1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <kern/cpu_data.h>
27 #include <kern/thread.h>
28 #include <kern/assert.h>
29 #include <mach/thread_status.h>
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/errno.h>
34 #include <sys/stat.h>
35 #include <sys/ioctl.h>
36 #include <sys/conf.h>
37 #include <sys/fcntl.h>
38 #include <miscfs/devfs/devfs.h>
39
40 #include <sys/dtrace.h>
41 #include <sys/dtrace_impl.h>
42
43 #include <sys/dtrace_glue.h>
44
45 #include <machine/pal_routines.h>
46
47 #if defined(__x86_64__)
48 extern x86_saved_state_t *find_kern_regs(thread_t);
49 #elif defined(__arm64__)
50 extern struct arm_saved_state *find_kern_regs(thread_t);
51 #else
52 #error Unknown architecture
53 #endif
54
55 extern void profile_init(void);
56
57 static dtrace_provider_id_t profile_id;
58
59 /*
60 * Regardless of platform, the stack frames look like this in the case of the
61 * profile provider:
62 *
63 * profile_fire
64 * cyclic_expire
65 * cyclic_fire
66 * [ cbe ]
67 * [ interrupt code ]
68 *
69 * On x86, there are five frames from the generic interrupt code; further, the
70 * interrupted instruction appears as its own stack frame, giving us a total of
71 * 10.
72 *
73 * On SPARC, the picture is further complicated because the compiler
74 * optimizes away tail-calls -- so the following frames are optimized away:
75 *
76 * profile_fire
77 * cyclic_expire
78 *
79 * This gives three frames. However, on DEBUG kernels, the cyclic_expire
80 * frame cannot be tail-call eliminated, yielding four frames in this case.
81 *
82 * All of the above constraints lead to the mess below. Yes, the profile
83 * provider should ideally figure this out on-the-fly by hitting one of its own
84 * probes and then walking its own stack trace. This is complicated, however,
85 * and the static definition doesn't seem to be overly brittle. Still, we
86 * allow for a manual override in case we get it completely wrong.
87 */
88
89 #if defined(__x86_64__)
90 #define PROF_ARTIFICIAL_FRAMES 9
91 #elif defined(__arm64__)
92 #define PROF_ARTIFICIAL_FRAMES 8
93 #else
94 #error Unknown architecture
95 #endif
96
97 #define PROF_NAMELEN 15
98
99 #define PROF_PROFILE 0
100 #define PROF_TICK 1
101 #define PROF_PREFIX_PROFILE "profile-"
102 #define PROF_PREFIX_TICK "tick-"
103
104 typedef struct profile_probe {
105 char prof_name[PROF_NAMELEN];
106 dtrace_id_t prof_id;
107 int prof_kind;
108 hrtime_t prof_interval;
109 cyclic_id_t prof_cyclic;
110 } profile_probe_t;
111
112 typedef struct profile_probe_percpu {
113 hrtime_t profc_expected;
114 hrtime_t profc_interval;
115 profile_probe_t *profc_probe;
116 } profile_probe_percpu_t;
117
118 hrtime_t profile_interval_min = NANOSEC / 5000; /* 5000 hz */
119 int profile_aframes = 0; /* override */
120
121 static int profile_rates[] = {
122 97, 199, 499, 997, 1999,
123 4001, 4999, 0, 0, 0,
124 0, 0, 0, 0, 0,
125 0, 0, 0, 0, 0
126 };
127
128 static int profile_ticks[] = {
129 1, 10, 100, 500, 1000,
130 5000, 0, 0, 0, 0,
131 0, 0, 0, 0, 0
132 };
133
134 /*
135 * profile_max defines the upper bound on the number of profile probes that
136 * can exist (this is to prevent malicious or clumsy users from exhausing
137 * system resources by creating a slew of profile probes). At mod load time,
138 * this gets its value from PROFILE_MAX_DEFAULT or profile-max-probes if it's
139 * present in the profile.conf file.
