summaryrefslogtreecommitdiff
path: root/tools/perf/tests/bp_signal_overflow.c
blob: ca962559e845e03081295e4659c75401a6431377 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
// 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 "perf.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

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

	/* 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 = sizeof(long);

	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;
}