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	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	#ifndef _COMM_PAGE_CPU_QUIESCENT_COUNTER
	45
	46	T_DECL(test_quiescent_counter, "Validate that _COMM_PAGE_CPU_QUIESCENT_COUNTER increments",
	47	T_META_CHECK_LEAKS(false))
	48	{
	49	T_SKIP("_COMM_PAGE_CPU_QUIESCENT_COUNTER doesn't exist on this system");
	50	}
	51
	52	#else /* _COMM_PAGE_CPU_QUIESCENT_COUNTER */
	53
	54	T_DECL(test_quiescent_counter, "Validate that _COMM_PAGE_CPU_QUIESCENT_COUNTER increments",
	55	T_META_CHECK_LEAKS(false))
	56	{
	57	int rv;
	58
	59	uint32_t cpu_checkin_min_interval = 0; /* set by sysctl hw.ncpu */
	60
	61	size_t value_size = sizeof(cpu_checkin_min_interval);
	62	rv = sysctlbyname("kern.cpu_checkin_interval", &cpu_checkin_min_interval, &value_size, NULL, 0);
	63	T_ASSERT_POSIX_SUCCESS(rv, "sysctlbyname(kern.cpu_checkin_interval)");
	64
	65	T_LOG("kern.cpu_checkin_interval is %d", cpu_checkin_min_interval);
	66
	67	T_ASSERT_GT(cpu_checkin_min_interval, 0, "kern.cpu_checkin_interval should be > 0");
	68
	69	uint64_t* commpage_addr = (uint64_t *)(uintptr_t)_COMM_PAGE_CPU_QUIESCENT_COUNTER;
	70
	71	T_LOG("address of _COMM_PAGE_CPU_QUIESCENT_COUNTER is %p", (void*) commpage_addr);
	72
	73	uint64_t counter = *commpage_addr;
	74	uint64_t last_counter = counter;
	75	T_LOG("first value of _COMM_PAGE_CPU_QUIESCENT_COUNTER is %llu", counter);
	76
	77	for (int i = 0; i < 10; i++) {
	78	sleep(1);
	79
	80	last_counter = counter;
	81	counter = *commpage_addr;
	82
	83	T_LOG("value of _COMM_PAGE_CPU_QUIESCENT_COUNTER is %llu", counter);
	84
	85	T_ASSERT_GT(counter, last_counter, "_COMM_PAGE_CPU_QUIESCENT_COUNTER must monotonically increase at least once per second");
	86	}
	87	}
	88
	89	#endif /* _COMM_PAGE_CPU_QUIESCENT_COUNTER */