140 */
141 #define PROFILE_MAX_DEFAULT 1000 /* default max. number of probes */
142 static uint32_t profile_max; /* maximum number of profile probes */
143 static uint32_t profile_total; /* current number of profile probes */
144
145 static void
profile_fire(void * arg)146 profile_fire(void *arg)
147 {
148 profile_probe_percpu_t *pcpu = arg;
149 profile_probe_t *prof = pcpu->profc_probe;
150 hrtime_t late;
151
152 late = dtrace_gethrtime() - pcpu->profc_expected;
153 pcpu->profc_expected += pcpu->profc_interval;
154
155 #if defined(__x86_64__)
156 x86_saved_state_t *kern_regs = find_kern_regs(current_thread());
157
158 if (NULL != kern_regs) {
159 /* Kernel was interrupted. */
160 dtrace_probe(prof->prof_id, saved_state64(kern_regs)->isf.rip, 0x0, late, 0, 0);
161 } else {
162 pal_register_cache_state(current_thread(), VALID);
163 /* Possibly a user interrupt */
164 x86_saved_state_t *tagged_regs = (x86_saved_state_t *)find_user_regs(current_thread());
165
166 if (NULL == tagged_regs) {
167 /* Too bad, so sad, no useful interrupt state. */
168 dtrace_probe(prof->prof_id, 0xcafebabe,
169 0x0, late, 0, 0); /* XXX_BOGUS also see profile_usermode() below. */
170 } else if (is_saved_state64(tagged_regs)) {
171 x86_saved_state64_t *regs = saved_state64(tagged_regs);
172
173 dtrace_probe(prof->prof_id, 0x0, regs->isf.rip, late, 0, 0);
174 } else {
175 x86_saved_state32_t *regs = saved_state32(tagged_regs);
176
177 dtrace_probe(prof->prof_id, 0x0, regs->eip, late, 0, 0);
178 }
179 }
180 #elif defined(__arm64__)
181 {
182 arm_saved_state_t *arm_kern_regs = (arm_saved_state_t *) find_kern_regs(current_thread());
183
184 // We should only come in here from interrupt context, so we should always have valid kernel regs
185 assert(NULL != arm_kern_regs);
186
187 if (saved_state64(arm_kern_regs)->cpsr & 0xF) {
188 /* Kernel was interrupted. */
189 dtrace_probe(prof->prof_id, saved_state64(arm_kern_regs)->pc, 0x0, late, 0, 0);
190 } else {
191 /* Possibly a user interrupt */
192 arm_saved_state_t *arm_user_regs = (arm_saved_state_t *)find_user_regs(current_thread());
193
194 if (NULL == arm_user_regs) {
195 /* Too bad, so sad, no useful interrupt state. */
196 dtrace_probe(prof->prof_id, 0xcafebabe, 0x0, late, 0, 0); /* XXX_BOGUS also see profile_usermode() below. */
197 } else {
198 dtrace_probe(prof->prof_id, 0x0, get_saved_state_pc(arm_user_regs), late, 0, 0);
199 }
200 }
201 }
202 #else
203 #error Unknown architecture
204 #endif
205 }
206
207 static void
profile_tick(void * arg)208 profile_tick(void *arg)
209 {
210 profile_probe_t *prof = arg;
211
212 #if defined(__x86_64__)
213 x86_saved_state_t *kern_regs = find_kern_regs(current_thread());
214
215 if (NULL != kern_regs) {
216 /* Kernel was interrupted. */
217 dtrace_probe(prof->prof_id, saved_state64(kern_regs)->isf.rip, 0x0, 0, 0, 0);
218 } else {
219 pal_register_cache_state(current_thread(), VALID);
220 /* Possibly a user interrupt */
221 x86_saved_state_t *tagged_regs = (x86_saved_state_t *)find_user_regs(current_thread());
222
223 if (NULL == tagged_regs) {
224 /* Too bad, so sad, no useful interrupt state. */
225 dtrace_probe(prof->prof_id, 0xcafebabe,
226 0x0, 0, 0, 0); /* XXX_BOGUS also see profile_usermode() below. */
227 } else if (is_saved_state64(tagged_regs)) {
228 x86_saved_state64_t *regs = saved_state64(tagged_regs);
