 {
683 return IOPMNoErr;
684 }
685 #endif /* !__LP64__ */
686
687 //*********************************************************************************
688 // [public] PMstop
689 //
690 // Immediately stop driver callouts. Schedule an async stop request to detach
691 // from power plane.
692 //*********************************************************************************
693
694 void
PMstop(void)695 IOService::PMstop( void )
696 {
697 IOPMRequest * request;
698
699 if (!initialized) {
700 return;
701 }
702
703 PM_LOCK();
704
705 if (fLockedFlags.PMStop) {
706 PM_LOG2("%s: PMstop() already stopped\n", fName);
707 PM_UNLOCK();
708 return;
709 }
710
711 // Inhibit future driver calls.
712 fLockedFlags.PMStop = true;
713
714 // Wait for all prior driver calls to finish.
715 waitForPMDriverCall();
716
717 PM_UNLOCK();
718
719 // The rest of the work is performed async.
720 request = acquirePMRequest( this, kIOPMRequestTypePMStop );
721 if (request) {
722 PM_LOG2("%s: %p PMstop\n", getName(), OBFUSCATE(this));
723 submitPMRequest( request );
724 }
725 }
726
727 //*********************************************************************************
728 // [private] handlePMstop
729 //
730 // Disconnect the node from all parents and children in the power plane.
731 //*********************************************************************************
732
733 void
handlePMstop(IOPMRequest * request)734 IOService::handlePMstop( IOPMRequest * request )
735 {
736 OSIterator * iter;
737 OSObject * next;
738 IOPowerConnection * connection;
739 IOService * theChild;
740 IOService * theParent;
741
742 PM_ASSERT_IN_GATE();
743 PM_LOG2("%s: %p %s start\n", getName(), OBFUSCATE(this), __FUNCTION__);
744
745 // remove driver from prevent system sleep lists
746 getPMRootDomain()->updatePreventIdleSleepList(this, false);
747 getPMRootDomain()->updatePreventSystemSleepList(this, false);
748
749 // remove the property
750 removeProperty(kPwrMgtKey);
751
752 // detach parents
753 iter = getParentIterator(gIOPowerPlane);
754 if (iter) {
755 while ((next = iter->getNextObject())) {
756 if ((connection = OSDynamicCast(IOPowerConnection, next))) {
757 theParent = (IOService *)connection->copyParentEntry(gIOPowerPlane);
758 if (theParent) {
759 theParent->removePowerChild(connection);
760 theParent->release();
761 }
762 }
763 }
764 iter->release();
765 }
766
767 // detach IOConnections
768 detachAbove( gIOPowerPlane );
769
770 // no more power state changes
771 fParentsKnowState = false;
772
773 // detach children
774 iter = getChildIterator(gIOPowerPlane);
775 if (iter) {
776 while ((next = iter->getNextObject())) {
777 if ((connection = OSDynamicCast(IOPowerConnection, next))) {
778 theChild = ((IOService *)(connection->copyChildEntry(gIOPowerPlane)));
779 if (theChild) {
780 // detach nub from child
781 connection->detachFromChild(theChild, gIOPowerPlane);
782 theChild->release();
783 }
784 // detach us from nub
785 detachFromChild(connection, gIOPowerPlane);
786 }
787 }
788 iter->release();
789 }
790
791 // Remove all interested drivers from the list, including the power
792 // controlling driver.
793 //
794 // Usually, the controlling driver and the policy-maker functionality
795 // are implemented by the same object, and without the deregistration,
796 // the object will be holding an extra retain on itself, and cannot
797 // be freed.
798
799 if (fInterestedDrivers) {
800 IOPMinformeeList * list = fInterestedDrivers;
801 IOPMinformee * item;
802
803 PM_LOCK();
804 while ((item = list->firstInList())) {
805 list->removeFromList(item->whatObject);
806 }
807 PM_UNLOCK();
808 }
809
810 // Clear idle period to prevent idleTimerExpired() from servicing
811 // idle timer expirations.
812
813 fIdleTimerPeriod = 0;
814 if (fIdleTimer && thread_call_cancel(fIdleTimer)) {
815 release();
816 }
817
818 PM_LOG2("%s: %p %s done\n", getName(), OBFUSCATE(this), __FUNCTION__);
819 }
820
821 //*********************************************************************************
822 // [public] addPowerChild
823 //
824 // Power Management is informing us who our children are.
825 //*********************************************************************************
826
827 IOReturn
addPowerChild(IOService * child)828 IOService::addPowerChild( IOService * child )
829 {
830 IOPowerConnection * connection = NULL;
831 IOPMRequest * requests[3] = {NULL, NULL, NULL};
832 OSIterator * iter;
833 bool ok = true;
834
835 if (!child) {
836 return kIOReturnBadArgument;
837 }
838
839 if (!initialized || !child->initialized) {
840 return IOPMNotYetInitialized;
841 }
842
843 OUR_PMLog( kPMLogAddChild, (uintptr_t) child, 0 );
844
845 do {
846 // Is this child already one of our children?
847
848 iter = child->getParentIterator( gIOPowerPlane );
849 if (iter) {
850 IORegistryEntry * entry;
851 OSObject * next;
852
853 while ((next = iter->getNextObject())) {
854 if ((entry = OSDynamicCast(IORegistryEntry, next)) &&
855 isChild(entry, gIOPowerPlane)) {
856 ok = false;
857 break;
858 }
859 }
860 iter->release();
861 }
862 if (!ok) {
863 PM_LOG2("%s: %s (%p) is already a child\n",
864 getName(), child->getName(), OBFUSCATE(child));
865 break;
866 }
867
868 // Add the child to the power plane immediately, but the
869 // joining connection is marked as not ready.
870 // We want the child to appear in the power plane before
871 // returning to the caller, but don't want the caller to
872 // block on the PM work loop.
873
874 connection = new IOPowerConnection;
875 if (!connection) {
876 break;
877 }
878
879 // Create a chain of PM requests to perform the bottom-half
880 // work from the PM work loop.
881
882 requests[0] = acquirePMRequest(
883 /* target */ this,
884 /* type */ kIOPMRequestTypeAddPowerChild1 );
885
886 requests[1] = acquirePMRequest(
887 /* target */ child,
888 /* type */ kIOPMRequestTypeAddPowerChild2 );
889
890 requests[2] = acquirePMRequest(
891 /* target */ this,
892 /* type */ kIOPMRequestTypeAddPowerChild3 );
893
894 if (!requests[0] || !requests[1] || !requests[2]) {
895 break;
896 }
897
898 requests[0]->attachNextRequest( requests[1] );
899 requests[1]->attachNextRequest( requests[2] );
900
901 connection->init();
902 connection->start(this);
903 connection->setAwaitingAck(false);
904 connection->setReadyFlag(false);
905
906 attachToChild( connection, gIOPowerPlane );
907 connection->attachToChild( child, gIOPowerPlane );
908
909 // connection needs to be released
910 requests[0]->fArg0 = connection;
911 requests[1]->fArg0 = connection;
912 requests[2]->fArg0 = connection;
913
914 submitPMRequests( requests, 3 );
915 return kIOReturnSuccess;
916 }while (false);
917
918 if (connection) {
919 connection->release();
920 }
921 if (requests[0]) {
922 releasePMRequest(requests[0]);
923 }
924 if (requests[1]) {
925 releasePMRequest(requests[1]);
926 }
927 if (requests[2]) {
928 releasePMRequest(requests[2]);
929 }
930
931 // Silent failure, to prevent platform drivers from adding the child
932 // to the root domain.
933
934 return kIOReturnSuccess;
935 }
936
937 //*********************************************************************************
938 // [private] addPowerChild1
939 //
940 // Step 1/3 of adding a power child. Called on the power parent.
941 //*********************************************************************************
942
943 void
addPowerChild1(IOPMRequest * request)944 IOService::addPowerChild1( IOPMRequest * request )
945 {
946 IOPMPowerStateIndex tempDesire = kPowerStateZero;
947
948 // Make us temporary usable before adding the child.
949
950 PM_ASSERT_IN_GATE();
951 OUR_PMLog( kPMLogMakeUsable, kPMLogMakeUsable, 0 );
952
953 if (fControllingDriver && inPlane(gIOPowerPlane) && fParentsKnowState) {
954 tempDesire = fHighestPowerState;
955 }
956
957 if ((tempDesire != kPowerStateZero) &&
958 (IS_PM_ROOT || (StateOrder(fMaxPowerState) >= StateOrder(tempDesire)))) {
959 adjustPowerState(tempDesire);
960 }
961 }
962
963 //*********************************************************************************
964 // [private] addPowerChild2
965 //
966 // Step 2/3 of adding a power child. Called on the joining child.
967 // Execution blocked behind addPowerChild1.
968 //*********************************************************************************
969
970 void
addPowerChild2(IOPMRequest * request)971 IOService::addPowerChild2( IOPMRequest * request )
972 {
973 IOPowerConnection * connection = (IOPowerConnection *) request->fArg0;
974 IOService * parent;
975 IOPMPowerFlags powerFlags;
976 bool knowsState;
977 IOPMPowerStateIndex powerState;
978 IOPMPowerStateIndex tempDesire;
979
980 PM_ASSERT_IN_GATE();
981 parent = (IOService *) connection->getParentEntry(gIOPowerPlane);
982
983 if (!parent || !inPlane(gIOPowerPlane)) {
984 PM_LOG("%s: addPowerChild2 not in power plane\n", getName());
985 return;
986 }
987
988 // Parent will be waiting for us to complete this stage.
989 // It is safe to directly access parent's vars.
990
991 knowsState = (parent->fPowerStates) && (parent->fParentsKnowState);
992 powerState = parent->fCurrentPowerState;
993
994 if (knowsState) {
995 powerFlags = parent->fPowerStates[powerState].outputPowerFlags;
996 } else {
997 powerFlags = 0;
998 }
999
1000 // Set our power parent.
1001
1002 OUR_PMLog(kPMLogSetParent, knowsState, powerFlags);
1003
1004 setParentInfo( powerFlags, connection, knowsState );
1005
1006 connection->setReadyFlag(true);
1007
1008 if (fControllingDriver && fParentsKnowState) {
1009 fMaxPowerState = fControllingDriver->driverMaxCapabilityForDomainState(fParentsCurrentPowerFlags);
1010 // initially change into the state we are already in
1011 tempDesire = fControllingDriver->driverInitialPowerStateForDomainState(fParentsCurrentPowerFlags);
1012 fPreviousRequestPowerFlags = (IOPMPowerFlags)(-1);
1013 adjustPowerState(tempDesire);
1014 }
1015 }
1016
1017 //*********************************************************************************
1018 // [private] addPowerChild3
1019 //
1020 // Step 3/3 of adding a power child. Called on the parent.
1021 // Execution blocked behind addPowerChild2.
1022 //*********************************************************************************
1023
1024 void
addPowerChild3(IOPMRequest * request)1025 IOService::addPowerChild3( IOPMRequest * request )
1026 {
1027 IOPowerConnection * connection = (IOPowerConnection *) request->fArg0;
1028 IOService * child;
1029 IOPMrootDomain * rootDomain = getPMRootDomain();
1030
1031 PM_ASSERT_IN_GATE();
1032 child = (IOService *) connection->getChildEntry(gIOPowerPlane);
1033
1034 if (child && inPlane(gIOPowerPlane)) {
1035 if ((this != rootDomain) && child->getProperty("IOPMStrictTreeOrder")) {
1036 PM_LOG1("%s: strict PM order enforced\n", getName());
1037 fStrictTreeOrder = true;
1038 }
1039
1040 if (rootDomain) {
1041 rootDomain->joinAggressiveness( child );
1042 }
1043 } else {
1044 PM_LOG("%s: addPowerChild3 not in power plane\n", getName());
1045 }
1046
1047 connection->release();
1048 }
1049
1050 #ifndef __LP64__
1051 //*********************************************************************************
1052 // [deprecated] setPowerParent
1053 //
1054 // Power Management is informing us who our parent is.
1055 // If we have a controlling driver, find out, given our newly-informed
1056 // power domain state, what state it would be in, and then tell it
1057 // to assume that state.
1058 //*********************************************************************************
1059
1060 IOReturn
setPowerParent(IOPowerConnection * theParent,bool stateKnown,IOPMPowerFlags powerFlags)1061 IOService::setPowerParent(
1062 IOPowerConnection * theParent, bool stateKnown, IOPMPowerFlags powerFlags )
1063 {
1064 return kIOReturnUnsupported;
1065 }
1066 #endif /* !__LP64__ */
1067
1068 //*********************************************************************************
1069 // [public] removePowerChild
1070 //
1071 // Called on a parent whose child is being removed by PMstop().
1072 //*********************************************************************************
1073
1074 IOReturn
removePowerChild(IOPowerConnection * theNub)1075 IOService::removePowerChild( IOPowerConnection * theNub )
1076 {
1077 IORegistryEntry * theChild;
1078
1079 PM_ASSERT_IN_GATE();
1080 OUR_PMLog( kPMLogRemoveChild, 0, 0 );
1081
1082 theNub->retain();
1083
1084 // detach nub from child
1085 theChild = theNub->copyChildEntry(gIOPowerPlane);
1086 if (theChild) {
1087 theNub->detachFromChild(theChild, gIOPowerPlane);
1088 theChild->release();
1089 }
1090 // detach from the nub
1091 detachFromChild(theNub, gIOPowerPlane);
1092
1093 // Are we awaiting an ack from this child?
1094 if (theNub->getAwaitingAck()) {
1095 // yes, pretend we got one
1096 theNub->setAwaitingAck(false);
1097 if (fHeadNotePendingAcks != 0) {
1098 // that's one fewer ack to worry about
1099 fHeadNotePendingAcks--;
1100
1101 // is that the last?
1102 if (fHeadNotePendingAcks == 0) {
1103 stop_ack_timer();
1104 getPMRootDomain()->reset_watchdog_timer(this, 0);
1105
1106 // This parent may have a request in the work queue that is
1107 // blocked on fHeadNotePendingAcks=0. And removePowerChild()
1108 // is called while executing the child's PMstop request so they
1109 // can occur simultaneously. IOPMWorkQueue::checkForWork() must
1110 // restart and check all request queues again.
1111
1112 gIOPMWorkQueue->incrementProducerCount();
1113 }
1114 }
1115 }
1116
1117 theNub->release();
1118
1119 // A child has gone away, re-scan children desires and clamp bits.
1120 // The fPendingAdjustPowerRequest helps to reduce redundant parent work.
1121
1122 if (!fAdjustPowerScheduled) {
1123 IOPMRequest * request;
1124 request = acquirePMRequest( this, kIOPMRequestTypeAdjustPowerState );
1125 if (request) {
1126 submitPMRequest( request );
1127 fAdjustPowerScheduled = true;
1128 }
1129 }
1130
1131 return IOPMNoErr;
1132 }
1133
1134 //*********************************************************************************
1135 // [public] registerPowerDriver
1136 //
1137 // A driver has called us volunteering to control power to our device.
1138 //*********************************************************************************
1139
1140 IOReturn
registerPowerDriver(IOService * powerDriver,IOPMPowerState * powerStates,unsigned long numberOfStates)1141 IOService::registerPowerDriver(
1142 IOService * powerDriver,
1143 IOPMPowerState * powerStates,
1144 unsigned long numberOfStates )
1145 {
1146 IOPMRequest * request;
1147 IOPMPSEntry * powerStatesCopy = NULL;
1148 IOPMPowerStateIndex stateOrder;
1149 IOReturn error = kIOReturnSuccess;
1150
1151 if (!initialized) {
1152 return IOPMNotYetInitialized;
1153 }
1154
1155 if (!powerStates || (numberOfStates < 2)) {
1156 OUR_PMLog(kPMLogControllingDriverErr5, numberOfStates, 0);
1157 return kIOReturnBadArgument;
1158 }
1159
1160 if (!powerDriver || !powerDriver->initialized) {
1161 OUR_PMLog(kPMLogControllingDriverErr4, 0, 0);
1162 return kIOReturnBadArgument;
1163 }
1164
1165 if (powerStates[0].version > kIOPMPowerStateVersion2) {
1166 OUR_PMLog(kPMLogControllingDriverErr1, powerStates[0].version, 0);
1167 return kIOReturnBadArgument;
1168 }
1169
1170 do {
1171 // Make a copy of the supplied power state array.
1172 powerStatesCopy = IONewData(IOPMPSEntry, numberOfStates);
1173 if (!powerStatesCopy) {
1174 error = kIOReturnNoMemory;
1175 break;
1176 }
1177
1178 // Initialize to bogus values
1179 for (IOPMPowerStateIndex i = 0; i < numberOfStates; i++) {
1180 powerStatesCopy[i].stateOrderToIndex = kIOPMPowerStateMax;
1181 }
1182
1183 for (uint32_t i = 0; i < numberOfStates; i++) {
1184 powerStatesCopy[i].capabilityFlags = powerStates[i].capabilityFlags;
1185 powerStatesCopy[i].outputPowerFlags = powerStates[i].outputPowerCharacter;
1186 powerStatesCopy[i].inputPowerFlags = powerStates[i].inputPowerRequirement;
1187 powerStatesCopy[i].staticPower = powerStates[i].staticPower;
1188 #if USE_SETTLE_TIMER
1189 powerStatesCopy[i].settleUpTime = powerStates[i].settleUpTime;
1190 powerStatesCopy[i].settleDownTime = powerStates[i].settleDownTime;
1191 #endif
1192 if (powerStates[i].version >= kIOPMPowerStateVersion2) {
1193 stateOrder = powerStates[i].stateOrder;
1194 } else {
1195 stateOrder = i;
1196 }
1197
1198 if (stateOrder < numberOfStates) {
1199 powerStatesCopy[i].stateOrder = stateOrder;
1200 powerStatesCopy[stateOrder].stateOrderToIndex = i;
1201 }
1202 }
1203
1204 for (IOPMPowerStateIndex i = 0; i < numberOfStates; i++) {
1205 if (powerStatesCopy[i].stateOrderToIndex == kIOPMPowerStateMax) {
1206 // power state order missing
1207 error = kIOReturnBadArgument;
1208 break;
1209 }
1210 }
1211 if (kIOReturnSuccess != error) {
1212 break;
1213 }
1214
1215 request = acquirePMRequest( this, kIOPMRequestTypeRegisterPowerDriver );
1216 if (!request) {
1217 error = kIOReturnNoMemory;
1218 break;
1219 }
1220
1221 powerDriver->retain();
1222 request->fArg0 = (void *) powerDriver;
1223 request->fArg1 = (void *) powerStatesCopy;
1224 request->fArg2 = (void *) numberOfStates;
1225
1226 submitPMRequest( request );
1227 return kIOReturnSuccess;
1228 }while (false);
1229
1230 if (powerStatesCopy) {
1231 IODeleteData(powerStatesCopy, IOPMPSEntry, numberOfStates);
1232 }
1233
1234 return error;
1235 }
1236
1237 //*********************************************************************************
1238 // [private] handleRegisterPowerDriver
1239 //*********************************************************************************
1240
1241 void
handleRegisterPowerDriver(IOPMRequest * request)1242 IOService::handleRegisterPowerDriver( IOPMRequest * request )
1243 {
1244 IOService * powerDriver = (IOService *) request->fArg0;
1245 IOPMPSEntry * powerStates = (IOPMPSEntry *) request->fArg1;
1246 IOPMPowerStateIndex numberOfStates = (IOPMPowerStateIndex) request->fArg2;
1247 IOPMPowerStateIndex i, stateIndex;
1248 IOPMPowerStateIndex lowestPowerState;
1249 IOService * root;
1250 OSIterator * iter;
1251
1252 PM_ASSERT_IN_GATE();
1253 assert(powerStates);
1254 assert(powerDriver);
1255 assert(numberOfStates > 1);
1256
1257 if (!fNumberOfPowerStates) {
1258 OUR_PMLog(kPMLogControllingDriver, numberOfStates, kIOPMPowerStateVersion1);
1259
1260 fPowerStates = powerStates;
1261 fNumberOfPowerStates = numberOfStates;
1262 fControllingDriver = powerDriver;
1263 fCurrentCapabilityFlags = fPowerStates[0].capabilityFlags;
1264
1265 lowestPowerState = fPowerStates[0].stateOrderToIndex;
1266 fHighestPowerState = fPowerStates[numberOfStates - 1].stateOrderToIndex;
1267
1268 {
1269 uint32_t aotFlags;
1270 IOService * service;
1271 OSObject * object;
1272 OSData * data;
1273
1274 // Disallow kIOPMAOTPower states unless device tree enabled
1275
1276 aotFlags = 0;
1277 service = this;
1278 while (service && !service->inPlane(gIODTPlane)) {
1279 service = service->getProvider();
1280 }
1281 if (service) {
1282 object = service->copyProperty(kIOPMAOTPowerKey, gIODTPlane);
1283 data = OSDynamicCast(OSData, object);
1284 if (data && (data->getLength() >= sizeof(uint32_t))) {
1285 aotFlags = ((uint32_t *)data->getBytesNoCopy())[0];
1286 }
1287 OSSafeReleaseNULL(object);
1288 }
1289 if (!aotFlags) {
1290 for (i = 0; i < numberOfStates; i++) {
1291 if (kIOPMAOTPower & fPowerStates[i].inputPowerFlags) {
1292 fPowerStates[i].inputPowerFlags = 0xFFFFFFFF;
1293 fPowerStates[i].capabilityFlags = 0;
1294 fPowerStates[i].outputPowerFlags = 0;
1295 }
1296 }
1297 }
1298 }
1299
1300 // OR'in all the output power flags
1301 fMergedOutputPowerFlags = 0;
1302 fDeviceUsablePowerState = lowestPowerState;
1303 for (i = 0; i < numberOfStates; i++) {
1304 fMergedOutputPowerFlags |= fPowerStates[i].outputPowerFlags;
1305
1306 stateIndex = fPowerStates[i].stateOrderToIndex;
1307 assert(stateIndex < numberOfStates);
1308 if ((fDeviceUsablePowerState == lowestPowerState) &&
1309 (fPowerStates[stateIndex].capabilityFlags & IOPMDeviceUsable)) {
1310 // The minimum power state that the device is usable
1311 fDeviceUsablePowerState = stateIndex;
1312 }
1313 }
1314
1315 // Register powerDriver as interested, unless already done.
1316 // We don't want to register the default implementation since
1317 // it does nothing. One ramification of not always registering
1318 // is the one fewer retain count held.
1319
1320 root = getPlatform()->getProvider();
1321 assert(root);
1322 if (!root ||
1323 ((OSMemberFunctionCast(void (*)(void),
1324 root, &IOService::powerStateDidChangeTo)) !=
1325 ((OSMemberFunctionCast(void (*)(void),
1326 this, &IOService::powerStateDidChangeTo)))) ||
1327 ((OSMemberFunctionCast(void (*)(void),
1328 root, &IOService::powerStateWillChangeTo)) !=
1329 ((OSMemberFunctionCast(void (*)(void),
1330 this, &IOService::powerStateWillChangeTo))))) {
1331 if (fInterestedDrivers->findItem(powerDriver) == NULL) {
1332 PM_LOCK();
1333 fInterestedDrivers->appendNewInformee(powerDriver);
1334 PM_UNLOCK();
1335 }
1336 }
1337
1338 // Examine all existing power clients and perform limit check.
1339
1340 if (fPowerClients &&
1341 (iter = OSCollectionIterator::withCollection(fPowerClients))) {
1342 const OSSymbol * client;
1343 while ((client = (const OSSymbol *) iter->getNextObject())) {
1344 IOPMPowerStateIndex powerState = getPowerStateForClient(client);
1345 if (powerState >= numberOfStates) {
1346 updatePowerClient(client, fHighestPowerState);
1347 }
1348 }
1349 iter->release();
1350 }
1351
1352 // Populate IOPMActions for a few special services
1353 getPMRootDomain()->tagPowerPlaneService(this, &fPMActions, fNumberOfPowerStates - 1);
1354
1355 if (inPlane(gIOPowerPlane) && fParentsKnowState) {
1356 IOPMPowerStateIndex tempDesire;
1357 fMaxPowerState = fControllingDriver->driverMaxCapabilityForDomainState(fParentsCurrentPowerFlags);
1358 // initially change into the state we are already in
1359 tempDesire = fControllingDriver->driverInitialPowerStateForDomainState(fParentsCurrentPowerFlags);
1360 adjustPowerState(tempDesire);
1361 }
1362 } else {
1363 OUR_PMLog(kPMLogControllingDriverErr2, numberOfStates, 0);
1364 IODeleteData(powerStates, IOPMPSEntry, numberOfStates);
1365 }
1366
1367 powerDriver->release();
1368 }
1369
1370 //*********************************************************************************
1371 // [public] registerInterestedDriver
1372 //
1373 // Add the caller to our list of interested drivers and return our current
1374 // power state. If we don't have a power-controlling driver yet, we will
1375 // call this interested driver again later when we do get a driver and find
1376 // out what the current power state of the device is.
1377 //*********************************************************************************
1378
1379 IOPMPowerFlags
registerInterestedDriver(IOService * driver)1380 IOService::registerInterestedDriver( IOService * driver )
1381 {
1382 IOPMRequest * request;
1383 bool signal;
1384
1385 if (!driver || !initialized || !fInterestedDrivers) {
1386 return 0;
1387 }
1388
1389 PM_LOCK();
1390 signal = (!fInsertInterestSet && !fRemoveInterestSet);
1391 if (fInsertInterestSet == NULL) {
1392 fInsertInterestSet = OSSet::withCapacity(4);
1393 }
1394 if (fInsertInterestSet) {
1395 fInsertInterestSet->setObject(driver);
1396 if (fRemoveInterestSet) {
1397 fRemoveInterestSet->removeObject(driver);
1398 }
1399 }
1400 PM_UNLOCK();
1401
1402 if (signal) {
1403 request = acquirePMRequest( this, kIOPMRequestTypeInterestChanged );
1404 if (request) {
1405 submitPMRequest( request );
1406 }
1407 }
1408
1409 // This return value cannot be trusted, but return a value
1410 // for those clients that care.
1411
1412 OUR_PMLog(kPMLogInterestedDriver, kIOPMDeviceUsable, 2);
1413 return kIOPMDeviceUsable;
1414 }
1415
1416 //*********************************************************************************
1417 // [public] deRegisterInterestedDriver
1418 //*********************************************************************************
1419
1420 IOReturn
deRegisterInterestedDriver(IOService * driver)1421 IOService::deRegisterInterestedDriver( IOService * driver )
1422 {
1423 IOPMinformee * item;
1424 IOPMRequest * request;
1425 bool signal;
1426
1427 if (!driver) {
1428 return kIOReturnBadArgument;
1429 }
1430 if (!initialized || !fInterestedDrivers) {
1431 return IOPMNotPowerManaged;
1432 }
1433
1434 PM_LOCK();
1435 if (fInsertInterestSet) {
1436 fInsertInterestSet->removeObject(driver);
1437 }
1438
1439 item = fInterestedDrivers->findItem(driver);
1440 if (!item) {
1441 PM_UNLOCK();
1442 return kIOReturnNotFound;
1443 }
1444
1445 signal = (!fRemoveInterestSet && !fInsertInterestSet);
1446 if (fRemoveInterestSet == NULL) {
1447 fRemoveInterestSet = OSSet::withCapacity(4);
1448 }
1449 if (fRemoveInterestSet) {
1450 fRemoveInterestSet->setObject(driver);
1451 if (item->active) {
1452 item->active = false;
1453 waitForPMDriverCall( driver );
1454 }
1455 }
1456 PM_UNLOCK();
1457
1458 if (signal) {
1459 request = acquirePMRequest( this, kIOPMRequestTypeInterestChanged );
1460 if (request) {
1461 submitPMRequest( request );
1462 }
1463 }
1464
1465 return IOPMNoErr;
1466 }
1467
1468 //*********************************************************************************
1469 // [private] handleInterestChanged
1470 //
1471 // Handle interest added or removed.
1472 //*********************************************************************************
1473
1474 void
handleInterestChanged(IOPMRequest * request)1475 IOService::handleInterestChanged( IOPMRequest * request )
1476 {
1477 IOService * driver;
1478 IOPMinformee * informee;
1479 IOPMinformeeList * list = fInterestedDrivers;
1480
1481 PM_LOCK();
1482
1483 if (fInsertInterestSet) {
1484 while ((driver = (IOService *) fInsertInterestSet->getAnyObject())) {
1485 if (list->findItem(driver) == NULL) {
1486 list->appendNewInformee(driver);
1487 }
1488 fInsertInterestSet->removeObject(driver);
1489 }
1490 fInsertInterestSet->release();
1491 fInsertInterestSet = NULL;
1492 }
1493
1494 if (fRemoveInterestSet) {
1495 while ((driver = (IOService *) fRemoveInterestSet->getAnyObject())) {
1496 informee = list->findItem(driver);
1497 if (informee) {
1498 // Clean-up async interest acknowledgement
1499 if (fHeadNotePendingAcks && informee->timer) {
1500 informee->timer = 0;
1501 fHeadNotePendingAcks--;
1502 }
1503 list->removeFromList(driver);
1504 }
1505 fRemoveInterestSet->removeObject(driver);
1506 }
1507 fRemoveInterestSet->release();
1508 fRemoveInterestSet = NULL;
1509 }
1510
1511 PM_UNLOCK();
1512 }
1513
1514 //*********************************************************************************
1515 // [public] acknowledgePowerChange
1516 //
1517 // After we notified one of the interested drivers or a power-domain child
1518 // of an impending change in power, it has called to say it is now
1519 // prepared for the change. If this object is the last to
1520 // acknowledge this change, we take whatever action we have been waiting
1521 // for.
1522 // That may include acknowledging to our parent. In this case, we do it
1523 // last of all to insure that this doesn't cause the parent to call us some-
1524 // where else and alter data we are relying on here (like the very existance
1525 // of a "current change note".)
1526 //*********************************************************************************
1527
1528 IOReturn
acknowledgePowerChange(IOService * whichObject)1529 IOService::acknowledgePowerChange( IOService * whichObject )
1530 {
1531 IOPMRequest * request;
1532
1533 if (!initialized) {
1534 return IOPMNotYetInitialized;
1535 }
1536 if (!whichObject) {
1537 return kIOReturnBadArgument;
1538 }
1539
1540 request = acquirePMRequest( this, kIOPMRequestTypeAckPowerChange );
1541 if (!request) {
1542 return kIOReturnNoMemory;
1543 }
1544
1545 whichObject->retain();
1546 request->fArg0 = whichObject;
1547
1548 submitPMRequest( request );
1549 return IOPMNoErr;
1550 }
1551
1552 //*********************************************************************************
1553 // [private] handleAcknowledgePowerChange
1554 //*********************************************************************************
1555
1556 bool
handleAcknowledgePowerChange(IOPMRequest * request)1557 IOService::handleAcknowledgePowerChange( IOPMRequest * request )
1558 {
1559 IOPMinformee * informee;
1560 IOPMPowerStateIndex childPower = kIOPMUnknown;
1561 IOService * theChild;
1562 IOService * whichObject;
1563 bool all_acked = false;
1564
1565 PM_ASSERT_IN_GATE();
1566 whichObject = (IOService *) request->fArg0;
1567 assert(whichObject);
1568
1569 // one of our interested drivers?
1570 informee = fInterestedDrivers->findItem( whichObject );
1571 if (informee == NULL) {
1572 if (!isChild(whichObject, gIOPowerPlane)) {
1573 OUR_PMLog(kPMLogAcknowledgeErr1, 0, 0);
1574 goto no_err;
1575 } else {
1576 OUR_PMLog(kPMLogChildAcknowledge, fHeadNotePendingAcks, 0);
1577 }
1578 } else {
1579 OUR_PMLog(kPMLogDriverAcknowledge, fHeadNotePendingAcks, 0);
1580 }
1581
1582 if (fHeadNotePendingAcks != 0) {
1583 assert(fPowerStates != NULL);
1584
1585 // yes, make sure we're expecting acks
1586 if (informee != NULL) {
1587 // it's an interested driver
1588 // make sure we're expecting this ack
1589 if (informee->timer != 0) {
1590 SOCD_TRACE_XNU(PM_INFORM_POWER_CHANGE_ACK,
1591 ADDR(informee->whatObject->getMetaClass()),
1592 ADDR(this->getMetaClass()),
1593 PACK_2X32(VALUE(this->getRegistryEntryID()), VALUE(informee->whatObject->getRegistryEntryID())),
1594 PACK_2X32(VALUE(0), VALUE(fDriverCallReason)));
1595
1596 if (informee->timer > 0) {
1597 uint64_t nsec = computeTimeDeltaNS(&informee->startTime);
1598 if (nsec > gIOPMSetPowerStateLogNS) {
1599 getPMRootDomain()->pmStatsRecordApplicationResponse(
1600 gIOPMStatsDriverPSChangeSlow, informee->whatObject->getName(),
1601 fDriverCallReason, NS_TO_MS(nsec), informee->whatObject->getRegistryEntryID(),
1602 NULL, fHeadNotePowerState, true);
1603 }
1604 }
1605
1606 // mark it acked
1607 informee->timer = 0;
1608 // that's one fewer to worry about
1609 fHeadNotePendingAcks--;
1610 } else {
1611 // this driver has already acked
1612 OUR_PMLog(kPMLogAcknowledgeErr2, 0, 0);
1613 }
1614 } else {
1615 // it's a child
1616 // make sure we're expecting this ack
1617 if (((IOPowerConnection *)whichObject)->getAwaitingAck()) {
1618 // that's one fewer to worry about
1619 fHeadNotePendingAcks--;
1620 ((IOPowerConnection *)whichObject)->setAwaitingAck(false);
1621 theChild = (IOService *)whichObject->copyChildEntry(gIOPowerPlane);
1622 if (theChild) {
1623 childPower = theChild->currentPowerConsumption();
1624 theChild->release();
1625 }
1626 if (childPower == kIOPMUnknown) {
1627 fHeadNotePowerArrayEntry->staticPower = kIOPMUnknown;
1628 } else {
1629 if (fHeadNotePowerArrayEntry->staticPower != kIOPMUnknown) {
1630 fHeadNotePowerArrayEntry->staticPower += childPower;
1631 }
1632 }
1633 }
1634 }
1635
1636 if (fHeadNotePendingAcks == 0) {
1637 // yes, stop the timer
1638 stop_ack_timer();
1639 // and now we can continue
1640 all_acked = true;
1641 getPMRootDomain()->reset_watchdog_timer(this, 0);
1642 }
1643 } else {
1644 OUR_PMLog(kPMLogAcknowledgeErr3, 0, 0); // not expecting anybody to ack
1645 }
1646
1647 no_err:
1648 if (whichObject) {
1649 whichObject->release();
1650 }
1651
1652 return all_acked;
1653 }
1654
1655 //*********************************************************************************
1656 // [public] acknowledgeSetPowerState
1657 //
1658 // After we instructed our controlling driver to change power states,
1659 // it has called to say it has finished doing so.
1660 // We continue to process the power state change.
1661 //*********************************************************************************
1662
1663 IOReturn
acknowledgeSetPowerState(void)1664 IOService::acknowledgeSetPowerState( void )
1665 {
1666 IOPMRequest * request;
1667
1668 if (!initialized) {
1669 return IOPMNotYetInitialized;
1670 }
1671
1672 request = acquirePMRequest( this, kIOPMRequestTypeAckSetPowerState );
1673 if (!request) {
1674 return kIOReturnNoMemory;
1675 }
1676
1677 submitPMRequest( request );
1678 return kIOReturnSuccess;
1679 }
1680
1681 //*********************************************************************************
1682 // [private] handleAcknowledgeSetPowerState
1683 //*********************************************************************************
1684
1685 bool
handleAcknowledgeSetPowerState(IOPMRequest * request __unused)1686 IOService::handleAcknowledgeSetPowerState( IOPMRequest * request __unused)
1687 {
1688 const OSMetaClass *controllingDriverMetaClass = NULL;
1689 uint32_t controllingDriverRegistryEntryID = 0;
1690 bool more = false;
1691 bool trace_this_ack = true;
1692
1693 if (fDriverTimer == -1) {
1694 // driver acked while setPowerState() call is in-flight.
1695 // take this ack, return value from setPowerState() is irrelevant.
1696 OUR_PMLog(kPMLogDriverAcknowledgeSet,
1697 (uintptr_t) this, fDriverTimer);
1698 fDriverTimer = 0;
1699 } else if (fDriverTimer > 0) {
1700 // expected ack, stop the timer
1701 stop_ack_timer();
1702
1703 getPMRootDomain()->reset_watchdog_timer(this, 0);
1704
1705 uint64_t nsec = computeTimeDeltaNS(&fDriverCallStartTime);
1706 if (nsec > gIOPMSetPowerStateLogNS) {
1707 getPMRootDomain()->pmStatsRecordApplicationResponse(
1708 gIOPMStatsDriverPSChangeSlow,
1709 fName, kDriverCallSetPowerState, NS_TO_MS(nsec), getRegistryEntryID(),
1710 NULL, fHeadNotePowerState, true);
1711 }
1712
1713 OUR_PMLog(kPMLogDriverAcknowledgeSet, (uintptr_t) this, fDriverTimer);
1714 fDriverTimer = 0;
1715 more = true;
1716 } else {
1717 // unexpected ack
1718 OUR_PMLog(kPMLogAcknowledgeErr4, (uintptr_t) this, 0);
1719 trace_this_ack = false;
1720 }
1721
1722 if (trace_this_ack) {
1723 if (fControllingDriver) {
1724 controllingDriverMetaClass = fControllingDriver->getMetaClass();
1725 controllingDriverRegistryEntryID = (uint32_t)fControllingDriver->getRegistryEntryID();
1726 }
1727
1728 SOCD_TRACE_XNU(PM_SET_POWER_STATE_ACK,
1729 ADDR(controllingDriverMetaClass),
1730 ADDR(this->getMetaClass()),
1731 PACK_2X32(VALUE(this->getRegistryEntryID()), VALUE(controllingDriverRegistryEntryID)),
1732 PACK_2X32(VALUE(fHeadNotePowerState), VALUE(0)));
1733 }
1734
1735 return more;
1736 }
1737
1738 //*********************************************************************************
1739 // [private] adjustPowerState
1740 //*********************************************************************************
1741
1742 void
adjustPowerState(IOPMPowerStateIndex clamp)1743 IOService::adjustPowerState( IOPMPowerStateIndex clamp )
1744 {
1745 PM_ASSERT_IN_GATE();
1746 computeDesiredState(clamp, false);
1747 if (fControllingDriver && fParentsKnowState && inPlane(gIOPowerPlane)) {
1748 IOPMPowerChangeFlags changeFlags = kIOPMSelfInitiated;
1749
1750 // Indicate that children desires must be ignored, and do not ask
1751 // apps for permission to drop power. This is used by root domain
1752 // for demand sleep.
1753
1754 if (getPMRequestType() == kIOPMRequestTypeRequestPowerStateOverride) {
1755 changeFlags |= (kIOPMIgnoreChildren | kIOPMSkipAskPowerDown);
1756 }
1757
1758 startPowerChange(
1759 /* flags */ changeFlags,
1760 /* power state */ fDesiredPowerState,
1761 /* domain flags */ 0,
1762 /* connection */ NULL,
1763 /* parent flags */ 0);
1764 }
1765 }
1766
1767 //*********************************************************************************
1768 // [public] synchronizePowerTree
1769 //*********************************************************************************
1770
1771 IOReturn
synchronizePowerTree(IOOptionBits options,IOService * notifyRoot)1772 IOService::synchronizePowerTree(
1773 IOOptionBits options,
1774 IOService * notifyRoot )
1775 {
1776 IOPMRequest * request_c = NULL;
1777 IOPMRequest * request_s;
1778
1779 if (this != getPMRootDomain()) {
1780 return kIOReturnBadArgument;
1781 }
1782 if (!initialized) {
1783 return kIOPMNotYetInitialized;
1784 }
1785
1786 OUR_PMLog(kPMLogCSynchronizePowerTree, options, (notifyRoot != NULL));
1787
1788 if (notifyRoot) {
1789 IOPMRequest * nr;
1790
1791 // Cancels don't need to be synchronized.
1792 nr = acquirePMRequest(notifyRoot, kIOPMRequestTypeChildNotifyDelayCancel);
1793 if (nr) {
1794 submitPMRequest(nr);
1795 }
1796
1797 // For display wrangler or any other delay-eligible (dark wake clamped)
1798 // drivers attached to root domain in the power plane.
