[linux-block.git] / tools / perf / tests / bp_signal_overflow.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Originally done by Vince Weaver <vincent.weaver@maine.edu> for
 * perf_event_tests (git://github.com/deater/perf_event_tests)
 */

/*
 * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
 * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
 */
#define __SANE_USERSPACE_TYPES__

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <time.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/mman.h>
#include <linux/compiler.h>
#include <linux/hw_breakpoint.h>

#include "tests.h"
#include "debug.h"
#include "event.h"
#include "parse-events.h"
#include "../perf-sys.h"
#include "cloexec.h"

static int overflows;

static noinline int test_function(void)
{
	return time(NULL);
}

static void sig_handler(int signum __maybe_unused,
			siginfo_t *oh __maybe_unused,
			void *uc __maybe_unused)
{
	overflows++;
}

static long long bp_count(int fd)
{
	long long count;
	int ret;

	ret = read(fd, &count, sizeof(long long));
	if (ret != sizeof(long long)) {
		pr_debug("failed to read: %d\n", ret);
		return TEST_FAIL;
	}

	return count;
}

#define EXECUTIONS 10000
#define THRESHOLD  100

static int test__bp_signal_overflow(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
{
	struct perf_event_attr pe;
	struct sigaction sa;
	long long count;
	int fd, i, fails = 0;

	if (!BP_SIGNAL_IS_SUPPORTED) {
		pr_debug("Test not supported on this architecture");
		return TEST_SKIP;
	}

	/* setup SIGIO signal handler */
	memset(&sa, 0, sizeof(struct sigaction));
	sa.sa_sigaction = (void *) sig_handler;
	sa.sa_flags = SA_SIGINFO;

	if (sigaction(SIGIO, &sa, NULL) < 0) {
		pr_debug("failed setting up signal handler\n");
		return TEST_FAIL;
	}

	memset(&pe, 0, sizeof(struct perf_event_attr));
	pe.type = PERF_TYPE_BREAKPOINT;
	pe.size = sizeof(struct perf_event_attr);

	pe.config = 0;
	pe.bp_type = HW_BREAKPOINT_X;
	pe.bp_addr = (unsigned long) test_function;
	pe.bp_len = default_breakpoint_len();

	pe.sample_period = THRESHOLD;
	pe.sample_type = PERF_SAMPLE_IP;
	pe.wakeup_events = 1;

	pe.disabled = 1;
	pe.exclude_kernel = 1;
	pe.exclude_hv = 1;

	fd = sys_perf_event_open(&pe, 0, -1, -1,
				 perf_event_open_cloexec_flag());
	if (fd < 0) {
		pr_debug("failed opening event %llx\n", pe.config);
		return TEST_FAIL;
	}

	fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);
	fcntl(fd, F_SETSIG, SIGIO);
	fcntl(fd, F_SETOWN, getpid());

	ioctl(fd, PERF_EVENT_IOC_RESET, 0);
	ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);

	for (i = 0; i < EXECUTIONS; i++)
		test_function();

	ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);

	count = bp_count(fd);

	close(fd);

	pr_debug("count %lld, overflow %d\n",
		 count, overflows);

	if (count != EXECUTIONS) {
		pr_debug("\tWrong number of executions %lld != %d\n",
		count, EXECUTIONS);
		fails++;
	}

	if (overflows != EXECUTIONS / THRESHOLD) {
		pr_debug("\tWrong number of overflows %d != %d\n",
		overflows, EXECUTIONS / THRESHOLD);
		fails++;
	}