229
230 dtrace_probe(prof->prof_id, 0x0, regs->isf.rip, 0, 0, 0);
231 } else {
232 x86_saved_state32_t *regs = saved_state32(tagged_regs);
233
234 dtrace_probe(prof->prof_id, 0x0, regs->eip, 0, 0, 0);
235 }
236 }
237 #elif defined(__arm64__)
238 {
239 arm_saved_state_t *arm_kern_regs = (arm_saved_state_t *) find_kern_regs(current_thread());
240
241 if (NULL != arm_kern_regs) {
242 /* Kernel was interrupted. */
243 dtrace_probe(prof->prof_id, saved_state64(arm_kern_regs)->pc, 0x0, 0, 0, 0);
244 } else {
245 /* Possibly a user interrupt */
246 arm_saved_state_t *arm_user_regs = (arm_saved_state_t *)find_user_regs(current_thread());
247
248 if (NULL == arm_user_regs) {
249 /* Too bad, so sad, no useful interrupt state. */
250 dtrace_probe(prof->prof_id, 0xcafebabe, 0x0, 0, 0, 0); /* XXX_BOGUS also see profile_usermode() below. */
251 } else {
252 dtrace_probe(prof->prof_id, 0x0, get_saved_state_pc(arm_user_regs), 0, 0, 0);
253 }
254 }
255 }
256
257 #else
258 #error Unknown architecture
259 #endif
260 }
261
262 static void
profile_create(hrtime_t interval,const char * name,int kind)263 profile_create(hrtime_t interval, const char *name, int kind)
264 {
265 profile_probe_t *prof;
266
267 if (interval < profile_interval_min) {
268 return;
269 }
270
271 if (dtrace_probe_lookup(profile_id, NULL, NULL, name) != 0) {
272 return;
273 }
274
275 os_atomic_inc(&profile_total, relaxed);
276 if (profile_total > profile_max) {
277 os_atomic_dec(&profile_total, relaxed);
278 return;
279 }
280
281 if (PROF_TICK == kind) {
282 prof = kmem_zalloc(sizeof(profile_probe_t), KM_SLEEP);
283 } else {
284 prof = kmem_zalloc(sizeof(profile_probe_t) + NCPU * sizeof(profile_probe_percpu_t), KM_SLEEP);
285 }
286
287 (void) strlcpy(prof->prof_name, name, sizeof(prof->prof_name));
288 prof->prof_interval = interval;
289 prof->prof_cyclic = CYCLIC_NONE;
290 prof->prof_kind = kind;
291 prof->prof_id = dtrace_probe_create(profile_id,
292 NULL, NULL, name,
293 profile_aframes ? profile_aframes : PROF_ARTIFICIAL_FRAMES, prof);
294 }
295
296 /*ARGSUSED*/
297 static void
profile_provide(void * arg,const dtrace_probedesc_t * desc)298 profile_provide(void *arg, const dtrace_probedesc_t *desc)
299 {
300 #pragma unused(arg) /* __APPLE__ */
301 int i, j, rate, kind;
302 hrtime_t val = 0, mult = 1, len;
303 const char *name, *suffix = NULL;
304
305 const struct {
306 const char *prefix;
307 int kind;
308 } types[] = {
309 { PROF_PREFIX_PROFILE, PROF_PROFILE },
310 { PROF_PREFIX_TICK, PROF_TICK },
311 { NULL, 0 }
312 };
313
314 const struct {
315 const char *name;
316 hrtime_t mult;
317 } suffixes[] = {
318 { "ns", NANOSEC / NANOSEC },
319 { "nsec", NANOSEC / NANOSEC },
320 { "us", NANOSEC / MICROSEC },
321 { "usec", NANOSEC / MICROSEC },
322 { "ms", NANOSEC / MILLISEC },
323 { "msec", NANOSEC / MILLISEC },
324 { "s", NANOSEC / SEC },
325 { "sec", NANOSEC / SEC },
326 { "m", NANOSEC * (hrtime_t)60 },
327 { "min", NANOSEC * (hrtime_t)60 },
328 { "h", NANOSEC * (hrtime_t)(60 * 60) },
329 { "hour", NANOSEC * (hrtime_t)(60 * 60) },
330 { "d", NANOSEC * (hrtime_t)(24 * 60 * 60) },
331 { "day", NANOSEC * (hrtime_t)(24 * 60 * 60) },
332 { "hz", 0 },
333 { NULL, 0 }
334 };
335
336 if (desc == NULL) {
337 char n[PROF_NAMELEN];
338
339 /*
340 * If no description was provided, provide all of our probes.