1799 nr = acquirePMRequest(getPMRootDomain(), kIOPMRequestTypeChildNotifyDelayCancel);
1800 if (nr) {
1801 submitPMRequest(nr);
1802 }
1803 }
1804
1805 request_s = acquirePMRequest( this, kIOPMRequestTypeSynchronizePowerTree );
1806 if (!request_s) {
1807 goto error_no_memory;
1808 }
1809
1810 if (options & kIOPMSyncCancelPowerDown) {
1811 request_c = acquirePMRequest( this, kIOPMRequestTypeIdleCancel );
1812 }
1813 if (request_c) {
1814 request_c->attachNextRequest( request_s );
1815 submitPMRequest(request_c);
1816 }
1817
1818 request_s->fArg0 = (void *)(uintptr_t) options;
1819 submitPMRequest(request_s);
1820
1821 return kIOReturnSuccess;
1822
1823 error_no_memory:
1824 if (request_c) {
1825 releasePMRequest(request_c);
1826 }
1827 if (request_s) {
1828 releasePMRequest(request_s);
1829 }
1830 return kIOReturnNoMemory;
1831 }
1832
1833 //*********************************************************************************
1834 // [private] handleSynchronizePowerTree
1835 //*********************************************************************************
1836
1837 void
handleSynchronizePowerTree(IOPMRequest * request)1838 IOService::handleSynchronizePowerTree( IOPMRequest * request )
1839 {
1840 PM_ASSERT_IN_GATE();
1841 if (fControllingDriver && fParentsKnowState && inPlane(gIOPowerPlane) &&
1842 (fCurrentPowerState == fHighestPowerState)) {
1843 IOPMPowerChangeFlags options = (IOPMPowerChangeFlags)(uintptr_t) request->fArg0;
1844
1845 startPowerChange(
1846 /* flags */ kIOPMSelfInitiated | kIOPMSynchronize |
1847 (options & kIOPMSyncNoChildNotify),
1848 /* power state */ fCurrentPowerState,
1849 /* domain flags */ 0,
1850 /* connection */ NULL,
1851 /* parent flags */ 0);
1852 }
1853 }
1854
1855 #ifndef __LP64__
1856 //*********************************************************************************
1857 // [deprecated] powerDomainWillChangeTo
1858 //
1859 // Called by the power-hierarchy parent notifying of a new power state
1860 // in the power domain.
1861 // We enqueue a parent power-change to our queue of power changes.
1862 // This may or may not cause us to change power, depending on what
1863 // kind of change is occuring in the domain.
1864 //*********************************************************************************
1865
1866 IOReturn
powerDomainWillChangeTo(IOPMPowerFlags newPowerFlags,IOPowerConnection * whichParent)1867 IOService::powerDomainWillChangeTo(
1868 IOPMPowerFlags newPowerFlags,
1869 IOPowerConnection * whichParent )
1870 {
1871 assert(false);
1872 return kIOReturnUnsupported;
1873 }
1874 #endif /* !__LP64__ */
1875
1876 //*********************************************************************************
1877 // [private] handlePowerDomainWillChangeTo
1878 //*********************************************************************************
1879
1880 void
handlePowerDomainWillChangeTo(IOPMRequest * request)1881 IOService::handlePowerDomainWillChangeTo( IOPMRequest * request )
1882 {
1883 IOPMPowerFlags parentPowerFlags = (IOPMPowerFlags) request->fArg0;
1884 IOPowerConnection * whichParent = (IOPowerConnection *) request->fArg1;
1885 IOPMPowerChangeFlags parentChangeFlags = (IOPMPowerChangeFlags)(uintptr_t) request->fArg2;
1886 IOPMPowerChangeFlags myChangeFlags;
1887 OSIterator * iter;
1888 OSObject * next;
1889 IOPowerConnection * connection;
1890 IOPMPowerStateIndex maxPowerState;
1891 IOPMPowerFlags combinedPowerFlags;
1892 IOReturn result = IOPMAckImplied;
1893
1894 PM_ASSERT_IN_GATE();
1895 OUR_PMLog(kPMLogWillChange, parentPowerFlags, 0);
1896
1897 if (!inPlane(gIOPowerPlane) || !whichParent || !whichParent->getAwaitingAck()) {
1898 PM_LOG("%s::%s not in power tree\n", getName(), __FUNCTION__);
1899 goto exit_no_ack;
1900 }
1901
1902 // Combine parents' output power flags.
1903
1904 combinedPowerFlags = 0;
1905
1906 iter = getParentIterator(gIOPowerPlane);
1907 if (iter) {
1908 while ((next = iter->getNextObject())) {
1909 if ((connection = OSDynamicCast(IOPowerConnection, next))) {
1910 if (connection == whichParent) {
1911 combinedPowerFlags |= parentPowerFlags;
1912 } else {
1913 combinedPowerFlags |= connection->parentCurrentPowerFlags();
1914 }
1915 }
1916 }
1917 iter->release();
1918 }
1919
1920 // If our initial change has yet to occur, then defer the power change
1921 // until after the power domain has completed its power transition.
1922
1923 if (fControllingDriver && !fInitialPowerChange) {
1924 maxPowerState = fControllingDriver->driverMaxCapabilityForDomainState(
1925 combinedPowerFlags);
1926
1927 if (parentChangeFlags & kIOPMDomainPowerDrop) {
1928 // fMaxPowerState set a limit on self-initiated power changes.
1929 // Update it before a parent power drop.
1930 fMaxPowerState = maxPowerState;
1931 }
1932
1933 // Use kIOPMSynchronize below instead of kIOPMRootBroadcastFlags
1934 // to avoid propagating the root change flags if any service must
1935 // change power state due to root's will-change notification.
1936 // Root does not change power state for kIOPMSynchronize.
1937
1938 myChangeFlags = kIOPMParentInitiated | kIOPMDomainWillChange |
1939 (parentChangeFlags & kIOPMSynchronize);
1940
1941 result = startPowerChange(
1942 /* flags */ myChangeFlags,
1943 /* power state */ maxPowerState,
1944 /* domain flags */ combinedPowerFlags,
1945 /* connection */ whichParent,
1946 /* parent flags */ parentPowerFlags);
1947 }
1948
1949 // If parent is dropping power, immediately update the parent's
1950 // capability flags. Any future merging of parent(s) combined
1951 // power flags should account for this power drop.
1952
1953 if (parentChangeFlags & kIOPMDomainPowerDrop) {
1954 setParentInfo(parentPowerFlags, whichParent, true);
1955 }
1956
1957 // Parent is expecting an ACK from us. If we did not embark on a state
1958 // transition, i.e. startPowerChange() returned IOPMAckImplied. We are
1959 // still required to issue an ACK to our parent.
1960
1961 if (IOPMAckImplied == result) {
1962 IOService * parent;
1963 parent = (IOService *) whichParent->copyParentEntry(gIOPowerPlane);
1964 assert(parent);
1965 if (parent) {
1966 parent->acknowledgePowerChange( whichParent );
1967 parent->release();
1968 }
1969 }
1970
1971 exit_no_ack:
1972 // Drop the retain from notifyChild().
1973 if (whichParent) {
1974 whichParent->release();
1975 }
1976 }
1977
1978 #ifndef __LP64__
1979 //*********************************************************************************
1980 // [deprecated] powerDomainDidChangeTo
1981 //
1982 // Called by the power-hierarchy parent after the power state of the power domain
1983 // has settled at a new level.
1984 // We enqueue a parent power-change to our queue of power changes.
1985 // This may or may not cause us to change power, depending on what
1986 // kind of change is occuring in the domain.
1987 //*********************************************************************************
1988
1989 IOReturn
powerDomainDidChangeTo(IOPMPowerFlags newPowerFlags,IOPowerConnection * whichParent)1990 IOService::powerDomainDidChangeTo(
1991 IOPMPowerFlags newPowerFlags,
1992 IOPowerConnection * whichParent )
1993 {
1994 assert(false);
1995 return kIOReturnUnsupported;
1996 }
1997 #endif /* !__LP64__ */
1998
1999 //*********************************************************************************
2000 // [private] handlePowerDomainDidChangeTo
2001 //*********************************************************************************
2002
2003 void
handlePowerDomainDidChangeTo(IOPMRequest * request)2004 IOService::handlePowerDomainDidChangeTo( IOPMRequest * request )
2005 {
2006 IOPMPowerFlags parentPowerFlags = (IOPMPowerFlags) request->fArg0;
2007 IOPowerConnection * whichParent = (IOPowerConnection *) request->fArg1;
2008 IOPMPowerChangeFlags parentChangeFlags = (IOPMPowerChangeFlags)(uintptr_t) request->fArg2;
2009 IOPMPowerChangeFlags myChangeFlags;
2010 IOPMPowerStateIndex maxPowerState;
2011 IOPMPowerStateIndex initialDesire = kPowerStateZero;
2012 bool computeDesire = false;
2013 bool desireChanged = false;
2014 bool savedParentsKnowState;
2015 IOReturn result = IOPMAckImplied;
2016
2017 PM_ASSERT_IN_GATE();
2018 OUR_PMLog(kPMLogDidChange, parentPowerFlags, 0);
2019
2020 if (!inPlane(gIOPowerPlane) || !whichParent || !whichParent->getAwaitingAck()) {
2021 PM_LOG("%s::%s not in power tree\n", getName(), __FUNCTION__);
2022 goto exit_no_ack;
2023 }
2024
2025 savedParentsKnowState = fParentsKnowState;
2026
2027 setParentInfo(parentPowerFlags, whichParent, true);
2028
2029 if (fControllingDriver) {
2030 maxPowerState = fControllingDriver->driverMaxCapabilityForDomainState(
2031 fParentsCurrentPowerFlags);
2032
2033 if ((parentChangeFlags & kIOPMDomainPowerDrop) == 0) {
2034 // fMaxPowerState set a limit on self-initiated power changes.
2035 // Update it after a parent power rise.
2036 fMaxPowerState = maxPowerState;
2037 }
2038
2039 if (fInitialPowerChange) {
2040 computeDesire = true;
2041 initialDesire = fControllingDriver->driverInitialPowerStateForDomainState(
2042 fParentsCurrentPowerFlags);
2043 } else if (parentChangeFlags & kIOPMRootChangeUp) {
2044 if (fAdvisoryTickleUsed) {
2045 // On system wake, re-compute the desired power state since
2046 // gIOPMAdvisoryTickleEnabled will change for a full wake,
2047 // which is an input to computeDesiredState(). This is not
2048 // necessary for a dark wake because powerChangeDone() will
2049 // handle the dark to full wake case, but it does no harm.
2050
2051 desireChanged = true;
2052 }
2053
2054 if (fResetPowerStateOnWake) {
2055 // Query the driver for the desired power state on system wake.
2056 // Default implementation returns the lowest power state.
2057
2058 IOPMPowerStateIndex wakePowerState =
2059 fControllingDriver->driverInitialPowerStateForDomainState(
2060 kIOPMRootDomainState | kIOPMPowerOn );
2061
2062 // fDesiredPowerState was adjusted before going to sleep
2063 // with fDeviceDesire at min.
2064
2065 if (StateOrder(wakePowerState) > StateOrder(fDesiredPowerState)) {
2066 // Must schedule a power adjustment if we changed the
2067 // device desire. That will update the desired domain
2068 // power on the parent power connection and ping the
2069 // power parent if necessary.
2070
2071 updatePowerClient(gIOPMPowerClientDevice, wakePowerState);
2072 desireChanged = true;
2073 }
2074 }
2075 }
2076
2077 if (computeDesire || desireChanged) {
2078 computeDesiredState(initialDesire, false);
2079 }
2080
2081 // Absorb and propagate parent's broadcast flags
2082 myChangeFlags = kIOPMParentInitiated | kIOPMDomainDidChange |
2083 (parentChangeFlags & kIOPMRootBroadcastFlags);
2084
2085 if (kIOPMAOTPower & fPowerStates[maxPowerState].inputPowerFlags) {
2086 IOLog("aotPS %s0x%qx[%ld]\n", getName(), getRegistryEntryID(), maxPowerState);
2087 }
2088
2089 result = startPowerChange(
2090 /* flags */ myChangeFlags,
2091 /* power state */ maxPowerState,
2092 /* domain flags */ fParentsCurrentPowerFlags,
2093 /* connection */ whichParent,
2094 /* parent flags */ 0);
2095 }
2096
2097 // Parent is expecting an ACK from us. If we did not embark on a state
2098 // transition, i.e. startPowerChange() returned IOPMAckImplied. We are
2099 // still required to issue an ACK to our parent.
2100
2101 if (IOPMAckImplied == result) {
2102 IOService * parent;
2103 parent = (IOService *) whichParent->copyParentEntry(gIOPowerPlane);
2104 assert(parent);
2105 if (parent) {
2106 parent->acknowledgePowerChange( whichParent );
2107 parent->release();
2108 }
2109 }
2110
2111 // If the parent registers its power driver late, then this is the
2112 // first opportunity to tell our parent about our desire. Or if the
2113 // child's desire changed during a parent change notify.
2114
2115 if (fControllingDriver &&
2116 ((!savedParentsKnowState && fParentsKnowState) || desireChanged)) {
2117 PM_LOG1("%s::powerDomainDidChangeTo parentsKnowState %d\n",
2118 getName(), fParentsKnowState);
2119 requestDomainPower( fDesiredPowerState );
2120 }
2121
2122 exit_no_ack:
2123 // Drop the retain from notifyChild().
2124 if (whichParent) {
2125 whichParent->release();
2126 }
2127 }
2128
2129 //*********************************************************************************
2130 // [private] setParentInfo
2131 //
2132 // Set our connection data for one specific parent, and then combine all the parent
2133 // data together.
2134 //*********************************************************************************
2135
2136 void
setParentInfo(IOPMPowerFlags newPowerFlags,IOPowerConnection * whichParent,bool knowsState)2137 IOService::setParentInfo(
2138 IOPMPowerFlags newPowerFlags,
2139 IOPowerConnection * whichParent,
2140 bool knowsState )
2141 {
2142 OSIterator * iter;
2143 OSObject * next;
2144 IOPowerConnection * conn;
2145
2146 PM_ASSERT_IN_GATE();
2147
2148 // set our connection data
2149 whichParent->setParentCurrentPowerFlags(newPowerFlags);
2150 whichParent->setParentKnowsState(knowsState);
2151
2152 // recompute our parent info
2153 fParentsCurrentPowerFlags = 0;
2154 fParentsKnowState = true;
2155
2156 iter = getParentIterator(gIOPowerPlane);
2157 if (iter) {
2158 while ((next = iter->getNextObject())) {
2159 if ((conn = OSDynamicCast(IOPowerConnection, next))) {
2160 fParentsKnowState &= conn->parentKnowsState();
2161 fParentsCurrentPowerFlags |= conn->parentCurrentPowerFlags();
2162 }
2163 }
2164 iter->release();
2165 }
2166 }
2167
2168 //******************************************************************************
2169 // [private] trackSystemSleepPreventers
2170 //******************************************************************************
2171
2172 void
trackSystemSleepPreventers(IOPMPowerStateIndex oldPowerState,IOPMPowerStateIndex newPowerState,IOPMPowerChangeFlags changeFlags __unused)2173 IOService::trackSystemSleepPreventers(
2174 IOPMPowerStateIndex oldPowerState,
2175 IOPMPowerStateIndex newPowerState,
2176 IOPMPowerChangeFlags changeFlags __unused )
2177 {
2178 IOPMPowerFlags oldCapability, newCapability;
2179
2180 oldCapability = fPowerStates[oldPowerState].capabilityFlags &
2181 (kIOPMPreventIdleSleep | kIOPMPreventSystemSleep);
2182 newCapability = fPowerStates[newPowerState].capabilityFlags &
2183 (kIOPMPreventIdleSleep | kIOPMPreventSystemSleep);
2184
2185 if (fHeadNoteChangeFlags & kIOPMInitialPowerChange) {
2186 oldCapability = 0;
2187 }
2188 if (oldCapability == newCapability) {
2189 return;
2190 }
2191
2192 if ((oldCapability ^ newCapability) & kIOPMPreventIdleSleep) {
2193 bool enablePrevention = ((oldCapability & kIOPMPreventIdleSleep) == 0);
2194 bool idleCancelAllowed = getPMRootDomain()->updatePreventIdleSleepList(
2195 this, enablePrevention);
2196 #if SUPPORT_IDLE_CANCEL
2197 if (idleCancelAllowed && enablePrevention) {
2198 cancelIdlePowerDown(getPMRootDomain());
2199 }
2200 #endif
2201 }
2202
2203 if ((oldCapability ^ newCapability) & kIOPMPreventSystemSleep) {
2204 getPMRootDomain()->updatePreventSystemSleepList(this,
2205 ((oldCapability & kIOPMPreventSystemSleep) == 0));
2206 }
2207 }
2208
2209 //*********************************************************************************
2210 // [public] requestPowerDomainState
2211 //
2212 // Called on a power parent when a child's power requirement changes.
2213 //*********************************************************************************
2214
2215 IOReturn
requestPowerDomainState(IOPMPowerFlags childRequestPowerFlags,IOPowerConnection * childConnection,unsigned long specification)2216 IOService::requestPowerDomainState(
2217 IOPMPowerFlags childRequestPowerFlags,
2218 IOPowerConnection * childConnection,
2219 unsigned long specification )
2220 {
2221 IOPMPowerStateIndex order, powerState;
2222 IOPMPowerFlags outputPowerFlags;
2223 IOService * child;
2224 IOPMRequest * subRequest;
2225 bool adjustPower = false;
2226
2227 if (!initialized) {
2228 return IOPMNotYetInitialized;
2229 }
2230
2231 if (gIOPMWorkLoop->onThread() == false) {
2232 PM_LOG("%s::requestPowerDomainState\n", getName());
2233 return kIOReturnSuccess;
2234 }
2235
2236 OUR_PMLog(kPMLogRequestDomain, childRequestPowerFlags, specification);
2237
2238 if (!isChild(childConnection, gIOPowerPlane)) {
2239 return kIOReturnNotAttached;
2240 }
2241
2242 if (!fControllingDriver || !fNumberOfPowerStates) {
2243 return kIOReturnNotReady;
2244 }
2245
2246 child = (IOService *) childConnection->getChildEntry(gIOPowerPlane);
2247 assert(child);
2248
2249 // Remove flags from child request which we can't possibly supply
2250 childRequestPowerFlags &= fMergedOutputPowerFlags;
2251
2252 // Merge in the power flags contributed by this power parent
2253 // at its current or impending power state.
2254
2255 outputPowerFlags = fPowerStates[fCurrentPowerState].outputPowerFlags;
2256 if (fMachineState != kIOPM_Finished) {
2257 if (IS_POWER_DROP && !IS_ROOT_DOMAIN) {
2258 // Use the lower power state when dropping power.
2259 // Must be careful since a power drop can be cancelled
2260 // from the following states:
2261 // - kIOPM_OurChangeTellClientsPowerDown
2262 // - kIOPM_OurChangeTellPriorityClientsPowerDown
2263 //
2264 // The child must not wait for this parent to raise power
2265 // if the power drop was cancelled. The solution is to cancel
2266 // the power drop if possible, then schedule an adjustment to
2267 // re-evaluate the parent's power state.
2268 //
2269 // Root domain is excluded to avoid idle sleep issues. And allow
2270 // root domain children to pop up when system is going to sleep.
2271
2272 if ((fMachineState == kIOPM_OurChangeTellClientsPowerDown) ||
2273 (fMachineState == kIOPM_OurChangeTellPriorityClientsPowerDown)) {
2274 fDoNotPowerDown = true; // cancel power drop
2275 adjustPower = true;// schedule an adjustment
2276 PM_LOG1("%s: power drop cancelled in state %u by %s\n",
2277 getName(), fMachineState, child->getName());
2278 } else {
2279 // Beyond cancellation point, report the impending state.
2280 outputPowerFlags =
2281 fPowerStates[fHeadNotePowerState].outputPowerFlags;
2282 }
2283 } else if (IS_POWER_RISE) {
2284 // When raising power, must report the output power flags from
2285 // child's perspective. A child power request may arrive while
2286 // parent is transitioning upwards. If a request arrives after
2287 // setParentInfo() has already recorded the output power flags
2288 // for the next power state, then using the power supplied by
2289 // fCurrentPowerState is incorrect, and might cause the child
2290 // to wait when it should not.
2291
2292 outputPowerFlags = childConnection->parentCurrentPowerFlags();
2293 }
2294 }
2295 child->fHeadNoteDomainTargetFlags |= outputPowerFlags;
2296
2297 // Map child's requested power flags to one of our power state.
2298
2299 for (order = 0; order < fNumberOfPowerStates; order++) {
2300 powerState = fPowerStates[order].stateOrderToIndex;
2301 if ((fPowerStates[powerState].outputPowerFlags & childRequestPowerFlags)
2302 == childRequestPowerFlags) {
2303 break;
2304 }
2305 }
2306 if (order >= fNumberOfPowerStates) {
2307 powerState = kPowerStateZero;
2308 }
2309
2310 // Conditions that warrants a power adjustment on this parent.
2311 // Adjust power will also propagate any changes to the child's
2312 // prevent idle/sleep flags towards the root domain.
2313
2314 if (!childConnection->childHasRequestedPower() ||
2315 (powerState != childConnection->getDesiredDomainState())) {
2316 adjustPower = true;
2317 }
2318
2319 #if ENABLE_DEBUG_LOGS
2320 if (adjustPower) {
2321 PM_LOG("requestPowerDomainState[%s]: %s, init %d, %u->%u\n",
2322 getName(), child->getName(),
2323 !childConnection->childHasRequestedPower(),
2324 (uint32_t) childConnection->getDesiredDomainState(),
2325 (uint32_t) powerState);
2326 }
2327 #endif
2328
2329 // Record the child's desires on the connection.
2330 childConnection->setChildHasRequestedPower();
2331 childConnection->setDesiredDomainState( powerState );
2332
2333 // Schedule a request to re-evaluate all children desires and
2334 // adjust power state. Submit a request if one wasn't pending,
2335 // or if the current request is part of a call tree.
2336
2337 if (adjustPower && !fDeviceOverrideEnabled &&
2338 (!fAdjustPowerScheduled || gIOPMRequest->getRootRequest())) {
2339 subRequest = acquirePMRequest(
2340 this, kIOPMRequestTypeAdjustPowerState, gIOPMRequest );
2341 if (subRequest) {
2342 submitPMRequest( subRequest );
2343 fAdjustPowerScheduled = true;
2344 }
2345 }
2346
2347 return kIOReturnSuccess;
2348 }
2349
2350 //*********************************************************************************
2351 // [public] temporaryPowerClampOn
2352 //
2353 // A power domain wants to be clamped to max power until it has children which
2354 // will then determine the power domain state.
2355 //
2356 // We enter the highest state until addPowerChild is called.
2357 //*********************************************************************************
2358
2359 IOReturn
temporaryPowerClampOn(void)2360 IOService::temporaryPowerClampOn( void )
2361 {
2362 return requestPowerState( gIOPMPowerClientChildProxy, kIOPMPowerStateMax );
2363 }
2364
2365 //*********************************************************************************
2366 // [public] makeUsable
2367 //
2368 // Some client of our device is asking that we become usable. Although
2369 // this has not come from a subclassed device object, treat it exactly
2370 // as if it had. In this way, subsequent requests for lower power from
2371 // a subclassed device object will pre-empt this request.
2372 //
2373 // We treat this as a subclass object request to switch to the
2374 // highest power state.
2375 //*********************************************************************************
2376
2377 IOReturn
makeUsable(void)2378 IOService::makeUsable( void )
2379 {
2380 OUR_PMLog(kPMLogMakeUsable, 0, 0);
2381 return requestPowerState( gIOPMPowerClientDevice, kIOPMPowerStateMax );
2382 }
2383
2384 //*********************************************************************************
2385 // [public] currentCapability
2386 //*********************************************************************************
2387
2388 IOPMPowerFlags
currentCapability(void)2389 IOService::currentCapability( void )
2390 {
2391 if (!initialized) {
2392 return IOPMNotPowerManaged;
2393 }
2394
2395 return fCurrentCapabilityFlags;
2396 }
2397
2398 //*********************************************************************************
2399 // [public] changePowerStateTo
2400 //
2401 // Called by our power-controlling driver to change power state. The new desired
2402 // power state is computed and compared against the current power state. If those
2403 // power states differ, then a power state change is initiated.
2404 //*********************************************************************************
2405
2406 IOReturn
changePowerStateTo(unsigned long ordinal)2407 IOService::changePowerStateTo( unsigned long ordinal )
2408 {
2409 OUR_PMLog(kPMLogChangeStateTo, ordinal, 0);
2410 return requestPowerState( gIOPMPowerClientDriver, ordinal );
2411 }
2412
2413 //*********************************************************************************
2414 // [protected] changePowerStateToPriv
2415 //
2416 // Called by our driver subclass to change power state. The new desired power
2417 // state is computed and compared against the current power state. If those
2418 // power states differ, then a power state change is initiated.
2419 //*********************************************************************************
2420
2421 IOReturn
changePowerStateToPriv(unsigned long ordinal)2422 IOService::changePowerStateToPriv( unsigned long ordinal )
2423 {
2424 OUR_PMLog(kPMLogChangeStateToPriv, ordinal, 0);
2425 return requestPowerState( gIOPMPowerClientDevice, ordinal );
2426 }
2427
2428 //*********************************************************************************
2429 // [public] changePowerStateWithOverrideTo
2430 //
2431 // Called by our driver subclass to change power state. The new desired power
2432 // state is computed and compared against the current power state. If those
2433 // power states differ, then a power state change is initiated.
2434 // Override enforced - Children and Driver desires are ignored.
2435 //*********************************************************************************
2436
2437 IOReturn
changePowerStateWithOverrideTo(IOPMPowerStateIndex ordinal,IOPMRequestTag tag)2438 IOService::changePowerStateWithOverrideTo( IOPMPowerStateIndex ordinal,
2439 IOPMRequestTag tag )
2440 {
2441 IOPMRequest * request;
2442
2443 if (!initialized) {
2444 return kIOPMNotYetInitialized;
2445 }
2446
2447 OUR_PMLog(kPMLogChangeStateToPriv, ordinal, 0);
2448
2449 request = acquirePMRequest( this, kIOPMRequestTypeRequestPowerStateOverride );
2450 if (!request) {
2451 return kIOReturnNoMemory;
2452 }
2453
2454 gIOPMPowerClientDevice->retain();
2455 request->fTag = tag;
2456 request->fArg0 = (void *) ordinal;
2457 request->fArg1 = (void *) gIOPMPowerClientDevice;
2458 request->fArg2 = NULL;
2459 #if NOT_READY
2460 if (action) {
2461 request->installCompletionAction( action, target, param );
2462 }
2463 #endif
2464
2465 // Prevent needless downwards power transitions by clamping power
2466 // until the scheduled request is executed.
2467 //
2468 // TODO: review fOverrideMaxPowerState
2469
2470 if (gIOPMWorkLoop->inGate() && (ordinal < fNumberOfPowerStates)) {
2471 fTempClampPowerState = StateMax(fTempClampPowerState, ordinal);
2472 fTempClampCount++;
2473 request->fArg2 = (void *)(uintptr_t) true;
2474
2475 // Place a power state ceiling to prevent any transition to a
2476 // power state higher than fOverrideMaxPowerState.
2477 fOverrideMaxPowerState = ordinal;
2478 }
2479
2480 submitPMRequest( request );
2481 return IOPMNoErr;
2482 }
2483
2484 //*********************************************************************************
2485 // Tagged form of changePowerStateTo()
2486 //*********************************************************************************
2487
2488 IOReturn
changePowerStateWithTagTo(IOPMPowerStateIndex ordinal,IOPMRequestTag tag)2489 IOService::changePowerStateWithTagTo( IOPMPowerStateIndex ordinal, IOPMRequestTag tag )
2490 {
2491 OUR_PMLog(kPMLogChangeStateTo, ordinal, tag);
2492 return requestPowerState(gIOPMPowerClientDriver, ordinal, tag);
2493 }
2494
2495 //*********************************************************************************
2496 // Tagged form of changePowerStateToPriv()
2497 //*********************************************************************************
2498
2499 IOReturn
changePowerStateWithTagToPriv(unsigned long ordinal,IOPMRequestTag tag)2500 IOService::changePowerStateWithTagToPriv( unsigned long ordinal, IOPMRequestTag tag )
2501 {
2502 OUR_PMLog(kPMLogChangeStateToPriv, ordinal, tag);
2503 return requestPowerState(gIOPMPowerClientDevice, ordinal, tag);
2504 }
2505
2506 //*********************************************************************************
2507 // [public] changePowerStateForRootDomain
2508 //
2509 // Adjust the root domain's power desire on the target
2510 //*********************************************************************************
2511
2512 IOReturn
changePowerStateForRootDomain(IOPMPowerStateIndex ordinal)2513 IOService::changePowerStateForRootDomain( IOPMPowerStateIndex ordinal )
2514 {
2515 OUR_PMLog(kPMLogChangeStateForRootDomain, ordinal, 0);
2516 return requestPowerState( gIOPMPowerClientRootDomain, ordinal );
2517 }
2518
2519 //*********************************************************************************
2520 // [public for PMRD] quiescePowerTree
2521 //
2522 // For root domain to issue a request to quiesce the power tree.
2523 // Supplied callback invoked upon completion.
2524 //*********************************************************************************
2525
2526 IOReturn
quiescePowerTree(void * target,IOPMCompletionAction action,void * param)2527 IOService::quiescePowerTree(
2528 void * target, IOPMCompletionAction action, void * param )
2529 {
2530 IOPMRequest * request;
2531
2532 if (!initialized) {
2533 return kIOPMNotYetInitialized;
2534 }
2535 if (!target || !action) {
2536 return kIOReturnBadArgument;
2537 }
2538
2539 OUR_PMLog(kPMLogQuiescePowerTree, 0, 0);
2540
2541 // Target the root node instead of root domain. This is to avoid blocking
2542 // the quiesce request behind an existing root domain request in the work
2543 // queue. Root parent and root domain requests in the work queue must not
2544 // block the completion of the quiesce request.
2545
2546 request = acquirePMRequest(gIOPMRootNode, kIOPMRequestTypeQuiescePowerTree);
2547 if (!request) {
2548 return kIOReturnNoMemory;
2549 }
2550
2551 request->installCompletionAction(target, action, param);
2552
2553 // Submit through the normal request flow. This will make sure any request
2554 // already in the request queue will get pushed over to the work queue for
2555 // execution. Any request submitted after this request may not be serviced.
2556
2557 submitPMRequest( request );
2558 return kIOReturnSuccess;
2559 }
2560
2561 //*********************************************************************************
2562 // [private] requestPowerState
2563 //*********************************************************************************
2564
2565 IOReturn
requestPowerState(const OSSymbol * client,IOPMPowerStateIndex state,IOPMRequestTag tag)2566 IOService::requestPowerState(
2567 const OSSymbol * client,
2568 IOPMPowerStateIndex state,
2569 IOPMRequestTag tag )
2570 {
2571 IOPMRequest * request;
2572
2573 if (!client || (state > UINT_MAX)) {
2574 return kIOReturnBadArgument;
2575 }
2576 if (!initialized) {
2577 return kIOPMNotYetInitialized;
2578 }
2579
2580 request = acquirePMRequest( this, kIOPMRequestTypeRequestPowerState );
2581 if (!request) {
2582 return kIOReturnNoMemory;
2583 }
2584
2585 client->retain();
2586 request->fTag = tag;
2587 request->fArg0 = (void *)(uintptr_t) state;
2588 request->fArg1 = (void *) client;
2589 request->fArg2 = NULL;
2590 #if NOT_READY
2591 if (action) {
2592 request->installCompletionAction( action, target, param );
2593 }
2594 #endif
2595
2596 // Prevent needless downwards power transitions by clamping power
2597 // until the scheduled request is executed.
2598
2599 if (gIOPMWorkLoop->inGate() && (state < fNumberOfPowerStates)) {
2600 fTempClampPowerState = StateMax(fTempClampPowerState, state);
2601 fTempClampCount++;
2602 request->fArg2 = (void *)(uintptr_t) true;
2603 }
2604
2605 submitPMRequest( request );
2606 return IOPMNoErr;
2607 }
2608
2609 //*********************************************************************************
2610 // [private] handleRequestPowerState
2611 //*********************************************************************************
2612
2613 void
handleRequestPowerState(IOPMRequest * request)2614 IOService::handleRequestPowerState( IOPMRequest * request )
2615 {
2616 const OSSymbol * client = (const OSSymbol *) request->fArg1;
2617 IOPMPowerStateIndex state = (IOPMPowerStateIndex) request->fArg0;
2618
2619 PM_ASSERT_IN_GATE();
2620 if (request->fArg2) {
2621 assert(fTempClampCount != 0);
2622 if (fTempClampCount) {
2623 fTempClampCount--;
2624 }
2625 if (!fTempClampCount) {
2626 fTempClampPowerState = kPowerStateZero;
2627 }
2628 }
2629
2630 if (fNumberOfPowerStates && (state >= fNumberOfPowerStates)) {
2631 state = fHighestPowerState;
2632 }
2633
2634 // The power suppression due to changePowerStateWithOverrideTo() expires
2635 // upon the next "device" power request - changePowerStateToPriv().
2636
2637 if ((getPMRequestType() != kIOPMRequestTypeRequestPowerStateOverride) &&
2638 (client == gIOPMPowerClientDevice)) {
2639 fOverrideMaxPowerState = kIOPMPowerStateMax;
2640 }
2641
2642 if ((state == kPowerStateZero) &&
2643 (client != gIOPMPowerClientDevice) &&
2644 (client != gIOPMPowerClientDriver) &&
2645 (client != gIOPMPowerClientChildProxy)) {
2646 removePowerClient(client);
2647 } else {
2648 updatePowerClient(client, state);
2649 }
2650
2651 adjustPowerState();
2652 client->release();
2653 }
2654
2655 //*********************************************************************************
2656 // [private] Helper functions to update/remove power clients.
2657 //*********************************************************************************
2658
2659 void
updatePowerClient(const OSSymbol * client,IOPMPowerStateIndex powerState)2660 IOService::updatePowerClient( const OSSymbol * client, IOPMPowerStateIndex powerState )
2661 {
2662 IOPMPowerStateIndex oldPowerState = kPowerStateZero;
2663
2664 if (powerState > UINT_MAX) {
2665 assert(false);
2666 return;
2667 }
2668
2669 if (!fPowerClients) {
2670 fPowerClients = OSDictionary::withCapacity(4);
2671 }
2672 if (fPowerClients && client) {
2673 OSNumber * num = (OSNumber *) fPowerClients->getObject(client);
2674 if (num) {
2675 oldPowerState = num->unsigned32BitValue();
2676 num->setValue(powerState);
2677 } else {
2678 num = OSNumber::withNumber(powerState, 32);
2679 if (num) {
2680 fPowerClients->setObject(client, num);
2681 num->release();
2682 }
2683 }
2684
2685 PM_ACTION_CLIENT(actionUpdatePowerClient, client, oldPowerState, powerState);
2686 }
2687 }
2688
2689 void
removePowerClient(const OSSymbol * client)2690 IOService::removePowerClient( const OSSymbol * client )
2691 {
2692 if (fPowerClients && client) {
2693 fPowerClients->removeObject(client);
2694 }
2695 }
2696
2697 IOPMPowerStateIndex
getPowerStateForClient(const OSSymbol * client)2698 IOService::getPowerStateForClient( const OSSymbol * client )
2699 {
2700 IOPMPowerStateIndex powerState = kPowerStateZero;
2701
2702 if (fPowerClients && client) {
2703 OSNumber * num = (OSNumber *) fPowerClients->getObject(client);
2704 if (num) {
2705 powerState = num->unsigned32BitValue();
2706 }
2707 }
2708 return powerState;
2709 }
2710
2711 //*********************************************************************************
2712 // [protected] powerOverrideOnPriv
2713 //*********************************************************************************
2714
2715 IOReturn
powerOverrideOnPriv(void)2716 IOService::powerOverrideOnPriv( void )
2717 {
2718 IOPMRequest * request;
2719
2720 if (!initialized) {
2721 return IOPMNotYetInitialized;
2722 }
2723
2724 if (gIOPMWorkLoop->inGate()) {
2725 fDeviceOverrideEnabled = true;
2726 return IOPMNoErr;
2727 }
2728
2729 request = acquirePMRequest( this, kIOPMRequestTypePowerOverrideOnPriv );
2730 if (!request) {
2731 return kIOReturnNoMemory;
2732 }
2733
2734 submitPMRequest( request );
2735 return IOPMNoErr;
2736 }
2737
2738 //*********************************************************************************
2739 // [protected] powerOverrideOffPriv
2740 //*********************************************************************************
2741
2742 IOReturn
powerOverrideOffPriv(void)2743 IOService::powerOverrideOffPriv( void )
2744 {
2745 IOPMRequest * request;
2746
2747 if (!initialized) {
2748 return IOPMNotYetInitialized;
2749 }
2750
2751 if (gIOPMWorkLoop->inGate()) {
2752 fDeviceOverrideEnabled = false;
2753 return IOPMNoErr;
2754 }
2755
2756 request = acquirePMRequest( this, kIOPMRequestTypePowerOverrideOffPriv );
2757 if (!request) {
2758 return kIOReturnNoMemory;
2759 }
2760
2761 submitPMRequest( request );
2762 return IOPMNoErr;
2763 }
2764
2765 //*********************************************************************************
2766 // [private] handlePowerOverrideChanged
2767 //*********************************************************************************
2768
2769 void
handlePowerOverrideChanged(IOPMRequest * request)2770 IOService::handlePowerOverrideChanged( IOPMRequest * request )
2771 {
2772 PM_ASSERT_IN_GATE();
2773 if (request->getType() == kIOPMRequestTypePowerOverrideOnPriv) {
2774 OUR_PMLog(kPMLogOverrideOn, 0, 0);
2775 fDeviceOverrideEnabled = true;
2776 } else {
2777 OUR_PMLog(kPMLogOverrideOff, 0, 0);
2778 fDeviceOverrideEnabled = false;
2779 }
2780
2781 adjustPowerState();
2782 }
2783
2784 //*********************************************************************************
2785 // [private] computeDesiredState
2786 //*********************************************************************************
2787
2788 void
computeDesiredState(unsigned long localClamp,bool computeOnly)2789 IOService::computeDesiredState( unsigned long localClamp, bool computeOnly )
2790 {
2791 OSIterator * iter;
2792 OSObject * next;
2793 IOPowerConnection * connection;
2794 IOPMPowerStateIndex desiredState = kPowerStateZero;
2795 IOPMPowerStateIndex newPowerState = kPowerStateZero;
2796 bool hasChildren = false;
2797
2798 // Desired power state is always 0 without a controlling driver.
2799
2800 if (!fNumberOfPowerStates) {
2801 fDesiredPowerState = kPowerStateZero;
2802 return;
2803 }
2804
2805 // Examine the children's desired power state.
2806
2807 iter = getChildIterator(gIOPowerPlane);
2808 if (iter) {
2809 while ((next = iter->getNextObject())) {
2810 if ((connection = OSDynamicCast(IOPowerConnection, next))) {
2811 if (connection->getReadyFlag() == false) {
2812 PM_LOG3("[%s] %s: connection not ready\n",
2813 getName(), __FUNCTION__);
2814 continue;
2815 }
2816 if (connection->childHasRequestedPower()) {
2817 hasChildren = true;
2818 }
2819 desiredState = StateMax(connection->getDesiredDomainState(), desiredState);
2820 }
2821 }
2822 iter->release();
2823 }
2824 if (hasChildren) {
2825 updatePowerClient(gIOPMPowerClientChildren, desiredState);
2826 } else {
2827 removePowerClient(gIOPMPowerClientChildren);
2828 }
2829
2830 // Iterate through all power clients to determine the min power state.
2831
2832 iter = OSCollectionIterator::withCollection(fPowerClients);
2833 if (iter) {
2834 const OSSymbol * client;
2835 while ((client = (const OSSymbol *) iter->getNextObject())) {
2836 // Ignore child and driver when override is in effect.
2837 if ((fDeviceOverrideEnabled ||
2838 (getPMRequestType() == kIOPMRequestTypeRequestPowerStateOverride)) &&
2839 ((client == gIOPMPowerClientChildren) ||
2840 (client == gIOPMPowerClientDriver))) {
2841 continue;
2842 }
2843
2844 // Ignore child proxy when children are present.
2845 if (hasChildren && (client == gIOPMPowerClientChildProxy)) {
2846 continue;
2847 }
2848
2849 // Advisory tickles are irrelevant unless system is in full wake
2850 if (client == gIOPMPowerClientAdvisoryTickle &&
2851 !gIOPMAdvisoryTickleEnabled) {
2852 continue;
2853 }
2854
2855 desiredState = getPowerStateForClient(client);
2856 assert(desiredState < fNumberOfPowerStates);
2857 PM_LOG1(" %u %s\n",
2858 (uint32_t) desiredState, client->getCStringNoCopy());
2859
2860 newPowerState = StateMax(newPowerState, desiredState);
2861
2862 if (client == gIOPMPowerClientDevice) {
2863 fDeviceDesire = desiredState;
2864 }
2865 }
2866 iter->release();
2867 }
2868
2869 // Factor in the temporary power desires.
2870
2871 newPowerState = StateMax(newPowerState, localClamp);
2872 newPowerState = StateMax(newPowerState, fTempClampPowerState);
2873
2874 // Limit check against max power override.
2875
2876 newPowerState = StateMin(newPowerState, fOverrideMaxPowerState);
2877
2878 // Limit check against number of power states.
2879
2880 if (newPowerState >= fNumberOfPowerStates) {
2881 newPowerState = fHighestPowerState;
2882 }
2883
2884 if (getPMRootDomain()->isAOTMode()) {
2885 if ((kIOPMPreventIdleSleep & fPowerStates[newPowerState].capabilityFlags)
2886 && !(kIOPMPreventIdleSleep & fPowerStates[fDesiredPowerState].capabilityFlags)) {
2887 getPMRootDomain()->claimSystemWakeEvent(this, kIOPMWakeEventAOTExit, getName(), NULL);
2888 }
2889 }
2890
2891 fDesiredPowerState = newPowerState;
2892
2893 PM_LOG1(" temp %u, clamp %u, current %u, new %u\n",
2894 (uint32_t) localClamp, (uint32_t) fTempClampPowerState,
2895 (uint32_t) fCurrentPowerState, (uint32_t) newPowerState);
2896
2897 if (!computeOnly) {
2898 // Restart idle timer if possible when device desire has increased.