	return fails ? TEST_FAIL : TEST_OK;
}

DEFINE_SUITE("Breakpoint overflow sampling", bp_signal_overflow);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
06933e3a JO	2	/*
	3	* Originally done by Vince Weaver <vincent.weaver@maine.edu> for
	4	* perf_event_tests (git://github.com/deater/perf_event_tests)
	5	*/
	6
b3539d21 SB	7	/*
	8	* Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
	9	* 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
	10	*/
	11	#define __SANE_USERSPACE_TYPES__
	12
06933e3a JO	13	#include <stdlib.h>
	14	#include <stdio.h>
	15	#include <unistd.h>
	16	#include <string.h>
	17	#include <sys/ioctl.h>
	18	#include <time.h>
	19	#include <fcntl.h>
	20	#include <signal.h>
	21	#include <sys/mman.h>
	22	#include <linux/compiler.h>
	23	#include <linux/hw_breakpoint.h>
	24
	25	#include "tests.h"
	26	#include "debug.h"
8520a98d	27	#include "event.h"
70b27c75	28	#include "parse-events.h"
91854f9a	29	#include "../perf-sys.h"
57480d2c	30	#include "cloexec.h"
06933e3a JO	31
	32	static int overflows;
	33
9dd4ca47	34	static noinline int test_function(void)
06933e3a JO	35	{
	36	return time(NULL);
	37	}
	38
	39	static void sig_handler(int signum __maybe_unused,
	40	siginfo_t *oh __maybe_unused,
	41	void *uc __maybe_unused)
	42	{
	43	overflows++;
	44	}
	45
	46	static long long bp_count(int fd)
	47	{
	48	long long count;
	49	int ret;
	50
	51	ret = read(fd, &count, sizeof(long long));
	52	if (ret != sizeof(long long)) {
	53	pr_debug("failed to read: %d\n", ret);
	54	return TEST_FAIL;
	55	}
	56
	57	return count;
	58	}
	59
	60	#define EXECUTIONS 10000
	61	#define THRESHOLD 100
	62
33f44bfd	63	static int test__bp_signal_overflow(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
06933e3a JO	64	{
	65	struct perf_event_attr pe;
	66	struct sigaction sa;
	67	long long count;
	68	int fd, i, fails = 0;
	69
4935e2cd IR	70	if (!BP_SIGNAL_IS_SUPPORTED) {
	71	pr_debug("Test not supported on this architecture");
	72	return TEST_SKIP;
	73	}
	74
06933e3a JO	75	/* setup SIGIO signal handler */
	76	memset(&sa, 0, sizeof(struct sigaction));
	77	sa.sa_sigaction = (void *) sig_handler;
	78	sa.sa_flags = SA_SIGINFO;
	79
	80	if (sigaction(SIGIO, &sa, NULL) < 0) {
	81	pr_debug("failed setting up signal handler\n");
	82	return TEST_FAIL;
	83	}
	84
	85	memset(&pe, 0, sizeof(struct perf_event_attr));
	86	pe.type = PERF_TYPE_BREAKPOINT;
	87	pe.size = sizeof(struct perf_event_attr);
	88
	89	pe.config = 0;
	90	pe.bp_type = HW_BREAKPOINT_X;
	91	pe.bp_addr = (unsigned long) test_function;
70b27c75	92	pe.bp_len = default_breakpoint_len();
06933e3a JO	93
	94	pe.sample_period = THRESHOLD;
	95	pe.sample_type = PERF_SAMPLE_IP;
	96	pe.wakeup_events = 1;
	97
	98	pe.disabled = 1;
	99	pe.exclude_kernel = 1;
	100	pe.exclude_hv = 1;
	101
57480d2c YD	102	fd = sys_perf_event_open(&pe, 0, -1, -1,
57480d2c YD	103	perf_event_open_cloexec_flag());
06933e3a JO	104	if (fd < 0) {
	105	pr_debug("failed opening event %llx\n", pe.config);
	106	return TEST_FAIL;
	107	}
	108
	109	fcntl(fd, F_SETFL, O_RDWR\|O_NONBLOCK\|O_ASYNC);
	110	fcntl(fd, F_SETSIG, SIGIO);
	111	fcntl(fd, F_SETOWN, getpid());
	112
	113	ioctl(fd, PERF_EVENT_IOC_RESET, 0);
	114	ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
	115
	116	for (i = 0; i < EXECUTIONS; i++)
	117	test_function();
	118
	119	ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
	120
	121	count = bp_count(fd);
	122
	123	close(fd);
	124
	125	pr_debug("count %lld, overflow %d\n",
	126	count, overflows);
	127
	128	if (count != EXECUTIONS) {
	129	pr_debug("\tWrong number of executions %lld != %d\n",
	130	count, EXECUTIONS);
	131	fails++;
	132	}
	133
	134	if (overflows != EXECUTIONS / THRESHOLD) {
	135	pr_debug("\tWrong number of overflows %d != %d\n",
	136	overflows, EXECUTIONS / THRESHOLD);
	137	fails++;
	138	}
	139
	140	return fails ? TEST_FAIL : TEST_OK;
	141	}
d68f0365	142
4935e2cd	143	DEFINE_SUITE("Breakpoint overflow sampling", bp_signal_overflow);