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#include "cloexec.h"
28
29static int overflows;
30
31__attribute__ ((noinline))
32static int test_function(void)
33{
34	return time(NULL);
35}
36
37static void sig_handler(int signum __maybe_unused,
38			siginfo_t *oh __maybe_unused,
39			void *uc __maybe_unused)
40{
41	overflows++;
42}
43
44static long long bp_count(int fd)
45{
46	long long count;
47	int ret;
48
49	ret = read(fd, &count, sizeof(long long));
50	if (ret != sizeof(long long)) {
51		pr_debug("failed to read: %d\n", ret);
52		return TEST_FAIL;
53	}
54
55	return count;
56}
57
58#define EXECUTIONS 10000
59#define THRESHOLD  100
60
61int test__bp_signal_overflow(void)
62{
63	struct perf_event_attr pe;
64	struct sigaction sa;
65	long long count;
66	int fd, i, fails = 0;
67
68	/* setup SIGIO signal handler */
69	memset(&sa, 0, sizeof(struct sigaction));
70	sa.sa_sigaction = (void *) sig_handler;
71	sa.sa_flags = SA_SIGINFO;
72
73	if (sigaction(SIGIO, &sa, NULL) < 0) {
74		pr_debug("failed setting up signal handler\n");
75		return TEST_FAIL;
76	}
77
78	memset(&pe, 0, sizeof(struct perf_event_attr));
79	pe.type = PERF_TYPE_BREAKPOINT;
80	pe.size = sizeof(struct perf_event_attr);
81
82	pe.config = 0;
83	pe.bp_type = HW_BREAKPOINT_X;
84	pe.bp_addr = (unsigned long) test_function;
85	pe.bp_len = sizeof(long);
86
87	pe.sample_period = THRESHOLD;
88	pe.sample_type = PERF_SAMPLE_IP;
89	pe.wakeup_events = 1;
90
91	pe.disabled = 1;
92	pe.exclude_kernel = 1;
93	pe.exclude_hv = 1;
94
95	fd = sys_perf_event_open(&pe, 0, -1, -1,
96				 perf_event_open_cloexec_flag());
97	if (fd < 0) {
98		pr_debug("failed opening event %llx\n", pe.config);
99		return TEST_FAIL;
100	}
101
102	fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);
103	fcntl(fd, F_SETSIG, SIGIO);
104	fcntl(fd, F_SETOWN, getpid());
105
106	ioctl(fd, PERF_EVENT_IOC_RESET, 0);
107	ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
108
109	for (i = 0; i < EXECUTIONS; i++)
110		test_function();
111
112	ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
113
114	count = bp_count(fd);
115
116	close(fd);
117
118	pr_debug("count %lld, overflow %d\n",
119		 count, overflows);
120
121	if (count != EXECUTIONS) {
122		pr_debug("\tWrong number of executions %lld != %d\n",
123		count, EXECUTIONS);
124		fails++;
125	}
126
127	if (overflows != EXECUTIONS / THRESHOLD) {
128		pr_debug("\tWrong number of overflows %d != %d\n",
129		overflows, EXECUTIONS / THRESHOLD);
130		fails++;
131	}
132
133	return fails ? TEST_FAIL : TEST_OK;
134}
135