2899 // Or if an advisory desire exists.
2900
2901 if (fIdleTimerPeriod && fIdleTimerStopped) {
2902 restartIdleTimer();
2903 }
2904
2905 // Invalidate cached tickle power state when desires change, and not
2906 // due to a tickle request. In case the driver has requested a lower
2907 // power state, but the tickle is caching a higher power state which
2908 // will drop future tickles until the cached value is lowered or in-
2909 // validated. The invalidation must occur before the power transition
2910 // to avoid dropping a necessary tickle.
2911
2912 if ((getPMRequestType() != kIOPMRequestTypeActivityTickle) &&
2913 (fActivityTicklePowerState != kInvalidTicklePowerState)) {
2914 IOLockLock(fActivityLock);
2915 fActivityTicklePowerState = kInvalidTicklePowerState;
2916 IOLockUnlock(fActivityLock);
2917 }
2918 }
2919 }
2920
2921 //*********************************************************************************
2922 // [public] currentPowerConsumption
2923 //
2924 //*********************************************************************************
2925
2926 unsigned long
currentPowerConsumption(void)2927 IOService::currentPowerConsumption( void )
2928 {
2929 if (!initialized) {
2930 return kIOPMUnknown;
2931 }
2932
2933 return fCurrentPowerConsumption;
2934 }
2935
2936 //*********************************************************************************
2937 // [deprecated] getPMworkloop
2938 //*********************************************************************************
2939
2940 #ifndef __LP64__
2941 IOWorkLoop *
getPMworkloop(void)2942 IOService::getPMworkloop( void )
2943 {
2944 return gIOPMWorkLoop;
2945 }
2946 #endif
2947
2948 #if NOT_YET
2949
2950 //*********************************************************************************
2951 // Power Parent/Children Applier
2952 //*********************************************************************************
2953
2954 static void
applyToPowerChildren(IOService * service,IOServiceApplierFunction applier,void * context,IOOptionBits options)2955 applyToPowerChildren(
2956 IOService * service,
2957 IOServiceApplierFunction applier,
2958 void * context,
2959 IOOptionBits options )
2960 {
2961 PM_ASSERT_IN_GATE();
2962
2963 IORegistryEntry * entry;
2964 IORegistryIterator * iter;
2965 IOPowerConnection * connection;
2966 IOService * child;
2967
2968 iter = IORegistryIterator::iterateOver(service, gIOPowerPlane, options);
2969 if (iter) {
2970 while ((entry = iter->getNextObject())) {
2971 // Get child of IOPowerConnection objects
2972 if ((connection = OSDynamicCast(IOPowerConnection, entry))) {
2973 child = (IOService *) connection->copyChildEntry(gIOPowerPlane);
2974 if (child) {
2975 (*applier)(child, context);
2976 child->release();
2977 }
2978 }
2979 }
2980 iter->release();
2981 }
2982 }
2983
2984 static void
applyToPowerParent(IOService * service,IOServiceApplierFunction applier,void * context,IOOptionBits options)2985 applyToPowerParent(
2986 IOService * service,
2987 IOServiceApplierFunction applier,
2988 void * context,
2989 IOOptionBits options )
2990 {
2991 PM_ASSERT_IN_GATE();
2992
2993 IORegistryEntry * entry;
2994 IORegistryIterator * iter;
2995 IOPowerConnection * connection;
2996 IOService * parent;
2997
2998 iter = IORegistryIterator::iterateOver(service, gIOPowerPlane,
2999 options | kIORegistryIterateParents);
3000 if (iter) {
3001 while ((entry = iter->getNextObject())) {
3002 // Get child of IOPowerConnection objects
3003 if ((connection = OSDynamicCast(IOPowerConnection, entry))) {
3004 parent = (IOService *) connection->copyParentEntry(gIOPowerPlane);
3005 if (parent) {
3006 (*applier)(parent, context);
3007 parent->release();
3008 }
3009 }
3010 }
3011 iter->release();
3012 }
3013 }
3014
3015 #endif /* NOT_YET */
3016
3017 // MARK: -
3018 // MARK: Activity Tickle & Idle Timer
3019
3020 void
setAdvisoryTickleEnable(bool enable)3021 IOService::setAdvisoryTickleEnable( bool enable )
3022 {
3023 gIOPMAdvisoryTickleEnabled = enable;
3024 }
3025
3026 //*********************************************************************************
3027 // [public] activityTickle
3028 //
3029 // The tickle with parameter kIOPMSuperclassPolicy1 causes the activity
3030 // flag to be set, and the device state checked. If the device has been
3031 // powered down, it is powered up again.
3032 // The tickle with parameter kIOPMSubclassPolicy is ignored here and
3033 // should be intercepted by a subclass.
3034 //*********************************************************************************
3035
3036 bool
activityTickle(unsigned long type,unsigned long stateNumber)3037 IOService::activityTickle( unsigned long type, unsigned long stateNumber )
3038 {
3039 if (!initialized) {
3040 return true; // no power change
3041 }
3042
3043 if (!fPowerStates) {
3044 // registerPowerDriver may not have completed
3045 IOPMRequest * request;
3046
3047 request = acquirePMRequest( this, kIOPMRequestTypeDeferredActivityTickle );
3048 if (request) {
3049 request->fArg0 = (void *) type;
3050 request->fArg1 = (void *)(uintptr_t) stateNumber;
3051 submitPMRequest(request);
3052 }
3053 // Returns false if the activityTickle might cause a transition to a
3054 // higher powered state. We don't know, so this seems safest.
3055 return false;
3056 }
3057
3058 return _activityTickle(type, stateNumber);
3059 }
3060
3061 //*********************************************************************************
3062 // [private] handleDeferredActivityTickle
3063 //*********************************************************************************
3064
3065 void
handleDeferredActivityTickle(IOPMRequest * request)3066 IOService::handleDeferredActivityTickle( IOPMRequest * request )
3067 {
3068 unsigned long type = (unsigned long) request->fArg1;
3069 unsigned long stateNumber = (unsigned long) request->fArg2;
3070
3071 if (!fPowerStates) {
3072 // registerPowerDriver was not called before activityTickle()
3073 return;
3074 }
3075 (void) _activityTickle(type, stateNumber);
3076 }
3077
3078 //*********************************************************************************
3079 // [private] _activityTickle
3080 //
3081 // The tickle with parameter kIOPMSuperclassPolicy1 causes the activity
3082 // flag to be set, and the device state checked. If the device has been
3083 // powered down, it is powered up again.
3084 // The tickle with parameter kIOPMSubclassPolicy is ignored here and
3085 // should be intercepted by a subclass.
3086 //*********************************************************************************
3087
3088 bool
_activityTickle(unsigned long type,unsigned long stateNumber)3089 IOService::_activityTickle( unsigned long type, unsigned long stateNumber )
3090 {
3091 IOPMRequest * request;
3092 bool noPowerChange = true;
3093 uint32_t tickleFlags;
3094
3095 if ((type == kIOPMSuperclassPolicy1) && StateOrder(stateNumber)) {
3096 IOLockLock(fActivityLock);
3097
3098 // Record device activity for the idle timer handler.
3099
3100 fDeviceWasActive = true;
3101 fActivityTickleCount++;
3102 clock_get_uptime(&fDeviceActiveTimestamp);
3103
3104 PM_ACTION_TICKLE(actionActivityTickle);
3105
3106 // Record the last tickle power state.
3107 // This helps to filter out redundant tickles as
3108 // this function may be called from the data path.
3109
3110 if ((fActivityTicklePowerState == kInvalidTicklePowerState)
3111 || StateOrder(fActivityTicklePowerState) < StateOrder(stateNumber)) {
3112 fActivityTicklePowerState = stateNumber;
3113 noPowerChange = false;
3114
3115 tickleFlags = kTickleTypeActivity | kTickleTypePowerRise;
3116 request = acquirePMRequest( this, kIOPMRequestTypeActivityTickle );
3117 if (request) {
3118 request->fArg0 = (void *) stateNumber;
3119 request->fArg1 = (void *)(uintptr_t) tickleFlags;
3120 request->fArg2 = (void *)(uintptr_t) gIOPMTickleGeneration;
3121 submitPMRequest(request);
3122 }
3123 }
3124
3125 IOLockUnlock(fActivityLock);
3126 } else if ((type == kIOPMActivityTickleTypeAdvisory) &&
3127 ((stateNumber = fDeviceUsablePowerState) != kPowerStateZero)) {
3128 IOLockLock(fActivityLock);
3129
3130 fAdvisoryTickled = true;
3131
3132 if (fAdvisoryTicklePowerState != stateNumber) {
3133 fAdvisoryTicklePowerState = stateNumber;
3134 noPowerChange = false;
3135
3136 tickleFlags = kTickleTypeAdvisory | kTickleTypePowerRise;
3137 request = acquirePMRequest( this, kIOPMRequestTypeActivityTickle );
3138 if (request) {
3139 request->fArg0 = (void *) stateNumber;
3140 request->fArg1 = (void *)(uintptr_t) tickleFlags;
3141 request->fArg2 = (void *)(uintptr_t) gIOPMTickleGeneration;
3142 submitPMRequest(request);
3143 }
3144 }
3145
3146 IOLockUnlock(fActivityLock);
3147 }
3148
3149 // Returns false if the activityTickle might cause a transition to a
3150 // higher powered state, true otherwise.
3151
3152 return noPowerChange;
3153 }
3154
3155 //*********************************************************************************
3156 // [private] handleActivityTickle
3157 //*********************************************************************************
3158
3159 void
handleActivityTickle(IOPMRequest * request)3160 IOService::handleActivityTickle( IOPMRequest * request )
3161 {
3162 IOPMPowerStateIndex ticklePowerState = (IOPMPowerStateIndex) request->fArg0;
3163 IOPMPowerStateIndex tickleFlags = (IOPMPowerStateIndex) request->fArg1;
3164 uint32_t tickleGeneration = (uint32_t)(uintptr_t) request->fArg2;
3165 bool adjustPower = false;
3166
3167 PM_ASSERT_IN_GATE();
3168 if (fResetPowerStateOnWake && (tickleGeneration != gIOPMTickleGeneration)) {
3169 // Drivers that don't want power restored on wake will drop any
3170 // tickles that pre-dates the current system wake. The model is
3171 // that each wake is a fresh start, with power state depressed
3172 // until a new tickle or an explicit power up request from the
3173 // driver. It is possible for the PM work loop to enter the
3174 // system sleep path with tickle requests queued.
3175
3176 return;
3177 }
3178
3179 if (tickleFlags & kTickleTypeActivity) {
3180 IOPMPowerStateIndex deviceDesireOrder = StateOrder(fDeviceDesire);
3181 IOPMPowerStateIndex idleTimerGeneration = ticklePowerState; // kTickleTypePowerDrop
3182
3183 if (tickleFlags & kTickleTypePowerRise) {
3184 if ((StateOrder(ticklePowerState) > deviceDesireOrder) &&
3185 (ticklePowerState < fNumberOfPowerStates)) {
3186 fIdleTimerMinPowerState = ticklePowerState;
3187 updatePowerClient(gIOPMPowerClientDevice, ticklePowerState);
3188 adjustPower = true;
3189 }
3190 } else if ((deviceDesireOrder > StateOrder(fIdleTimerMinPowerState)) &&
3191 (idleTimerGeneration == fIdleTimerGeneration)) {
3192 // Power drop due to idle timer expiration.
3193 // Do not allow idle timer to reduce power below tickle power.
3194 // This prevents the idle timer from decreasing the device desire
3195 // to zero and cancelling the effect of a pre-sleep tickle when
3196 // system wakes up to doze state, while the device is unable to
3197 // raise its power state to satisfy the tickle.
3198
3199 deviceDesireOrder--;
3200 if (deviceDesireOrder < fNumberOfPowerStates) {
3201 ticklePowerState = fPowerStates[deviceDesireOrder].stateOrderToIndex;
3202 updatePowerClient(gIOPMPowerClientDevice, ticklePowerState);
3203 adjustPower = true;
3204 }
3205 }
3206 } else { // advisory tickle
3207 if (tickleFlags & kTickleTypePowerRise) {
3208 if ((ticklePowerState == fDeviceUsablePowerState) &&
3209 (ticklePowerState < fNumberOfPowerStates)) {
3210 updatePowerClient(gIOPMPowerClientAdvisoryTickle, ticklePowerState);
3211 fHasAdvisoryDesire = true;
3212 fAdvisoryTickleUsed = true;
3213 adjustPower = true;
3214 } else {
3215 IOLockLock(fActivityLock);
3216 fAdvisoryTicklePowerState = kInvalidTicklePowerState;
3217 IOLockUnlock(fActivityLock);
3218 }
3219 } else if (fHasAdvisoryDesire) {
3220 removePowerClient(gIOPMPowerClientAdvisoryTickle);
3221 fHasAdvisoryDesire = false;
3222 adjustPower = true;
3223 }
3224 }
3225
3226 if (adjustPower) {
3227 adjustPowerState();
3228 }
3229 }
3230
3231 //******************************************************************************
3232 // [public] setIdleTimerPeriod
3233 //
3234 // A subclass policy-maker is using our standard idleness detection service.
3235 // Start the idle timer. Period is in seconds.
3236 //******************************************************************************
3237
3238 IOReturn
setIdleTimerPeriod(unsigned long period)3239 IOService::setIdleTimerPeriod( unsigned long period )
3240 {
3241 if (!initialized) {
3242 return IOPMNotYetInitialized;
3243 }
3244
3245 OUR_PMLog(kPMLogSetIdleTimerPeriod, period, fIdleTimerPeriod);
3246
3247 if (period > INT_MAX) {
3248 return kIOReturnBadArgument;
3249 }
3250
3251 IOPMRequest * request =
3252 acquirePMRequest( this, kIOPMRequestTypeSetIdleTimerPeriod );
3253 if (!request) {
3254 return kIOReturnNoMemory;
3255 }
3256
3257 request->fArg0 = (void *) period;
3258 submitPMRequest( request );
3259
3260 return kIOReturnSuccess;
3261 }
3262
3263 IOReturn
setIgnoreIdleTimer(bool ignore)3264 IOService::setIgnoreIdleTimer( bool ignore )
3265 {
3266 if (!initialized) {
3267 return IOPMNotYetInitialized;
3268 }
3269
3270 OUR_PMLog(kIOPMRequestTypeIgnoreIdleTimer, ignore, 0);
3271
3272 IOPMRequest * request =
3273 acquirePMRequest( this, kIOPMRequestTypeIgnoreIdleTimer );
3274 if (!request) {
3275 return kIOReturnNoMemory;
3276 }
3277
3278 request->fArg0 = (void *) ignore;
3279 submitPMRequest( request );
3280
3281 return kIOReturnSuccess;
3282 }
3283
3284 //******************************************************************************
3285 // [public] nextIdleTimeout
3286 //
3287 // Returns how many "seconds from now" the device should idle into its
3288 // next lowest power state.
3289 //******************************************************************************
3290
3291 SInt32
nextIdleTimeout(AbsoluteTime currentTime,AbsoluteTime lastActivity,unsigned int powerState)3292 IOService::nextIdleTimeout(
3293 AbsoluteTime currentTime,
3294 AbsoluteTime lastActivity,
3295 unsigned int powerState)
3296 {
3297 AbsoluteTime delta;
3298 UInt64 delta_ns;
3299 SInt32 delta_secs;
3300 SInt32 delay_secs;
3301
3302 // Calculate time difference using funky macro from clock.h.
3303 delta = currentTime;
3304 SUB_ABSOLUTETIME(&delta, &lastActivity);
3305
3306 // Figure it in seconds.
3307 absolutetime_to_nanoseconds(delta, &delta_ns);
3308 delta_secs = (SInt32)(delta_ns / NSEC_PER_SEC);
3309
3310 // Be paranoid about delta somehow exceeding timer period.
3311 if (delta_secs < (int) fIdleTimerPeriod) {
3312 delay_secs = (int) fIdleTimerPeriod - delta_secs;
3313 } else {
3314 delay_secs = (int) fIdleTimerPeriod;
3315 }
3316
3317 return (SInt32)delay_secs;
3318 }
3319
3320 //*********************************************************************************
3321 // [public] start_PM_idle_timer
3322 //*********************************************************************************
3323
3324 void
start_PM_idle_timer(void)3325 IOService::start_PM_idle_timer( void )
3326 {
3327 static const int maxTimeout = 100000;
3328 static const int minTimeout = 1;
3329 AbsoluteTime uptime, deadline;
3330 SInt32 idle_in = 0;
3331 boolean_t pending;
3332
3333 if (!initialized || !fIdleTimerPeriod ||
3334 ((unsigned int) fCurrentPowerState != fCurrentPowerState)) {
3335 return;
3336 }
3337
3338 IOLockLock(fActivityLock);
3339
3340 clock_get_uptime(&uptime);
3341
3342 // Subclasses may modify idle sleep algorithm
3343 idle_in = nextIdleTimeout(uptime, fDeviceActiveTimestamp, (unsigned int) fCurrentPowerState);
3344
3345 // Check for out-of range responses
3346 if (idle_in > maxTimeout) {
3347 // use standard implementation
3348 idle_in = IOService::nextIdleTimeout(uptime,
3349 fDeviceActiveTimestamp,
3350 (unsigned int) fCurrentPowerState);
3351 } else if (idle_in < minTimeout) {
3352 idle_in = fIdleTimerPeriod;
3353 }
3354
3355 IOLockUnlock(fActivityLock);
3356
3357 fNextIdleTimerPeriod = idle_in;
3358 fIdleTimerStartTime = uptime;
3359
3360 retain();
3361 clock_interval_to_absolutetime_interval(idle_in, kSecondScale, &deadline);
3362 ADD_ABSOLUTETIME(&deadline, &uptime);
3363 pending = thread_call_enter_delayed(fIdleTimer, deadline);
3364 if (pending) {
3365 release();
3366 }
3367 }
3368
3369 //*********************************************************************************
3370 // [private] restartIdleTimer
3371 //*********************************************************************************
3372
3373 void
restartIdleTimer(void)3374 IOService::restartIdleTimer( void )
3375 {
3376 if (fDeviceDesire != kPowerStateZero) {
3377 fIdleTimerStopped = false;
3378 fActivityTickleCount = 0;
3379 start_PM_idle_timer();
3380 } else if (fHasAdvisoryDesire) {
3381 fIdleTimerStopped = false;
3382 start_PM_idle_timer();
3383 } else {
3384 fIdleTimerStopped = true;
3385 }
3386 }
3387
3388 //*********************************************************************************
3389 // idle_timer_expired
3390 //*********************************************************************************
3391
3392 static void
idle_timer_expired(thread_call_param_t arg0,thread_call_param_t arg1)3393 idle_timer_expired(
3394 thread_call_param_t arg0, thread_call_param_t arg1 )
3395 {
3396 IOService * me = (IOService *) arg0;
3397
3398 if (gIOPMWorkLoop) {
3399 gIOPMWorkLoop->runAction(
3400 OSMemberFunctionCast(IOWorkLoop::Action, me,
3401 &IOService::idleTimerExpired),
3402 me);
3403 }
3404
3405 me->release();
3406 }
3407
3408 //*********************************************************************************
3409 // [private] idleTimerExpired
3410 //
3411 // The idle timer has expired. If there has been activity since the last
3412 // expiration, just restart the timer and return. If there has not been
3413 // activity, switch to the next lower power state and restart the timer.
3414 //*********************************************************************************
3415
3416 void
idleTimerExpired(void)3417 IOService::idleTimerExpired( void )
3418 {
3419 IOPMRequest * request;
3420 bool restartTimer = true;
3421 uint32_t tickleFlags;
3422
3423 if (!initialized || !fIdleTimerPeriod || fIdleTimerStopped ||
3424 fLockedFlags.PMStop) {
3425 return;
3426 }
3427
3428 fIdleTimerStartTime = 0;
3429
3430 IOLockLock(fActivityLock);
3431
3432 // Check for device activity (tickles) over last timer period.
3433
3434 if (fDeviceWasActive) {
3435 // Device was active - do not drop power, restart timer.
3436 fDeviceWasActive = false;
3437 } else if (!fIdleTimerIgnored) {
3438 // No device activity - drop power state by one level.
3439 // Decrement the cached tickle power state when possible.
3440 // This value may be kInvalidTicklePowerState before activityTickle()
3441 // is called, but the power drop request must be issued regardless.
3442
3443 if ((fActivityTicklePowerState != kInvalidTicklePowerState) &&
3444 (fActivityTicklePowerState != kPowerStateZero)) {
3445 fActivityTicklePowerState--;
3446 }
3447
3448 tickleFlags = kTickleTypeActivity | kTickleTypePowerDrop;
3449 request = acquirePMRequest( this, kIOPMRequestTypeActivityTickle );
3450 if (request) {
3451 request->fArg0 = (void *)(uintptr_t) fIdleTimerGeneration;
3452 request->fArg1 = (void *)(uintptr_t) tickleFlags;
3453 request->fArg2 = (void *)(uintptr_t) gIOPMTickleGeneration;
3454 submitPMRequest( request );
3455
3456 // Do not restart timer until after the tickle request has been
3457 // processed.
3458
3459 restartTimer = false;
3460 }
3461 }
3462
3463 if (fAdvisoryTickled) {
3464 fAdvisoryTickled = false;
3465 } else if (fHasAdvisoryDesire) {
3466 // Want new tickles to turn into pm request after we drop the lock
3467 fAdvisoryTicklePowerState = kInvalidTicklePowerState;
3468
3469 tickleFlags = kTickleTypeAdvisory | kTickleTypePowerDrop;
3470 request = acquirePMRequest( this, kIOPMRequestTypeActivityTickle );
3471 if (request) {
3472 request->fArg0 = (void *)(uintptr_t) fIdleTimerGeneration;
3473 request->fArg1 = (void *)(uintptr_t) tickleFlags;
3474 request->fArg2 = (void *)(uintptr_t) gIOPMTickleGeneration;
3475 submitPMRequest( request );
3476
3477 // Do not restart timer until after the tickle request has been
3478 // processed.
3479
3480 restartTimer = false;
3481 }
3482 }
3483
3484 IOLockUnlock(fActivityLock);
3485
3486 if (restartTimer) {
3487 start_PM_idle_timer();
3488 }
3489 }
3490
3491 #ifndef __LP64__
3492 //*********************************************************************************
3493 // [deprecated] PM_idle_timer_expiration
3494 //*********************************************************************************
3495
3496 void
PM_idle_timer_expiration(void)3497 IOService::PM_idle_timer_expiration( void )
3498 {
3499 }
3500
3501 //*********************************************************************************
3502 // [deprecated] command_received
3503 //*********************************************************************************
3504
3505 void
command_received(void * statePtr,void *,void *,void *)3506 IOService::command_received( void *statePtr, void *, void *, void * )
3507 {
3508 }
3509 #endif /* !__LP64__ */
3510
3511 //*********************************************************************************
3512 // [public] setAggressiveness
3513 //
3514 // Pass on the input parameters to all power domain children. All those which are
3515 // power domains will pass it on to their children, etc.
3516 //*********************************************************************************
3517
3518 IOReturn
setAggressiveness(unsigned long type,unsigned long newLevel)3519 IOService::setAggressiveness( unsigned long type, unsigned long newLevel )
3520 {
3521 return kIOReturnSuccess;
3522 }
3523
3524 //*********************************************************************************
3525 // [public] getAggressiveness
3526 //
3527 // Called by the user client.
3528 //*********************************************************************************
3529
3530 IOReturn
getAggressiveness(unsigned long type,unsigned long * currentLevel)3531 IOService::getAggressiveness( unsigned long type, unsigned long * currentLevel )
3532 {
3533 IOPMrootDomain * rootDomain = getPMRootDomain();
3534
3535 if (!rootDomain) {
3536 return kIOReturnNotReady;
3537 }
3538
3539 return rootDomain->getAggressiveness( type, currentLevel );
3540 }
3541
3542 //*********************************************************************************
3543 // [public] getPowerState
3544 //
3545 //*********************************************************************************
3546
3547 UInt32
getPowerState(void)3548 IOService::getPowerState( void )
3549 {
3550 if (!initialized) {
3551 return kPowerStateZero;
3552 }
3553
3554 return (UInt32) fCurrentPowerState;
3555 }
3556
3557 #ifndef __LP64__
3558 //*********************************************************************************
3559 // [deprecated] systemWake
3560 //
3561 // Pass this to all power domain children. All those which are
3562 // power domains will pass it on to their children, etc.
3563 //*********************************************************************************
3564
3565 IOReturn
systemWake(void)3566 IOService::systemWake( void )
3567 {
3568 OSIterator * iter;
3569 OSObject * next;
3570 IOPowerConnection * connection;
3571 IOService * theChild;
3572
3573 iter = getChildIterator(gIOPowerPlane);
3574 if (iter) {
3575 while ((next = iter->getNextObject())) {
3576 if ((connection = OSDynamicCast(IOPowerConnection, next))) {
3577 if (connection->getReadyFlag() == false) {
3578 PM_LOG3("[%s] %s: connection not ready\n",
3579 getName(), __FUNCTION__);
3580 continue;
3581 }
3582
3583 theChild = (IOService *)connection->copyChildEntry(gIOPowerPlane);
3584 if (theChild) {
3585 theChild->systemWake();
3586 theChild->release();
3587 }
3588 }
3589 }
3590 iter->release();
3591 }
3592
3593 if (fControllingDriver != NULL) {
3594 if (fControllingDriver->didYouWakeSystem()) {
3595 makeUsable();
3596 }
3597 }
3598
3599 return IOPMNoErr;
3600 }
3601
3602 //*********************************************************************************
3603 // [deprecated] temperatureCriticalForZone
3604 //*********************************************************************************
3605
3606 IOReturn
temperatureCriticalForZone(IOService * whichZone)3607 IOService::temperatureCriticalForZone( IOService * whichZone )
3608 {
3609 IOService * theParent;
3610 IOService * theNub;
3611
3612 OUR_PMLog(kPMLogCriticalTemp, 0, 0);
3613
3614 if (inPlane(gIOPowerPlane) && !IS_PM_ROOT) {
3615 theNub = (IOService *)copyParentEntry(gIOPowerPlane);
3616 if (theNub) {
3617 theParent = (IOService *)theNub->copyParentEntry(gIOPowerPlane);
3618 theNub->release();
3619 if (theParent) {
3620 theParent->temperatureCriticalForZone(whichZone);
3621 theParent->release();
3622 }
3623 }
3624 }
3625 return IOPMNoErr;
3626 }
3627 #endif /* !__LP64__ */
3628
3629 // MARK: -
3630 // MARK: Power Change (Common)
3631
3632 //*********************************************************************************
3633 // [private] startPowerChange
3634 //
3635 // All power state changes starts here.
3636 //*********************************************************************************
3637
3638 IOReturn
startPowerChange(IOPMPowerChangeFlags changeFlags,IOPMPowerStateIndex powerState,IOPMPowerFlags domainFlags,IOPowerConnection * parentConnection,IOPMPowerFlags parentFlags)3639 IOService::startPowerChange(
3640 IOPMPowerChangeFlags changeFlags,
3641 IOPMPowerStateIndex powerState,
3642 IOPMPowerFlags domainFlags,
3643 IOPowerConnection * parentConnection,
3644 IOPMPowerFlags parentFlags )
3645 {
3646 uint32_t savedPMActionsState;
3647
3648 PM_ASSERT_IN_GATE();
3649 assert( fMachineState == kIOPM_Finished );
3650 assert( powerState < fNumberOfPowerStates );
3651
3652 if (powerState >= fNumberOfPowerStates) {
3653 return IOPMAckImplied;
3654 }
3655
3656 fIsPreChange = true;
3657 savedPMActionsState = fPMActions.state;
3658 PM_ACTION_CHANGE(actionPowerChangeOverride, &powerState, &changeFlags);
3659
3660 // rdar://problem/55040032
3661 // Schedule a power adjustment after removing the power clamp
3662 // to inform our power parent(s) about our latest desired domain
3663 // power state. For a self-initiated change, let OurChangeStart()
3664 // automatically request parent power when necessary.
3665 if (!fAdjustPowerScheduled &&
3666 ((changeFlags & kIOPMSelfInitiated) == 0) &&
3667 ((fPMActions.state & kPMActionsStatePowerClamped) == 0) &&
3668 ((savedPMActionsState & kPMActionsStatePowerClamped) != 0)) {
3669 IOPMRequest * request = acquirePMRequest(this, kIOPMRequestTypeAdjustPowerState);
3670 if (request) {
3671 submitPMRequest(request);
3672 fAdjustPowerScheduled = true;
3673 }
3674 }
3675
3676 if (changeFlags & kIOPMExpireIdleTimer) {
3677 // Root domain requested removal of tickle influence
3678 if (StateOrder(fDeviceDesire) > StateOrder(powerState)) {
3679 // Reset device desire down to the clamped power state
3680 updatePowerClient(gIOPMPowerClientDevice, powerState);
3681 computeDesiredState(kPowerStateZero, true);
3682
3683 // Invalidate tickle cache so the next tickle will issue a request
3684 IOLockLock(fActivityLock);
3685 fDeviceWasActive = false;
3686 fActivityTicklePowerState = kInvalidTicklePowerState;
3687 IOLockUnlock(fActivityLock);
3688
3689 fIdleTimerMinPowerState = kPowerStateZero;
3690 }
3691 }
3692
3693 // Root domain's override handler may cancel the power change by
3694 // setting the kIOPMNotDone flag.
3695
3696 if (changeFlags & kIOPMNotDone) {
3697 return IOPMAckImplied;
3698 }
3699
3700 // Forks to either Driver or Parent initiated power change paths.
3701
3702 fHeadNoteChangeFlags = changeFlags;
3703 fHeadNotePowerState = powerState;
3704 fHeadNotePowerArrayEntry = &fPowerStates[powerState];
3705 fHeadNoteParentConnection = NULL;
3706
3707 if (changeFlags & kIOPMSelfInitiated) {
3708 if (changeFlags & kIOPMSynchronize) {
3709 OurSyncStart();
3710 } else {
3711 OurChangeStart();
3712 }
3713 return 0;
3714 } else {
3715 assert(changeFlags & kIOPMParentInitiated);
3716 fHeadNoteDomainFlags = domainFlags;
3717 fHeadNoteParentFlags = parentFlags;
3718 fHeadNoteParentConnection = parentConnection;
3719 return ParentChangeStart();
3720 }
3721 }
3722
3723 //*********************************************************************************
3724 // [private] notifyInterestedDrivers
3725 //*********************************************************************************
3726
3727 bool
notifyInterestedDrivers(void)3728 IOService::notifyInterestedDrivers( void )
3729 {
3730 IOPMinformee * informee;
3731 IOPMinformeeList * list = fInterestedDrivers;
3732 DriverCallParam * param;
3733 unsigned long numItems;
3734 uint32_t count;
3735 uint32_t skipCnt = 0;
3736
3737 PM_ASSERT_IN_GATE();
3738 assert( fDriverCallParamCount == 0 );
3739 assert( fHeadNotePendingAcks == 0 );
3740
3741 fHeadNotePendingAcks = 0;
3742
3743 numItems = list->numberOfItems();
3744 if (!numItems || ((uint32_t) numItems != numItems)) {
3745 goto done; // interested drivers count out of range
3746 }
3747 count = (uint32_t) numItems;
3748
3749 // Allocate an array of interested drivers and their return values
3750 // for the callout thread. Everything else is still "owned" by the
3751 // PM work loop, which can run to process acknowledgePowerChange()
3752 // responses.
3753
3754 param = (DriverCallParam *) fDriverCallParamPtr;
3755 if (count > fDriverCallParamSlots) {
3756 if (fDriverCallParamSlots) {
3757 assert(fDriverCallParamPtr);
3758 IODelete(fDriverCallParamPtr, DriverCallParam, fDriverCallParamSlots);
3759 fDriverCallParamPtr = NULL;
3760 fDriverCallParamSlots = 0;
3761 }
3762
3763 param = IONew(DriverCallParam, count);
3764 if (!param) {
3765 goto done; // no memory
3766 }
3767 fDriverCallParamPtr = (void *) param;
3768 fDriverCallParamSlots = count;
3769 }
3770
3771 informee = list->firstInList();
3772 assert(informee);
3773 for (IOItemCount i = 0, arrayIdx = 0; i < count; i++) {
3774 if (fInitialSetPowerState || (fHeadNoteChangeFlags & kIOPMInitialPowerChange)) {
3775 // Skip notifying self, if 'kIOPMInitialDeviceState' is set and
3776 // this is the initial power state change
3777 if ((this == informee->whatObject) &&
3778 (fHeadNotePowerArrayEntry->capabilityFlags & kIOPMInitialDeviceState)) {
3779 skipCnt++;
3780 continue;
3781 }
3782 }
3783 informee->timer = -1;
3784 param[arrayIdx].Target = informee;
3785 informee->retain();
3786 informee = list->nextInList( informee );
3787 arrayIdx++;
3788 }
3789
3790 count -= skipCnt;
3791 if (!count) {
3792 goto done;
3793 }
3794 fDriverCallParamCount = count;
3795 fHeadNotePendingAcks = count;
3796
3797 // Block state machine and wait for callout completion.
3798 assert(!fDriverCallBusy);
3799 fDriverCallBusy = true;
3800 thread_call_enter( fDriverCallEntry );
3801 return true;
3802
3803 done:
3804 // Return false if there are no interested drivers or could not schedule
3805 // callout thread due to error.
3806 return false;
3807 }
3808
3809 //*********************************************************************************
3810 // [private] notifyInterestedDriversDone
3811 //*********************************************************************************
3812
3813 void
notifyInterestedDriversDone(void)3814 IOService::notifyInterestedDriversDone( void )
3815 {
3816 IOPMinformee * informee;
3817 IOItemCount count;
3818 DriverCallParam * param;
3819 IOReturn result;
3820 int maxTimeout = 0;
3821
3822 PM_ASSERT_IN_GATE();
3823 assert( fDriverCallBusy == false );
3824 assert( fMachineState == kIOPM_DriverThreadCallDone );
3825
3826 param = (DriverCallParam *) fDriverCallParamPtr;
3827 count = fDriverCallParamCount;
3828
3829 if (param && count) {
3830 for (IOItemCount i = 0; i < count; i++, param++) {
3831 informee = (IOPMinformee *) param->Target;
3832 result = param->Result;
3833
3834 if ((result == IOPMAckImplied) || (result < 0)) {
3835 // Interested driver return IOPMAckImplied.
3836 // If informee timer is zero, it must have de-registered
3837 // interest during the thread callout. That also drops
3838 // the pending ack count.
3839
3840 if (fHeadNotePendingAcks && informee->timer) {
3841 fHeadNotePendingAcks--;
3842 }
3843
3844 informee->timer = 0;
3845 } else if (informee->timer) {
3846 assert(informee->timer == -1);
3847
3848 // Driver has not acked, and has returned a positive result.
3849 // Enforce a minimum permissible timeout value.
3850 // Make the min value large enough so timeout is less likely
3851 // to occur if a driver misinterpreted that the return value
3852 // should be in microsecond units. And make it large enough
3853 // to be noticeable if a driver neglects to ack.
3854
3855 if (result < kMinAckTimeoutTicks) {
3856 result = kMinAckTimeoutTicks;
3857 }
3858
3859 informee->timer = (result / (ACK_TIMER_PERIOD / ns_per_us)) + 1;
3860 if (result > maxTimeout) {
3861 maxTimeout = result;
3862 }
3863 }
3864 // else, child has already acked or driver has removed interest,
3865 // and head_note_pendingAcks decremented.
3866 // informee may have been removed from the interested drivers list,
3867 // thus the informee must be retained across the callout.
3868
3869 informee->release();
3870 }
3871
3872 fDriverCallParamCount = 0;
3873
3874 if (fHeadNotePendingAcks) {
3875 OUR_PMLog(kPMLogStartAckTimer, 0, 0);
3876 start_ack_timer();
3877 getPMRootDomain()->reset_watchdog_timer(this, maxTimeout / USEC_PER_SEC + 1);
3878 }
3879 }
3880
3881 MS_POP(); // pop the machine state passed to notifyAll()
3882
3883 // If interest acks are outstanding, block the state machine until
3884 // fHeadNotePendingAcks drops to zero before notifying root domain.
3885 // Otherwise notify root domain directly.
3886
3887 if (!fHeadNotePendingAcks) {
3888 notifyRootDomain();
3889 } else {
3890 MS_PUSH(fMachineState);
3891 fMachineState = kIOPM_NotifyChildrenStart;
3892 }
3893 }
3894
3895 //*********************************************************************************
3896 // [private] notifyRootDomain
3897 //*********************************************************************************
3898
3899 void
notifyRootDomain(void)3900 IOService::notifyRootDomain( void )
3901 {
3902 assert( fDriverCallBusy == false );
3903
3904 // Only for root domain in the will-change phase.
3905 // On a power up, don't notify children right after the interested drivers.
3906 // Perform setPowerState() first, then notify the children.
3907 if (!IS_ROOT_DOMAIN || (fMachineState != kIOPM_OurChangeSetPowerState)) {
3908 notifyChildren();
3909 return;
3910 }
3911
3912 MS_PUSH(fMachineState); // push notifyAll() machine state
3913 fMachineState = kIOPM_DriverThreadCallDone;
3914
3915 // Call IOPMrootDomain::willNotifyPowerChildren() on a thread call
3916 // to avoid a deadlock.
3917 fDriverCallReason = kRootDomainInformPreChange;
3918 fDriverCallBusy = true;
3919 thread_call_enter( fDriverCallEntry );
3920 }
3921
3922 void
notifyRootDomainDone(void)3923 IOService::notifyRootDomainDone( void )
3924 {
3925 assert( fDriverCallBusy == false );
3926 assert( fMachineState == kIOPM_DriverThreadCallDone );
3927
3928 if (IS_ROOT_DOMAIN) {
3929 // Reset in case watchdog was adjusted for hibernation
3930 reset_watchdog_timer();
3931 }
3932
3933 MS_POP(); // pop notifyAll() machine state
3934 notifyChildren();
3935 }
3936
3937 //*********************************************************************************
3938 // [private] notifyChildren
3939 //*********************************************************************************
3940
3941 void
notifyChildren(void)3942 IOService::notifyChildren( void )
3943 {
3944 OSIterator * iter;
3945 OSObject * next;
3946 IOPowerConnection * connection;
3947 OSArray * children = NULL;
3948 IOPMrootDomain * rootDomain;
3949 bool delayNotify = false;
3950
3951 if ((fHeadNotePowerState != fCurrentPowerState) &&
3952 (IS_POWER_DROP == fIsPreChange) &&
3953 ((rootDomain = getPMRootDomain()) == this)) {
3954 rootDomain->tracePoint( IS_POWER_DROP ?
3955 kIOPMTracePointSleepPowerPlaneDrivers :
3956 kIOPMTracePointWakePowerPlaneDrivers );
3957 }
3958
3959 if (fStrictTreeOrder) {
3960 children = OSArray::withCapacity(8);
3961 }
3962
3963 // Sum child power consumption in notifyChild()
3964 fHeadNotePowerArrayEntry->staticPower = 0;
3965
3966 iter = getChildIterator(gIOPowerPlane);
3967 if (iter) {
3968 while ((next = iter->getNextObject())) {
3969 if ((connection = OSDynamicCast(IOPowerConnection, next))) {
3970 if (connection->getReadyFlag() == false) {
3971 PM_LOG3("[%s] %s: connection not ready\n",
3972 getName(), __FUNCTION__);
3973 continue;
3974 }
3975
3976 // Mechanism to postpone the did-change notification to
3977 // certain power children to order those children last.
3978 // Cannot be used together with strict tree ordering.
3979
3980 if (!fIsPreChange &&
3981 connection->delayChildNotification &&
3982 getPMRootDomain()->shouldDelayChildNotification(this)) {
3983 if (!children) {
3984 children = OSArray::withCapacity(8);
3985 if (children) {
3986 delayNotify = true;
3987 }
3988 }
3989 if (delayNotify) {
3990 children->setObject( connection );
3991 continue;
3992 }
3993 }
3994
3995 if (!delayNotify && children) {
3996 children->setObject( connection );
3997 } else {
3998 notifyChild( connection );
3999 }
4000 }
4001 }
4002 iter->release();
4003 }
4004
4005 if (children && (children->getCount() == 0)) {
4006 children->release();
4007 children = NULL;
4008 }
4009 if (children) {
4010 assert(fNotifyChildArray == NULL);
4011 fNotifyChildArray = children;
4012 MS_PUSH(fMachineState);
4013
4014 if (delayNotify) {
4015 // Block until all non-delayed children have acked their
4016 // notification. Then notify the remaining delayed child
4017 // in the array. This is used to hold off graphics child
4018 // notification while the rest of the system powers up.
4019 // If a hid tickle arrives during this time, the delayed
4020 // children are immediately notified and root domain will
4021 // not clamp power for dark wake.
4022
4023 fMachineState = kIOPM_NotifyChildrenDelayed;
4024 PM_LOG2("%s: %d children in delayed array\n",
4025 getName(), children->getCount());
4026 } else {
4027 // Child array created to support strict notification order.
4028 // Notify children in the array one at a time.
