1/*
2 * Originally done by Vince Weaver <vincent.weaver@maine.edu> for
3 * perf_event_tests (git://github.com/deater/perf_event_tests)
4 */
5
6/*
7 * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
8 * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
9 */
10#define __SANE_USERSPACE_TYPES__
11
12#include <stdlib.h>
13#include <stdio.h>
14#include <unistd.h>
15#include <string.h>
16#include <sys/ioctl.h>
17#include <time.h>
18#include <fcntl.h>
19#include <signal.h>
20#include <sys/mman.h>
21#include <linux/compiler.h>
22#include <linux/hw_breakpoint.h>
23
24#include "tests.h"
25#include "debug.h"
26#include "perf.h"
27
28static int overflows;
29
30__attribute__ ((noinline))
31static int test_function(void)
32{
33	return time(NULL);
34}
35
36static void sig_handler(int signum __maybe_unused,
37			siginfo_t *oh __maybe_unused,
38			void *uc __maybe_unused)
39{
40	overflows++;
41}
42
43static long long bp_count(int fd)
44{
45	long long count;
46	int ret;
47
48	ret = read(fd, &count, sizeof(long long));
49	if (ret != sizeof(long long)) {
50		pr_debug("failed to read: %d\n", ret);
51		return TEST_FAIL;
52	}
53
54	return count;
55}
56
57#define EXECUTIONS 10000
58#define THRESHOLD  100
59
60int test__bp_signal_overflow(void)
61{
62	struct perf_event_attr pe;
63	struct sigaction sa;
64	long long count;
65	int fd, i, fails = 0;
66
67	/* setup SIGIO signal handler */
68	memset(&sa, 0, sizeof(struct sigaction));
69	sa.sa_sigaction = (void *) sig_handler;
70	sa.sa_flags = SA_SIGINFO;
71
72	if (sigaction(SIGIO, &sa, NULL) < 0) {
73		pr_debug("failed setting up signal handler\n");
74		return TEST_FAIL;
75	}
76
77	memset(&pe, 0, sizeof(struct perf_event_attr));
78	pe.type = PERF_TYPE_BREAKPOINT;
79	pe.size = sizeof(struct perf_event_attr);
80
81	pe.config = 0;
82	pe.bp_type = HW_BREAKPOINT_X;
83	pe.bp_addr = (unsigned long) test_function;
84	pe.bp_len = sizeof(long);
85
86	pe.sample_period = THRESHOLD;
87	pe.sample_type = PERF_SAMPLE_IP;
88	pe.wakeup_events = 1;
89
90	pe.disabled = 1;
91	pe.exclude_kernel = 1;
92	pe.exclude_hv = 1;
93
94	fd = sys_perf_event_open(&pe, 0, -1, -1, 0);
95	if (fd < 0) {
96		pr_debug("failed opening event %llx\n", pe.config);
97		return TEST_FAIL;
98	}
99
100	fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);
101	fcntl(fd, F_SETSIG, SIGIO);
102	fcntl(fd, F_SETOWN, getpid());
103
104	ioctl(fd, PERF_EVENT_IOC_RESET, 0);
105	ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
106
107	for (i = 0; i < EXECUTIONS; i++)
108		test_function();
109
110	ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
111
112	count = bp_count(fd);
113
114	close(fd);
115
116	pr_debug("count %lld, overflow %d\n",
117		 count, overflows);
118
119	if (count != EXECUTIONS) {
120		pr_debug("\tWrong number of executions %lld != %d\n",
121		count, EXECUTIONS);
122		fails++;
123	}
124
125	if (overflows != EXECUTIONS / THRESHOLD) {
126		pr_debug("\tWrong number of overflows %d != %d\n",
127		overflows, EXECUTIONS / THRESHOLD);
128		fails++;
129	}
130
131	return fails ? TEST_FAIL : TEST_OK;
132}
133