341 */
342 for (i = 0; i < (int)(sizeof(profile_rates) / sizeof(int)); i++) {
343 if ((rate = profile_rates[i]) == 0) {
344 continue;
345 }
346
347 (void) snprintf(n, PROF_NAMELEN, "%s%d",
348 PROF_PREFIX_PROFILE, rate);
349 profile_create(NANOSEC / rate, n, PROF_PROFILE);
350 }
351
352 for (i = 0; i < (int)(sizeof(profile_ticks) / sizeof(int)); i++) {
353 if ((rate = profile_ticks[i]) == 0) {
354 continue;
355 }
356
357 (void) snprintf(n, PROF_NAMELEN, "%s%d",
358 PROF_PREFIX_TICK, rate);
359 profile_create(NANOSEC / rate, n, PROF_TICK);
360 }
361
362 return;
363 }
364
365 name = desc->dtpd_name;
366
367 for (i = 0; types[i].prefix != NULL; i++) {
368 len = strlen(types[i].prefix);
369
370 if (strncmp(name, types[i].prefix, len) != 0) {
371 continue;
372 }
373 break;
374 }
375
376 if (types[i].prefix == NULL) {
377 return;
378 }
379
380 kind = types[i].kind;
381 j = strlen(name) - len;
382
383 /*
384 * We need to start before any time suffix.
385 */
386 for (j = strlen(name); j >= len; j--) {
387 if (name[j] >= '0' && name[j] <= '9') {
388 break;
389 }
390 suffix = &name[j];
391 }
392
393 if (!suffix) {
394 suffix = &name[strlen(name)];
395 }
396
397 /*
398 * Now determine the numerical value present in the probe name.
399 */
400 for (; j >= len; j--) {
401 if (name[j] < '0' || name[j] > '9') {
402 return;
403 }
404
405 val += (name[j] - '0') * mult;
406 mult *= (hrtime_t)10;
407 }
408
409 if (val == 0) {
410 return;
411 }
412
413 /*
414 * Look-up the suffix to determine the multiplier.
415 */
416 for (i = 0, mult = 0; suffixes[i].name != NULL; i++) {
417 /* APPLE NOTE: Darwin employs size bounded string operations */
418 if (strncasecmp(suffixes[i].name, suffix, strlen(suffixes[i].name) + 1) == 0) {
419 mult = suffixes[i].mult;
420 break;
421 }
422 }
423
424 if (suffixes[i].name == NULL && *suffix != '\0') {
425 return;
426 }
427
428 if (mult == 0) {
429 /*
430 * The default is frequency-per-second.
431 */
432 val = NANOSEC / val;
433 } else {
434 val *= mult;
435 }
436
437 profile_create(val, name, kind);
438 }
439
440 /*ARGSUSED*/
441 static void
profile_destroy(void * arg,dtrace_id_t id,void * parg)442 profile_destroy(void *arg, dtrace_id_t id, void *parg)
443 {
444 #pragma unused(arg,id) /* __APPLE__ */
445 profile_probe_t *prof = parg;
446
447 ASSERT(prof->prof_cyclic == CYCLIC_NONE);
448
449 if (prof->prof_kind == PROF_TICK) {
450 kmem_free(prof, sizeof(profile_probe_t));
451 } else {
452 kmem_free(prof, sizeof(profile_probe_t) + NCPU * sizeof(profile_probe_percpu_t));
453 }
454
455 ASSERT(profile_total >= 1);
456 os_atomic_dec(&profile_total, relaxed);
457 }
458
459 /*ARGSUSED*/
460 static void
profile_online(void * arg,dtrace_cpu_t * cpu,cyc_handler_t * hdlr,cyc_time_t * when)461 profile_online(void *arg, dtrace_cpu_t *cpu, cyc_handler_t *hdlr, cyc_time_t *when)
462 {
463 #pragma unused(cpu) /* __APPLE__ */
464 profile_probe_t *prof = arg;
465 profile_probe_percpu_t *pcpu;
466
467 pcpu = ((profile_probe_percpu_t *)(&(prof[1]))) + cpu_number();
468 pcpu->profc_probe = prof;
469
470 hdlr->cyh_func = profile_fire;
471 hdlr->cyh_arg = pcpu;
472 hdlr->cyh_level = CY_HIGH_LEVEL;
473
474 when->cyt_interval = prof->prof_interval;
475 when->cyt_when = dtrace_gethrtime() + when->cyt_interval;
476
477 pcpu->profc_expected = when->cyt_when;