4029
4030 fMachineState = kIOPM_NotifyChildrenOrdered;
4031 }
4032 }
4033 }
4034
4035 //*********************************************************************************
4036 // [private] notifyChildrenOrdered
4037 //*********************************************************************************
4038
4039 void
notifyChildrenOrdered(void)4040 IOService::notifyChildrenOrdered( void )
4041 {
4042 PM_ASSERT_IN_GATE();
4043 assert(fNotifyChildArray);
4044 assert(fMachineState == kIOPM_NotifyChildrenOrdered);
4045
4046 // Notify one child, wait for it to ack, then repeat for next child.
4047 // This is a workaround for some drivers with multiple instances at
4048 // the same branch in the power tree, but the driver is slow to power
4049 // up unless the tree ordering is observed. Problem observed only on
4050 // system wake, not on system sleep.
4051 //
4052 // We have the ability to power off in reverse child index order.
4053 // That works nicely on some machines, but not on all HW configs.
4054
4055 if (fNotifyChildArray->getCount()) {
4056 IOPowerConnection * connection;
4057 connection = (IOPowerConnection *) fNotifyChildArray->getObject(0);
4058 notifyChild( connection );
4059 fNotifyChildArray->removeObject(0);
4060 } else {
4061 fNotifyChildArray->release();
4062 fNotifyChildArray = NULL;
4063
4064 MS_POP(); // pushed by notifyChildren()
4065 }
4066 }
4067
4068 //*********************************************************************************
4069 // [private] notifyChildrenDelayed
4070 //*********************************************************************************
4071
4072 void
notifyChildrenDelayed(void)4073 IOService::notifyChildrenDelayed( void )
4074 {
4075 IOPowerConnection * connection;
4076
4077 PM_ASSERT_IN_GATE();
4078 assert(fNotifyChildArray);
4079 assert(fMachineState == kIOPM_NotifyChildrenDelayed);
4080
4081 // Wait after all non-delayed children and interested drivers have ack'ed,
4082 // then notify all delayed children. If notify delay is canceled, child
4083 // acks may be outstanding with PM blocked on fHeadNotePendingAcks != 0.
4084 // But the handling for either case is identical.
4085
4086 for (int i = 0;; i++) {
4087 connection = (IOPowerConnection *) fNotifyChildArray->getObject(i);
4088 if (!connection) {
4089 break;
4090 }
4091
4092 notifyChild( connection );
4093 }
4094
4095 PM_LOG2("%s: notified delayed children\n", getName());
4096 fNotifyChildArray->release();
4097 fNotifyChildArray = NULL;
4098
4099 MS_POP(); // pushed by notifyChildren()
4100 }
4101
4102 //*********************************************************************************
4103 // [private] notifyAll
4104 //*********************************************************************************
4105
4106 IOReturn
notifyAll(uint32_t nextMS)4107 IOService::notifyAll( uint32_t nextMS )
4108 {
4109 // Save the machine state to be restored by notifyInterestedDriversDone()
4110
4111 PM_ASSERT_IN_GATE();
4112 MS_PUSH(nextMS);
4113 fMachineState = kIOPM_DriverThreadCallDone;
4114 fDriverCallReason = fIsPreChange ?
4115 kDriverCallInformPreChange : kDriverCallInformPostChange;
4116
4117 if (!notifyInterestedDrivers()) {
4118 notifyInterestedDriversDone();
4119 }
4120
4121 return IOPMWillAckLater;
4122 }
4123
4124 //*********************************************************************************
4125 // [private, static] pmDriverCallout
4126 //
4127 // Thread call context
4128 //*********************************************************************************
4129
4130 IOReturn
actionDriverCalloutDone(OSObject * target,void * arg0,void * arg1,void * arg2,void * arg3)4131 IOService::actionDriverCalloutDone(
4132 OSObject * target,
4133 void * arg0, void * arg1,
4134 void * arg2, void * arg3 )
4135 {
4136 IOServicePM * pwrMgt = (IOServicePM *) arg0;
4137
4138 assert( fDriverCallBusy );
4139 fDriverCallBusy = false;
4140
4141 assert(gIOPMWorkQueue);
4142 gIOPMWorkQueue->signalWorkAvailable();
4143
4144 return kIOReturnSuccess;
4145 }
4146
4147 void
pmDriverCallout(IOService * from,__unused thread_call_param_t p)4148 IOService::pmDriverCallout( IOService * from,
4149 __unused thread_call_param_t p)
4150 {
4151 assert(from);
4152 from->startDriverCalloutTimer();
4153 switch (from->fDriverCallReason) {
4154 case kDriverCallSetPowerState:
4155 from->driverSetPowerState();
4156 break;
4157
4158 case kDriverCallInformPreChange:
4159 case kDriverCallInformPostChange:
4160 from->driverInformPowerChange();
4161 break;
4162
4163 case kRootDomainInformPreChange:
4164 getPMRootDomain()->willNotifyPowerChildren(from->fHeadNotePowerState);
4165 break;
4166
4167 default:
4168 panic("IOService::pmDriverCallout bad machine state %x",
4169 from->fDriverCallReason);
4170 }
4171 from->stopDriverCalloutTimer();
4172
4173 gIOPMWorkLoop->runAction(actionDriverCalloutDone,
4174 /* target */ from,
4175 /* arg0 */ (void *) from->pwrMgt );
4176 }
4177
4178 //*********************************************************************************
4179 // [private] driverSetPowerState
4180 //
4181 // Thread call context
4182 //*********************************************************************************
4183
4184 void
driverSetPowerState(void)4185 IOService::driverSetPowerState( void )
4186 {
4187 IOPMPowerStateIndex powerState;
4188 DriverCallParam * param;
4189 IOPMDriverCallEntry callEntry;
4190 AbsoluteTime end;
4191 IOReturn result;
4192 uint32_t oldPowerState = getPowerState();
4193 const OSMetaClass *controllingDriverMetaClass = NULL;
4194 uint32_t controllingDriverRegistryEntryID = 0;
4195
4196 assert( fDriverCallBusy );
4197 assert( fDriverCallParamPtr );
4198 assert( fDriverCallParamCount == 1 );
4199
4200 param = (DriverCallParam *) fDriverCallParamPtr;
4201 powerState = fHeadNotePowerState;
4202 if (fControllingDriver) {
4203 controllingDriverMetaClass = fControllingDriver->getMetaClass();
4204 controllingDriverRegistryEntryID = (uint32_t)fControllingDriver->getRegistryEntryID();
4205 }
4206
4207 if (assertPMDriverCall(&callEntry, kIOPMDriverCallMethodSetPowerState)) {
4208 SOCD_TRACE_XNU_START(PM_SET_POWER_STATE,
4209 ADDR(controllingDriverMetaClass),
4210 ADDR(this->getMetaClass()),
4211 PACK_2X32(VALUE(this->getRegistryEntryID()), VALUE(controllingDriverRegistryEntryID)),
4212 PACK_2X32(VALUE(powerState), VALUE(oldPowerState)));
4213
4214 OUR_PMLogFuncStart(kPMLogProgramHardware, (uintptr_t) this, powerState);
4215 clock_get_uptime(&fDriverCallStartTime);
4216
4217 if (reserved && reserved->uvars && reserved->uvars->userServer) {
4218 result = reserved->uvars->userServer->serviceSetPowerState(fControllingDriver, this, fHeadNotePowerArrayEntry->capabilityFlags, powerState);
4219 } else {
4220 result = fControllingDriver->setPowerState( powerState, this );
4221 }
4222 clock_get_uptime(&end);
4223 OUR_PMLogFuncEnd(kPMLogProgramHardware, (uintptr_t) this, (UInt32) result);
4224 SOCD_TRACE_XNU_END(PM_SET_POWER_STATE,
4225 ADDR(controllingDriverMetaClass),
4226 ADDR(this->getMetaClass()),
4227 PACK_2X32(VALUE(this->getRegistryEntryID()), VALUE(controllingDriverRegistryEntryID)),
4228 PACK_2X32(VALUE(powerState), VALUE(result)));
4229
4230 deassertPMDriverCall(&callEntry);
4231
4232 // Record the most recent max power state residency timings.
4233 // Use with DeviceActiveTimestamp to diagnose tickle issues.
4234 if (powerState == fHighestPowerState) {
4235 fMaxPowerStateEntryTime = end;
4236 } else if (oldPowerState == fHighestPowerState) {
4237 fMaxPowerStateExitTime = end;
4238 }
4239
4240 if (result < 0) {
4241 PM_LOG("%s::setPowerState(%p, %lu -> %lu) returned 0x%x\n",
4242 fName, OBFUSCATE(this), fCurrentPowerState, powerState, result);
4243 }
4244
4245
4246 if ((result == IOPMAckImplied) || (result < 0)) {
4247 uint64_t nsec;
4248
4249 SUB_ABSOLUTETIME(&end, &fDriverCallStartTime);
4250 absolutetime_to_nanoseconds(end, &nsec);
4251 if (nsec > gIOPMSetPowerStateLogNS) {
4252 getPMRootDomain()->pmStatsRecordApplicationResponse(
4253 gIOPMStatsDriverPSChangeSlow,
4254 fName, kDriverCallSetPowerState, NS_TO_MS(nsec), getRegistryEntryID(),
4255 NULL, powerState);
4256 }
4257 }
4258 } else {
4259 result = kIOPMAckImplied;
4260 }
4261
4262 param->Result = result;
4263 }
4264
4265 //*********************************************************************************
4266 // [private] driverInformPowerChange
4267 //
4268 // Thread call context
4269 //*********************************************************************************
4270
4271 void
driverInformPowerChange(void)4272 IOService::driverInformPowerChange( void )
4273 {
4274 IOPMinformee * informee;
4275 IOService * driver;
4276 DriverCallParam * param;
4277 IOPMDriverCallEntry callEntry;
4278 IOPMPowerFlags powerFlags;
4279 IOPMPowerStateIndex powerState;
4280 AbsoluteTime end;
4281 IOReturn result;
4282 IOItemCount count;
4283 IOOptionBits callMethod = (fDriverCallReason == kDriverCallInformPreChange) ?
4284 kIOPMDriverCallMethodWillChange : kIOPMDriverCallMethodDidChange;
4285
4286 assert( fDriverCallBusy );
4287 assert( fDriverCallParamPtr );
4288 assert( fDriverCallParamCount );
4289
4290 param = (DriverCallParam *) fDriverCallParamPtr;
4291 count = fDriverCallParamCount;
4292
4293 powerFlags = fHeadNotePowerArrayEntry->capabilityFlags;
4294 powerState = fHeadNotePowerState;
4295
4296 for (IOItemCount i = 0; i < count; i++) {
4297 informee = (IOPMinformee *) param->Target;
4298 driver = informee->whatObject;
4299
4300 if (assertPMDriverCall(&callEntry, callMethod, informee)) {
4301 SOCD_TRACE_XNU_START(PM_INFORM_POWER_CHANGE,
4302 ADDR(driver->getMetaClass()),
4303 ADDR(this->getMetaClass()),
4304 PACK_2X32(VALUE(this->getRegistryEntryID()), VALUE(driver->getRegistryEntryID())),
4305 PACK_2X32(VALUE(powerState), VALUE(fDriverCallReason)));
4306
4307 if (fDriverCallReason == kDriverCallInformPreChange) {
4308 OUR_PMLogFuncStart(kPMLogInformDriverPreChange, (uintptr_t) this, powerState);
4309 clock_get_uptime(&informee->startTime);
4310 result = driver->powerStateWillChangeTo(powerFlags, powerState, this);
4311 clock_get_uptime(&end);
4312 OUR_PMLogFuncEnd(kPMLogInformDriverPreChange, (uintptr_t) this, result);
4313 } else {
4314 OUR_PMLogFuncStart(kPMLogInformDriverPostChange, (uintptr_t) this, powerState);
4315 clock_get_uptime(&informee->startTime);
4316 result = driver->powerStateDidChangeTo(powerFlags, powerState, this);
4317 clock_get_uptime(&end);
4318 OUR_PMLogFuncEnd(kPMLogInformDriverPostChange, (uintptr_t) this, result);
4319 }
4320
4321 SOCD_TRACE_XNU_END(PM_INFORM_POWER_CHANGE,
4322 ADDR(driver->getMetaClass()),
4323 ADDR(this->getMetaClass()),
4324 PACK_2X32(VALUE(this->getRegistryEntryID()), VALUE(driver->getRegistryEntryID())),
4325 PACK_2X32(VALUE(result), VALUE(fDriverCallReason)));
4326
4327 deassertPMDriverCall(&callEntry);
4328
4329
4330 if ((result == IOPMAckImplied) || (result < 0)) {
4331 uint64_t nsec;
4332
4333 SUB_ABSOLUTETIME(&end, &informee->startTime);
4334 absolutetime_to_nanoseconds(end, &nsec);
4335 if (nsec > gIOPMSetPowerStateLogNS) {
4336 getPMRootDomain()->pmStatsRecordApplicationResponse(
4337 gIOPMStatsDriverPSChangeSlow, driver->getName(),
4338 fDriverCallReason, NS_TO_MS(nsec), driver->getRegistryEntryID(),
4339 NULL, powerState);
4340 }
4341 }
4342 } else {
4343 result = kIOPMAckImplied;
4344 }
4345
4346 param->Result = result;
4347 param++;
4348 }
4349 }
4350
4351 //*********************************************************************************
4352 // [private, static] pmDriverCalloutTimer
4353 //
4354 // Thread call context.
4355 //*********************************************************************************
4356
4357 void
startDriverCalloutTimer(void)4358 IOService::startDriverCalloutTimer( void )
4359 {
4360 AbsoluteTime deadline;
4361 boolean_t pending;
4362
4363 clock_interval_to_deadline(gDriverCalloutTimer, kMillisecondScale, &deadline);
4364
4365 retain();
4366 pending = thread_call_enter_delayed(fDriverCallTimer, deadline);
4367 if (pending) {
4368 release();
4369 }
4370 }
4371
4372 void
stopDriverCalloutTimer(void)4373 IOService::stopDriverCalloutTimer( void )
4374 {
4375 boolean_t pending;
4376
4377 pending = thread_call_cancel(fDriverCallTimer);
4378 if (pending) {
4379 release();
4380 }
4381 }
4382
4383 void
pmDriverCalloutTimer(thread_call_param_t arg0,__unused thread_call_param_t arg1)4384 IOService::pmDriverCalloutTimer( thread_call_param_t arg0,
4385 __unused thread_call_param_t arg1)
4386 {
4387 assert(arg0);
4388 IOService *from = (IOService *) arg0;
4389 PM_LOG("PM waiting on pmDriverCallout(0x%x) to %s (%u ms)\n", from->fDriverCallReason, from->fName, gDriverCalloutTimer);
4390 from->release();
4391 }
4392
4393 //*********************************************************************************
4394 // [private] notifyChild
4395 //
4396 // Notify a power domain child of an upcoming power change.
4397 // If the object acknowledges the current change, we return TRUE.
4398 //*********************************************************************************
4399
4400 bool
notifyChild(IOPowerConnection * theNub)4401 IOService::notifyChild( IOPowerConnection * theNub )
4402 {
4403 IOReturn ret = IOPMAckImplied;
4404 unsigned long childPower;
4405 IOService * theChild;
4406 IOPMRequest * childRequest;
4407 IOPMPowerChangeFlags requestArg2;
4408 int requestType;
4409
4410 PM_ASSERT_IN_GATE();
4411 theChild = (IOService *)(theNub->copyChildEntry(gIOPowerPlane));
4412 if (!theChild) {
4413 return true;
4414 }
4415
4416 // Unless the child handles the notification immediately and returns
4417 // kIOPMAckImplied, we'll be awaiting their acknowledgement later.
4418 fHeadNotePendingAcks++;
4419 theNub->setAwaitingAck(true);
4420
4421 requestArg2 = fHeadNoteChangeFlags;
4422 if (StateOrder(fHeadNotePowerState) < StateOrder(fCurrentPowerState)) {
4423 requestArg2 |= kIOPMDomainPowerDrop;
4424 }
4425
4426 requestType = fIsPreChange ?
4427 kIOPMRequestTypePowerDomainWillChange :
4428 kIOPMRequestTypePowerDomainDidChange;
4429
4430 childRequest = acquirePMRequest( theChild, requestType );
4431 if (childRequest) {
4432 theNub->retain();
4433 childRequest->fArg0 = (void *) fHeadNotePowerArrayEntry->outputPowerFlags;
4434 childRequest->fArg1 = (void *) theNub;
4435 childRequest->fArg2 = (void *)(uintptr_t) requestArg2;
4436 theChild->submitPMRequest( childRequest );
4437 ret = IOPMWillAckLater;
4438 } else {
4439 ret = IOPMAckImplied;
4440 fHeadNotePendingAcks--;
4441 theNub->setAwaitingAck(false);
4442 childPower = theChild->currentPowerConsumption();
4443 if (childPower == kIOPMUnknown) {
4444 fHeadNotePowerArrayEntry->staticPower = kIOPMUnknown;
4445 } else {
4446 if (fHeadNotePowerArrayEntry->staticPower != kIOPMUnknown) {
4447 fHeadNotePowerArrayEntry->staticPower += childPower;
4448 }
4449 }
4450 }
4451
4452 theChild->release();
4453 return IOPMAckImplied == ret;
4454 }
4455
4456 //*********************************************************************************
4457 // [private] notifyControllingDriver
4458 //*********************************************************************************
4459
4460 bool
notifyControllingDriver(void)4461 IOService::notifyControllingDriver( void )
4462 {
4463 DriverCallParam * param;
4464
4465 PM_ASSERT_IN_GATE();
4466 assert( fDriverCallParamCount == 0 );
4467 assert( fControllingDriver );
4468
4469 if (fInitialSetPowerState) {
4470 fInitialSetPowerState = false;
4471 fHeadNoteChangeFlags |= kIOPMInitialPowerChange;
4472
4473 // Driver specified flag to skip the inital setPowerState()
4474 if (fHeadNotePowerArrayEntry->capabilityFlags & kIOPMInitialDeviceState) {
4475 return false;
4476 }
4477 }
4478
4479 param = (DriverCallParam *) fDriverCallParamPtr;
4480 if (!param) {
4481 param = IONew(DriverCallParam, 1);
4482 if (!param) {
4483 return false; // no memory
4484 }
4485 fDriverCallParamPtr = (void *) param;
4486 fDriverCallParamSlots = 1;
4487 }
4488
4489 param->Target = fControllingDriver;
4490 fDriverCallParamCount = 1;
4491 fDriverTimer = -1;
4492
4493 // Block state machine and wait for callout completion.
4494 assert(!fDriverCallBusy);
4495 fDriverCallBusy = true;
4496 thread_call_enter( fDriverCallEntry );
4497
4498 return true;
4499 }
4500
4501 //*********************************************************************************
4502 // [private] notifyControllingDriverDone
4503 //*********************************************************************************
4504
4505 void
notifyControllingDriverDone(void)4506 IOService::notifyControllingDriverDone( void )
4507 {
4508 DriverCallParam * param;
4509 IOReturn result;
4510
4511 PM_ASSERT_IN_GATE();
4512 param = (DriverCallParam *) fDriverCallParamPtr;
4513
4514 assert( fDriverCallBusy == false );
4515 assert( fMachineState == kIOPM_DriverThreadCallDone );
4516
4517 if (param && fDriverCallParamCount) {
4518 assert(fDriverCallParamCount == 1);
4519
4520 // the return value from setPowerState()
4521 result = param->Result;
4522
4523 if ((result == IOPMAckImplied) || (result < 0)) {
4524 fDriverTimer = 0;
4525 } else if (fDriverTimer) {
4526 assert(fDriverTimer == -1);
4527
4528 // Driver has not acked, and has returned a positive result.
4529 // Enforce a minimum permissible timeout value.
4530 // Make the min value large enough so timeout is less likely
4531 // to occur if a driver misinterpreted that the return value
4532 // should be in microsecond units. And make it large enough
4533 // to be noticeable if a driver neglects to ack.
4534
4535 if (result < kMinAckTimeoutTicks) {
4536 result = kMinAckTimeoutTicks;
4537 }
4538
4539 fDriverTimer = (result / (ACK_TIMER_PERIOD / ns_per_us)) + 1;
4540 }
4541 // else, child has already acked and driver_timer reset to 0.
4542
4543 fDriverCallParamCount = 0;
4544
4545 if (fDriverTimer) {
4546 OUR_PMLog(kPMLogStartAckTimer, 0, 0);
4547 start_ack_timer();
4548 getPMRootDomain()->reset_watchdog_timer(this, result / USEC_PER_SEC + 1);
4549 }
4550 }
4551
4552 MS_POP(); // pushed by OurChangeSetPowerState()
4553 fIsPreChange = false;
4554 }
4555
4556 //*********************************************************************************
4557 // [private] all_done
4558 //
4559 // A power change is done.
4560 //*********************************************************************************
4561
4562 void
all_done(void)4563 IOService::all_done( void )
4564 {
4565 IOPMPowerStateIndex prevPowerState;
4566 const IOPMPSEntry * powerStatePtr;
4567 IOPMDriverCallEntry callEntry;
4568 uint32_t prevMachineState = fMachineState;
4569 bool actionCalled = false;
4570 uint64_t ts;
4571
4572 fMachineState = kIOPM_Finished;
4573
4574 if ((fHeadNoteChangeFlags & kIOPMSynchronize) &&
4575 ((prevMachineState == kIOPM_Finished) ||
4576 (prevMachineState == kIOPM_SyncFinish))) {
4577 // Sync operation and no power change occurred.
4578 // Do not inform driver and clients about this request completion,
4579 // except for the originator (root domain).
4580
4581 PM_ACTION_CHANGE(actionPowerChangeDone,
4582 fHeadNotePowerState, fHeadNoteChangeFlags);
4583
4584 if (getPMRequestType() == kIOPMRequestTypeSynchronizePowerTree) {
4585 powerChangeDone(fCurrentPowerState);
4586 } else if (fAdvisoryTickleUsed) {
4587 // Not root domain and advisory tickle target.
4588 // Re-adjust power after power tree sync at the 'did' pass
4589 // to recompute desire and adjust power state between dark
4590 // and full wake transitions. Root domain is responsible
4591 // for calling setAdvisoryTickleEnable() before starting
4592 // the kIOPMSynchronize power change.
4593
4594 if (!fAdjustPowerScheduled &&
4595 (fHeadNoteChangeFlags & kIOPMDomainDidChange)) {
4596 IOPMRequest * request;
4597 request = acquirePMRequest( this, kIOPMRequestTypeAdjustPowerState );
4598 if (request) {
4599 submitPMRequest( request );
4600 fAdjustPowerScheduled = true;
4601 }
4602 }
4603 }
4604
4605 return;
4606 }
4607
4608 // our power change
4609 if (fHeadNoteChangeFlags & kIOPMSelfInitiated) {
4610 // power state changed
4611 if ((fHeadNoteChangeFlags & kIOPMNotDone) == 0) {
4612 trackSystemSleepPreventers(
4613 fCurrentPowerState, fHeadNotePowerState, fHeadNoteChangeFlags);
4614
4615 // we changed, tell our parent
4616 requestDomainPower(fHeadNotePowerState);
4617
4618 // yes, did power raise?
4619 if (StateOrder(fCurrentPowerState) < StateOrder(fHeadNotePowerState)) {
4620 // yes, inform clients and apps
4621 tellChangeUp(fHeadNotePowerState);
4622 }
4623 prevPowerState = fCurrentPowerState;
4624 // either way
4625 fCurrentPowerState = fHeadNotePowerState;
4626 PM_LOCK();
4627 if (fReportBuf) {
4628 ts = mach_absolute_time();
4629 STATEREPORT_SETSTATE(fReportBuf, (uint16_t) fCurrentPowerState, ts);
4630 }
4631 PM_UNLOCK();
4632 #if PM_VARS_SUPPORT
4633 fPMVars->myCurrentState = fCurrentPowerState;
4634 #endif
4635 OUR_PMLog(kPMLogChangeDone, fCurrentPowerState, prevPowerState);
4636 PM_ACTION_CHANGE(actionPowerChangeDone,
4637 prevPowerState, fHeadNoteChangeFlags);
4638 actionCalled = true;
4639
4640 powerStatePtr = &fPowerStates[fCurrentPowerState];
4641 fCurrentCapabilityFlags = powerStatePtr->capabilityFlags;
4642 if (fCurrentCapabilityFlags & kIOPMStaticPowerValid) {
4643 fCurrentPowerConsumption = powerStatePtr->staticPower;
4644 }
4645
4646 if (fHeadNoteChangeFlags & kIOPMRootChangeDown) {
4647 // Bump tickle generation count once the entire tree is down
4648 gIOPMTickleGeneration++;
4649 }
4650
4651 // inform subclass policy-maker
4652 if (fPCDFunctionOverride && fParentsKnowState &&
4653 assertPMDriverCall(&callEntry, kIOPMDriverCallMethodChangeDone, NULL, kIOPMDriverCallNoInactiveCheck)) {
4654 powerChangeDone(prevPowerState);
4655 deassertPMDriverCall(&callEntry);
4656 }
4657 } else if (getPMRequestType() == kIOPMRequestTypeRequestPowerStateOverride) {
4658 // changePowerStateWithOverrideTo() was cancelled
4659 fOverrideMaxPowerState = kIOPMPowerStateMax;
4660 }
4661 }
4662
4663 // parent-initiated power change
4664 if (fHeadNoteChangeFlags & kIOPMParentInitiated) {
4665 if (fHeadNoteChangeFlags & kIOPMRootChangeDown) {
4666 ParentChangeRootChangeDown();
4667 }
4668
4669 // power state changed
4670 if ((fHeadNoteChangeFlags & kIOPMNotDone) == 0) {
4671 trackSystemSleepPreventers(
4672 fCurrentPowerState, fHeadNotePowerState, fHeadNoteChangeFlags);
4673
4674 // did power raise?
4675 if (StateOrder(fCurrentPowerState) < StateOrder(fHeadNotePowerState)) {
4676 // yes, inform clients and apps
4677 tellChangeUp(fHeadNotePowerState);
4678 }
4679 // either way
4680 prevPowerState = fCurrentPowerState;
4681 fCurrentPowerState = fHeadNotePowerState;
4682 PM_LOCK();
4683 if (fReportBuf) {
4684 ts = mach_absolute_time();
4685 STATEREPORT_SETSTATE(fReportBuf, (uint16_t) fCurrentPowerState, ts);
4686 }
4687 PM_UNLOCK();
4688 #if PM_VARS_SUPPORT
4689 fPMVars->myCurrentState = fCurrentPowerState;
4690 #endif
4691
4692 OUR_PMLog(kPMLogChangeDone, fCurrentPowerState, prevPowerState);
4693 PM_ACTION_CHANGE(actionPowerChangeDone,
4694 prevPowerState, fHeadNoteChangeFlags);
4695 actionCalled = true;
4696
4697 powerStatePtr = &fPowerStates[fCurrentPowerState];
4698 fCurrentCapabilityFlags = powerStatePtr->capabilityFlags;
4699 if (fCurrentCapabilityFlags & kIOPMStaticPowerValid) {
4700 fCurrentPowerConsumption = powerStatePtr->staticPower;
4701 }
4702
4703 // inform subclass policy-maker
4704 if (fPCDFunctionOverride && fParentsKnowState &&
4705 assertPMDriverCall(&callEntry, kIOPMDriverCallMethodChangeDone, NULL, kIOPMDriverCallNoInactiveCheck)) {
4706 powerChangeDone(prevPowerState);
4707 deassertPMDriverCall(&callEntry);
4708 }
4709 }
4710 }
4711
4712 // When power rises enough to satisfy the tickle's desire for more power,
4713 // the condition preventing idle-timer from dropping power is removed.
4714
4715 if (StateOrder(fCurrentPowerState) >= StateOrder(fIdleTimerMinPowerState)) {
4716 fIdleTimerMinPowerState = kPowerStateZero;
4717 }
4718
4719 if (!actionCalled) {
4720 PM_ACTION_CHANGE(actionPowerChangeDone,
4721 fHeadNotePowerState, fHeadNoteChangeFlags);
4722 }
4723 }
4724
4725 // MARK: -
4726 // MARK: Power Change Initiated by Driver
4727
4728 //*********************************************************************************
4729 // [private] OurChangeStart
4730 //
4731 // Begin the processing of a power change initiated by us.
4732 //*********************************************************************************
4733
4734 void
OurChangeStart(void)4735 IOService::OurChangeStart( void )
4736 {
4737 PM_ASSERT_IN_GATE();
4738 OUR_PMLog( kPMLogStartDeviceChange, fHeadNotePowerState, fCurrentPowerState );
4739
4740 // fMaxPowerState is our maximum possible power state based on the current
4741 // power state of our parents. If we are trying to raise power beyond the
4742 // maximum, send an async request for more power to all parents.
4743
4744 if (!IS_PM_ROOT && (StateOrder(fMaxPowerState) < StateOrder(fHeadNotePowerState))) {
4745 fHeadNoteChangeFlags |= kIOPMNotDone;
4746 requestDomainPower(fHeadNotePowerState);
4747 OurChangeFinish();
4748 return;
4749 }
4750
4751 // Redundant power changes skips to the end of the state machine.
4752
4753 if (!fInitialPowerChange && (fHeadNotePowerState == fCurrentPowerState)) {
4754 OurChangeFinish();
4755 return;
4756 }
4757 fInitialPowerChange = false;
4758
4759 // Change started, but may not complete...
4760 // Can be canceled (power drop) or deferred (power rise).
4761
4762 PM_ACTION_CHANGE(actionPowerChangeStart, fHeadNotePowerState, &fHeadNoteChangeFlags);
4763
4764 // Two separate paths, depending if power is being raised or lowered.
4765 // Lowering power is subject to approval by clients of this service.
4766
4767 if (IS_POWER_DROP) {
4768 fDoNotPowerDown = false;
4769
4770 // Ask for persmission to drop power state
4771 fMachineState = kIOPM_OurChangeTellClientsPowerDown;
4772 fOutOfBandParameter = kNotifyApps;
4773 askChangeDown(fHeadNotePowerState);
4774 } else {
4775 // This service is raising power and parents are able to support the
4776 // new power state. However a parent may have already committed to
4777 // drop power, which might force this object to temporarily drop power.
4778 // This results in "oscillations" before the state machines converge
4779 // to a steady state.
4780 //
4781 // To prevent this, a child must make a power reservation against all
4782 // parents before raising power. If the reservation fails, indicating
4783 // that the child will be unable to sustain the higher power state,
4784 // then the child will signal the parent to adjust power, and the child
4785 // will defer its power change.
4786
4787 IOReturn ret;
4788
4789 // Reserve parent power necessary to achieve fHeadNotePowerState.
4790 ret = requestDomainPower( fHeadNotePowerState, kReserveDomainPower );
4791 if (ret != kIOReturnSuccess) {
4792 // Reservation failed, defer power rise.
4793 fHeadNoteChangeFlags |= kIOPMNotDone;
4794 OurChangeFinish();
4795 return;
4796 }
4797
4798 OurChangeTellCapabilityWillChange();
4799 }
4800 }
4801
4802 //*********************************************************************************
4803 // [private] requestDomainPowerApplier
4804 //
4805 // Call requestPowerDomainState() on all power parents.
4806 //*********************************************************************************
4807
4808 struct IOPMRequestDomainPowerContext {
4809 IOService * child; // the requesting child
4810 IOPMPowerFlags requestPowerFlags;// power flags requested by child
4811 };
4812
4813 static void
requestDomainPowerApplier(IORegistryEntry * entry,void * inContext)4814 requestDomainPowerApplier(
4815 IORegistryEntry * entry,
4816 void * inContext )
4817 {
4818 IOPowerConnection * connection;
4819 IOService * parent;
4820 IOPMRequestDomainPowerContext * context;
4821
4822 if ((connection = OSDynamicCast(IOPowerConnection, entry)) == NULL) {
4823 return;
4824 }
4825 parent = (IOService *) connection->copyParentEntry(gIOPowerPlane);
4826 if (!parent) {
4827 return;
4828 }
4829
4830 assert(inContext);
4831 context = (IOPMRequestDomainPowerContext *) inContext;
4832
4833 if (connection->parentKnowsState() && connection->getReadyFlag()) {
4834 parent->requestPowerDomainState(
4835 context->requestPowerFlags,
4836 connection,
4837 IOPMLowestState);
4838 }
4839
4840 parent->release();
4841 }
4842
4843 //*********************************************************************************
4844 // [private] requestDomainPower
4845 //
4846 // Called by a power child to broadcast its desired power state to all parents.
4847 // If the child self-initiates a power change, it must call this function to
4848 // allow its parents to adjust power state.
4849 //*********************************************************************************
4850
4851 IOReturn
requestDomainPower(IOPMPowerStateIndex ourPowerState,IOOptionBits options)4852 IOService::requestDomainPower(
4853 IOPMPowerStateIndex ourPowerState,
4854 IOOptionBits options )
4855 {
4856 IOPMPowerFlags requestPowerFlags;
4857 IOPMPowerStateIndex maxPowerState;
4858 IOPMRequestDomainPowerContext context;
4859
4860 PM_ASSERT_IN_GATE();
4861 assert(ourPowerState < fNumberOfPowerStates);
4862 if (ourPowerState >= fNumberOfPowerStates) {
4863 return kIOReturnBadArgument;
4864 }
4865 if (IS_PM_ROOT) {
4866 return kIOReturnSuccess;
4867 }
4868
4869 // Fetch our input power flags for the requested power state.
4870 // Parent request is stated in terms of required power flags.
4871
4872 requestPowerFlags = fPowerStates[ourPowerState].inputPowerFlags;
4873
4874 // Disregard the "previous request" for power reservation.
4875
4876 if (((options & kReserveDomainPower) == 0) &&
4877 (fPreviousRequestPowerFlags == requestPowerFlags)) {
4878 // skip if domain already knows our requirements
4879 goto done;
4880 }
4881 fPreviousRequestPowerFlags = requestPowerFlags;
4882
4883 // The results will be collected by fHeadNoteDomainTargetFlags
4884 context.child = this;
4885 context.requestPowerFlags = requestPowerFlags;
4886 fHeadNoteDomainTargetFlags = 0;
4887 applyToParents(requestDomainPowerApplier, &context, gIOPowerPlane);
4888
4889 if (options & kReserveDomainPower) {
4890 maxPowerState = fControllingDriver->driverMaxCapabilityForDomainState(
4891 fHeadNoteDomainTargetFlags );
4892
4893 if (StateOrder(maxPowerState) < StateOrder(ourPowerState)) {
4894 PM_LOG1("%s: power desired %u:0x%x got %u:0x%x\n",
4895 getName(),
4896 (uint32_t) ourPowerState, (uint32_t) requestPowerFlags,
4897 (uint32_t) maxPowerState, (uint32_t) fHeadNoteDomainTargetFlags);
4898 return kIOReturnNoPower;
4899 }
4900 }
4901
4902 done:
4903 return kIOReturnSuccess;
4904 }
4905
4906 //*********************************************************************************
4907 // [private] OurSyncStart
4908 //*********************************************************************************
4909
4910 void
OurSyncStart(void)4911 IOService::OurSyncStart( void )
4912 {
4913 PM_ASSERT_IN_GATE();
4914
4915 if (fInitialPowerChange) {
4916 return;
4917 }
4918
4919 PM_ACTION_CHANGE(actionPowerChangeStart, fHeadNotePowerState, &fHeadNoteChangeFlags);
4920
4921 if (fHeadNoteChangeFlags & kIOPMNotDone) {
4922 OurChangeFinish();
4923 return;
4924 }
4925
4926 if (fHeadNoteChangeFlags & kIOPMSyncTellPowerDown) {
4927 fDoNotPowerDown = false;
4928
4929 // Ask for permission to drop power state
4930 fMachineState = kIOPM_SyncTellClientsPowerDown;
4931 fOutOfBandParameter = kNotifyApps;
4932 askChangeDown(fHeadNotePowerState);
4933 } else {
4934 // Only inform capability app and clients.
4935 tellSystemCapabilityChange( kIOPM_SyncNotifyWillChange );
4936 }
4937 }
4938
4939 //*********************************************************************************
4940 // [private] OurChangeTellClientsPowerDown
4941 //
4942 // All applications and kernel clients have acknowledged our permission to drop
4943 // power. Here we notify them that we will lower the power and wait for acks.
4944 //*********************************************************************************
4945
4946 void
OurChangeTellClientsPowerDown(void)4947 IOService::OurChangeTellClientsPowerDown( void )
4948 {
4949 if (!IS_ROOT_DOMAIN) {
4950 fMachineState = kIOPM_OurChangeTellPriorityClientsPowerDown;
4951 } else {
4952 fMachineState = kIOPM_OurChangeTellUserPMPolicyPowerDown;
4953 }
4954 tellChangeDown1(fHeadNotePowerState);
4955 }
4956
4957 //*********************************************************************************
4958 // [private] OurChangeTellUserPMPolicyPowerDown
4959 //
4960 // All applications and kernel clients have acknowledged our permission to drop
4961 // power. Here we notify power management policy in user-space and wait for acks
4962 // one last time before we lower power
4963 //*********************************************************************************
4964 void
OurChangeTellUserPMPolicyPowerDown(void)4965 IOService::OurChangeTellUserPMPolicyPowerDown( void )
4966 {
4967 fMachineState = kIOPM_OurChangeTellPriorityClientsPowerDown;
4968 fOutOfBandParameter = kNotifyApps;
4969
4970 tellClientsWithResponse(kIOPMMessageLastCallBeforeSleep);
4971 }
4972
4973 //*********************************************************************************
4974 // [private] OurChangeTellPriorityClientsPowerDown
4975 //
4976 // All applications and kernel clients have acknowledged our intention to drop
4977 // power. Here we notify "priority" clients that we are lowering power.
4978 //*********************************************************************************
4979
4980 void
OurChangeTellPriorityClientsPowerDown(void)4981 IOService::OurChangeTellPriorityClientsPowerDown( void )
4982 {
4983 fMachineState = kIOPM_OurChangeNotifyInterestedDriversWillChange;
4984 tellChangeDown2(fHeadNotePowerState);
4985 }
4986
4987 //*********************************************************************************
4988 // [private] OurChangeTellCapabilityWillChange
4989 //
4990 // Extra stage for root domain to notify apps and drivers about the
4991 // system capability change when raising power state.
4992 //*********************************************************************************
4993
4994 void
OurChangeTellCapabilityWillChange(void)4995 IOService::OurChangeTellCapabilityWillChange( void )
4996 {
4997 if (!IS_ROOT_DOMAIN) {
4998 return OurChangeNotifyInterestedDriversWillChange();
4999 }
5000
5001 tellSystemCapabilityChange( kIOPM_OurChangeNotifyInterestedDriversWillChange );
5002 }
5003
5004 //*********************************************************************************
5005 // [private] OurChangeNotifyInterestedDriversWillChange
5006 //
5007 // All applications and kernel clients have acknowledged our power state change.
5008 // Here we notify interested drivers pre-change.
5009 //*********************************************************************************
5010
5011 void
OurChangeNotifyInterestedDriversWillChange(void)5012 IOService::OurChangeNotifyInterestedDriversWillChange( void )
5013 {
5014 IOPMrootDomain * rootDomain;
5015 if ((rootDomain = getPMRootDomain()) == this) {
5016 if (IS_POWER_DROP) {
5017 rootDomain->tracePoint( kIOPMTracePointSleepWillChangeInterests );
5018 } else {
5019 rootDomain->tracePoint( kIOPMTracePointWakeWillChangeInterests );
5020 }
5021 }
5022
5023 notifyAll( kIOPM_OurChangeSetPowerState );
5024 }
5025
5026 //*********************************************************************************
5027 // [private] OurChangeSetPowerState
5028 //
5029 // Instruct our controlling driver to program the hardware for the power state
5030 // change. Wait for async completions.
5031 //*********************************************************************************
5032
5033 void
OurChangeSetPowerState(void)5034 IOService::OurChangeSetPowerState( void )
5035 {
5036 MS_PUSH( kIOPM_OurChangeWaitForPowerSettle );
5037 fMachineState = kIOPM_DriverThreadCallDone;
5038 fDriverCallReason = kDriverCallSetPowerState;
5039
5040 if (notifyControllingDriver() == false) {
5041 notifyControllingDriverDone();
5042 }
5043 }
5044
5045 //*********************************************************************************
5046 // [private] OurChangeWaitForPowerSettle
5047 //
5048 // Our controlling driver has completed the power state change we initiated.
5049 // Wait for the driver specified settle time to expire.
5050 //*********************************************************************************
5051
5052 void
OurChangeWaitForPowerSettle(void)5053 IOService::OurChangeWaitForPowerSettle( void )
5054 {
5055 fMachineState = kIOPM_OurChangeNotifyInterestedDriversDidChange;
5056 startSettleTimer();
5057 }
5058
5059 //*********************************************************************************
5060 // [private] OurChangeNotifyInterestedDriversDidChange
5061 //
5062 // Power has settled on a power change we initiated. Here we notify
5063 // all our interested drivers post-change.
5064 //*********************************************************************************
5065
5066 void
OurChangeNotifyInterestedDriversDidChange(void)5067 IOService::OurChangeNotifyInterestedDriversDidChange( void )
5068 {
5069 IOPMrootDomain * rootDomain;
5070 if ((rootDomain = getPMRootDomain()) == this) {
5071 rootDomain->tracePoint( IS_POWER_DROP ?
5072 kIOPMTracePointSleepDidChangeInterests :
5073 kIOPMTracePointWakeDidChangeInterests );
5074 }
5075
5076 notifyAll( kIOPM_OurChangeTellCapabilityDidChange );
5077 }
5078
5079 //*********************************************************************************
5080 // [private] OurChangeTellCapabilityDidChange
5081 //
5082 // For root domain to notify capability power-change.
