1 /* 2 * Copyright (c) 2018 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 /* 30 * Test to validate that _COMM_PAGE_CPU_QUIESCENT_COUNTER ticks at least once per second 31 * 32 * <rdar://problem/42433973> 33 */ 34 35 #include <System/machine/cpu_capabilities.h> 36 37 #include <darwintest.h> 38 39 #include <stdio.h> 40 #include <stdint.h> 41 #include <unistd.h> 42 #include <sys/sysctl.h> 43 44 T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true)); 45 46 #ifndef _COMM_PAGE_CPU_QUIESCENT_COUNTER 47 48 T_DECL(test_quiescent_counter, "Validate that _COMM_PAGE_CPU_QUIESCENT_COUNTER increments", 49 T_META_CHECK_LEAKS(false)) 50 { 51 T_SKIP("_COMM_PAGE_CPU_QUIESCENT_COUNTER doesn't exist on this system"); 52 } 53 54 #else /* _COMM_PAGE_CPU_QUIESCENT_COUNTER */ 55 56 T_DECL(test_quiescent_counter, "Validate that _COMM_PAGE_CPU_QUIESCENT_COUNTER increments", 57 T_META_CHECK_LEAKS(false)) 58 { 59 int rv; 60 61 uint32_t cpu_checkin_min_interval = 0; /* set by sysctl hw.ncpu */ 62 63 size_t value_size = sizeof(cpu_checkin_min_interval); 64 rv = sysctlbyname("kern.cpu_checkin_interval", &cpu_checkin_min_interval, &value_size, NULL, 0); 65 T_ASSERT_POSIX_SUCCESS(rv, "sysctlbyname(kern.cpu_checkin_interval)"); 66 67 T_LOG("kern.cpu_checkin_interval is %d", cpu_checkin_min_interval); 68 69 T_ASSERT_GT(cpu_checkin_min_interval, 0, "kern.cpu_checkin_interval should be > 0"); 70 71 COMM_PAGE_SLOT_TYPE(uint64_t) commpage_addr = COMM_PAGE_SLOT(uint64_t, CPU_QUIESCENT_COUNTER); 72 73 T_LOG("address of _COMM_PAGE_CPU_QUIESCENT_COUNTER is %p", commpage_addr); 74 75 uint64_t counter = *commpage_addr; 76 uint64_t last_counter = counter; 77 T_LOG("first value of _COMM_PAGE_CPU_QUIESCENT_COUNTER is %llu", counter); 78 79 for (int i = 0; i < 10; i++) { 80 sleep(1); 81 82 last_counter = counter; 83 counter = *commpage_addr; 84 85 T_LOG("value of _COMM_PAGE_CPU_QUIESCENT_COUNTER is %llu", counter); 86 87 T_ASSERT_GT(counter, last_counter, "_COMM_PAGE_CPU_QUIESCENT_COUNTER must monotonically increase at least once per second"); 88 } 89 } 90 91 #endif /* _COMM_PAGE_CPU_QUIESCENT_COUNTER */ 92