478 pcpu->profc_interval = when->cyt_interval;
479 }
480
481 /*ARGSUSED*/
482 static void
profile_offline(void * arg,dtrace_cpu_t * cpu,void * oarg)483 profile_offline(void *arg, dtrace_cpu_t *cpu, void *oarg)
484 {
485 profile_probe_percpu_t *pcpu = oarg;
486
487 ASSERT(pcpu->profc_probe == arg);
488 #pragma unused(pcpu,arg,cpu) /* __APPLE__ */
489 }
490
491 /*ARGSUSED*/
492 static int
profile_enable(void * arg,dtrace_id_t id,void * parg)493 profile_enable(void *arg, dtrace_id_t id, void *parg)
494 {
495 #pragma unused(arg,id) /* __APPLE__ */
496 profile_probe_t *prof = parg;
497 cyc_omni_handler_t omni;
498 cyc_handler_t hdlr;
499 cyc_time_t when;
500
501 ASSERT(prof->prof_interval != 0);
502 ASSERT(MUTEX_HELD(&cpu_lock));
503
504 if (prof->prof_kind == PROF_TICK) {
505 hdlr.cyh_func = profile_tick;
506 hdlr.cyh_arg = prof;
507 hdlr.cyh_level = CY_HIGH_LEVEL;
508
509 when.cyt_interval = prof->prof_interval;
510 #if !defined(__APPLE__)
511 when.cyt_when = dtrace_gethrtime() + when.cyt_interval;
512 #else
513 when.cyt_when = 0;
514 #endif /* __APPLE__ */
515 } else {
516 ASSERT(prof->prof_kind == PROF_PROFILE);
517 omni.cyo_online = profile_online;
518 omni.cyo_offline = profile_offline;
519 omni.cyo_arg = prof;
520 }
521
522 if (prof->prof_kind == PROF_TICK) {
523 prof->prof_cyclic = cyclic_timer_add(&hdlr, &when);
524 } else {
525 prof->prof_cyclic = (cyclic_id_t)cyclic_add_omni(&omni); /* cast puns cyclic_id_list_t with cyclic_id_t */
526 }
527
528 return 0;
529 }
530
531 /*ARGSUSED*/
532 static void
profile_disable(void * arg,dtrace_id_t id,void * parg)533 profile_disable(void *arg, dtrace_id_t id, void *parg)
534 {
535 profile_probe_t *prof = parg;
536
537 ASSERT(prof->prof_cyclic != CYCLIC_NONE);
538 ASSERT(MUTEX_HELD(&cpu_lock));
539
540 #pragma unused(arg,id)
541 if (prof->prof_kind == PROF_TICK) {
542 cyclic_timer_remove(prof->prof_cyclic);
543 } else {
544 cyclic_remove_omni((cyclic_id_list_t)prof->prof_cyclic); /* cast puns cyclic_id_list_t with cyclic_id_t */
545 }
546 prof->prof_cyclic = CYCLIC_NONE;
547 }
548
549 static uint64_t
profile_getarg(void * arg,dtrace_id_t id,void * parg,int argno,int aframes)550 profile_getarg(void *arg, dtrace_id_t id, void *parg, int argno, int aframes)
551 {
552 #pragma unused(arg, id, parg, argno, aframes)
553 /*
554 * All the required arguments for the profile probe are passed directly
555 * to dtrace_probe, and we do not go through dtrace_getarg which doesn't
556 * know how to hop to the kernel stack from the interrupt stack like
557 * dtrace_getpcstack
558 */
559 return 0;
560 }
561
562 static void
profile_getargdesc(void * arg,dtrace_id_t id,void * parg,dtrace_argdesc_t * desc)563 profile_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc)
564 {
565 #pragma unused(arg, id)
566 profile_probe_t *prof = parg;
567 const char *argdesc = NULL;
568 switch (desc->dtargd_ndx) {
569 case 0:
570 argdesc = "void*";
571 break;
572 case 1:
573 argdesc = "user_addr_t";
574 break;
575 case 2:
576 if (prof->prof_kind == PROF_PROFILE) {
577 argdesc = "hrtime_t";
578 }
579 break;
580 }
581 if (argdesc) {
582 strlcpy(desc->dtargd_native, argdesc, DTRACE_ARGTYPELEN);
583 } else {
584 desc->dtargd_ndx = DTRACE_ARGNONE;
585 }
586 }
587
588 /*
589 * APPLE NOTE: profile_usermode call not supported.