5083 //*********************************************************************************
5084
5085 void
OurChangeTellCapabilityDidChange(void)5086 IOService::OurChangeTellCapabilityDidChange( void )
5087 {
5088 if (!IS_ROOT_DOMAIN) {
5089 return OurChangeFinish();
5090 }
5091
5092 if (!IS_POWER_DROP) {
5093 // Notify root domain immediately after notifying interested
5094 // drivers and power children.
5095 getPMRootDomain()->willTellSystemCapabilityDidChange();
5096 }
5097
5098 getPMRootDomain()->tracePoint( IS_POWER_DROP ?
5099 kIOPMTracePointSleepCapabilityClients :
5100 kIOPMTracePointWakeCapabilityClients );
5101
5102 tellSystemCapabilityChange( kIOPM_OurChangeFinish );
5103 }
5104
5105 //*********************************************************************************
5106 // [private] OurChangeFinish
5107 //
5108 // Done with this self-induced power state change.
5109 //*********************************************************************************
5110
5111 void
OurChangeFinish(void)5112 IOService::OurChangeFinish( void )
5113 {
5114 all_done();
5115 }
5116
5117 // MARK: -
5118 // MARK: Power Change Initiated by Parent
5119
5120 //*********************************************************************************
5121 // [private] ParentChangeStart
5122 //
5123 // Here we begin the processing of a power change initiated by our parent.
5124 //*********************************************************************************
5125
5126 IOReturn
ParentChangeStart(void)5127 IOService::ParentChangeStart( void )
5128 {
5129 PM_ASSERT_IN_GATE();
5130 OUR_PMLog( kPMLogStartParentChange, fHeadNotePowerState, fCurrentPowerState );
5131
5132 // Root power domain has transitioned to its max power state
5133 if ((fHeadNoteChangeFlags & (kIOPMDomainDidChange | kIOPMRootChangeUp)) ==
5134 (kIOPMDomainDidChange | kIOPMRootChangeUp)) {
5135 // Restart the idle timer stopped by ParentChangeRootChangeDown()
5136 if (fIdleTimerPeriod && fIdleTimerStopped) {
5137 restartIdleTimer();
5138 }
5139 }
5140
5141 // Power domain is forcing us to lower power
5142 if (StateOrder(fHeadNotePowerState) < StateOrder(fCurrentPowerState)) {
5143 PM_ACTION_CHANGE(actionPowerChangeStart, fHeadNotePowerState, &fHeadNoteChangeFlags);
5144
5145 // Tell apps and kernel clients
5146 fInitialPowerChange = false;
5147 fMachineState = kIOPM_ParentChangeTellPriorityClientsPowerDown;
5148 tellChangeDown1(fHeadNotePowerState);
5149 return IOPMWillAckLater;
5150 }
5151
5152 // Power domain is allowing us to raise power up to fHeadNotePowerState
5153 if (StateOrder(fHeadNotePowerState) > StateOrder(fCurrentPowerState)) {
5154 if (StateOrder(fDesiredPowerState) > StateOrder(fCurrentPowerState)) {
5155 if (StateOrder(fDesiredPowerState) < StateOrder(fHeadNotePowerState)) {
5156 // We power up, but not all the way
5157 fHeadNotePowerState = fDesiredPowerState;
5158 fHeadNotePowerArrayEntry = &fPowerStates[fDesiredPowerState];
5159 OUR_PMLog(kPMLogAmendParentChange, fHeadNotePowerState, 0);
5160 }
5161 } else {
5162 // We don't need to change
5163 fHeadNotePowerState = fCurrentPowerState;
5164 fHeadNotePowerArrayEntry = &fPowerStates[fCurrentPowerState];
5165 OUR_PMLog(kPMLogAmendParentChange, fHeadNotePowerState, 0);
5166 }
5167 }
5168
5169 if (fHeadNoteChangeFlags & kIOPMDomainDidChange) {
5170 if (StateOrder(fHeadNotePowerState) > StateOrder(fCurrentPowerState)) {
5171 PM_ACTION_CHANGE(actionPowerChangeStart,
5172 fHeadNotePowerState, &fHeadNoteChangeFlags);
5173
5174 // Parent did change up - start our change up
5175 fInitialPowerChange = false;
5176 ParentChangeTellCapabilityWillChange();
5177 return IOPMWillAckLater;
5178 } else if (fHeadNoteChangeFlags & kIOPMRootBroadcastFlags) {
5179 // No need to change power state, but broadcast change
5180 // to our children.
5181 fMachineState = kIOPM_SyncNotifyDidChange;
5182 fDriverCallReason = kDriverCallInformPreChange;
5183 fHeadNoteChangeFlags |= kIOPMNotDone;
5184 notifyChildren();
5185 return IOPMWillAckLater;
5186 }
5187 }
5188
5189 // No power state change necessary
5190 fHeadNoteChangeFlags |= kIOPMNotDone;
5191
5192 all_done();
5193 return IOPMAckImplied;
5194 }
5195
5196 //******************************************************************************
5197 // [private] ParentChangeRootChangeDown
5198 //
5199 // Root domain has finished the transition to the system sleep state. And all
5200 // drivers in the power plane should have powered down. Cancel the idle timer,
5201 // and also reset the device desire for those drivers that don't want power
5202 // automatically restored on wake.
5203 //******************************************************************************
5204
5205 void
ParentChangeRootChangeDown(void)5206 IOService::ParentChangeRootChangeDown( void )
5207 {
5208 // Always stop the idle timer before root power down
5209 if (fIdleTimerPeriod && !fIdleTimerStopped) {
5210 fIdleTimerStopped = true;
5211 if (fIdleTimer && thread_call_cancel(fIdleTimer)) {
5212 release();
5213 }
5214 }
5215
5216 if (fResetPowerStateOnWake) {
5217 // Reset device desire down to the lowest power state.
5218 // Advisory tickle desire is intentionally untouched since
5219 // it has no effect until system is promoted to full wake.
5220
5221 if (fDeviceDesire != kPowerStateZero) {
5222 updatePowerClient(gIOPMPowerClientDevice, kPowerStateZero);
5223 computeDesiredState(kPowerStateZero, true);
5224 requestDomainPower( fDesiredPowerState );
5225 PM_LOG1("%s: tickle desire removed\n", fName);
5226 }
5227
5228 // Invalidate tickle cache so the next tickle will issue a request
5229 IOLockLock(fActivityLock);
5230 fDeviceWasActive = false;
5231 fActivityTicklePowerState = kInvalidTicklePowerState;
5232 IOLockUnlock(fActivityLock);
5233
5234 fIdleTimerMinPowerState = kPowerStateZero;
5235 } else if (fAdvisoryTickleUsed) {
5236 // Less aggressive mechanism to accelerate idle timer expiration
5237 // before system sleep. May not always allow the driver to wake
5238 // up from system sleep in the min power state.
5239
5240 AbsoluteTime now;
5241 uint64_t nsec;
5242 bool dropTickleDesire = false;
5243
5244 if (fIdleTimerPeriod && !fIdleTimerIgnored &&
5245 (fIdleTimerMinPowerState == kPowerStateZero) &&
5246 (fDeviceDesire != kPowerStateZero)) {
5247 IOLockLock(fActivityLock);
5248
5249 if (!fDeviceWasActive) {
5250 // No tickles since the last idle timer expiration.
5251 // Safe to drop the device desire to zero.
5252 dropTickleDesire = true;
5253 } else {
5254 // Was tickled since the last idle timer expiration,
5255 // but not in the last minute.
5256 clock_get_uptime(&now);
5257 SUB_ABSOLUTETIME(&now, &fDeviceActiveTimestamp);
5258 absolutetime_to_nanoseconds(now, &nsec);
5259 if (nsec >= kNoTickleCancelWindow) {
5260 dropTickleDesire = true;
5261 }
5262 }
5263
5264 if (dropTickleDesire) {
5265 // Force the next tickle to raise power state
5266 fDeviceWasActive = false;
5267 fActivityTicklePowerState = kInvalidTicklePowerState;
5268 }
5269
5270 IOLockUnlock(fActivityLock);
5271 }
5272
5273 if (dropTickleDesire) {
5274 // Advisory tickle desire is intentionally untouched since
5275 // it has no effect until system is promoted to full wake.
5276
5277 updatePowerClient(gIOPMPowerClientDevice, kPowerStateZero);
5278 computeDesiredState(kPowerStateZero, true);
5279 PM_LOG1("%s: tickle desire dropped\n", fName);
5280 }
5281 }
5282 }
5283
5284 //*********************************************************************************
5285 // [private] ParentChangeTellPriorityClientsPowerDown
5286 //
5287 // All applications and kernel clients have acknowledged our intention to drop
5288 // power. Here we notify "priority" clients that we are lowering power.
5289 //*********************************************************************************
5290
5291 void
ParentChangeTellPriorityClientsPowerDown(void)5292 IOService::ParentChangeTellPriorityClientsPowerDown( void )
5293 {
5294 fMachineState = kIOPM_ParentChangeNotifyInterestedDriversWillChange;
5295 tellChangeDown2(fHeadNotePowerState);
5296 }
5297
5298 //*********************************************************************************
5299 // [private] ParentChangeTellCapabilityWillChange
5300 //
5301 // All (legacy) applications and kernel clients have acknowledged, extra stage for
5302 // root domain to notify apps and drivers about the system capability change.
5303 //*********************************************************************************
5304
5305 void
ParentChangeTellCapabilityWillChange(void)5306 IOService::ParentChangeTellCapabilityWillChange( void )
5307 {
5308 if (!IS_ROOT_DOMAIN) {
5309 return ParentChangeNotifyInterestedDriversWillChange();
5310 }
5311
5312 tellSystemCapabilityChange( kIOPM_ParentChangeNotifyInterestedDriversWillChange );
5313 }
5314
5315 //*********************************************************************************
5316 // [private] ParentChangeNotifyInterestedDriversWillChange
5317 //
5318 // All applications and kernel clients have acknowledged our power state change.
5319 // Here we notify interested drivers pre-change.
5320 //*********************************************************************************
5321
5322 void
ParentChangeNotifyInterestedDriversWillChange(void)5323 IOService::ParentChangeNotifyInterestedDriversWillChange( void )
5324 {
5325 notifyAll( kIOPM_ParentChangeSetPowerState );
5326 }
5327
5328 //*********************************************************************************
5329 // [private] ParentChangeSetPowerState
5330 //
5331 // Instruct our controlling driver to program the hardware for the power state
5332 // change. Wait for async completions.
5333 //*********************************************************************************
5334
5335 void
ParentChangeSetPowerState(void)5336 IOService::ParentChangeSetPowerState( void )
5337 {
5338 MS_PUSH( kIOPM_ParentChangeWaitForPowerSettle );
5339 fMachineState = kIOPM_DriverThreadCallDone;
5340 fDriverCallReason = kDriverCallSetPowerState;
5341
5342 if (notifyControllingDriver() == false) {
5343 notifyControllingDriverDone();
5344 }
5345 }
5346
5347 //*********************************************************************************
5348 // [private] ParentChangeWaitForPowerSettle
5349 //
5350 // Our controlling driver has completed the power state change initiated by our
5351 // parent. Wait for the driver specified settle time to expire.
5352 //*********************************************************************************
5353
5354 void
ParentChangeWaitForPowerSettle(void)5355 IOService::ParentChangeWaitForPowerSettle( void )
5356 {
5357 fMachineState = kIOPM_ParentChangeNotifyInterestedDriversDidChange;
5358 startSettleTimer();
5359 }
5360
5361 //*********************************************************************************
5362 // [private] ParentChangeNotifyInterestedDriversDidChange
5363 //
5364 // Power has settled on a power change initiated by our parent. Here we notify
5365 // all our interested drivers post-change.
5366 //*********************************************************************************
5367
5368 void
ParentChangeNotifyInterestedDriversDidChange(void)5369 IOService::ParentChangeNotifyInterestedDriversDidChange( void )
5370 {
5371 notifyAll( kIOPM_ParentChangeTellCapabilityDidChange );
5372 }
5373
5374 //*********************************************************************************
5375 // [private] ParentChangeTellCapabilityDidChange
5376 //
5377 // For root domain to notify capability power-change.
5378 //*********************************************************************************
5379
5380 void
ParentChangeTellCapabilityDidChange(void)5381 IOService::ParentChangeTellCapabilityDidChange( void )
5382 {
5383 if (!IS_ROOT_DOMAIN) {
5384 return ParentChangeAcknowledgePowerChange();
5385 }
5386
5387 tellSystemCapabilityChange( kIOPM_ParentChangeAcknowledgePowerChange );
5388 }
5389
5390 //*********************************************************************************
5391 // [private] ParentAcknowledgePowerChange
5392 //
5393 // Acknowledge our power parent that our power change is done.
5394 //*********************************************************************************
5395
5396 void
ParentChangeAcknowledgePowerChange(void)5397 IOService::ParentChangeAcknowledgePowerChange( void )
5398 {
5399 IORegistryEntry * nub;
5400 IOService * parent;
5401
5402 nub = fHeadNoteParentConnection;
5403 nub->retain();
5404 all_done();
5405 parent = (IOService *)nub->copyParentEntry(gIOPowerPlane);
5406 if (parent) {
5407 parent->acknowledgePowerChange((IOService *)nub);
5408 parent->release();
5409 }
5410 nub->release();
5411 }
5412
5413 // MARK: -
5414 // MARK: Ack and Settle timers
5415
5416 //*********************************************************************************
5417 // [private] settleTimerExpired
5418 //
5419 // Power has settled after our last change. Notify interested parties that
5420 // there is a new power state.
5421 //*********************************************************************************
5422
5423 void
settleTimerExpired(void)5424 IOService::settleTimerExpired( void )
5425 {
5426 #if USE_SETTLE_TIMER
5427 fSettleTimeUS = 0;
5428 gIOPMWorkQueue->signalWorkAvailable();
5429 #endif
5430 }
5431
5432 //*********************************************************************************
5433 // settle_timer_expired
5434 //
5435 // Holds a retain while the settle timer callout is in flight.
5436 //*********************************************************************************
5437
5438 #if USE_SETTLE_TIMER
5439 static void
settle_timer_expired(thread_call_param_t arg0,thread_call_param_t arg1)5440 settle_timer_expired( thread_call_param_t arg0, thread_call_param_t arg1 )
5441 {
5442 IOService * me = (IOService *) arg0;
5443
5444 if (gIOPMWorkLoop && gIOPMWorkQueue) {
5445 gIOPMWorkLoop->runAction(
5446 OSMemberFunctionCast(IOWorkLoop::Action, me, &IOService::settleTimerExpired),
5447 me);
5448 }
5449 me->release();
5450 }
5451 #endif
5452
5453 //*********************************************************************************
5454 // [private] startSettleTimer
5455 //
5456 // Calculate a power-settling delay in microseconds and start a timer.
5457 //*********************************************************************************
5458
5459 void
startSettleTimer(void)5460 IOService::startSettleTimer( void )
5461 {
5462 #if USE_SETTLE_TIMER
5463 // This function is broken and serves no useful purpose since it never
5464 // updates fSettleTimeUS to a non-zero value to stall the state machine,
5465 // yet it starts a delay timer. It appears no driver relies on a delay
5466 // from settleUpTime and settleDownTime in the power state table.
5467
5468 AbsoluteTime deadline;
5469 IOPMPowerStateIndex stateIndex;
5470 IOPMPowerStateIndex currentOrder, newOrder, i;
5471 uint32_t settleTime = 0;
5472 boolean_t pending;
5473
5474 PM_ASSERT_IN_GATE();
5475
5476 currentOrder = StateOrder(fCurrentPowerState);
5477 newOrder = StateOrder(fHeadNotePowerState);
5478
5479 i = currentOrder;
5480
5481 // lowering power
5482 if (newOrder < currentOrder) {
5483 while (i > newOrder) {
5484 stateIndex = fPowerStates[i].stateOrderToIndex;
5485 settleTime += (uint32_t) fPowerStates[stateIndex].settleDownTime;
5486 i--;
5487 }
5488 }
5489
5490 // raising power
5491 if (newOrder > currentOrder) {
5492 while (i < newOrder) {
5493 stateIndex = fPowerStates[i + 1].stateOrderToIndex;
5494 settleTime += (uint32_t) fPowerStates[stateIndex].settleUpTime;
5495 i++;
5496 }
5497 }
5498
5499 if (settleTime) {
5500 retain();
5501 clock_interval_to_deadline(settleTime, kMicrosecondScale, &deadline);
5502 pending = thread_call_enter_delayed(fSettleTimer, deadline);
5503 if (pending) {
5504 release();
5505 }
5506 }
5507 #endif
5508 }
5509
5510 //*********************************************************************************
5511 // [private] ackTimerTick
5512 //
5513 // The acknowledgement timeout periodic timer has ticked.
5514 // If we are awaiting acks for a power change notification,
5515 // we decrement the timer word of each interested driver which hasn't acked.
5516 // If a timer word becomes zero, we pretend the driver aknowledged.
5517 // If we are waiting for the controlling driver to change the power
5518 // state of the hardware, we decrement its timer word, and if it becomes
5519 // zero, we pretend the driver acknowledged.
5520 //
5521 // Returns true if the timer tick made it possible to advance to the next
5522 // machine state, false otherwise.
5523 //*********************************************************************************
5524
5525 #ifndef __LP64__
5526 #if MACH_ASSERT
5527 __dead2
5528 #endif
5529 void
ack_timer_ticked(void)5530 IOService::ack_timer_ticked( void )
5531 {
5532 assert(false);
5533 }
5534 #endif /* !__LP64__ */
5535
5536 bool
ackTimerTick(void)5537 IOService::ackTimerTick( void )
5538 {
5539 IOPMinformee * nextObject;
5540 bool done = false;
5541
5542 PM_ASSERT_IN_GATE();
5543 switch (fMachineState) {
5544 case kIOPM_OurChangeWaitForPowerSettle:
5545 case kIOPM_ParentChangeWaitForPowerSettle:
5546 // are we waiting for controlling driver to acknowledge?
5547 if (fDriverTimer > 0) {
5548 // yes, decrement timer tick
5549 fDriverTimer--;
5550 if (fDriverTimer == 0) {
5551 // controlling driver is tardy
5552 uint64_t nsec = computeTimeDeltaNS(&fDriverCallStartTime);
5553 OUR_PMLog(kPMLogCtrlDriverTardy, 0, 0);
5554 setProperty(kIOPMTardyAckSPSKey, kOSBooleanTrue);
5555 PM_ERROR("%s::setPowerState(%p, %lu -> %lu) timed out after %d ms\n",
5556 fName, OBFUSCATE(this), fCurrentPowerState, fHeadNotePowerState, NS_TO_MS(nsec));
5557
5558 #if DEBUG || DEVELOPMENT || !defined(XNU_TARGET_OS_OSX)
5559 bool panic_allowed = false;
5560 uint32_t setpowerstate_panic = -1;
5561 PE_parse_boot_argn("setpowerstate_panic", &setpowerstate_panic, sizeof(setpowerstate_panic));
5562 panic_allowed = setpowerstate_panic != 0;
5563 #ifdef CONFIG_XNUPOST
5564 uint64_t kernel_post_args = 0;
5565 PE_parse_boot_argn("kernPOST", &kernel_post_args, sizeof(kernel_post_args));
5566 if (kernel_post_args != 0) {
5567 panic_allowed = false;
5568 }
5569 #endif /* CONFIG_XNUPOST */
5570 if (panic_allowed) {
5571 // rdar://problem/48743340 - excluding AppleSEPManager from panic
5572 const char *allowlist = "AppleSEPManager";
5573 if (strncmp(fName, allowlist, strlen(allowlist))) {
5574 panic("%s::setPowerState(%p, %lu -> %lu) timed out after %d ms",
5575 fName, this, fCurrentPowerState, fHeadNotePowerState, NS_TO_MS(nsec));
5576 }
5577 } else {
5578 #ifdef CONFIG_XNUPOST
5579 if (kernel_post_args != 0) {
5580 PM_ERROR("setPowerState panic disabled by kernPOST boot-arg\n");
5581 }
5582 #endif /* CONFIG_XNUPOST */
5583 if (setpowerstate_panic != 0) {
5584 PM_ERROR("setPowerState panic disabled by setpowerstate_panic boot-arg\n");
5585 }
5586 }
5587 #else /* !(DEBUG || DEVELOPMENT || !defined(XNU_TARGET_OS_OSX)) */
5588 if (gIOKitDebug & kIOLogDebugPower) {
5589 panic("%s::setPowerState(%p, %lu -> %lu) timed out after %d ms",
5590 fName, this, fCurrentPowerState, fHeadNotePowerState, NS_TO_MS(nsec));
5591 } else {
5592 // panic for first party kexts
5593 const void *function_addr = NULL;
5594 OSKext *kext = NULL;
5595 function_addr = OSMemberFunctionCast(const void *, fControllingDriver, &IOService::setPowerState);
5596 kext = OSKext::lookupKextWithAddress((vm_address_t)function_addr);
5597 if (kext) {
5598 #if __has_feature(ptrauth_calls)
5599 function_addr = (const void*)VM_KERNEL_STRIP_PTR(function_addr);
5600 #endif /* __has_feature(ptrauth_calls) */
5601 const char *bundleID = kext->getIdentifierCString();
5602 const char *apple_prefix = "com.apple";
5603 const char *kernel_prefix = "__kernel__";
5604 if (strncmp(bundleID, apple_prefix, strlen(apple_prefix)) == 0 || strncmp(bundleID, kernel_prefix, strlen(kernel_prefix)) == 0) {
5605 // first party client
5606 panic("%s::setPowerState(%p : %p, %lu -> %lu) timed out after %d ms",
5607 fName, this, function_addr, fCurrentPowerState, fHeadNotePowerState, NS_TO_MS(nsec));
5608 }
5609 kext->release();
5610 }
5611 }
5612 #endif /* !(DEBUG || DEVELOPMENT || !defined(XNU_TARGET_OS_OSX)) */
5613 // Unblock state machine and pretend driver has acked.
5614 done = true;
5615 getPMRootDomain()->reset_watchdog_timer(this, 0);
5616 } else {
5617 // still waiting, set timer again
5618 start_ack_timer();
5619 }
5620 }
5621 break;
5622
5623 case kIOPM_NotifyChildrenStart:
5624 // are we waiting for interested parties to acknowledge?
5625 if (fHeadNotePendingAcks != 0) {
5626 // yes, go through the list of interested drivers
5627 nextObject = fInterestedDrivers->firstInList();
5628 // and check each one
5629 while (nextObject != NULL) {
5630 if (nextObject->timer > 0) {
5631 nextObject->timer--;
5632 // this one should have acked by now
5633 if (nextObject->timer == 0) {
5634 uint64_t nsec = computeTimeDeltaNS(&nextObject->startTime);
5635 OUR_PMLog(kPMLogIntDriverTardy, 0, 0);
5636 nextObject->whatObject->setProperty(kIOPMTardyAckPSCKey, kOSBooleanTrue);
5637 PM_ERROR("%s::powerState%sChangeTo(%p, %s, %lu -> %lu) timed out after %d ms\n",
5638 nextObject->whatObject->getName(),
5639 (fDriverCallReason == kDriverCallInformPreChange) ? "Will" : "Did",
5640 OBFUSCATE(nextObject->whatObject), fName, fCurrentPowerState, fHeadNotePowerState,
5641 NS_TO_MS(nsec));
5642
5643 // Pretend driver has acked.
5644 fHeadNotePendingAcks--;
5645 }
5646 }
5647 nextObject = fInterestedDrivers->nextInList(nextObject);
5648 }
5649
5650 // is that the last?
5651 if (fHeadNotePendingAcks == 0) {
5652 // yes, we can continue
5653 done = true;
5654 getPMRootDomain()->reset_watchdog_timer(this, 0);
5655 } else {
5656 // no, set timer again
5657 start_ack_timer();
5658 }
5659 }
5660 break;
5661
5662 // TODO: aggreggate this
5663 case kIOPM_OurChangeTellClientsPowerDown:
5664 case kIOPM_OurChangeTellUserPMPolicyPowerDown:
5665 case kIOPM_OurChangeTellPriorityClientsPowerDown:
5666 case kIOPM_OurChangeNotifyInterestedDriversWillChange:
5667 case kIOPM_ParentChangeTellPriorityClientsPowerDown:
5668 case kIOPM_ParentChangeNotifyInterestedDriversWillChange:
5669 case kIOPM_SyncTellClientsPowerDown:
5670 case kIOPM_SyncTellPriorityClientsPowerDown:
5671 case kIOPM_SyncNotifyWillChange:
5672 case kIOPM_TellCapabilityChangeDone:
5673 // apps didn't respond in time
5674 cleanClientResponses(true);
5675 OUR_PMLog(kPMLogClientTardy, 0, 1);
5676 // tardy equates to approval
5677 done = true;
5678 break;
5679
5680 default:
5681 PM_LOG1("%s: unexpected ack timer tick (state = %d)\n",
5682 getName(), fMachineState);
5683 break;
5684 }
5685 return done;
5686 }
5687
5688 //*********************************************************************************
5689 // [private] start_watchdog_timer
5690 //*********************************************************************************
5691 void
start_watchdog_timer(void)5692 IOService::start_watchdog_timer( void )
5693 {
5694 int timeout;
5695 uint64_t deadline;
5696
5697 if (!fWatchdogTimer || (kIOSleepWakeWdogOff & gIOKitDebug)) {
5698 return;
5699 }
5700
5701 IOLockLock(fWatchdogLock);
5702
5703 timeout = getPMRootDomain()->getWatchdogTimeout();
5704 clock_interval_to_deadline(timeout, kSecondScale, &deadline);
5705 start_watchdog_timer(deadline);
5706 IOLockUnlock(fWatchdogLock);
5707 }
5708
5709 void
start_watchdog_timer(uint64_t deadline)5710 IOService::start_watchdog_timer(uint64_t deadline)
5711 {
5712 IOLockAssert(fWatchdogLock, kIOLockAssertOwned);
5713 fWatchdogDeadline = deadline;
5714
5715 if (!thread_call_isactive(fWatchdogTimer)) {
5716 thread_call_enter_delayed(fWatchdogTimer, deadline);
5717 }
5718 }
5719
5720 //*********************************************************************************
5721 // [private] stop_watchdog_timer
5722 //*********************************************************************************
5723
5724 void
stop_watchdog_timer(void)5725 IOService::stop_watchdog_timer( void )
5726 {
5727 if (!fWatchdogTimer || (kIOSleepWakeWdogOff & gIOKitDebug)) {
5728 return;
5729 }
5730
5731 IOLockLock(fWatchdogLock);
5732
5733 thread_call_cancel(fWatchdogTimer);
5734 fWatchdogDeadline = 0;
5735
5736 while (fBlockedArray->getCount()) {
5737 IOService *obj = OSDynamicCast(IOService, fBlockedArray->getObject(0));
5738 if (obj) {
5739 PM_ERROR("WDOG:Object %s unexpected in blocked array\n", obj->fName);
5740 fBlockedArray->removeObject(0);
5741 }
5742 }
5743
5744 IOLockUnlock(fWatchdogLock);
5745 }
5746
5747 //*********************************************************************************
5748 // reset_watchdog_timer
5749 //*********************************************************************************
5750
5751 void
reset_watchdog_timer(IOService * blockedObject,int pendingResponseTimeout)5752 IOService::reset_watchdog_timer(IOService *blockedObject, int pendingResponseTimeout)
5753 {
5754 unsigned int i;
5755 uint64_t deadline;
5756 IOService *obj;
5757
5758 if (!fWatchdogTimer || (kIOSleepWakeWdogOff & gIOKitDebug)) {
5759 return;
5760 }
5761
5762
5763 IOLockLock(fWatchdogLock);
5764 if (!fWatchdogDeadline) {
5765 goto exit;
5766 }
5767
5768 i = fBlockedArray->getNextIndexOfObject(blockedObject, 0);
5769 if (pendingResponseTimeout == 0) {
5770 blockedObject->fPendingResponseDeadline = 0;
5771 if (i == (unsigned int)-1) {
5772 goto exit;
5773 }
5774 fBlockedArray->removeObject(i);
5775 } else {
5776 // Set deadline 2secs after the expected response timeout to allow
5777 // ack timer to handle the timeout.
5778 clock_interval_to_deadline(pendingResponseTimeout + 2, kSecondScale, &deadline);
5779
5780 if (i != (unsigned int)-1) {
5781 PM_ERROR("WDOG:Object %s is already blocked for responses. Ignoring timeout %d\n",
5782 fName, pendingResponseTimeout);
5783 goto exit;
5784 }
5785
5786 for (i = 0; i < fBlockedArray->getCount(); i++) {
5787 obj = OSDynamicCast(IOService, fBlockedArray->getObject(i));
5788 if (obj && (obj->fPendingResponseDeadline < deadline)) {
5789 blockedObject->fPendingResponseDeadline = deadline;
5790 fBlockedArray->setObject(i, blockedObject);
5791 break;
5792 }
5793 }
5794 if (i == fBlockedArray->getCount()) {
5795 blockedObject->fPendingResponseDeadline = deadline;
5796 fBlockedArray->setObject(blockedObject);
5797 }
5798 }
5799
5800 obj = OSDynamicCast(IOService, fBlockedArray->getObject(0));
5801 if (!obj) {
5802 int timeout = getPMRootDomain()->getWatchdogTimeout();
5803 clock_interval_to_deadline(timeout, kSecondScale, &deadline);
5804 } else {
5805 deadline = obj->fPendingResponseDeadline;
5806 }
5807
5808 thread_call_cancel(fWatchdogTimer);
5809 start_watchdog_timer(deadline);
5810
5811 exit:
5812 IOLockUnlock(fWatchdogLock);
5813 }
5814
5815 void
reset_watchdog_timer(int timeout)5816 IOService::reset_watchdog_timer(int timeout)
5817 {
5818 uint64_t deadline;
5819
5820 if (!fWatchdogTimer || (kIOSleepWakeWdogOff & gIOKitDebug)) {
5821 return;
5822 }
5823
5824 IOLockLock(fWatchdogLock);
5825 if (!fWatchdogDeadline) {
5826 goto exit;
5827 }
5828
5829 if (timeout == 0) {
5830 int defaultTimeout = getPMRootDomain()->getWatchdogTimeout();
5831 clock_interval_to_deadline(defaultTimeout, kSecondScale, &deadline);
5832 } else {
5833 clock_interval_to_deadline(timeout, kSecondScale, &deadline);
5834 }
5835
5836 thread_call_cancel(fWatchdogTimer);
5837 start_watchdog_timer(deadline);
5838
5839 exit:
5840 IOLockUnlock(fWatchdogLock);
5841 }
5842
5843 //*********************************************************************************
5844 // [static] watchdog_timer_expired
5845 //
5846 // Inside PM work loop's gate.
5847 //*********************************************************************************
5848
5849 void
watchdog_timer_expired(thread_call_param_t arg0,thread_call_param_t arg1)5850 IOService::watchdog_timer_expired( thread_call_param_t arg0, thread_call_param_t arg1 )
5851 {
5852 IOService * me = (IOService *) arg0;
5853 bool expired;
5854
5855 IOLockLock(me->fWatchdogLock);
5856 expired = me->fWatchdogDeadline && (me->fWatchdogDeadline <= mach_absolute_time());
5857 IOLockUnlock(me->fWatchdogLock);
5858 if (!expired) {
5859 return;
5860 }
5861
5862 gIOPMWatchDogThread = current_thread();
5863 getPMRootDomain()->sleepWakeDebugTrig(true);
5864 gIOPMWatchDogThread = NULL;
5865 thread_call_free(me->fWatchdogTimer);
5866 me->fWatchdogTimer = NULL;
5867
5868 return;
5869 }
5870
5871
5872 IOWorkLoop *
getIOPMWorkloop(void)5873 IOService::getIOPMWorkloop( void )
5874 {
5875 return gIOPMWorkLoop;
5876 }
5877
5878
5879
5880 //*********************************************************************************
5881 // [private] start_ack_timer
5882 //*********************************************************************************
5883
5884 void
start_ack_timer(void)5885 IOService::start_ack_timer( void )
5886 {
5887 start_ack_timer( ACK_TIMER_PERIOD, kNanosecondScale );
5888 }
5889
5890 void
start_ack_timer(UInt32 interval,UInt32 scale)5891 IOService::start_ack_timer( UInt32 interval, UInt32 scale )
5892 {
5893 AbsoluteTime deadline;
5894 boolean_t pending;
5895
5896 clock_interval_to_deadline(interval, scale, &deadline);
5897
5898 retain();
5899 pending = thread_call_enter_delayed(fAckTimer, deadline);
5900 if (pending) {
5901 release();
5902 }
5903 }
5904
5905 //*********************************************************************************
5906 // [private] stop_ack_timer
5907 //*********************************************************************************
5908
5909 void
stop_ack_timer(void)5910 IOService::stop_ack_timer( void )
5911 {
5912 boolean_t pending;
5913
5914 pending = thread_call_cancel(fAckTimer);
5915 if (pending) {
5916 release();
5917 }
5918 }
5919
5920 //*********************************************************************************
5921 // [static] actionAckTimerExpired
5922 //
5923 // Inside PM work loop's gate.
5924 //*********************************************************************************
5925
5926 IOReturn
actionAckTimerExpired(OSObject * target,void * arg0,void * arg1,void * arg2,void * arg3)5927 IOService::actionAckTimerExpired(
5928 OSObject * target,
5929 void * arg0, void * arg1,
5930 void * arg2, void * arg3 )
5931 {
5932 IOService * me = (IOService *) target;
5933 bool done;
5934
5935 // done will be true if the timer tick unblocks the machine state,
5936 // otherwise no need to signal the work loop.
5937
5938 done = me->ackTimerTick();
5939 if (done && gIOPMWorkQueue) {
5940 gIOPMWorkQueue->signalWorkAvailable();
5941 }
5942
5943 return kIOReturnSuccess;
5944 }
5945
5946 //*********************************************************************************
5947 // ack_timer_expired
5948 //
5949 // Thread call function. Holds a retain while the callout is in flight.
5950 //*********************************************************************************
5951
5952 void
ack_timer_expired(thread_call_param_t arg0,thread_call_param_t arg1)5953 IOService::ack_timer_expired( thread_call_param_t arg0, thread_call_param_t arg1 )
5954 {
5955 IOService * me = (IOService *) arg0;
5956
5957 if (gIOPMWorkLoop) {
5958 gIOPMWorkLoop->runAction(&actionAckTimerExpired, me);
5959 }
5960 me->release();
5961 }
5962
5963
5964 // MARK: -
5965 // MARK: Client Messaging
5966
5967 //*********************************************************************************
5968 // [private] tellSystemCapabilityChange
5969 //*********************************************************************************
5970
5971 void
tellSystemCapabilityChange(uint32_t nextMS)5972 IOService::tellSystemCapabilityChange( uint32_t nextMS )
5973 {
5974 assert(IS_ROOT_DOMAIN);
5975
5976 MS_PUSH( nextMS );
5977 fMachineState = kIOPM_TellCapabilityChangeDone;
5978 fOutOfBandMessage = kIOMessageSystemCapabilityChange;
5979
5980 if (fIsPreChange) {
5981 // Notify app first on pre-change.
5982 fOutOfBandParameter = kNotifyCapabilityChangeApps;
5983 } else {
5984 // Notify kernel clients first on post-change.
5985 fOutOfBandParameter = kNotifyCapabilityChangePriority;
5986 }
5987
5988 tellClientsWithResponse( fOutOfBandMessage );
5989 }
5990
5991 //*********************************************************************************
5992 // [public] askChangeDown
5993 //
5994 // Ask registered applications and kernel clients if we can change to a lower
5995 // power state.
5996 //
5997 // Subclass can override this to send a different message type. Parameter is
5998 // the destination state number.
5999 //
6000 // Return true if we don't have to wait for acknowledgements
6001 //*********************************************************************************
6002
6003 bool
askChangeDown(unsigned long stateNum)6004 IOService::askChangeDown( unsigned long stateNum )
6005 {
6006 return tellClientsWithResponse( kIOMessageCanDevicePowerOff );
6007 }
6008
6009 //*********************************************************************************
6010 // [private] tellChangeDown1
6011 //
6012 // Notify registered applications and kernel clients that we are definitely
6013 // dropping power.
6014 //
6015 // Return true if we don't have to wait for acknowledgements
6016 //*********************************************************************************
6017
6018 bool
tellChangeDown1(unsigned long stateNum)6019 IOService::tellChangeDown1( unsigned long stateNum )
6020 {
6021 fOutOfBandParameter = kNotifyApps;
6022 return tellChangeDown(stateNum);
6023 }
6024
6025 //*********************************************************************************
6026 // [private] tellChangeDown2
6027 //
6028 // Notify priority clients that we are definitely dropping power.
6029 //
6030 // Return true if we don't have to wait for acknowledgements
6031 //*********************************************************************************
6032
6033 bool
tellChangeDown2(unsigned long stateNum)6034 IOService::tellChangeDown2( unsigned long stateNum )
6035 {
6036 fOutOfBandParameter = kNotifyPriority;
6037 return tellChangeDown(stateNum);
6038 }
6039
6040 //*********************************************************************************
6041 // [public] tellChangeDown
6042 //
6043 // Notify registered applications and kernel clients that we are definitely
6044 // dropping power.
6045 //
6046 // Subclass can override this to send a different message type. Parameter is
6047 // the destination state number.
6048 //
6049 // Return true if we don't have to wait for acknowledgements
6050 //*********************************************************************************
6051
6052 bool
tellChangeDown(unsigned long stateNum)6053 IOService::tellChangeDown( unsigned long stateNum )
6054 {
6055 return tellClientsWithResponse( kIOMessageDeviceWillPowerOff );
6056 }
6057
6058 //*********************************************************************************
6059 // cleanClientResponses
6060 //
6061 //*********************************************************************************
6062
6063 static void
logAppTimeouts(OSObject * object,void * arg)6064 logAppTimeouts( OSObject * object, void * arg )
6065 {
6066 IOPMInterestContext * context = (IOPMInterestContext *) arg;
6067 OSObject * flag;
6068 unsigned int clientIndex;
6069 int pid = 0;
6070 char name[128];
6071
6072 if (OSDynamicCast(_IOServiceInterestNotifier, object)) {
6073 // Discover the 'counter' value or index assigned to this client
6074 // when it was notified, by searching for the array index of the
6075 // client in an array holding the cached interested clients.
6076
6077 clientIndex = context->notifyClients->getNextIndexOfObject(object, 0);
6078
6079 if ((clientIndex != (unsigned int) -1) &&
6080 (flag = context->responseArray->getObject(clientIndex)) &&
6081 (flag != kOSBooleanTrue)) {
6082 OSNumber *clientID = copyClientIDForNotification(object, context);
6083
6084 name[0] = '\0';
6085 if (clientID) {
6086 pid = clientID->unsigned32BitValue();
6087 proc_name(pid, name, sizeof(name));
6088 clientID->release();
6089 }
6090
6091 PM_ERROR("PM notification timeout (pid %d, %s)\n", pid, name);
6092
6093 // TODO: record message type if possible
6094 IOService::getPMRootDomain()->pmStatsRecordApplicationResponse(
6095 gIOPMStatsResponseTimedOut,
6096 name, 0, (30 * 1000), pid, object);
6097 }
6098 }
6099 }
6100
6101 void
cleanClientResponses(bool logErrors)6102 IOService::cleanClientResponses( bool logErrors )
6103 {
6104 if (logErrors && fResponseArray) {
6105 switch (fOutOfBandParameter) {
6106 case kNotifyApps:
6107 case kNotifyCapabilityChangeApps:
6108 if (fNotifyClientArray) {
6109 IOPMInterestContext context;
6110
6111 context.responseArray = fResponseArray;
6112 context.notifyClients = fNotifyClientArray;
6113 context.serialNumber = fSerialNumber;
6114 context.messageType = kIOMessageCopyClientID;
6115 context.notifyType = kNotifyApps;
6116 context.isPreChange = fIsPreChange;
6117 context.enableTracing = false;
6118 context.us = this;
6119 context.maxTimeRequested = 0;
6120 context.stateNumber = fHeadNotePowerState;
6121 context.stateFlags = fHeadNotePowerArrayEntry->capabilityFlags;
6122 context.changeFlags = fHeadNoteChangeFlags;
6123
6124 applyToInterested(gIOAppPowerStateInterest, logAppTimeouts, (void *) &context);
6125 }
6126 break;
6127
6128 default:
6129 // kNotifyPriority, kNotifyCapabilityChangePriority
6130 // TODO: identify the priority client that has not acked
6131 PM_ERROR("PM priority notification timeout\n");
6132 if (gIOKitDebug & kIOLogDebugPower) {
6133 panic("PM priority notification timeout");
6134 }
6135 break;
6136 }
6137 }
6138
6139 if (IS_ROOT_DOMAIN) {
6140 getPMRootDomain()->reset_watchdog_timer(this, 0);
6141 }
6142 if (fResponseArray) {
6143 fResponseArray->release();
6144 fResponseArray = NULL;
6145 }
6146 if (fNotifyClientArray) {
6147 fNotifyClientArray->release();
6148 fNotifyClientArray = NULL;
6149 }
6150 }
6151
6152 //*********************************************************************************
6153 // [protected] tellClientsWithResponse
6154 //
6155 // Notify registered applications and kernel clients that we are definitely
6156 // dropping power.
