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
29 static int overflows;
30
31 __attribute__ ((noinline))
test_function(void)32 static int test_function(void)
33 {
34 return time(NULL);
35 }
36
sig_handler(int signum __maybe_unused,siginfo_t * oh __maybe_unused,void * uc __maybe_unused)37 static void sig_handler(int signum __maybe_unused,
38 siginfo_t *oh __maybe_unused,
39 void *uc __maybe_unused)
40 {
41 overflows++;
42 }
43
bp_count(int fd)44 static 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
test__bp_signal_overflow(int subtest __maybe_unused)61 int test__bp_signal_overflow(int subtest __maybe_unused)
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