590 */
591 static int
profile_usermode(void * arg,dtrace_id_t id,void * parg)592 profile_usermode(void *arg, dtrace_id_t id, void *parg)
593 {
594 #pragma unused(arg,id,parg)
595 return 1; /* XXX_BOGUS */
596 }
597
598 static dtrace_pattr_t profile_attr = {
599 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
600 { DTRACE_STABILITY_UNSTABLE, DTRACE_STABILITY_UNSTABLE, DTRACE_CLASS_UNKNOWN },
601 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
602 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
603 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
604 };
605
606 static dtrace_pops_t profile_pops = {
607 .dtps_provide = profile_provide,
608 .dtps_provide_module = NULL,
609 .dtps_enable = profile_enable,
610 .dtps_disable = profile_disable,
611 .dtps_suspend = NULL,
612 .dtps_resume = NULL,
613 .dtps_getargdesc = profile_getargdesc,
614 .dtps_getargval = profile_getarg,
615 .dtps_usermode = profile_usermode,
616 .dtps_destroy = profile_destroy
617 };
618
619 static int
profile_attach(dev_info_t * devi)620 profile_attach(dev_info_t *devi)
621 {
622 if (ddi_create_minor_node(devi, "profile", S_IFCHR, 0,
623 DDI_PSEUDO, 0) == DDI_FAILURE ||
624 dtrace_register("profile", &profile_attr,
625 DTRACE_PRIV_KERNEL | DTRACE_PRIV_USER, NULL,
626 &profile_pops, NULL, &profile_id) != 0) {
627 ddi_remove_minor_node(devi, NULL);
628 return DDI_FAILURE;
629 }
630
631 profile_max = PROFILE_MAX_DEFAULT;
632
633 return DDI_SUCCESS;
634 }
635
636 /*
637 * APPLE NOTE: profile_detach not implemented
638 */
639 #if !defined(__APPLE__)
640 static int
profile_detach(dev_info_t * devi,ddi_detach_cmd_t cmd)641 profile_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
642 {
643 switch (cmd) {
644 case DDI_DETACH:
645 break;
646 case DDI_SUSPEND:
647 return DDI_SUCCESS;
648 default:
649 return DDI_FAILURE;
650 }
651
652 if (dtrace_unregister(profile_id) != 0) {
653 return DDI_FAILURE;
654 }
655
656 ddi_remove_minor_node(devi, NULL);
657 return DDI_SUCCESS;
658 }
659 #endif /* __APPLE__ */
660
661 d_open_t _profile_open;
662
663 int
_profile_open(dev_t dev,int flags,int devtype,struct proc * p)664 _profile_open(dev_t dev, int flags, int devtype, struct proc *p)
665 {
666 #pragma unused(dev,flags,devtype,p)
667 return 0;
668 }
669
670 #define PROFILE_MAJOR -24 /* let the kernel pick the device number */
671
672 static const struct cdevsw profile_cdevsw =
673 {
674 .d_open = _profile_open,
675 .d_close = eno_opcl,
676 .d_read = eno_rdwrt,
677 .d_write = eno_rdwrt,
678 .d_ioctl = eno_ioctl,
679 .d_stop = eno_stop,
680 .d_reset = eno_reset,
681 .d_select = eno_select,
682 .d_mmap = eno_mmap,
683 .d_strategy = eno_strat,
684 .d_reserved_1 = eno_getc,
685 .d_reserved_2 = eno_putc,
686 };
687
688 void
profile_init(void)689 profile_init( void )
690 {
691 int majdevno = cdevsw_add(PROFILE_MAJOR, &profile_cdevsw);
692
693 if (majdevno < 0) {
694 printf("profile_init: failed to allocate a major number!\n");
695 return;
696 }
697
698 profile_attach((dev_info_t*)(uintptr_t)majdevno);
699 }
700 #undef PROFILE_MAJOR
701