6157 //
6158 // Return true if we don't have to wait for acknowledgements
6159 //*********************************************************************************
6160
6161 bool
tellClientsWithResponse(int messageType)6162 IOService::tellClientsWithResponse( int messageType )
6163 {
6164 IOPMInterestContext context;
6165 bool isRootDomain = IS_ROOT_DOMAIN;
6166 uint32_t maxTimeOut = kMaxTimeRequested;
6167
6168 PM_ASSERT_IN_GATE();
6169 assert( fResponseArray == NULL );
6170 assert( fNotifyClientArray == NULL );
6171
6172 RD_LOG("tellClientsWithResponse( %s, %s )\n", getIOMessageString(messageType),
6173 getNotificationPhaseString(fOutOfBandParameter));
6174
6175 fResponseArray = OSArray::withCapacity( 1 );
6176 if (!fResponseArray) {
6177 goto exit;
6178 }
6179
6180 fResponseArray->setCapacityIncrement(8);
6181 if (++fSerialNumber == 0) {
6182 fSerialNumber++;
6183 }
6184
6185 context.responseArray = fResponseArray;
6186 context.notifyClients = NULL;
6187 context.serialNumber = fSerialNumber;
6188 context.messageType = messageType;
6189 context.notifyType = fOutOfBandParameter;
6190 context.skippedInDark = 0;
6191 context.notSkippedInDark = 0;
6192 context.isPreChange = fIsPreChange;
6193 context.enableTracing = false;
6194 context.us = this;
6195 context.maxTimeRequested = 0;
6196 context.stateNumber = fHeadNotePowerState;
6197 context.stateFlags = fHeadNotePowerArrayEntry->capabilityFlags;
6198 context.changeFlags = fHeadNoteChangeFlags;
6199 context.messageFilter = (isRootDomain) ?
6200 OSMemberFunctionCast(
6201 IOPMMessageFilter,
6202 (IOPMrootDomain *)this,
6203 &IOPMrootDomain::systemMessageFilter) : NULL;
6204
6205 switch (fOutOfBandParameter) {
6206 case kNotifyApps:
6207 applyToInterested( gIOAppPowerStateInterest,
6208 pmTellAppWithResponse, (void *) &context );
6209
6210 if (isRootDomain &&
6211 (fMachineState != kIOPM_OurChangeTellClientsPowerDown) &&
6212 (fMachineState != kIOPM_SyncTellClientsPowerDown) &&
6213 (context.messageType != kIOPMMessageLastCallBeforeSleep)) {
6214 // Notify capability app for tellChangeDown1()
6215 // but not for askChangeDown().
6216 context.notifyType = kNotifyCapabilityChangeApps;
6217 context.messageType = kIOMessageSystemCapabilityChange;
6218 applyToInterested( gIOAppPowerStateInterest,
6219 pmTellCapabilityAppWithResponse, (void *) &context );
6220 context.notifyType = fOutOfBandParameter;
6221 context.messageType = messageType;
6222 }
6223 if (context.messageType == kIOMessageCanSystemSleep) {
6224 maxTimeOut = kCanSleepMaxTimeReq;
6225 if (gSleepAckTimeout) {
6226 maxTimeOut = (gSleepAckTimeout * us_per_s);
6227 }
6228 }
6229 if (context.messageType == kIOMessageSystemWillSleep) {
6230 maxTimeOut = kWillSleepMaxTimeReq;
6231 if (gSleepAckTimeout) {
6232 maxTimeOut = (gSleepAckTimeout * us_per_s);
6233 }
6234 }
6235 context.maxTimeRequested = maxTimeOut;
6236 context.enableTracing = isRootDomain;
6237 applyToInterested( gIOGeneralInterest,
6238 pmTellClientWithResponse, (void *) &context );
6239
6240 break;
6241
6242 case kNotifyPriority:
6243 context.enableTracing = isRootDomain;
6244 applyToInterested( gIOPriorityPowerStateInterest,
6245 pmTellClientWithResponse, (void *) &context );
6246
6247 if (isRootDomain) {
6248 // Notify capability clients for tellChangeDown2().
6249 context.notifyType = kNotifyCapabilityChangePriority;
6250 context.messageType = kIOMessageSystemCapabilityChange;
6251 applyToInterested( gIOPriorityPowerStateInterest,
6252 pmTellCapabilityClientWithResponse, (void *) &context );
6253 }
6254 break;
6255
6256 case kNotifyCapabilityChangeApps:
6257 context.enableTracing = isRootDomain;
6258 applyToInterested( gIOAppPowerStateInterest,
6259 pmTellCapabilityAppWithResponse, (void *) &context );
6260 if (context.messageType == kIOMessageCanSystemSleep) {
6261 maxTimeOut = kCanSleepMaxTimeReq;
6262 if (gSleepAckTimeout) {
6263 maxTimeOut = (gSleepAckTimeout * us_per_s);
6264 }
6265 }
6266 context.maxTimeRequested = maxTimeOut;
6267 break;
6268
6269 case kNotifyCapabilityChangePriority:
6270 context.enableTracing = isRootDomain;
6271 applyToInterested( gIOPriorityPowerStateInterest,
6272 pmTellCapabilityClientWithResponse, (void *) &context );
6273 break;
6274 }
6275 fNotifyClientArray = context.notifyClients;
6276
6277 if (context.skippedInDark) {
6278 IOLog("tellClientsWithResponse(%s, %s) %d of %d skipped in dark\n",
6279 getIOMessageString(messageType), getNotificationPhaseString(fOutOfBandParameter),
6280 context.skippedInDark, context.skippedInDark + context.notSkippedInDark);
6281 }
6282
6283 // do we have to wait for somebody?
6284 if (!checkForDone()) {
6285 OUR_PMLog(kPMLogStartAckTimer, context.maxTimeRequested, 0);
6286 if (context.enableTracing) {
6287 getPMRootDomain()->traceDetail(context.messageType, 0, context.maxTimeRequested / 1000);
6288 getPMRootDomain()->reset_watchdog_timer(this, context.maxTimeRequested / USEC_PER_SEC + 1);
6289 }
6290 start_ack_timer( context.maxTimeRequested / 1000, kMillisecondScale );
6291 return false;
6292 }
6293
6294 exit:
6295 // everybody responded
6296 if (fResponseArray) {
6297 fResponseArray->release();
6298 fResponseArray = NULL;
6299 }
6300 if (fNotifyClientArray) {
6301 fNotifyClientArray->release();
6302 fNotifyClientArray = NULL;
6303 }
6304
6305 return true;
6306 }
6307
6308 //*********************************************************************************
6309 // [static private] pmTellAppWithResponse
6310 //
6311 // We send a message to an application, and we expect a response, so we compute a
6312 // cookie we can identify the response with.
6313 //*********************************************************************************
6314
6315 void
pmTellAppWithResponse(OSObject * object,void * arg)6316 IOService::pmTellAppWithResponse( OSObject * object, void * arg )
6317 {
6318 IOPMInterestContext * context = (IOPMInterestContext *) arg;
6319 IOServicePM * pwrMgt = context->us->pwrMgt;
6320 uint32_t msgIndex, msgRef, msgType;
6321 OSNumber *clientID = NULL;
6322 proc_t proc = NULL;
6323 boolean_t proc_suspended = FALSE;
6324 OSObject * waitForReply = kOSBooleanTrue;
6325 #if LOG_APP_RESPONSE_TIMES
6326 AbsoluteTime now;
6327 #endif
6328
6329 if (!OSDynamicCast(_IOServiceInterestNotifier, object)) {
6330 return;
6331 }
6332
6333 if (context->us == getPMRootDomain()) {
6334 if ((clientID = copyClientIDForNotification(object, context))) {
6335 uint32_t clientPID = clientID->unsigned32BitValue();
6336 clientID->release();
6337 proc = proc_find(clientPID);
6338
6339 if (proc) {
6340 proc_suspended = get_task_pidsuspended((task_t) proc_task(proc));
6341 if (proc_suspended) {
6342 logClientIDForNotification(object, context, "PMTellAppWithResponse - Suspended");
6343 } else if (getPMRootDomain()->isAOTMode() && get_task_suspended((task_t) proc_task(proc))) {
6344 proc_suspended = true;
6345 context->skippedInDark++;
6346 }
6347 proc_rele(proc);
6348 if (proc_suspended) {
6349 return;
6350 }
6351 }
6352 }
6353 }
6354
6355 if (context->messageFilter &&
6356 !context->messageFilter(context->us, object, context, NULL, &waitForReply)) {
6357 if (kIOLogDebugPower & gIOKitDebug) {
6358 logClientIDForNotification(object, context, "DROP App");
6359 }
6360 return;
6361 }
6362 context->notSkippedInDark++;
6363
6364 // Create client array (for tracking purposes) only if the service
6365 // has app clients. Usually only root domain does.
6366 if (NULL == context->notifyClients) {
6367 context->notifyClients = OSArray::withCapacity( 32 );
6368 }
6369
6370 msgType = context->messageType;
6371 msgIndex = context->responseArray->getCount();
6372 msgRef = ((context->serialNumber & 0xFFFF) << 16) + (msgIndex & 0xFFFF);
6373
6374 OUR_PMLog(kPMLogAppNotify, msgType, msgRef);
6375 if (kIOLogDebugPower & gIOKitDebug) {
6376 logClientIDForNotification(object, context, "MESG App");
6377 }
6378
6379 if (waitForReply == kOSBooleanTrue) {
6380 OSNumber * num;
6381 clock_get_uptime(&now);
6382 num = OSNumber::withNumber(AbsoluteTime_to_scalar(&now), sizeof(uint64_t) * 8);
6383 if (num) {
6384 context->responseArray->setObject(msgIndex, num);
6385 num->release();
6386 } else {
6387 context->responseArray->setObject(msgIndex, kOSBooleanFalse);
6388 }
6389 } else {
6390 context->responseArray->setObject(msgIndex, kOSBooleanTrue);
6391 if (kIOLogDebugPower & gIOKitDebug) {
6392 logClientIDForNotification(object, context, "App response ignored");
6393 }
6394 }
6395
6396 if (context->notifyClients) {
6397 context->notifyClients->setObject(msgIndex, object);
6398 }
6399
6400 context->us->messageClient(msgType, object, (void *)(uintptr_t) msgRef);
6401 }
6402
6403 //*********************************************************************************
6404 // [static private] pmTellClientWithResponse
6405 //
6406 // We send a message to an in-kernel client, and we expect a response,
6407 // so we compute a cookie we can identify the response with.
6408 //*********************************************************************************
6409
6410 void
pmTellClientWithResponse(OSObject * object,void * arg)6411 IOService::pmTellClientWithResponse( OSObject * object, void * arg )
6412 {
6413 IOPowerStateChangeNotification notify;
6414 IOPMInterestContext * context = (IOPMInterestContext *) arg;
6415 OSObject * replied = kOSBooleanTrue;
6416 _IOServiceInterestNotifier * notifier;
6417 uint32_t msgIndex, msgRef, msgType;
6418 IOReturn retCode;
6419 AbsoluteTime start, end;
6420 uint64_t nsec;
6421 bool enableTracing;
6422
6423 if (context->messageFilter &&
6424 !context->messageFilter(context->us, object, context, NULL, NULL)) {
6425 getPMRootDomain()->traceFilteredNotification(object);
6426 return;
6427 }
6428
6429 // Besides interest notifiers this applier function can also be invoked against
6430 // IOService clients of context->us, so notifier can be NULL. But for tracing
6431 // purposes the IOService clients can be ignored but each will still consume
6432 // an entry in the responseArray and also advance msgIndex.
6433 notifier = OSDynamicCast(_IOServiceInterestNotifier, object);
6434 msgType = context->messageType;
6435 msgIndex = context->responseArray->getCount();
6436 msgRef = ((context->serialNumber & 0xFFFF) << 16) + (msgIndex & 0xFFFF);
6437 enableTracing = context->enableTracing && (notifier != NULL);
6438
6439 IOServicePM * pwrMgt = context->us->pwrMgt;
6440 if (gIOKitDebug & kIOLogPower) {
6441 OUR_PMLog(kPMLogClientNotify, msgRef, msgType);
6442 if (OSDynamicCast(IOService, object)) {
6443 const char *who = ((IOService *) object)->getName();
6444 gPlatform->PMLog(who, kPMLogClientNotify, (uintptr_t) object, 0);
6445 } else if (notifier) {
6446 OUR_PMLog(kPMLogClientNotify, (uintptr_t) notifier->handler, 0);
6447 }
6448 }
6449
6450 if (NULL == context->notifyClients) {
6451 context->notifyClients = OSArray::withCapacity(32);
6452 assert(context->notifyClients != NULL);
6453 }
6454
6455 notify.powerRef = (void *)(uintptr_t) msgRef;
6456 notify.returnValue = 0;
6457 notify.stateNumber = context->stateNumber;
6458 notify.stateFlags = context->stateFlags;
6459
6460 clock_get_uptime(&start);
6461 if (enableTracing) {
6462 getPMRootDomain()->traceNotification(notifier, true, start, msgIndex);
6463 }
6464
6465 retCode = context->us->messageClient(msgType, object, (void *) ¬ify, sizeof(notify));
6466
6467 clock_get_uptime(&end);
6468 if (enableTracing) {
6469 getPMRootDomain()->traceNotification(notifier, false, end);
6470 }
6471
6472 if (kIOReturnSuccess == retCode) {
6473 if (0 == notify.returnValue) {
6474 OUR_PMLog(kPMLogClientAcknowledge, msgRef, (uintptr_t) object);
6475 context->responseArray->setObject(msgIndex, replied);
6476 } else {
6477 replied = kOSBooleanFalse;
6478 uint32_t ackTimeRequested = (uint32_t) notify.returnValue;
6479 if (notify.returnValue > context->maxTimeRequested) {
6480 if (notify.returnValue > kPriorityClientMaxWait) {
6481 context->maxTimeRequested = ackTimeRequested = kPriorityClientMaxWait;
6482 PM_ERROR("%s: client %p returned %llu for %s\n",
6483 context->us->getName(),
6484 notifier ? (void *) OBFUSCATE(notifier->handler) : OBFUSCATE(object),
6485 (uint64_t) notify.returnValue,
6486 getIOMessageString(msgType));
6487 } else {
6488 context->maxTimeRequested = (typeof(context->maxTimeRequested))notify.returnValue;
6489 }
6490 }
6491
6492 // Track acknowledgements by storing the timestamp of
6493 // callback completion and requested ack time.
6494 IOPMClientAck *ackState = new IOPMClientAck;
6495 if (ackState) {
6496 ackState->completionTimestamp = AbsoluteTime_to_scalar(&end);
6497 ackState->maxTimeRequested = ackTimeRequested;
6498 context->responseArray->setObject(msgIndex, ackState);
6499 OSSafeReleaseNULL(ackState);
6500 } else {
6501 context->responseArray->setObject(msgIndex, replied);
6502 }
6503 }
6504
6505 if (enableTracing) {
6506 SUB_ABSOLUTETIME(&end, &start);
6507 absolutetime_to_nanoseconds(end, &nsec);
6508
6509 if ((nsec > LOG_KEXT_RESPONSE_TIMES) || (notify.returnValue != 0)) {
6510 getPMRootDomain()->traceNotificationResponse(notifier, NS_TO_MS(nsec), (uint32_t) notify.returnValue);
6511 }
6512 }
6513 } else {
6514 // not a client of ours
6515 // so we won't be waiting for response
6516 OUR_PMLog(kPMLogClientAcknowledge, msgRef, 0);
6517 context->responseArray->setObject(msgIndex, replied);
6518 }
6519 if (context->notifyClients) {
6520 context->notifyClients->setObject(msgIndex, object);
6521 }
6522 }
6523
6524 //*********************************************************************************
6525 // [static private] pmTellCapabilityAppWithResponse
6526 //*********************************************************************************
6527
6528 void
pmTellCapabilityAppWithResponse(OSObject * object,void * arg)6529 IOService::pmTellCapabilityAppWithResponse( OSObject * object, void * arg )
6530 {
6531 IOPMSystemCapabilityChangeParameters msgArg;
6532 IOPMInterestContext * context = (IOPMInterestContext *) arg;
6533 OSObject * waitForReply = kOSBooleanFalse;
6534 IOServicePM * pwrMgt = context->us->pwrMgt;
6535 uint32_t msgIndex, msgRef, msgType;
6536 #if LOG_APP_RESPONSE_TIMES
6537 AbsoluteTime now;
6538 #endif
6539
6540 if (!OSDynamicCast(_IOServiceInterestNotifier, object)) {
6541 return;
6542 }
6543
6544 memset(&msgArg, 0, sizeof(msgArg));
6545 if (context->messageFilter &&
6546 !context->messageFilter(context->us, object, context, &msgArg, &waitForReply)) {
6547 return;
6548 }
6549
6550 if (context->us == getPMRootDomain() &&
6551 getPMRootDomain()->isAOTMode()
6552 ) {
6553 OSNumber *clientID = NULL;
6554 boolean_t proc_suspended = FALSE;
6555 proc_t proc = NULL;
6556 if ((clientID = copyClientIDForNotification(object, context))) {
6557 uint32_t clientPID = clientID->unsigned32BitValue();
6558 clientID->release();
6559 proc = proc_find(clientPID);
6560 if (proc) {
6561 proc_suspended = get_task_pidsuspended((task_t) proc_task(proc));
6562 if (proc_suspended) {
6563 logClientIDForNotification(object, context, "PMTellCapablityAppWithResponse - Suspended");
6564 } else if (get_task_suspended((task_t) proc_task(proc))) {
6565 proc_suspended = true;
6566 context->skippedInDark++;
6567 }
6568 proc_rele(proc);
6569 if (proc_suspended) {
6570 return;
6571 }
6572 }
6573 }
6574 }
6575 context->notSkippedInDark++;
6576
6577 // Create client array (for tracking purposes) only if the service
6578 // has app clients. Usually only root domain does.
6579 if (NULL == context->notifyClients) {
6580 context->notifyClients = OSArray::withCapacity(32);
6581 assert(context->notifyClients != NULL);
6582 }
6583
6584 msgType = context->messageType;
6585 msgIndex = context->responseArray->getCount();
6586 msgRef = ((context->serialNumber & 0xFFFF) << 16) + (msgIndex & 0xFFFF);
6587
6588 OUR_PMLog(kPMLogAppNotify, msgType, msgRef);
6589 if (kIOLogDebugPower & gIOKitDebug) {
6590 // Log client pid/name and client array index.
6591 OSNumber * clientID = NULL;
6592 OSString * clientIDString = NULL;
6593 context->us->messageClient(kIOMessageCopyClientID, object, &clientID);
6594 if (clientID) {
6595 clientIDString = IOCopyLogNameForPID(clientID->unsigned32BitValue());
6596 }
6597
6598 PM_LOG("%s MESG App(%u) %s, wait %u, %s\n",
6599 context->us->getName(),
6600 msgIndex, getIOMessageString(msgType),
6601 (waitForReply == kOSBooleanTrue),
6602 clientIDString ? clientIDString->getCStringNoCopy() : "");
6603 if (clientID) {
6604 clientID->release();
6605 }
6606 if (clientIDString) {
6607 clientIDString->release();
6608 }
6609 }
6610
6611 msgArg.notifyRef = msgRef;
6612 msgArg.maxWaitForReply = 0;
6613
6614 if (waitForReply == kOSBooleanFalse) {
6615 msgArg.notifyRef = 0;
6616 context->responseArray->setObject(msgIndex, kOSBooleanTrue);
6617 if (context->notifyClients) {
6618 context->notifyClients->setObject(msgIndex, kOSBooleanTrue);
6619 }
6620 } else {
6621 OSNumber * num;
6622 clock_get_uptime(&now);
6623 num = OSNumber::withNumber(AbsoluteTime_to_scalar(&now), sizeof(uint64_t) * 8);
6624 if (num) {
6625 context->responseArray->setObject(msgIndex, num);
6626 num->release();
6627 } else {
6628 context->responseArray->setObject(msgIndex, kOSBooleanFalse);
6629 }
6630
6631 if (context->notifyClients) {
6632 context->notifyClients->setObject(msgIndex, object);
6633 }
6634 }
6635
6636 context->us->messageClient(msgType, object, (void *) &msgArg, sizeof(msgArg));
6637 }
6638
6639 //*********************************************************************************
6640 // [static private] pmTellCapabilityClientWithResponse
6641 //*********************************************************************************
6642
6643 void
pmTellCapabilityClientWithResponse(OSObject * object,void * arg)6644 IOService::pmTellCapabilityClientWithResponse(
6645 OSObject * object, void * arg )
6646 {
6647 IOPMSystemCapabilityChangeParameters msgArg;
6648 IOPMInterestContext * context = (IOPMInterestContext *) arg;
6649 OSObject * replied = kOSBooleanTrue;
6650 _IOServiceInterestNotifier * notifier;
6651 uint32_t msgIndex, msgRef, msgType;
6652 IOReturn retCode;
6653 AbsoluteTime start, end;
6654 uint64_t nsec;
6655 bool enableTracing;
6656
6657 memset(&msgArg, 0, sizeof(msgArg));
6658 if (context->messageFilter &&
6659 !context->messageFilter(context->us, object, context, &msgArg, NULL)) {
6660 getPMRootDomain()->traceFilteredNotification(object);
6661 return;
6662 }
6663
6664 if (NULL == context->notifyClients) {
6665 context->notifyClients = OSArray::withCapacity(32);
6666 assert(context->notifyClients != NULL);
6667 }
6668
6669 notifier = OSDynamicCast(_IOServiceInterestNotifier, object);
6670 msgType = context->messageType;
6671 msgIndex = context->responseArray->getCount();
6672 msgRef = ((context->serialNumber & 0xFFFF) << 16) + (msgIndex & 0xFFFF);
6673 enableTracing = context->enableTracing && (notifier != NULL);
6674
6675 IOServicePM * pwrMgt = context->us->pwrMgt;
6676 if (gIOKitDebug & kIOLogPower) {
6677 OUR_PMLog(kPMLogClientNotify, msgRef, msgType);
6678 if (OSDynamicCast(IOService, object)) {
6679 const char *who = ((IOService *) object)->getName();
6680 gPlatform->PMLog(who, kPMLogClientNotify, (uintptr_t) object, 0);
6681 } else if (notifier) {
6682 OUR_PMLog(kPMLogClientNotify, (uintptr_t) notifier->handler, 0);
6683 }
6684 }
6685
6686 msgArg.notifyRef = msgRef;
6687 msgArg.maxWaitForReply = 0;
6688
6689 clock_get_uptime(&start);
6690 if (enableTracing) {
6691 getPMRootDomain()->traceNotification(notifier, true, start, msgIndex);
6692 }
6693
6694 retCode = context->us->messageClient(msgType, object, (void *) &msgArg, sizeof(msgArg));
6695
6696 clock_get_uptime(&end);
6697 if (enableTracing) {
6698 getPMRootDomain()->traceNotification(notifier, false, end, msgIndex);
6699 }
6700
6701 if (kIOReturnSuccess == retCode) {
6702 if (0 == msgArg.maxWaitForReply) {
6703 // client doesn't want time to respond
6704 OUR_PMLog(kPMLogClientAcknowledge, msgRef, (uintptr_t) object);
6705 context->responseArray->setObject(msgIndex, replied);
6706 } else {
6707 replied = kOSBooleanFalse;
6708 uint32_t ackTimeRequested = msgArg.maxWaitForReply;
6709 if (msgArg.maxWaitForReply > context->maxTimeRequested) {
6710 if (msgArg.maxWaitForReply > kCapabilityClientMaxWait) {
6711 context->maxTimeRequested = ackTimeRequested = kCapabilityClientMaxWait;
6712 PM_ERROR("%s: client %p returned %u for %s\n",
6713 context->us->getName(),
6714 notifier ? (void *) OBFUSCATE(notifier->handler) : OBFUSCATE(object),
6715 msgArg.maxWaitForReply,
6716 getIOMessageString(msgType));
6717 } else {
6718 context->maxTimeRequested = msgArg.maxWaitForReply;
6719 }
6720 }
6721
6722 // Track acknowledgements by storing the timestamp of
6723 // callback completion and requested ack time.
6724 IOPMClientAck *ackState = new IOPMClientAck;
6725 if (ackState) {
6726 ackState->completionTimestamp = AbsoluteTime_to_scalar(&end);
6727 ackState->maxTimeRequested = ackTimeRequested;
6728 context->responseArray->setObject(msgIndex, ackState);
6729 OSSafeReleaseNULL(ackState);
6730 } else {
6731 context->responseArray->setObject(msgIndex, replied);
6732 }
6733 }
6734
6735 if (enableTracing) {
6736 SUB_ABSOLUTETIME(&end, &start);
6737 absolutetime_to_nanoseconds(end, &nsec);
6738
6739 if ((nsec > LOG_KEXT_RESPONSE_TIMES) || (msgArg.maxWaitForReply != 0)) {
6740 getPMRootDomain()->traceNotificationResponse(notifier, NS_TO_MS(nsec), msgArg.maxWaitForReply);
6741 }
6742 }
6743 } else {
6744 // not a client of ours
6745 // so we won't be waiting for response
6746 OUR_PMLog(kPMLogClientAcknowledge, msgRef, 0);
6747 context->responseArray->setObject(msgIndex, replied);
6748 }
6749 if (context->notifyClients) {
6750 context->notifyClients->setObject(msgIndex, object);
6751 }
6752 }
6753
6754 //*********************************************************************************
6755 // [public] tellNoChangeDown
6756 //
6757 // Notify registered applications and kernel clients that we are not
6758 // dropping power.
6759 //
6760 // Subclass can override this to send a different message type. Parameter is
6761 // the aborted destination state number.
6762 //*********************************************************************************
6763
6764 void
tellNoChangeDown(unsigned long)6765 IOService::tellNoChangeDown( unsigned long )
6766 {
6767 return tellClients( kIOMessageDeviceWillNotPowerOff );
6768 }
6769
6770 //*********************************************************************************
6771 // [public] tellChangeUp
6772 //
6773 // Notify registered applications and kernel clients that we are raising power.
6774 //
6775 // Subclass can override this to send a different message type. Parameter is
6776 // the aborted destination state number.
6777 //*********************************************************************************
6778
6779 void
tellChangeUp(unsigned long)6780 IOService::tellChangeUp( unsigned long )
6781 {
6782 return tellClients( kIOMessageDeviceHasPoweredOn );
6783 }
6784
6785 //*********************************************************************************
6786 // [protected] tellClients
6787 //
6788 // Notify registered applications and kernel clients of something.
6789 //*********************************************************************************
6790
6791 void
tellClients(int messageType)6792 IOService::tellClients( int messageType )
6793 {
6794 IOPMInterestContext context;
6795
6796 RD_LOG("tellClients( %s )\n", getIOMessageString(messageType));
6797
6798 memset(&context, 0, sizeof(context));
6799 context.messageType = messageType;
6800 context.isPreChange = fIsPreChange;
6801 context.us = this;
6802 context.stateNumber = fHeadNotePowerState;
6803 context.stateFlags = fHeadNotePowerArrayEntry->capabilityFlags;
6804 context.changeFlags = fHeadNoteChangeFlags;
6805 context.enableTracing = IS_ROOT_DOMAIN;
6806 context.messageFilter = (IS_ROOT_DOMAIN) ?
6807 OSMemberFunctionCast(
6808 IOPMMessageFilter,
6809 (IOPMrootDomain *)this,
6810 &IOPMrootDomain::systemMessageFilter) : NULL;
6811
6812 context.notifyType = kNotifyPriority;
6813 applyToInterested( gIOPriorityPowerStateInterest,
6814 tellKernelClientApplier, (void *) &context );
6815
6816 context.notifyType = kNotifyApps;
6817 applyToInterested( gIOAppPowerStateInterest,
6818 tellAppClientApplier, (void *) &context );
6819
6820 applyToInterested( gIOGeneralInterest,
6821 tellKernelClientApplier, (void *) &context );
6822 }
6823
6824 //*********************************************************************************
6825 // [private] tellKernelClientApplier
6826 //
6827 // Message a kernel client.
6828 //*********************************************************************************
6829
6830 static void
tellKernelClientApplier(OSObject * object,void * arg)6831 tellKernelClientApplier( OSObject * object, void * arg )
6832 {
6833 IOPowerStateChangeNotification notify;
6834 IOPMInterestContext * context = (IOPMInterestContext *) arg;
6835 bool enableTracing = context->enableTracing;
6836
6837 if (context->messageFilter &&
6838 !context->messageFilter(context->us, object, context, NULL, NULL)) {
6839 IOService::getPMRootDomain()->traceFilteredNotification(object);
6840 return;
6841 }
6842
6843 notify.powerRef = (void *) NULL;
6844 notify.returnValue = 0;
6845 notify.stateNumber = context->stateNumber;
6846 notify.stateFlags = context->stateFlags;
6847
6848 if (enableTracing) {
6849 IOService::getPMRootDomain()->traceNotification(object, true);
6850 }
6851
6852 context->us->messageClient(context->messageType, object, ¬ify, sizeof(notify));
6853
6854 if (enableTracing) {
6855 IOService::getPMRootDomain()->traceNotification(object, false);
6856 }
6857 }
6858
6859 static OSNumber *
copyClientIDForNotification(OSObject * object,IOPMInterestContext * context)6860 copyClientIDForNotification(
6861 OSObject *object,
6862 IOPMInterestContext *context)
6863 {
6864 OSNumber *clientID = NULL;
6865 context->us->messageClient(kIOMessageCopyClientID, object, &clientID);
6866 return clientID;
6867 }
6868
6869 static void
logClientIDForNotification(OSObject * object,IOPMInterestContext * context,const char * logString)6870 logClientIDForNotification(
6871 OSObject *object,
6872 IOPMInterestContext *context,
6873 const char *logString)
6874 {
6875 OSString *logClientID = NULL;
6876 OSNumber *clientID = copyClientIDForNotification(object, context);
6877
6878 if (logString) {
6879 if (clientID) {
6880 logClientID = IOCopyLogNameForPID(clientID->unsigned32BitValue());
6881 }
6882
6883 PM_LOG("%s %s %s, %s\n",
6884 context->us->getName(), logString,
6885 IOService::getIOMessageString(context->messageType),
6886 logClientID ? logClientID->getCStringNoCopy() : "");
6887
6888 if (logClientID) {
6889 logClientID->release();
6890 }
6891 }
6892
6893 if (clientID) {
6894 clientID->release();
6895 }
6896
6897 return;
6898 }
6899
6900 static void
tellAppClientApplier(OSObject * object,void * arg)6901 tellAppClientApplier( OSObject * object, void * arg )
6902 {
6903 IOPMInterestContext * context = (IOPMInterestContext *) arg;
6904 OSNumber * clientID = NULL;
6905 proc_t proc = NULL;
6906 boolean_t proc_suspended = FALSE;
6907
6908 if (context->us == IOService::getPMRootDomain()) {
6909 if ((clientID = copyClientIDForNotification(object, context))) {
6910 uint32_t clientPID = clientID->unsigned32BitValue();
6911 clientID->release();
6912 proc = proc_find(clientPID);
6913
6914 if (proc) {
6915 proc_suspended = get_task_pidsuspended((task_t) proc_task(proc));
6916 if (proc_suspended) {
6917 logClientIDForNotification(object, context, "tellAppClientApplier - Suspended");
6918 } else if (IOService::getPMRootDomain()->isAOTMode() && get_task_suspended((task_t) proc_task(proc))) {
6919 proc_suspended = true;
6920 context->skippedInDark++;
6921 }
6922 proc_rele(proc);
6923 if (proc_suspended) {
6924 return;
6925 }
6926 }
6927 }
6928 }
6929
6930 if (context->messageFilter &&
6931 !context->messageFilter(context->us, object, context, NULL, NULL)) {
6932 if (kIOLogDebugPower & gIOKitDebug) {
6933 logClientIDForNotification(object, context, "DROP App");
6934 }
6935 return;
6936 }
6937 context->notSkippedInDark++;
6938
6939 if (kIOLogDebugPower & gIOKitDebug) {
6940 logClientIDForNotification(object, context, "MESG App");
6941 }
6942
6943 context->us->messageClient(context->messageType, object, NULL);
6944 }
6945
6946 //*********************************************************************************
6947 // [private] checkForDone
6948 //*********************************************************************************
6949
6950 bool
checkForDone(void)6951 IOService::checkForDone( void )
6952 {
6953 int i = 0;
6954 OSObject * theFlag;
6955
6956 if (fResponseArray == NULL) {
6957 return true;
6958 }
6959
6960 for (i = 0;; i++) {
6961 theFlag = fResponseArray->getObject(i);
6962
6963 if (NULL == theFlag) {
6964 break;
6965 }
6966
6967 if (kOSBooleanTrue != theFlag) {
6968 return false;
6969 }
6970 }
6971 return true;
6972 }
6973
6974 //*********************************************************************************
6975 // [public] responseValid
6976 //*********************************************************************************
6977
6978 bool
responseValid(uint32_t refcon,int pid)6979 IOService::responseValid( uint32_t refcon, int pid )
6980 {
6981 UInt16 serialComponent;
6982 UInt16 ordinalComponent;
6983 OSObject * theFlag;
6984 OSObject *object = NULL;
6985
6986 serialComponent = (refcon >> 16) & 0xFFFF;
6987 ordinalComponent = (refcon & 0xFFFF);
6988
6989 if (serialComponent != fSerialNumber) {
6990 return false;
6991 }
6992
6993 if (fResponseArray == NULL) {
6994 return false;
6995 }
6996
6997 theFlag = fResponseArray->getObject(ordinalComponent);
6998
6999 if (theFlag == NULL) {
7000 return false;
7001 }
7002
7003 if (fNotifyClientArray) {
7004 object = fNotifyClientArray->getObject(ordinalComponent);
7005 }
7006
7007 OSNumber * num;
7008 IOPMClientAck *ack;
7009 if ((num = OSDynamicCast(OSNumber, theFlag)) || (ack = OSDynamicCast(IOPMClientAck, theFlag))) {
7010 AbsoluteTime now;
7011 AbsoluteTime start;
7012 uint64_t nsec;
7013 char name[128];
7014
7015 clock_get_uptime(&now);
7016 AbsoluteTime_to_scalar(&start) = num ? num->unsigned64BitValue() : ack->completionTimestamp;
7017 SUB_ABSOLUTETIME(&now, &start);
7018 absolutetime_to_nanoseconds(now, &nsec);
7019
7020 if (pid != 0) {
7021 name[0] = '\0';
7022 proc_name(pid, name, sizeof(name));
7023
7024 if (nsec > LOG_APP_RESPONSE_TIMES) {
7025 IOLog("PM response took %d ms (%d, %s)\n", NS_TO_MS(nsec),
7026 pid, name);
7027 }
7028
7029 if (nsec > LOG_APP_RESPONSE_MSG_TRACER) {
7030 // TODO: populate the messageType argument
7031 getPMRootDomain()->pmStatsRecordApplicationResponse(
7032 gIOPMStatsResponseSlow,
7033 name, 0, NS_TO_MS(nsec), pid, object);
7034 } else {
7035 getPMRootDomain()->pmStatsRecordApplicationResponse(
7036 gIOPMStatsResponsePrompt,
7037 name, 0, NS_TO_MS(nsec), pid, object);
7038 }
7039 } else {
7040 getPMRootDomain()->traceNotificationAck(object, NS_TO_MS(nsec));
7041 }
7042
7043 if (kIOLogDebugPower & gIOKitDebug) {
7044 PM_LOG("Ack(%u) %u ms\n",
7045 (uint32_t) ordinalComponent,
7046 NS_TO_MS(nsec));
7047 }
7048 theFlag = kOSBooleanFalse;
7049 } else if (object) {
7050 getPMRootDomain()->pmStatsRecordApplicationResponse(
7051 gIOPMStatsResponsePrompt,
7052 NULL, 0, 0, pid, object);
7053 }
7054
7055 if (kOSBooleanFalse == theFlag) {
7056 fResponseArray->replaceObject(ordinalComponent, kOSBooleanTrue);
7057 }
7058
7059 return true;
7060 }
7061
7062 //*********************************************************************************
7063 // [private] updateClientResponses
7064 //
7065 // Only affects clients informed in pmTellClientWithResponse() and
7066 // pmTellCapabilityClientWithResponse().
7067 //
7068 // Called upon every client acknowledgement to scan through the response array and
7069 // update the ack timer based on which clients have yet to acknowledge the power
7070 // change. If a client hasn't acknowledged by their requested time, make sure not
7071 // to wait on that client.
7072 //*********************************************************************************
7073
7074 OSDefineMetaClassAndStructors( IOPMClientAck, OSObject );
7075
7076 void
updateClientResponses(void)7077 IOService::updateClientResponses( void )
7078 {
7079 int i = 0;
7080 uint32_t maxTimeToAckMS = 0;
7081 bool editTimer = false;
7082 OSObject *obj;
7083 IOPMClientAck *ack;
7084
7085 for (i = 0;; i++) {
7086 obj = fResponseArray->getObject(i);
7087 if (obj == NULL) {
7088 break;
7089 }
7090
7091 // IOPMClientAck is used for pmTellClientWithResponse and
7092 // pmTellCapabilityClientWithResponse, no-op otherwise
7093 if ((ack = OSDynamicCast(IOPMClientAck, obj))) {
7094 AbsoluteTime now;
7095 AbsoluteTime start;
7096 uint64_t nsec;
7097 uint64_t timeRequestedNS = ack->maxTimeRequested * NSEC_PER_USEC;
7098
7099 editTimer = true;
7100
7101 // Calculate time since completion
7102 clock_get_uptime(&now);
7103 AbsoluteTime_to_scalar(&start) = ack->completionTimestamp;
7104 SUB_ABSOLUTETIME(&now, &start);
7105 absolutetime_to_nanoseconds(now, &nsec);
7106 if (nsec >= timeRequestedNS) {
7107 // Tardy; do not wait for this client
7108 fResponseArray->replaceObject(i, kOSBooleanTrue);
7109 } else {
7110 // Calculate time left to ack
7111 uint32_t timeToAckMS = NS_TO_MS(timeRequestedNS - nsec);
7112 maxTimeToAckMS = timeToAckMS > maxTimeToAckMS ? timeToAckMS : maxTimeToAckMS;
7113 }
7114 }
7115 }
7116
7117 if (editTimer) {
7118 // Reset ack timer, but leave the PM watchdog set at the max client request
7119 // time.
7120 RD_LOG("resetting ack timer to %u ms\n", maxTimeToAckMS);
7121 stop_ack_timer();
7122 start_ack_timer(maxTimeToAckMS, kMillisecondScale);
7123 }
7124 }
7125
7126 //*********************************************************************************
7127 // [public] allowPowerChange
7128 //
7129 // Our power state is about to lower, and we have notified applications
7130 // and kernel clients, and one of them has acknowledged. If this is the last to do
7131 // so, and all acknowledgements are positive, we continue with the power change.
7132 //*********************************************************************************
7133
7134 IOReturn
allowPowerChange(unsigned long refcon)7135 IOService::allowPowerChange( unsigned long refcon )
7136 {
7137 IOPMRequest * request;
7138
7139 if (!initialized) {
7140 // we're unloading
7141 return kIOReturnSuccess;
7142 }
7143
7144 request = acquirePMRequest( this, kIOPMRequestTypeAllowPowerChange );
7145 if (!request) {
7146 return kIOReturnNoMemory;
7147 }
7148
7149 request->fArg0 = (void *) refcon;
7150 request->fArg1 = (void *)(uintptr_t) proc_selfpid();
7151 request->fArg2 = (void *) NULL;
7152 submitPMRequest( request );
7153
7154 return kIOReturnSuccess;
7155 }
7156
7157 #ifndef __LP64__
7158 IOReturn
serializedAllowPowerChange2(unsigned long refcon)7159 IOService::serializedAllowPowerChange2( unsigned long refcon )
7160 {
7161 // [deprecated] public
7162 return kIOReturnUnsupported;
7163 }
7164 #endif /* !__LP64__ */
7165
7166 //*********************************************************************************
7167 // [public] cancelPowerChange
7168 //
7169 // Our power state is about to lower, and we have notified applications
7170 // and kernel clients, and one of them has vetoed the change. If this is the last
7171 // client to respond, we abandon the power change.
7172 //*********************************************************************************
7173
7174 IOReturn
cancelPowerChange(unsigned long refcon)7175 IOService::cancelPowerChange( unsigned long refcon )
7176 {
7177 IOPMRequest * request;
7178 char name[128];
7179 pid_t pid = proc_selfpid();
7180
7181 if (!initialized) {
7182 // we're unloading
7183 return kIOReturnSuccess;
7184 }
7185
7186 name[0] = '\0';
7187 proc_name(pid, name, sizeof(name));
7188 if (pid == 0) {
7189 const char *serviceName = this->getName();
7190 size_t len = strlen(name);
7191 snprintf(name + len, sizeof(name) - len, " (%s)", serviceName ? serviceName : "");
7192 }
7193 PM_ERROR("PM notification cancel (pid %d, %s)\n", pid, name);
7194
7195 request = acquirePMRequest( this, kIOPMRequestTypeCancelPowerChange );
7196 if (!request) {
7197 return kIOReturnNoMemory;
7198 }
7199
7200 request->fArg0 = (void *) refcon;
7201 request->fArg1 = (void *)(uintptr_t) proc_selfpid();
7202 request->fArg2 = (void *) OSString::withCString(name);
7203 submitPMRequest( request );
7204
7205 return kIOReturnSuccess;
7206 }
7207
7208 //*********************************************************************************
7209 // cancelIdlePowerDown
7210 //
7211 // Internal method to trigger an idle cancel or revert
7212 //*********************************************************************************
7213
7214 void
cancelIdlePowerDown(IOService * service)7215 IOService::cancelIdlePowerDown( IOService * service )
7216 {
7217 IOPMRequest * request;
7218
7219 request = acquirePMRequest(service, kIOPMRequestTypeIdleCancel);
7220 if (request) {
7221 submitPMRequest(request);
7222 }
7223 }
7224
7225 //*********************************************************************************
7226 // cancelIdlePowerDownSync
7227 //
7228 // Internal method to cancel sleep synchronously to avoid races on power down path
7229 //*********************************************************************************
7230
7231 void
cancelIdlePowerDownSync(void)7232 IOService::cancelIdlePowerDownSync( void )
7233 {
7234 handleCancelIdlePowerDown();
7235 }
7236
7237
7238 //*********************************************************************************
7239 // [private] handleCancelIdlePowerDown
7240 //*********************************************************************************
7241
7242 bool
handleCancelIdlePowerDown(void)7243 IOService::handleCancelIdlePowerDown( void )
7244 {
7245 bool more = false;
7246 if ((fMachineState == kIOPM_OurChangeTellClientsPowerDown)
7247 || (fMachineState == kIOPM_OurChangeTellUserPMPolicyPowerDown)
7248 || (fMachineState == kIOPM_OurChangeTellPriorityClientsPowerDown)
7249 || (fMachineState == kIOPM_SyncTellClientsPowerDown)
7250 || (fMachineState == kIOPM_SyncTellPriorityClientsPowerDown)) {
7251 OUR_PMLog(kPMLogIdleCancel, (uintptr_t) this, fMachineState);
7252 PM_LOG2("%s: cancel from machine state %d\n",
7253 getName(), fMachineState);
7254 fDoNotPowerDown = true;
7255 // Stop waiting for app replys.
7256 if ((fMachineState == kIOPM_OurChangeTellPriorityClientsPowerDown) ||
7257 (fMachineState == kIOPM_OurChangeTellUserPMPolicyPowerDown) ||
7258 (fMachineState == kIOPM_SyncTellPriorityClientsPowerDown) ||
7259 (fMachineState == kIOPM_SyncTellClientsPowerDown)) {
7260 cleanClientResponses(false);
7261 }
7262 more = true;
7263 }
7264 return more;
7265 }
7266
7267 #ifndef __LP64__
7268 IOReturn
serializedCancelPowerChange2(unsigned long refcon)7269 IOService::serializedCancelPowerChange2( unsigned long refcon )
7270 {
7271 // [deprecated] public
7272 return kIOReturnUnsupported;
7273 }
7274
7275 //*********************************************************************************
7276 // PM_Clamp_Timer_Expired
7277 //
7278 // called when clamp timer expires...set power state to 0.
7279 //*********************************************************************************
7280
7281 void
PM_Clamp_Timer_Expired(void)7282 IOService::PM_Clamp_Timer_Expired( void )
7283 {
7284 }
7285
7286 //*********************************************************************************
7287 // clampPowerOn
7288 //
7289 // Set to highest available power state for a minimum of duration milliseconds
7290 //*********************************************************************************
7291
7292 void
clampPowerOn(unsigned long duration)7293 IOService::clampPowerOn( unsigned long duration )
7294 {
7295 }
7296 #endif /* !__LP64__ */
7297
7298 //*********************************************************************************
7299 // configurePowerStateReport
7300 //
7301 // Configures the IOStateReport for kPMPowerStateChannel
7302 //*********************************************************************************
7303 IOReturn
configurePowerStatesReport(IOReportConfigureAction action,void * result)7304 IOService::configurePowerStatesReport( IOReportConfigureAction action, void *result )
7305 {
7306 IOReturn rc = kIOReturnSuccess;
7307 size_t reportSize;
7308 unsigned long i;
7309 uint64_t ts;
7310
7311 if (!pwrMgt) {
7312 return kIOReturnUnsupported;
7313 }
7314
7315 if (!fNumberOfPowerStates) {
7316 return kIOReturnSuccess; // For drivers which are in power plane, but haven't called registerPowerDriver()
7317 }
7318
7319 if (fNumberOfPowerStates > INT16_MAX) {
7320 return kIOReturnOverrun;
7321 }
7322 PM_LOCK();
7323
7324 switch (action) {
7325 case kIOReportEnable:
7326 if (fReportBuf) {
7327 fReportClientCnt++;
7328 break;
7329 }
7330 reportSize = STATEREPORT_BUFSIZE(fNumberOfPowerStates);
7331 fReportBuf = IOMallocZeroData(reportSize);
7332 if (!fReportBuf) {
7333 rc = kIOReturnNoMemory;
7334 break;
7335 }
7336
7337 STATEREPORT_INIT((uint16_t) fNumberOfPowerStates, fReportBuf, reportSize,
7338 getRegistryEntryID(), kPMPowerStatesChID, kIOReportCategoryPower);
7339
7340 for (i = 0; i < fNumberOfPowerStates; i++) {
7341 unsigned bits = 0;
7342
7343 if (fPowerStates[i].capabilityFlags & kIOPMPowerOn) {
7344 bits |= kPMReportPowerOn;
7345 }
7346 if (fPowerStates[i].capabilityFlags & kIOPMDeviceUsable) {
7347 bits |= kPMReportDeviceUsable;
7348 }
7349 if (fPowerStates[i].capabilityFlags & kIOPMLowPower) {
7350 bits |= kPMReportLowPower;
7351 }
7352
7353 STATEREPORT_SETSTATEID(fReportBuf, i, ((bits & 0xff) << 8) |
7354 ((StateOrder(fMaxPowerState) & 0xf) << 4) | (StateOrder(i) & 0xf));
7355 }
7356 ts = mach_absolute_time();
7357 STATEREPORT_SETSTATE(fReportBuf, (uint16_t) fCurrentPowerState, ts);
7358 break;
7359
7360 case kIOReportDisable:
7361 if (fReportClientCnt == 0) {
7362 rc = kIOReturnBadArgument;
7363 break;
7364 }
7365 if (fReportClientCnt == 1) {
7366 IOFreeData(fReportBuf, STATEREPORT_BUFSIZE(fNumberOfPowerStates));
7367 fReportBuf = NULL;
7368 }
7369 fReportClientCnt--;
7370 break;
7371
7372 case kIOReportGetDimensions:
7373 if (fReportBuf) {
7374 STATEREPORT_UPDATERES(fReportBuf, kIOReportGetDimensions, result);
7375 }
7376 break;
7377 }
7378
7379 PM_UNLOCK();
7380
7381 return rc;
7382 }
7383
7384 //*********************************************************************************
7385 // updatePowerStateReport
7386 //
7387 // Updates the IOStateReport for kPMPowerStateChannel
7388 //*********************************************************************************
7389 IOReturn
updatePowerStatesReport(IOReportConfigureAction action,void * result,void * destination)7390 IOService::updatePowerStatesReport( IOReportConfigureAction action, void *result, void *destination )
7391 {
7392 uint32_t size2cpy;
7393 void *data2cpy;
7394 uint64_t ts;
7395 IOReturn rc = kIOReturnSuccess;
7396 IOBufferMemoryDescriptor *dest = OSDynamicCast(IOBufferMemoryDescriptor, (OSObject *)destination);
7397
7398
7399 if (!pwrMgt) {
7400 return kIOReturnUnsupported;
7401 }
7402 if (!fNumberOfPowerStates) {
7403 return kIOReturnSuccess;
7404 }
7405
7406 if (!result || !dest) {
7407 return kIOReturnBadArgument;
7408 }
7409 PM_LOCK();
7410
7411 switch (action) {
7412 case kIOReportCopyChannelData:
7413 if (!fReportBuf) {
7414 rc = kIOReturnNotOpen;
7415 break;
7416 }
7417
7418 ts = mach_absolute_time();
7419 STATEREPORT_UPDATEPREP(fReportBuf, ts, data2cpy, size2cpy);
7420 if (size2cpy > (dest->getCapacity() - dest->getLength())) {
7421 rc = kIOReturnOverrun;
7422 break;
7423 }
7424
7425 STATEREPORT_UPDATERES(fReportBuf, kIOReportCopyChannelData, result);
7426 dest->appendBytes(data2cpy, size2cpy);
7427 break;
7428
7429 default:
7430 break;
7431 }
7432
7433 PM_UNLOCK();
7434
7435 return rc;
7436 }
7437
7438 //*********************************************************************************
7439 // configureSimplePowerReport
7440 //
7441 // Configures the IOSimpleReport for given channel id
7442 //*********************************************************************************
7443 IOReturn
configureSimplePowerReport(IOReportConfigureAction action,void * result)7444 IOService::configureSimplePowerReport(IOReportConfigureAction action, void *result )
7445 {
7446 IOReturn rc = kIOReturnSuccess;
7447
7448 if (!pwrMgt) {
7449 return kIOReturnUnsupported;
7450 }
7451
7452 if (!fNumberOfPowerStates) {
7453 return rc;
7454 }
7455
7456 switch (action) {
7457 case kIOReportEnable:
7458 case kIOReportDisable:
7459 break;
7460
7461 case kIOReportGetDimensions:
7462 SIMPLEREPORT_UPDATERES(kIOReportGetDimensions, result);
7463 break;
7464 }
7465
7466
7467 return rc;
7468 }
7469
7470 //*********************************************************************************
7471 // updateSimplePowerReport
7472 //
7473 // Updates the IOSimpleReport for the given chanel id
7474 //*********************************************************************************
7475 IOReturn
updateSimplePowerReport(IOReportConfigureAction action,void * result,void * destination)7476 IOService::updateSimplePowerReport( IOReportConfigureAction action, void *result, void *destination )
7477 {
7478 uint32_t size2cpy;
7479 void *data2cpy;
7480 uint64_t buf[SIMPLEREPORT_BUFSIZE / sizeof(uint64_t) + 1]; // Force a 8-byte alignment
7481 IOBufferMemoryDescriptor *dest = OSDynamicCast(IOBufferMemoryDescriptor, (OSObject *)destination);
7482 IOReturn rc = kIOReturnSuccess;
7483 unsigned bits = 0;
7484
7485
7486 if (!pwrMgt) {
7487 return kIOReturnUnsupported;
7488 }
7489 if (!result || !dest) {
7490 return kIOReturnBadArgument;
7491 }
7492
7493 if (!fNumberOfPowerStates) {
7494 return rc;
7495 }
7496 PM_LOCK();
7497
7498 switch (action) {
7499 case kIOReportCopyChannelData:
7500
7501 SIMPLEREPORT_INIT(buf, sizeof(buf), getRegistryEntryID(), kPMCurrStateChID, kIOReportCategoryPower);
7502
7503 if (fPowerStates[fCurrentPowerState].capabilityFlags & kIOPMPowerOn) {
7504 bits |= kPMReportPowerOn;
7505 }
7506 if (fPowerStates[fCurrentPowerState].capabilityFlags & kIOPMDeviceUsable) {
7507 bits |= kPMReportDeviceUsable;
7508 }
7509 if (fPowerStates[fCurrentPowerState].capabilityFlags & kIOPMLowPower) {
7510 bits |= kPMReportLowPower;
7511 }
7512
7513
7514 SIMPLEREPORT_SETVALUE(buf, ((bits & 0xff) << 8) | ((StateOrder(fMaxPowerState) & 0xf) << 4) |
7515 (StateOrder(fCurrentPowerState) & 0xf));
7516
7517 SIMPLEREPORT_UPDATEPREP(buf, data2cpy, size2cpy);
7518 if (size2cpy > (dest->getCapacity() - dest->getLength())) {
7519 rc = kIOReturnOverrun;
7520 break;
7521 }
7522
7523 SIMPLEREPORT_UPDATERES(kIOReportCopyChannelData, result);
7524 dest->appendBytes(data2cpy, size2cpy);
7525 break;
7526
7527 default:
7528 break;
7529 }
7530
7531 PM_UNLOCK();
7532
7533 return rc;
7534 }
7535
7536
7537
7538 // MARK: -
7539 // MARK: Driver Overrides
7540
7541 //*********************************************************************************
7542 // [public] setPowerState
7543 //
7544 // Does nothing here. This should be implemented in a subclass driver.
7545 //*********************************************************************************
7546
7547 IOReturn
setPowerState(unsigned long powerStateOrdinal,IOService * whatDevice)7548 IOService::setPowerState(
7549 unsigned long powerStateOrdinal, IOService * whatDevice )
7550 {
7551 return IOPMNoErr;
7552 }
7553
7554 //*********************************************************************************
7555 // [public] maxCapabilityForDomainState
7556 //
7557 // Finds the highest power state in the array whose input power requirement
7558 // is equal to the input parameter. Where a more intelligent decision is
7559 // possible, override this in the subclassed driver.
7560 //*********************************************************************************
7561
7562 IOPMPowerStateIndex
getPowerStateForDomainFlags(IOPMPowerFlags flags)7563 IOService::getPowerStateForDomainFlags( IOPMPowerFlags flags )
7564 {
7565 IOPMPowerStateIndex stateIndex;
7566
7567 if (!fNumberOfPowerStates) {
7568 return kPowerStateZero;
7569 }
7570
7571 for (long order = fNumberOfPowerStates - 1; order >= 0; order--) {
7572 stateIndex = fPowerStates[order].stateOrderToIndex;
7573
7574 if ((flags & fPowerStates[stateIndex].inputPowerFlags) ==
7575 fPowerStates[stateIndex].inputPowerFlags) {
7576 return stateIndex;
7577 }
7578 }
7579 return kPowerStateZero;
7580 }
7581
7582 unsigned long
maxCapabilityForDomainState(IOPMPowerFlags domainState)7583 IOService::maxCapabilityForDomainState( IOPMPowerFlags domainState )
7584 {
7585 return getPowerStateForDomainFlags(domainState);
7586 }
7587
7588 unsigned long
driverMaxCapabilityForDomainState(IOPMPowerFlags domainState)7589 IOService::driverMaxCapabilityForDomainState( IOPMPowerFlags domainState )
7590 {
7591 IOPMDriverCallEntry callEntry;
7592 IOPMPowerStateIndex powerState = kPowerStateZero;
7593
7594 if (assertPMDriverCall(&callEntry, kIOPMDriverCallMethodMaxCapabilityForDomainState)) {
7595 powerState = maxCapabilityForDomainState(domainState);
7596 deassertPMDriverCall(&callEntry);
7597 }
7598 return powerState;
7599 }
7600
7601 //*********************************************************************************
7602 // [public] initialPowerStateForDomainState
7603 //
7604 // Called to query the power state for the initial power transition.
7605 //*********************************************************************************
7606
7607 unsigned long
initialPowerStateForDomainState(IOPMPowerFlags domainState)7608 IOService::initialPowerStateForDomainState( IOPMPowerFlags domainState )
7609 {
7610 if (fResetPowerStateOnWake && (domainState & kIOPMRootDomainState)) {
7611 // Return lowest power state for any root power domain changes
7612 return kPowerStateZero;
7613 }
7614
7615 return getPowerStateForDomainFlags(domainState);
7616 }
7617
7618 unsigned long
driverInitialPowerStateForDomainState(IOPMPowerFlags domainState)7619 IOService::driverInitialPowerStateForDomainState( IOPMPowerFlags domainState )
7620 {
7621 IOPMDriverCallEntry callEntry;
7622 IOPMPowerStateIndex powerState = kPowerStateZero;
7623
7624 if (assertPMDriverCall(&callEntry, kIOPMDriverCallMethodInitialPowerStateForDomainState)) {
7625 powerState = initialPowerStateForDomainState(domainState);
7626 deassertPMDriverCall(&callEntry);
7627 }
7628 return powerState;
7629 }
7630
7631 //*********************************************************************************
7632 // [public] powerStateForDomainState
7633 //
7634 // This method is not called from PM.
7635 //*********************************************************************************
7636
7637 unsigned long
powerStateForDomainState(IOPMPowerFlags domainState)7638 IOService::powerStateForDomainState( IOPMPowerFlags domainState )
7639 {
7640 return getPowerStateForDomainFlags(domainState);
7641 }
7642
7643 #ifndef __LP64__
7644 //*********************************************************************************
7645 // [deprecated] didYouWakeSystem
7646 //
7647 // Does nothing here. This should be implemented in a subclass driver.
7648 //*********************************************************************************
7649
7650 bool
didYouWakeSystem(void)7651 IOService::didYouWakeSystem( void )
7652 {
7653 return false;
7654 }
7655 #endif /* !__LP64__ */
7656
7657 //*********************************************************************************
7658 // [public] powerStateWillChangeTo
7659 //
7660 // Does nothing here. This should be implemented in a subclass driver.
7661 //*********************************************************************************
7662
7663 IOReturn
powerStateWillChangeTo(IOPMPowerFlags,unsigned long,IOService *)7664 IOService::powerStateWillChangeTo( IOPMPowerFlags, unsigned long, IOService * )
7665 {
7666 return kIOPMAckImplied;
7667 }
7668
7669 //*********************************************************************************
7670 // [public] powerStateDidChangeTo
7671 //
7672 // Does nothing here. This should be implemented in a subclass driver.
7673 //*********************************************************************************
7674
7675 IOReturn
powerStateDidChangeTo(IOPMPowerFlags,unsigned long,IOService *)7676 IOService::powerStateDidChangeTo( IOPMPowerFlags, unsigned long, IOService * )
7677 {
7678 return kIOPMAckImplied;
7679 }
7680
7681 //*********************************************************************************
7682 // [protected] powerChangeDone
7683 //
7684 // Called from PM work loop thread.
7685 // Does nothing here. This should be implemented in a subclass policy-maker.
7686 //*********************************************************************************
7687
7688 void
powerChangeDone(unsigned long)7689 IOService::powerChangeDone( unsigned long )
7690 {
7691 }
7692
7693 #ifndef __LP64__
7694 //*********************************************************************************
7695 // [deprecated] newTemperature
7696 //
7697 // Does nothing here. This should be implemented in a subclass driver.
7698 //*********************************************************************************
7699
7700 IOReturn
newTemperature(long currentTemp,IOService * whichZone)7701 IOService::newTemperature( long currentTemp, IOService * whichZone )
7702 {
7703 return IOPMNoErr;
7704 }
7705 #endif /* !__LP64__ */
7706
7707 //*********************************************************************************
7708 // [public] systemWillShutdown
7709 //
7710 // System shutdown and restart notification.
7711 //*********************************************************************************
7712
7713 void
systemWillShutdown(IOOptionBits specifier)7714 IOService::systemWillShutdown( IOOptionBits specifier )
7715 {
7716 IOPMrootDomain * rootDomain = IOService::getPMRootDomain();
7717 if (rootDomain) {
7718 rootDomain->acknowledgeSystemWillShutdown( this );
7719 }
7720 }
7721
7722 // MARK: -
7723 // MARK: PM State Machine
7724
7725 //*********************************************************************************
7726 // [private static] acquirePMRequest
7727 //*********************************************************************************
7728
7729 IOPMRequest *
acquirePMRequest(IOService * target,IOOptionBits requestType,IOPMRequest * active)7730 IOService::acquirePMRequest( IOService * target, IOOptionBits requestType,
7731 IOPMRequest * active )
7732 {
7733 IOPMRequest * request;
7734
7735 assert(target);
7736
7737 request = IOPMRequest::create();
7738 if (request) {
7739 request->init( target, requestType );
7740 if (active) {
7741 IOPMRequest * root = active->getRootRequest();
7742 if (root) {
7743 request->attachRootRequest(root);
7744 }
7745 }
7746 } else {
7747 PM_ERROR("%s: No memory for PM request type 0x%x\n",
7748 target->getName(), (uint32_t) requestType);
7749 }
7750 return request;
7751 }
7752
7753 //*********************************************************************************
7754 // [private static] releasePMRequest
7755 //*********************************************************************************
7756
7757 void
releasePMRequest(IOPMRequest * request)7758 IOService::releasePMRequest( IOPMRequest * request )
7759 {
7760 if (request) {
7761 request->reset();
7762 request->release();
7763 }
7764 }
7765
7766 //*********************************************************************************
7767 // [private static] submitPMRequest
7768 //*********************************************************************************
7769
7770 void
submitPMRequest(IOPMRequest * request)7771 IOService::submitPMRequest( IOPMRequest * request )
7772 {
7773 assert( request );
7774 assert( gIOPMReplyQueue );
7775 assert( gIOPMRequestQueue );
7776
7777 PM_LOG1("[+ %02lx] %p [%p %s] %p %p %p\n",
7778 (long)request->getType(), OBFUSCATE(request),
7779 OBFUSCATE(request->getTarget()), request->getTarget()->getName(),
7780 OBFUSCATE(request->fArg0),
7781 OBFUSCATE(request->fArg1), OBFUSCATE(request->fArg2));
7782
7783 if (request->isReplyType()) {
7784 gIOPMReplyQueue->queuePMRequest( request );
7785 } else {
7786 gIOPMRequestQueue->queuePMRequest( request );
7787 }
7788 }
7789
7790 void
submitPMRequests(IOPMRequest ** requests,IOItemCount count)7791 IOService::submitPMRequests( IOPMRequest ** requests, IOItemCount count )
7792 {
7793 assert( requests );
7794 assert( count > 0 );
7795 assert( gIOPMRequestQueue );
7796
7797 for (IOItemCount i = 0; i < count; i++) {
7798 IOPMRequest * req = requests[i];
7799 PM_LOG1("[+ %02lx] %p [%p %s] %p %p %p\n",
7800 (long)req->getType(), OBFUSCATE(req),
7801 OBFUSCATE(req->getTarget()), req->getTarget()->getName(),
7802 OBFUSCATE(req->fArg0),
7803 OBFUSCATE(req->fArg1), OBFUSCATE(req->fArg2));
7804 }
7805
7806 gIOPMRequestQueue->queuePMRequestChain( requests, count );
7807 }
7808
7809 //*********************************************************************************
7810 // [private] actionPMRequestQueue
7811 //
7812 // IOPMRequestQueue::checkForWork() passing a new request to the request target.
7813 //*********************************************************************************
7814
7815 bool
actionPMRequestQueue(IOPMRequest * request,IOPMRequestQueue * queue)7816 IOService::actionPMRequestQueue(
7817 IOPMRequest * request,
7818 IOPMRequestQueue * queue )
7819 {
7820 bool more;
7821
7822 if (initialized) {
7823 // Work queue will immediately execute the request if the per-service
7824 // request queue is empty. Note pwrMgt is the target's IOServicePM.
7825
7826 more = gIOPMWorkQueue->queuePMRequest(request, pwrMgt);
7827 } else {
7828 // Calling PM without PMinit() is not allowed, fail the request.
7829 // Need to signal more when completing attached requests.
7830
7831 PM_LOG("%s: PM not initialized\n", getName());
7832 PM_LOG1("[- %02x] %p [%p %s] !initialized\n",
7833 request->getType(), OBFUSCATE(request),
7834 OBFUSCATE(this), getName());
7835
7836 more = gIOPMCompletionQueue->queuePMRequest(request);
7837 if (more) {
7838 gIOPMWorkQueue->incrementProducerCount();
7839 }
7840 }
7841
7842 return more;
7843 }
7844
7845 //*********************************************************************************
7846 // [private] actionPMCompletionQueue
7847 //
7848 // IOPMCompletionQueue::checkForWork() passing a completed request to the
7849 // request target.
7850 //*********************************************************************************
7851
7852 bool
actionPMCompletionQueue(IOPMRequest * request,IOPMCompletionQueue * queue)7853 IOService::actionPMCompletionQueue(
7854 IOPMRequest * request,
7855 IOPMCompletionQueue * queue )
7856 {
7857 bool more = (request->getNextRequest() != NULL);
7858 IOPMRequest * root = request->getRootRequest();
7859
7860 if (root && (root != request)) {
7861 more = true;
7862 }
7863 if (more) {
7864 gIOPMWorkQueue->incrementProducerCount();
7865 }
7866
7867 releasePMRequest( request );
7868 return more;
7869 }
7870
7871 //*********************************************************************************
7872 // [private] actionPMWorkQueueRetire
7873 //
7874 // IOPMWorkQueue::checkForWork() passing a retired request to the request target.
7875 //*********************************************************************************
7876
7877 bool
actionPMWorkQueueRetire(IOPMRequest * request,IOPMWorkQueue * queue)7878 IOService::actionPMWorkQueueRetire( IOPMRequest * request, IOPMWorkQueue * queue )
7879 {
7880 assert(request && queue);
7881
7882 PM_LOG1("[- %02x] %p [%p %s] state %d, busy %d\n",
7883 request->getType(), OBFUSCATE(request),
7884 OBFUSCATE(this), getName(),
7885 fMachineState, gIOPMBusyRequestCount);
7886
7887 // Catch requests created by idleTimerExpired()
7888 if (request->getType() == kIOPMRequestTypeActivityTickle) {
7889 uint32_t tickleFlags = (uint32_t)(uintptr_t) request->fArg1;
7890
7891 if ((tickleFlags & kTickleTypePowerDrop) && fIdleTimerPeriod) {
7892 restartIdleTimer();
7893 } else if (tickleFlags == (kTickleTypeActivity | kTickleTypePowerRise)) {
7894 // Invalidate any idle power drop that got queued while
7895 // processing this request.
7896 fIdleTimerGeneration++;
7897 }
7898 }
7899
7900 // When the completed request is linked, tell work queue there is
7901 // more work pending.
7902
7903 return gIOPMCompletionQueue->queuePMRequest( request );
7904 }
7905
7906 //*********************************************************************************
7907 // [private] isPMBlocked
7908 //
7909 // Check if machine state transition is blocked.
7910 //*********************************************************************************
7911
7912 bool
isPMBlocked(IOPMRequest * request,int count)7913 IOService::isPMBlocked( IOPMRequest * request, int count )
7914 {
7915 int reason = 0;
7916
7917 do {
7918 if (kIOPM_Finished == fMachineState) {
7919 break;
7920 }
7921
7922 if (kIOPM_DriverThreadCallDone == fMachineState) {
7923 // 5 = kDriverCallInformPreChange
7924 // 6 = kDriverCallInformPostChange
7925 // 7 = kDriverCallSetPowerState
7926 // 8 = kRootDomainInformPreChange
7927 if (fDriverCallBusy) {
7928 reason = 5 + fDriverCallReason;
7929 }
7930 break;
7931 }
7932
7933 // Waiting on driver's setPowerState() timeout.
7934 if (fDriverTimer) {
7935 reason = 1; break;
7936 }
7937
7938 // Child or interested driver acks pending.
7939 if (fHeadNotePendingAcks) {
7940 reason = 2; break;
7941 }
7942
7943 // Waiting on apps or priority power interest clients.
7944 if (fResponseArray) {
7945 reason = 3; break;
7946 }
7947
7948 #if USE_SETTLE_TIMER
7949 // Waiting on settle timer expiration.
7950 if (fSettleTimeUS) {
7951 reason = 4; break;
7952 }
7953 #endif
7954 } while (false);
7955
7956 fWaitReason = reason;
7957
7958 if (reason) {
7959 if (count) {
7960 PM_LOG1("[B %02x] %p [%p %s] state %d, reason %d\n",
7961 request->getType(), OBFUSCATE(request),
7962 OBFUSCATE(this), getName(),
7963 fMachineState, reason);
7964 }
7965
7966 return true;
7967 }
7968
7969 return false;
7970 }
7971
7972 //*********************************************************************************
7973 // [private] actionPMWorkQueueInvoke
7974 //
7975 // IOPMWorkQueue::checkForWork() passing a request to the
7976 // request target for execution.
7977 //*********************************************************************************
7978
7979 bool
actionPMWorkQueueInvoke(IOPMRequest * request,IOPMWorkQueue * queue)7980 IOService::actionPMWorkQueueInvoke( IOPMRequest * request, IOPMWorkQueue * queue )
7981 {
7982 bool done = false;
7983 int loop = 0;
7984
7985 assert(request && queue);
7986
7987 while (isPMBlocked(request, loop++) == false) {
7988 PM_LOG1("[W %02x] %p [%p %s] state %d\n",
7989 request->getType(), OBFUSCATE(request),
7990 OBFUSCATE(this), getName(), fMachineState);
7991
7992 gIOPMRequest = request;
7993 gIOPMWorkInvokeCount++;
7994
7995 // Every PM machine states must be handled in one of the cases below.
7996
7997 switch (fMachineState) {
7998 case kIOPM_Finished:
7999 start_watchdog_timer();
8000
8001 executePMRequest( request );
8002 break;
8003
8004 case kIOPM_OurChangeTellClientsPowerDown:
8005 // Root domain might self cancel due to assertions.
8006 if (IS_ROOT_DOMAIN) {
8007 bool cancel = (bool) fDoNotPowerDown;
8008 getPMRootDomain()->askChangeDownDone(
8009 &fHeadNoteChangeFlags, &cancel);
8010 fDoNotPowerDown = cancel;
8011 }
8012
8013 // askChangeDown() done, was it vetoed?
8014 if (!fDoNotPowerDown) {
8015 // no, we can continue
8016 OurChangeTellClientsPowerDown();
8017 } else {
8018 OUR_PMLog(kPMLogIdleCancel, (uintptr_t) this, fMachineState);
8019 PM_ERROR("%s: idle cancel, state %u\n", fName, fMachineState);
8020 #if DEVELOPMENT || DEBUG
8021 record_system_event(SYSTEM_EVENT_TYPE_INFO,
8022 SYSTEM_EVENT_SUBSYSTEM_PMRD,
8023 "Idle Sleep", "%s idle cancel, state %u", fName, fMachineState
8024 );
8025 #endif /* DEVELOPMENT || DEBUG */
8026 if (IS_ROOT_DOMAIN) {
8027 // RootDomain already sent "WillSleep" to its clients
8028 tellChangeUp(fCurrentPowerState);
8029 } else {
8030 tellNoChangeDown(fHeadNotePowerState);
8031 }
8032 // mark the change note un-actioned
8033 fHeadNoteChangeFlags |= kIOPMNotDone;
8034 // and we're done
8035 OurChangeFinish();
8036 }
8037 break;
8038
8039 case kIOPM_OurChangeTellUserPMPolicyPowerDown:
8040 // PMRD: tellChangeDown/kNotifyApps done, was it cancelled?
8041 if (fDoNotPowerDown) {
8042 OUR_PMLog(kPMLogIdleCancel, (uintptr_t) this, fMachineState);
8043 PM_ERROR("%s: idle cancel, state %u\n", fName, fMachineState);
8044 #if DEVELOPMENT || DEBUG
8045 record_system_event(SYSTEM_EVENT_TYPE_INFO,
8046 SYSTEM_EVENT_SUBSYSTEM_PMRD,
8047 "Idle Sleep", "%s idle cancel, state %u", fName, fMachineState
8048 );
8049 #endif /* DEVELOPMENT || DEBUG */
8050 if (IS_ROOT_DOMAIN) {
8051 // RootDomain already sent "WillSleep" to its clients
8052 tellChangeUp(fCurrentPowerState);
8053 } else {
8054 tellNoChangeDown(fHeadNotePowerState);
8055 }
8056 // mark the change note un-actioned
8057 fHeadNoteChangeFlags |= kIOPMNotDone;
8058 // and we're done
8059 OurChangeFinish();
8060 } else {
8061 OurChangeTellUserPMPolicyPowerDown();
8062 }
8063 break;
8064
8065 case kIOPM_OurChangeTellPriorityClientsPowerDown:
8066 // PMRD: LastCallBeforeSleep notify done
8067 // Non-PMRD: tellChangeDown/kNotifyApps done
8068 if (fDoNotPowerDown) {
8069 OUR_PMLog(kPMLogIdleCancel, (uintptr_t) this, fMachineState);
8070 PM_ERROR("%s: idle revert, state %u\n", fName, fMachineState);
8071 // no, tell clients we're back in the old state
8072 tellChangeUp(fCurrentPowerState);
8073 // mark the change note un-actioned
8074 fHeadNoteChangeFlags |= kIOPMNotDone;
8075 // and we're done
8076 OurChangeFinish();
8077 } else {
8078 // yes, we can continue
8079 if (IS_ROOT_DOMAIN) {
8080 // Can no longer revert idle sleep
8081 getPMRootDomain()->setIdleSleepRevertible(false);
8082 }
8083 OurChangeTellPriorityClientsPowerDown();
8084 }
8085 break;
8086
8087 case kIOPM_OurChangeNotifyInterestedDriversWillChange:
8088 OurChangeNotifyInterestedDriversWillChange();
8089 break;
8090
8091 case kIOPM_OurChangeSetPowerState:
8092 OurChangeSetPowerState();
8093 break;
8094
8095 case kIOPM_OurChangeWaitForPowerSettle:
8096 OurChangeWaitForPowerSettle();
8097 break;
8098
8099 case kIOPM_OurChangeNotifyInterestedDriversDidChange:
8100 OurChangeNotifyInterestedDriversDidChange();
8101 break;
8102
8103 case kIOPM_OurChangeTellCapabilityDidChange:
8104 OurChangeTellCapabilityDidChange();
8105 break;
8106
8107 case kIOPM_OurChangeFinish:
8108 OurChangeFinish();
8109 break;
8110
8111 case kIOPM_ParentChangeTellPriorityClientsPowerDown:
8112 ParentChangeTellPriorityClientsPowerDown();
8113 break;
8114
8115 case kIOPM_ParentChangeNotifyInterestedDriversWillChange:
8116 ParentChangeNotifyInterestedDriversWillChange();
8117 break;
8118
8119 case kIOPM_ParentChangeSetPowerState:
8120 ParentChangeSetPowerState();
8121 break;
8122
8123 case kIOPM_ParentChangeWaitForPowerSettle:
8124 ParentChangeWaitForPowerSettle();
8125 break;
8126
8127 case kIOPM_ParentChangeNotifyInterestedDriversDidChange:
8128 ParentChangeNotifyInterestedDriversDidChange();
8129 break;
8130
8131 case kIOPM_ParentChangeTellCapabilityDidChange:
8132 ParentChangeTellCapabilityDidChange();
8133 break;
8134
8135 case kIOPM_ParentChangeAcknowledgePowerChange:
8136 ParentChangeAcknowledgePowerChange();
8137 break;
8138
8139 case kIOPM_DriverThreadCallDone:
8140 switch (fDriverCallReason) {
8141 case kDriverCallInformPreChange:
8142 case kDriverCallInformPostChange:
8143 notifyInterestedDriversDone();
8144 break;
8145 case kDriverCallSetPowerState:
8146 notifyControllingDriverDone();
8147 break;
8148 case kRootDomainInformPreChange:
8149 notifyRootDomainDone();
8150 break;
8151 default:
8152 panic("%s: bad call reason %x",
8153 getName(), fDriverCallReason);
8154 }
8155 break;
8156
8157 case kIOPM_NotifyChildrenOrdered:
8158 notifyChildrenOrdered();
8159 break;
8160
8161 case kIOPM_NotifyChildrenDelayed:
8162 notifyChildrenDelayed();
8163 break;
8164
8165 case kIOPM_NotifyChildrenStart:
8166 // pop notifyAll() state saved by notifyInterestedDriversDone()
8167 MS_POP();
8168 notifyRootDomain();
8169 break;
8170
8171 case kIOPM_SyncTellClientsPowerDown:
8172 // Root domain might self cancel due to assertions.
8173 if (IS_ROOT_DOMAIN) {
8174 bool cancel = (bool) fDoNotPowerDown;
8175 getPMRootDomain()->askChangeDownDone(
8176 &fHeadNoteChangeFlags, &cancel);
8177 fDoNotPowerDown = cancel;
8178 }
8179 if (!fDoNotPowerDown) {
8180 fMachineState = kIOPM_SyncTellPriorityClientsPowerDown;
8181 fOutOfBandParameter = kNotifyApps;
8182 tellChangeDown(fHeadNotePowerState);
8183 } else {
8184 // Cancelled by IOPMrootDomain::askChangeDownDone() or
8185 // askChangeDown/kNotifyApps
8186 OUR_PMLog(kPMLogIdleCancel, (uintptr_t) this, fMachineState);
8187 PM_ERROR("%s: idle cancel, state %u\n", fName, fMachineState);
8188 #if DEVELOPMENT || DEBUG
8189 record_system_event(SYSTEM_EVENT_TYPE_INFO,
8190 SYSTEM_EVENT_SUBSYSTEM_PMRD,
8191 "Idle Sleep", "%s idle cancel, state %u", fName, fMachineState
8192 );
8193 #endif /* DEVELOPMENT || DEBUG */
8194 tellNoChangeDown(fHeadNotePowerState);
8195 fHeadNoteChangeFlags |= kIOPMNotDone;
8196 OurChangeFinish();
8197 }
8198 break;
8199
8200 case kIOPM_SyncTellPriorityClientsPowerDown:
8201 // PMRD: tellChangeDown/kNotifyApps done, was it cancelled?
8202 if (!fDoNotPowerDown) {
8203 fMachineState = kIOPM_SyncNotifyWillChange;
8204 fOutOfBandParameter = kNotifyPriority;
8205 tellChangeDown(fHeadNotePowerState);
8206 } else {
8207 OUR_PMLog(kPMLogIdleCancel, (uintptr_t) this, fMachineState);
8208 PM_ERROR("%s: idle revert, state %u\n", fName, fMachineState);
8209 tellChangeUp(fCurrentPowerState);
8210 fHeadNoteChangeFlags |= kIOPMNotDone;
8211 OurChangeFinish();
8212 }
8213 break;
8214
8215 case kIOPM_SyncNotifyWillChange:
8216 if (kIOPMSyncNoChildNotify & fHeadNoteChangeFlags) {
8217 fMachineState = kIOPM_SyncFinish;
8218 continue;
8219 }
8220 fMachineState = kIOPM_SyncNotifyDidChange;
8221 fDriverCallReason = kDriverCallInformPreChange;
8222 notifyChildren();
8223 break;
8224
8225 case kIOPM_SyncNotifyDidChange:
8226 fIsPreChange = false;
8227
8228 if (fHeadNoteChangeFlags & kIOPMParentInitiated) {
8229 fMachineState = kIOPM_SyncFinish;
8230 } else {
8231 assert(IS_ROOT_DOMAIN);
8232 fMachineState = kIOPM_SyncTellCapabilityDidChange;
8233 }
8234
8235 fDriverCallReason = kDriverCallInformPostChange;
8236 notifyChildren();
8237 break;
8238
8239 case kIOPM_SyncTellCapabilityDidChange:
8240 tellSystemCapabilityChange( kIOPM_SyncFinish );
8241 break;
8242
8243 case kIOPM_SyncFinish:
8244 if (fHeadNoteChangeFlags & kIOPMParentInitiated) {
8245 ParentChangeAcknowledgePowerChange();
8246 } else {
8247 OurChangeFinish();
8248 }
8249 break;
8250
8251 case kIOPM_TellCapabilityChangeDone:
8252 if (fIsPreChange) {
8253 if (fOutOfBandParameter == kNotifyCapabilityChangePriority) {
8254 MS_POP(); // MS passed to tellSystemCapabilityChange()
8255 continue;
8256 }
8257 fOutOfBandParameter = kNotifyCapabilityChangePriority;
8258 } else {
8259 if (fOutOfBandParameter == kNotifyCapabilityChangeApps) {
8260 MS_POP(); // MS passed to tellSystemCapabilityChange()
8261 continue;
8262 }
8263 fOutOfBandParameter = kNotifyCapabilityChangeApps;
8264 }
8265 tellClientsWithResponse( fOutOfBandMessage );
8266 break;
8267
8268 default:
8269 panic("PMWorkQueueInvoke: unknown machine state %x",
8270 fMachineState);
8271 }
8272
8273 gIOPMRequest = NULL;
8274
8275 if (fMachineState == kIOPM_Finished) {
8276 stop_watchdog_timer();
8277 done = true;
8278 break;
8279 }
8280 }
8281
8282 return done;
8283 }
8284
8285 //*********************************************************************************
8286 // [private] executePMRequest
8287 //*********************************************************************************
8288
8289 void
executePMRequest(IOPMRequest * request)8290 IOService::executePMRequest( IOPMRequest * request )
8291 {
8292 assert( kIOPM_Finished == fMachineState );
8293
8294 switch (request->getType()) {
8295 case kIOPMRequestTypePMStop:
8296 handlePMstop( request );
8297 break;
8298
8299 case kIOPMRequestTypeAddPowerChild1:
8300 addPowerChild1( request );
8301 break;
8302
8303 case kIOPMRequestTypeAddPowerChild2:
8304 addPowerChild2( request );
8305 break;
8306
8307 case kIOPMRequestTypeAddPowerChild3:
8308 addPowerChild3( request );
8309 break;
8310
8311 case kIOPMRequestTypeRegisterPowerDriver:
8312 handleRegisterPowerDriver( request );
8313 break;
8314
8315 case kIOPMRequestTypeAdjustPowerState:
8316 fAdjustPowerScheduled = false;
8317 adjustPowerState();
8318 break;
8319
8320 case kIOPMRequestTypePowerDomainWillChange:
8321 handlePowerDomainWillChangeTo( request );
8322 break;
8323
8324 case kIOPMRequestTypePowerDomainDidChange:
8325 handlePowerDomainDidChangeTo( request );
8326 break;
8327
8328 case kIOPMRequestTypeRequestPowerState:
8329 case kIOPMRequestTypeRequestPowerStateOverride:
8330 handleRequestPowerState( request );
8331 break;
8332
8333 case kIOPMRequestTypePowerOverrideOnPriv:
8334 case kIOPMRequestTypePowerOverrideOffPriv:
8335 handlePowerOverrideChanged( request );
8336 break;
8337
8338 case kIOPMRequestTypeActivityTickle:
8339 handleActivityTickle( request );
8340 break;
8341
8342 case kIOPMRequestTypeSynchronizePowerTree:
8343 handleSynchronizePowerTree( request );
8344 break;
8345
8346 case kIOPMRequestTypeSetIdleTimerPeriod:
8347 {
8348 fIdleTimerPeriod = (typeof(fIdleTimerPeriod))(uintptr_t) request->fArg0;
8349 fNextIdleTimerPeriod = fIdleTimerPeriod;
8350 if ((false == fLockedFlags.PMStop) && (fIdleTimerPeriod > 0)) {
8351 restartIdleTimer();
8352 }
8353 }
8354 break;
8355
8356 case kIOPMRequestTypeIgnoreIdleTimer:
8357 fIdleTimerIgnored = request->fArg0 ? 1 : 0;
8358 break;
8359
8360 case kIOPMRequestTypeQuiescePowerTree:
8361 gIOPMWorkQueue->finishQuiesceRequest(request);
8362 break;
8363
8364 case kIOPMRequestTypeDeferredActivityTickle:
8365 handleDeferredActivityTickle(request);
8366 break;
8367
8368 default:
8369 panic("executePMRequest: unknown request type %x", request->getType());
8370 }
8371 }
8372
8373 //*********************************************************************************
8374 // [private] actionPMReplyQueue
8375 //
8376 // IOPMRequestQueue::checkForWork() passing a reply-type request to the
8377 // request target.
8378 //*********************************************************************************
8379
8380 bool
actionPMReplyQueue(IOPMRequest * request,IOPMRequestQueue * queue)8381 IOService::actionPMReplyQueue( IOPMRequest * request, IOPMRequestQueue * queue )
8382 {
8383 bool more = false;
8384
8385 assert( request && queue );
8386 assert( request->isReplyType());
8387
8388 PM_LOG1("[A %02x] %p [%p %s] state %d\n",
8389 request->getType(), OBFUSCATE(request),
8390 OBFUSCATE(this), getName(), fMachineState);
8391
8392 switch (request->getType()) {
8393 case kIOPMRequestTypeAllowPowerChange:
8394 case kIOPMRequestTypeCancelPowerChange:
8395 // Check if we are expecting this response.
8396 if (responseValid((uint32_t)(uintptr_t) request->fArg0,
8397 (int)(uintptr_t) request->fArg1)) {
8398 if (kIOPMRequestTypeCancelPowerChange == request->getType()) {
8399 // Clients are not allowed to cancel when kIOPMSkipAskPowerDown
8400 // flag is set. Only root domain will set this flag.
8401 // However, there is one exception to this rule. User-space PM
8402 // policy may choose to cancel sleep even after all clients have
8403 // been notified that we will lower power.
8404
8405 if ((fMachineState == kIOPM_OurChangeTellUserPMPolicyPowerDown)
8406 || (fMachineState == kIOPM_OurChangeTellPriorityClientsPowerDown)
8407 || ((fHeadNoteChangeFlags & kIOPMSkipAskPowerDown) == 0)) {
8408 fDoNotPowerDown = true;
8409
8410 OSString * name = (OSString *) request->fArg2;
8411 getPMRootDomain()->pmStatsRecordApplicationResponse(
8412 gIOPMStatsResponseCancel,
8413 name ? name->getCStringNoCopy() : "", 0,
8414 0, (int)(uintptr_t) request->fArg1, NULL);
8415 }
8416 }
8417
8418 // Update any clients that have exceeded their requested ack periods.
8419 updateClientResponses();
8420
8421 if (checkForDone()) {
8422 stop_ack_timer();
8423 cleanClientResponses(false);
8424 more = true;
8425 }
8426 }
8427 // OSString containing app name in Arg2 must be released.
8428 if (request->getType() == kIOPMRequestTypeCancelPowerChange) {
8429 OSObject * obj = (OSObject *) request->fArg2;
8430 if (obj) {
8431 obj->release();
8432 }
8433 }
8434 break;
8435
8436 case kIOPMRequestTypeAckPowerChange:
8437 more = handleAcknowledgePowerChange( request );
8438 break;
8439
8440 case kIOPMRequestTypeAckSetPowerState:
8441 more = handleAcknowledgeSetPowerState( request );
8442 break;
8443
8444 case kIOPMRequestTypeInterestChanged:
8445 handleInterestChanged( request );
8446 more = true;
8447 break;
8448
8449 case kIOPMRequestTypeIdleCancel:
8450 more = handleCancelIdlePowerDown();
8451 break;
8452
8453 case kIOPMRequestTypeChildNotifyDelayCancel:
8454 if (fMachineState == kIOPM_NotifyChildrenDelayed) {
8455 PM_LOG2("%s: delay notify cancelled\n", getName());
8456 notifyChildrenDelayed();
8457 }
8458 break;
8459
8460 default:
8461 panic("PMReplyQueue: unknown reply type %x", request->getType());
8462 }
8463
8464 more |= gIOPMCompletionQueue->queuePMRequest(request);
8465 if (more) {
8466 gIOPMWorkQueue->incrementProducerCount();
8467 }
8468
8469 return more;
8470 }
8471
8472 //*********************************************************************************
8473 // [private] assertPMDriverCall / deassertPMDriverCall
8474 //*********************************************************************************
8475
8476 bool
assertPMDriverCall(IOPMDriverCallEntry * entry,IOOptionBits method,const IOPMinformee * inform,IOOptionBits options)8477 IOService::assertPMDriverCall(
8478 IOPMDriverCallEntry * entry,
8479 IOOptionBits method,
8480 const IOPMinformee * inform,
8481 IOOptionBits options )
8482 {
8483 IOService * target = NULL;
8484 bool ok = false;
8485
8486 if (!initialized) {
8487 return false;
8488 }
8489
8490 PM_LOCK();
8491
8492 if (fLockedFlags.PMStop) {
8493 goto fail;
8494 }
8495
8496 if (((options & kIOPMDriverCallNoInactiveCheck) == 0) && isInactive()) {
8497 goto fail;
8498 }
8499
8500 if (inform) {
8501 if (!inform->active) {
8502 goto fail;
8503 }
8504 target = inform->whatObject;
8505 if (target->isInactive()) {
8506 goto fail;
8507 }
8508 }
8509
8510 // Record calling address for sleep failure diagnostics
8511 switch (method) {
8512 case kIOPMDriverCallMethodSetPowerState:
8513 entry->callMethod = OSMemberFunctionCast(const void *, fControllingDriver, &IOService::setPowerState);
8514 break;
8515 case kIOPMDriverCallMethodWillChange:
8516 entry->callMethod = OSMemberFunctionCast(const void *, target, &IOService::powerStateWillChangeTo);
8517 break;
8518 case kIOPMDriverCallMethodDidChange:
8519 entry->callMethod = OSMemberFunctionCast(const void *, target, &IOService::powerStateDidChangeTo);
8520 break;
8521 case kIOPMDriverCallMethodUnknown:
8522 case kIOPMDriverCallMethodSetAggressive:
8523 case kIOPMDriverCallMethodMaxCapabilityForDomainState:
8524 case kIOPMDriverCallMethodInitialPowerStateForDomainState:
8525 default:
8526 entry->callMethod = NULL;
8527 break;
8528 }
8529
8530 entry->thread = current_thread();
8531 entry->target = target;
8532 queue_enter(&fPMDriverCallQueue, entry, IOPMDriverCallEntry *, link);
8533 ok = true;
8534
8535 fail:
8536 PM_UNLOCK();
8537
8538 return ok;
8539 }
8540
8541 void
deassertPMDriverCall(IOPMDriverCallEntry * entry)8542 IOService::deassertPMDriverCall( IOPMDriverCallEntry * entry )
8543 {
8544 bool wakeup = false;
8545
8546 PM_LOCK();
8547
8548 assert( !queue_empty(&fPMDriverCallQueue));
8549 queue_remove(&fPMDriverCallQueue, entry, IOPMDriverCallEntry *, link);
8550 if (fLockedFlags.PMDriverCallWait) {
8551 wakeup = true;
8552 }
8553
8554 PM_UNLOCK();
8555
8556 if (wakeup) {
8557 PM_LOCK_WAKEUP(&fPMDriverCallQueue);
8558 }
8559 }
8560
8561 bool
getBlockingDriverCall(thread_t * thread,const void ** callMethod)8562 IOService::getBlockingDriverCall(thread_t *thread, const void **callMethod)
8563 {
8564 const IOPMDriverCallEntry * entry = NULL;
8565 bool blocked = false;
8566
8567 if (!initialized) {
8568 return false;
8569 }
8570
8571 if (current_thread() != gIOPMWatchDogThread) {
8572 // Meant to be accessed only from watchdog thread
8573 return false;
8574 }
8575
8576 PM_LOCK();
8577 entry = qe_queue_first(&fPMDriverCallQueue, IOPMDriverCallEntry, link);
8578 if (entry) {
8579 *thread = entry->thread;
8580 *callMethod = entry->callMethod;
8581 blocked = true;
8582 }
8583 PM_UNLOCK();
8584
8585 return blocked;
8586 }
8587
8588
8589 void
waitForPMDriverCall(IOService * target)8590 IOService::waitForPMDriverCall( IOService * target )
8591 {
8592 const IOPMDriverCallEntry * entry;
8593 thread_t thread = current_thread();
8594 AbsoluteTime deadline;
8595 int waitResult;
8596 bool log = true;
8597 bool wait;
8598
8599 do {
8600 wait = false;
8601 queue_iterate(&fPMDriverCallQueue, entry, const IOPMDriverCallEntry *, link)
8602 {
8603 // Target of interested driver call
8604 if (target && (target != entry->target)) {
8605 continue;
8606 }
8607
8608 if (entry->thread == thread) {
8609 if (log) {
8610 PM_LOG("%s: %s(%s) on PM thread\n",
8611 fName, __FUNCTION__, target ? target->getName() : "");
8612 OSReportWithBacktrace("%s: %s(%s) on PM thread\n",
8613 fName, __FUNCTION__, target ? target->getName() : "");
8614 log = false;
8615 }
8616 continue;
8617 }
8618
8619 wait = true;
8620 break;
8621 }
8622
8623 if (wait) {
8624 fLockedFlags.PMDriverCallWait = true;
8625 clock_interval_to_deadline(15, kSecondScale, &deadline);
8626 waitResult = PM_LOCK_SLEEP(&fPMDriverCallQueue, deadline);
8627 fLockedFlags.PMDriverCallWait = false;
8628 if (THREAD_TIMED_OUT == waitResult) {
8629 PM_ERROR("%s: waitForPMDriverCall timeout\n", fName);
8630 wait = false;
8631 }
8632 }
8633 } while (wait);
8634 }
8635
8636 //*********************************************************************************
8637 // [private] Debug helpers
8638 //*********************************************************************************
8639
8640 const char *
getIOMessageString(uint32_t msg)8641 IOService::getIOMessageString( uint32_t msg )
8642 {
8643 #define MSG_ENTRY(x) {(int) x, #x}
8644
8645 static const IONamedValue msgNames[] = {
8646 MSG_ENTRY( kIOMessageCanDevicePowerOff ),
8647 MSG_ENTRY( kIOMessageDeviceWillPowerOff ),
8648 MSG_ENTRY( kIOMessageDeviceWillNotPowerOff ),
8649 MSG_ENTRY( kIOMessageDeviceHasPoweredOn ),
8650 MSG_ENTRY( kIOMessageCanSystemPowerOff ),
8651 MSG_ENTRY( kIOMessageSystemWillPowerOff ),
8652 MSG_ENTRY( kIOMessageSystemWillNotPowerOff ),
8653 MSG_ENTRY( kIOMessageCanSystemSleep ),
8654 MSG_ENTRY( kIOMessageSystemWillSleep ),
8655 MSG_ENTRY( kIOMessageSystemWillNotSleep ),
8656 MSG_ENTRY( kIOMessageSystemHasPoweredOn ),
8657 MSG_ENTRY( kIOMessageSystemWillRestart ),
8658 MSG_ENTRY( kIOMessageSystemWillPowerOn ),
8659 MSG_ENTRY( kIOMessageSystemCapabilityChange ),
8660 MSG_ENTRY( kIOPMMessageLastCallBeforeSleep ),
8661 MSG_ENTRY( kIOMessageSystemPagingOff ),
8662 { 0, NULL }
8663 };
8664
8665 return IOFindNameForValue(msg, msgNames);
8666 }
8667
8668 static const char *
getNotificationPhaseString(uint32_t phase)8669 getNotificationPhaseString( uint32_t phase )
8670 {
8671 #define PHASE_ENTRY(x) {(int) x, #x}
8672
8673 static const IONamedValue phaseNames[] = {
8674 PHASE_ENTRY( kNotifyApps ),
8675 PHASE_ENTRY( kNotifyPriority ),
8676 PHASE_ENTRY( kNotifyCapabilityChangeApps ),
8677 PHASE_ENTRY( kNotifyCapabilityChangePriority ),
8678 { 0, NULL }
8679 };
8680
8681 return IOFindNameForValue(phase, phaseNames);
8682 }
8683
8684 // MARK: -
8685 // MARK: IOPMRequest
8686
8687 //*********************************************************************************
8688 // IOPMRequest Class
8689 //
8690 // Requests from PM clients, and also used for inter-object messaging within PM.
8691 //*********************************************************************************
8692
8693 OSDefineMetaClassAndStructors( IOPMRequest, IOCommand );
8694
8695 IOPMRequest *
create(void)8696 IOPMRequest::create( void )
8697 {
8698 IOPMRequest * me = OSTypeAlloc(IOPMRequest);
8699 if (me && !me->init(NULL, kIOPMRequestTypeInvalid)) {
8700 me->release();
8701 me = NULL;
8702 }
8703 return me;
8704 }
8705
8706 bool
init(IOService * target,IOOptionBits type)8707 IOPMRequest::init( IOService * target, IOOptionBits type )
8708 {
8709 if (!IOCommand::init()) {
8710 return false;
8711 }
8712
8713 fRequestType = type;
8714 fTarget = target;
8715
8716 if (fTarget) {
8717 fTarget->retain();
8718 }
8719
8720 // Root node and root domain requests does not prevent the power tree from
8721 // becoming quiescent.
8722
8723 fIsQuiesceBlocker = ((fTarget != gIOPMRootNode) &&
8724 (fTarget != IOService::getPMRootDomain()));
8725
8726 return true;
8727 }
8728
8729 void
reset(void)8730 IOPMRequest::reset( void )
8731 {
8732 assert( fWorkWaitCount == 0 );
8733 assert( fFreeWaitCount == 0 );
8734
8735 detachNextRequest();
8736 detachRootRequest();
8737
8738 if (fCompletionAction && (fRequestType == kIOPMRequestTypeQuiescePowerTree)) {
8739 // Call the completion on PM work loop context
8740 fCompletionAction(fCompletionTarget, fCompletionParam);
8741 fCompletionAction = NULL;
8742 }
8743
8744 fRequestType = kIOPMRequestTypeInvalid;
8745
8746 if (fTarget) {
8747 fTarget->release();
8748 fTarget = NULL;
8749 }
8750 }
8751
8752 bool
attachNextRequest(IOPMRequest * next)8753 IOPMRequest::attachNextRequest( IOPMRequest * next )
8754 {
8755 bool ok = false;
8756
8757 if (!fRequestNext) {
8758 // Postpone the execution of the next request after
8759 // this request.
8760 fRequestNext = next;
8761 fRequestNext->fWorkWaitCount++;
8762 #if LOG_REQUEST_ATTACH
8763 PM_LOG("Attached next: %p [0x%x] -> %p [0x%x, %u] %s\n",
8764 OBFUSCATE(this), fRequestType, OBFUSCATE(fRequestNext),
8765 fRequestNext->fRequestType,
8766 (uint32_t) fRequestNext->fWorkWaitCount,
8767 fTarget->getName());
8768 #endif
8769 ok = true;
8770 }
8771 return ok;
8772 }
8773
8774 bool
detachNextRequest(void)8775 IOPMRequest::detachNextRequest( void )
8776 {
8777 bool ok = false;
8778
8779 if (fRequestNext) {
8780 assert(fRequestNext->fWorkWaitCount);
8781 if (fRequestNext->fWorkWaitCount) {
8782 fRequestNext->fWorkWaitCount--;
8783 }
8784 #if LOG_REQUEST_ATTACH
8785 PM_LOG("Detached next: %p [0x%x] -> %p [0x%x, %u] %s\n",
8786 OBFUSCATE(this), fRequestType, OBFUSCATE(fRequestNext),
8787 fRequestNext->fRequestType,
8788 (uint32_t) fRequestNext->fWorkWaitCount,
8789 fTarget->getName());
8790 #endif
8791 fRequestNext = NULL;
8792 ok = true;
8793 }
8794 return ok;
8795 }
8796
8797 bool
attachRootRequest(IOPMRequest * root)8798 IOPMRequest::attachRootRequest( IOPMRequest * root )
8799 {
8800 bool ok = false;
8801
8802 if (!fRequestRoot) {
8803 // Delay the completion of the root request after
8804 // this request.
8805 fRequestRoot = root;
8806 fRequestRoot->fFreeWaitCount++;
8807 #if LOG_REQUEST_ATTACH
8808 PM_LOG("Attached root: %p [0x%x] -> %p [0x%x, %u] %s\n",
8809 OBFUSCATE(this), (uint32_t) fType, OBFUSCATE(fRequestRoot),
8810 (uint32_t) fRequestRoot->fType,
8811 (uint32_t) fRequestRoot->fFreeWaitCount,
8812 fTarget->getName());
8813 #endif
8814 ok = true;
8815 }
8816 return ok;
8817 }
8818
8819 bool
detachRootRequest(void)8820 IOPMRequest::detachRootRequest( void )
8821 {
8822 bool ok = false;
8823
8824 if (fRequestRoot) {
8825 assert(fRequestRoot->fFreeWaitCount);
8826 if (fRequestRoot->fFreeWaitCount) {
8827 fRequestRoot->fFreeWaitCount--;
8828 }
8829 #if LOG_REQUEST_ATTACH
8830 PM_LOG("Detached root: %p [0x%x] -> %p [0x%x, %u] %s\n",
8831 OBFUSCATE(this), (uint32_t) fType, OBFUSCATE(fRequestRoot),
8832 (uint32_t) fRequestRoot->fType,
8833 (uint32_t) fRequestRoot->fFreeWaitCount,
8834 fTarget->getName());
8835 #endif
8836 fRequestRoot = NULL;
8837 ok = true;
8838 }
8839 return ok;
8840 }
8841
8842 // MARK: -
8843 // MARK: IOPMRequestQueue
8844
8845 //*********************************************************************************
8846 // IOPMRequestQueue Class
8847 //
8848 // Global queues. Queues are created once and never released.
8849 //*********************************************************************************
8850
8851 OSDefineMetaClassAndStructors( IOPMRequestQueue, IOEventSource );
8852
8853 #pragma clang diagnostic push
8854 #pragma clang diagnostic ignored "-Wcast-function-type"
8855
8856 IOPMRequestQueue *
create(IOService * inOwner,Action inAction)8857 IOPMRequestQueue::create( IOService * inOwner, Action inAction )
8858 {
8859 IOPMRequestQueue * me = OSTypeAlloc(IOPMRequestQueue);
8860 if (me && !me->init(inOwner, inAction)) {
8861 me->release();
8862 me = NULL;
8863 }
8864 return me;
8865 }
8866
8867 bool
init(IOService * inOwner,Action inAction)8868 IOPMRequestQueue::init( IOService * inOwner, Action inAction )
8869 {
8870 if (!inAction || !IOEventSource::init(inOwner, (IOEventSourceAction)inAction)) {
8871 return false;
8872 }
8873
8874 queue_init(&fQueue);
8875 fLock = IOLockAlloc();
8876 return fLock != NULL;
8877 }
8878
8879 #pragma clang diagnostic pop
8880
8881 void
free(void)8882 IOPMRequestQueue::free( void )
8883 {
8884 if (fLock) {
8885 IOLockFree(fLock);
8886 fLock = NULL;
8887 }
8888 return IOEventSource::free();
8889 }
8890
8891 void
queuePMRequest(IOPMRequest * request)8892 IOPMRequestQueue::queuePMRequest( IOPMRequest * request )
8893 {
8894 uint64_t now = mach_continuous_time();
8895
8896 assert(request);
8897 request->setTimestamp(now);
8898 IOLockLock(fLock);
8899 queue_enter(&fQueue, request, typeof(request), fCommandChain);
8900 IOLockUnlock(fLock);
8901 if (workLoop) {
8902 signalWorkAvailable();
8903 }
8904 }
8905
8906 void
queuePMRequestChain(IOPMRequest ** requests,IOItemCount count)8907 IOPMRequestQueue::queuePMRequestChain( IOPMRequest ** requests, IOItemCount count )
8908 {
8909 IOPMRequest * next;
8910 uint64_t now = mach_continuous_time();
8911
8912 assert(requests && count);
8913 IOLockLock(fLock);
8914 while (count--) {
8915 next = *requests;
8916 next->setTimestamp(now);
8917 requests++;
8918 queue_enter(&fQueue, next, typeof(next), fCommandChain);
8919 }
8920 IOLockUnlock(fLock);
8921 if (workLoop) {
8922 signalWorkAvailable();
8923 }
8924 }
8925
8926 bool
checkForWork(void)8927 IOPMRequestQueue::checkForWork( void )
8928 {
8929 Action dqAction = (Action) (void (*)(void))action;
8930 IOPMRequest * request;
8931 IOService * target;
8932 int dequeueCount = 0;
8933 bool more = false;
8934
8935 IOLockLock( fLock );
8936
8937 while (!queue_empty(&fQueue)) {
8938 if (dequeueCount++ >= kMaxDequeueCount) {
8939 // Allow other queues a chance to work
8940 more = true;
8941 break;
8942 }
8943
8944 queue_remove_first(&fQueue, request, typeof(request), fCommandChain);
8945 IOLockUnlock(fLock);
8946 target = request->getTarget();
8947 assert(target);
8948 more |= (*dqAction)( target, request, this );
8949 IOLockLock( fLock );
8950 }
8951
8952 IOLockUnlock( fLock );
8953 return more;
8954 }
8955
8956 // MARK: -
8957 // MARK: IOPMWorkQueue
8958
8959 //*********************************************************************************
8960 // IOPMWorkQueue Class
8961 //
8962 // Queue of IOServicePM objects, each with a queue of IOPMRequest sharing the
8963 // same target.
8964 //*********************************************************************************
8965
8966 OSDefineMetaClassAndStructors( IOPMWorkQueue, IOEventSource );
8967
8968 IOPMWorkQueue *
create(IOService * inOwner,Action invoke,Action retire)8969 IOPMWorkQueue::create( IOService * inOwner, Action invoke, Action retire )
8970 {
8971 IOPMWorkQueue * me = OSTypeAlloc(IOPMWorkQueue);
8972 if (me && !me->init(inOwner, invoke, retire)) {
8973 me->release();
8974 me = NULL;
8975 }
8976 return me;
8977 }
8978
8979 bool
init(IOService * inOwner,Action invoke,Action retire)8980 IOPMWorkQueue::init( IOService * inOwner, Action invoke, Action retire )
8981 {
8982 if (!invoke || !retire ||
8983 !IOEventSource::init(inOwner, (IOEventSourceAction)NULL)) {
8984 return false;
8985 }
8986
8987 queue_init(&fWorkQueue);
8988
8989 fInvokeAction = invoke;
8990 fRetireAction = retire;
8991 fConsumerCount = fProducerCount = 0;
8992
8993 return true;
8994 }
8995
8996 bool
queuePMRequest(IOPMRequest * request,IOServicePM * pwrMgt)8997 IOPMWorkQueue::queuePMRequest( IOPMRequest * request, IOServicePM * pwrMgt )
8998 {
8999 queue_head_t * requestQueue;
9000 bool more = false;
9001 bool empty;
9002
9003 assert( request );
9004 assert( pwrMgt );
9005 assert( onThread());
9006 assert( queue_next(&request->fCommandChain) ==
9007 queue_prev(&request->fCommandChain));
9008
9009 gIOPMBusyRequestCount++;
9010
9011 if (request->isQuiesceType()) {
9012 if ((request->getTarget() == gIOPMRootNode) && !fQuiesceStartTime) {
9013 // Attach new quiesce request to all quiesce blockers in the queue
9014 fQuiesceStartTime = mach_absolute_time();
9015 attachQuiesceRequest(request);
9016 fQuiesceRequest = request;
9017 }
9018 } else if (fQuiesceRequest && request->isQuiesceBlocker()) {
9019 // Attach the new quiesce blocker to the blocked quiesce request
9020 request->attachNextRequest(fQuiesceRequest);
9021 }
9022
9023 // Add new request to the tail of the per-service request queue.
9024 // Then immediately check the request queue to minimize latency
9025 // if the queue was empty.
9026
9027 requestQueue = &pwrMgt->RequestHead;
9028 empty = queue_empty(requestQueue);
9029 queue_enter(requestQueue, request, typeof(request), fCommandChain);
9030 if (empty) {
9031 more = checkRequestQueue(requestQueue, &empty);
9032 if (!empty) {
9033 // Request just added is blocked, add its target IOServicePM
9034 // to the work queue.
9035 assert( queue_next(&pwrMgt->WorkChain) ==
9036 queue_prev(&pwrMgt->WorkChain));
9037
9038 queue_enter(&fWorkQueue, pwrMgt, typeof(pwrMgt), WorkChain);
9039 fQueueLength++;
9040 PM_LOG3("IOPMWorkQueue: [%u] added %s@%p to queue\n",
9041 fQueueLength, pwrMgt->Name, OBFUSCATE(pwrMgt));
9042 }
9043 }
9044
9045 return more;
9046 }
9047
9048 bool
checkRequestQueue(queue_head_t * requestQueue,bool * empty)9049 IOPMWorkQueue::checkRequestQueue( queue_head_t * requestQueue, bool * empty )
9050 {
9051 IOPMRequest * request;
9052 IOService * target;
9053 bool more = false;
9054 bool done = false;
9055
9056 assert(!queue_empty(requestQueue));
9057 do {
9058 request = (typeof(request))queue_first(requestQueue);
9059 if (request->isWorkBlocked()) {
9060 break; // request dispatch blocked on attached request
9061 }
9062 target = request->getTarget();
9063 if (fInvokeAction) {
9064 done = (*fInvokeAction)( target, request, this );
9065 } else {
9066 PM_LOG("PM request 0x%x dropped\n", request->getType());
9067 done = true;
9068 }
9069 if (!done) {
9070 break; // PM state machine blocked
9071 }
9072 assert(gIOPMBusyRequestCount > 0);
9073 if (gIOPMBusyRequestCount) {
9074 gIOPMBusyRequestCount--;
9075 }
9076
9077 if (request == fQuiesceRequest) {
9078 fQuiesceRequest = NULL;
9079 }
9080
9081 queue_remove_first(requestQueue, request, typeof(request), fCommandChain);
9082 more |= (*fRetireAction)( target, request, this );
9083 done = queue_empty(requestQueue);
9084 } while (!done);
9085
9086 *empty = done;
9087
9088 if (more) {
9089 // Retired a request that may unblock a previously visited request
9090 // that is still waiting on the work queue. Must trigger another
9091 // queue check.
9092 fProducerCount++;
9093 }
9094
9095 return more;
9096 }
9097
9098 bool
checkForWork(void)9099 IOPMWorkQueue::checkForWork( void )
9100 {
9101 IOServicePM * entry;
9102 IOServicePM * next;
9103 bool more = false;
9104 bool empty;
9105
9106 #if WORK_QUEUE_STATS
9107 fStatCheckForWork++;
9108 #endif
9109
9110 // Iterate over all IOServicePM entries in the work queue,
9111 // and check each entry's request queue.
9112
9113 while (fConsumerCount != fProducerCount) {
9114 PM_LOG3("IOPMWorkQueue: checkForWork %u %u\n",
9115 fProducerCount, fConsumerCount);
9116
9117 fConsumerCount = fProducerCount;
9118
9119 #if WORK_QUEUE_STATS
9120 if (queue_empty(&fWorkQueue)) {
9121 fStatQueueEmpty++;
9122 break;
9123 }
9124 fStatScanEntries++;
9125 uint32_t cachedWorkCount = gIOPMWorkInvokeCount;
9126 #endif
9127
9128 __IGNORE_WCASTALIGN(entry = (typeof(entry))queue_first(&fWorkQueue));
9129 while (!queue_end(&fWorkQueue, (queue_entry_t) entry)) {
9130 more |= checkRequestQueue(&entry->RequestHead, &empty);
9131
9132 // Get next entry, points to head if current entry is last.
9133 __IGNORE_WCASTALIGN(next = (typeof(next))queue_next(&entry->WorkChain));
9134
9135 // if request queue is empty, remove IOServicePM from work queue.
9136 if (empty) {
9137 assert(fQueueLength);
9138 if (fQueueLength) {
9139 fQueueLength--;
9140 }
9141 PM_LOG3("IOPMWorkQueue: [%u] removed %s@%p from queue\n",
9142 fQueueLength, entry->Name, OBFUSCATE(entry));
9143 queue_remove(&fWorkQueue, entry, typeof(entry), WorkChain);
9144 }
9145 entry = next;
9146 }
9147
9148 #if WORK_QUEUE_STATS
9149 if (cachedWorkCount == gIOPMWorkInvokeCount) {
9150 fStatNoWorkDone++;
9151 }
9152 #endif
9153 }
9154
9155 return more;
9156 }
9157
9158 void
signalWorkAvailable(void)9159 IOPMWorkQueue::signalWorkAvailable( void )
9160 {
9161 fProducerCount++;
9162 IOEventSource::signalWorkAvailable();
9163 }
9164
9165 void
incrementProducerCount(void)9166 IOPMWorkQueue::incrementProducerCount( void )
9167 {
9168 fProducerCount++;
9169 }
9170
9171 void
attachQuiesceRequest(IOPMRequest * quiesceRequest)9172 IOPMWorkQueue::attachQuiesceRequest( IOPMRequest * quiesceRequest )
9173 {
9174 IOServicePM * entry;
9175 IOPMRequest * request;
9176
9177 if (queue_empty(&fWorkQueue)) {
9178 return;
9179 }
9180
9181 queue_iterate(&fWorkQueue, entry, typeof(entry), WorkChain)
9182 {
9183 queue_iterate(&entry->RequestHead, request, typeof(request), fCommandChain)
9184 {
9185 // Attach the quiesce request to any request in the queue that
9186 // is not linked to a next request. These requests will block
9187 // the quiesce request.
9188
9189 if (request->isQuiesceBlocker()) {
9190 request->attachNextRequest(quiesceRequest);
9191 }
9192 }
9193 }
9194 }
9195
9196 void
finishQuiesceRequest(IOPMRequest * quiesceRequest)9197 IOPMWorkQueue::finishQuiesceRequest( IOPMRequest * quiesceRequest )
9198 {
9199 if (fQuiesceRequest && (quiesceRequest == fQuiesceRequest) &&
9200 (fQuiesceStartTime != 0)) {
9201 fInvokeAction = NULL;
9202 fQuiesceFinishTime = mach_absolute_time();
9203 }
9204 }
9205
9206 // MARK: -
9207 // MARK: IOPMCompletionQueue
9208
9209 //*********************************************************************************
9210 // IOPMCompletionQueue Class
9211 //*********************************************************************************
9212
9213 OSDefineMetaClassAndStructors( IOPMCompletionQueue, IOEventSource );
9214
9215 #pragma clang diagnostic push
9216 #pragma clang diagnostic ignored "-Wcast-function-type"
9217
9218 IOPMCompletionQueue *
create(IOService * inOwner,Action inAction)9219 IOPMCompletionQueue::create( IOService * inOwner, Action inAction )
9220 {
9221 IOPMCompletionQueue * me = OSTypeAlloc(IOPMCompletionQueue);
9222 if (me && !me->init(inOwner, inAction)) {
9223 me->release();
9224 me = NULL;
9225 }
9226 return me;
9227 }
9228
9229 bool
init(IOService * inOwner,Action inAction)9230 IOPMCompletionQueue::init( IOService * inOwner, Action inAction )
9231 {
9232 if (!inAction || !IOEventSource::init(inOwner, (IOEventSourceAction)inAction)) {
9233 return false;
9234 }
9235
9236 queue_init(&fQueue);
9237 return true;
9238 }
9239
9240
9241 bool
queuePMRequest(IOPMRequest * request)9242 IOPMCompletionQueue::queuePMRequest( IOPMRequest * request )
9243 {
9244 bool more;
9245
9246 assert(request);
9247 // unblock dependent request
9248 more = request->detachNextRequest();
9249 queue_enter(&fQueue, request, typeof(request), fCommandChain);
9250 return more;
9251 }
9252
9253 bool
checkForWork(void)9254 IOPMCompletionQueue::checkForWork( void )
9255 {
9256 Action dqAction = (Action) action;
9257 IOPMRequest * request;
9258 IOPMRequest * next;
9259 IOService * target;
9260 bool more = false;
9261
9262 request = (typeof(request))queue_first(&fQueue);
9263 while (!queue_end(&fQueue, (queue_entry_t) request)) {
9264 next = (typeof(next))queue_next(&request->fCommandChain);
9265 if (!request->isFreeBlocked()) {
9266 queue_remove(&fQueue, request, typeof(request), fCommandChain);
9267 target = request->getTarget();
9268 assert(target);
9269 more |= (*dqAction)( target, request, this );
9270 }
9271 request = next;
9272 }
9273
9274 return more;
9275 }
9276
9277 #pragma clang diagnostic pop
9278
9279 // MARK: -
9280 // MARK: IOServicePM
9281
OSDefineMetaClassAndStructors(IOServicePM,OSObject)9282 OSDefineMetaClassAndStructors(IOServicePM, OSObject)
9283
9284 //*********************************************************************************
9285 // serialize
9286 //
9287 // Serialize IOServicePM for debugging.
9288 //*********************************************************************************
9289
9290 static void
9291 setPMProperty( OSDictionary * dict, const char * key, uint64_t value )
9292 {
9293 OSNumber * num = OSNumber::withNumber(value, sizeof(value) * 8);
9294 if (num) {
9295 dict->setObject(key, num);
9296 num->release();
9297 }
9298 }
9299
9300 IOReturn
gatedSerialize(OSSerialize * s) const9301 IOServicePM::gatedSerialize( OSSerialize * s ) const
9302 {
9303 OSDictionary * dict;
9304 bool ok = false;
9305 int powerClamp = -1;
9306 int dictSize = 6;
9307
9308 if (IdleTimerPeriod) {
9309 dictSize += 4;
9310 }
9311
9312 if (PMActions.state & kPMActionsStatePowerClamped) {
9313 dictSize += 1;
9314 powerClamp = 0;
9315 if (PMActions.flags &
9316 (kPMActionsFlagIsDisplayWrangler | kPMActionsFlagIsGraphicsDriver)) {
9317 powerClamp++;
9318 }
9319 }
9320
9321 #if WORK_QUEUE_STATS
9322 if (gIOPMRootNode == ControllingDriver) {
9323 dictSize += 4;
9324 }
9325 #endif
9326
9327 if (PowerClients) {
9328 dict = OSDictionary::withDictionary(
9329 PowerClients, PowerClients->getCount() + dictSize);
9330 } else {
9331 dict = OSDictionary::withCapacity(dictSize);
9332 }
9333
9334 if (dict) {
9335 setPMProperty(dict, "CurrentPowerState", CurrentPowerState);
9336 setPMProperty(dict, "CapabilityFlags", CurrentCapabilityFlags);
9337 if (NumberOfPowerStates) {
9338 setPMProperty(dict, "MaxPowerState", NumberOfPowerStates - 1);
9339 }
9340 if (DesiredPowerState != CurrentPowerState) {
9341 setPMProperty(dict, "DesiredPowerState", DesiredPowerState);
9342 }
9343 if (kIOPM_Finished != MachineState) {
9344 setPMProperty(dict, "MachineState", MachineState);
9345 }
9346 if (DeviceOverrideEnabled) {
9347 dict->setObject("PowerOverrideOn", kOSBooleanTrue);
9348 }
9349 if (powerClamp >= 0) {
9350 setPMProperty(dict, "PowerClamp", powerClamp);
9351 }
9352
9353 if (IdleTimerPeriod) {
9354 AbsoluteTime now;
9355 AbsoluteTime delta;
9356 uint64_t nsecs;
9357
9358 clock_get_uptime(&now);
9359
9360 // The idle timer period in milliseconds
9361 setPMProperty(dict, "IdleTimerPeriod", NextIdleTimerPeriod * 1000ULL);
9362
9363 // Number of tickles since the last idle timer expiration
9364 setPMProperty(dict, "ActivityTickles", ActivityTickleCount);
9365
9366 if (AbsoluteTime_to_scalar(&DeviceActiveTimestamp)) {
9367 // Milliseconds since the last activity tickle
9368 delta = now;
9369 SUB_ABSOLUTETIME(&delta, &DeviceActiveTimestamp);
9370 absolutetime_to_nanoseconds(delta, &nsecs);
9371 setPMProperty(dict, "TimeSinceLastTickle", NS_TO_MS(nsecs));
9372 }
9373
9374 if (!IdleTimerStopped && AbsoluteTime_to_scalar(&IdleTimerStartTime)) {
9375 // Idle timer elapsed time in milliseconds
9376 delta = now;
9377 SUB_ABSOLUTETIME(&delta, &IdleTimerStartTime);
9378 absolutetime_to_nanoseconds(delta, &nsecs);
9379 setPMProperty(dict, "IdleTimerElapsedTime", NS_TO_MS(nsecs));
9380 }
9381 }
9382
9383 #if WORK_QUEUE_STATS
9384 if (gIOPMRootNode == Owner) {
9385 setPMProperty(dict, "WQ-CheckForWork",
9386 gIOPMWorkQueue->fStatCheckForWork);
9387 setPMProperty(dict, "WQ-ScanEntries",
9388 gIOPMWorkQueue->fStatScanEntries);
9389 setPMProperty(dict, "WQ-QueueEmpty",
9390 gIOPMWorkQueue->fStatQueueEmpty);
9391 setPMProperty(dict, "WQ-NoWorkDone",
9392 gIOPMWorkQueue->fStatNoWorkDone);
9393 }
9394 #endif
9395
9396 if (HasAdvisoryDesire && !gIOPMAdvisoryTickleEnabled) {
9397 // Don't report advisory tickle when it has no influence
9398 dict->removeObject(gIOPMPowerClientAdvisoryTickle);
9399 }
9400
9401 ok = dict->serialize(s);
9402 dict->release();
9403 }
9404
9405 return ok ? kIOReturnSuccess : kIOReturnNoMemory;
9406 }
9407
9408 bool
serialize(OSSerialize * s) const9409 IOServicePM::serialize( OSSerialize * s ) const
9410 {
9411 IOReturn ret = kIOReturnNotReady;
9412
9413 if (gIOPMWatchDogThread == current_thread()) {
9414 // Calling without lock as this data is collected for debug purpose, before reboot.
9415 // The workloop is probably already hung in state machine.
9416 ret = gatedSerialize(s);
9417 } else if (gIOPMWorkLoop) {
9418 ret = gIOPMWorkLoop->runAction(
9419 OSMemberFunctionCast(IOWorkLoop::Action, this, &IOServicePM::gatedSerialize),
9420 (OSObject *) this, (void *) s);
9421 }
9422
9423 return kIOReturnSuccess == ret;
9424 }
9425
9426 void
pmPrint(uint32_t event,uintptr_t param1,uintptr_t param2) const9427 IOServicePM::pmPrint(
9428 uint32_t event,
9429 uintptr_t param1,
9430 uintptr_t param2 ) const
9431 {
9432 gPlatform->PMLog(Name, event, param1, param2);
9433 }
9434
9435 void
pmTrace(uint32_t event,uint32_t eventFunc,uintptr_t param1,uintptr_t param2) const9436 IOServicePM::pmTrace(
9437 uint32_t event,
9438 uint32_t eventFunc,
9439 uintptr_t param1,
9440 uintptr_t param2 ) const
9441 {
9442 uintptr_t nameAsArg = 0;
9443
9444 assert(event < KDBG_CODE_MAX);
9445 assert((eventFunc & ~KDBG_FUNC_MASK) == 0);
9446
9447 // Copy the first characters of the name into an uintptr_t.
9448 // NULL termination is not required.
9449 strncpy((char*)&nameAsArg, Name, sizeof(nameAsArg));
9450
9451 #if defined(XNU_TARGET_OS_OSX)
9452 KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, IODBG_POWER(event) | eventFunc, nameAsArg,
9453 (uintptr_t)Owner->getRegistryEntryID(), (uintptr_t)(OBFUSCATE(param1)),
9454 (uintptr_t)(OBFUSCATE(param2)), 0);
9455 #else
9456 IOTimeStampConstant(IODBG_POWER(event) | eventFunc, nameAsArg, (uintptr_t)Owner->getRegistryEntryID(), (uintptr_t)(OBFUSCATE(param1)), (uintptr_t)(OBFUSCATE(param2)));
9457 #endif
9458 }
9459