Commit | Line | Data |
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06933e3a JO |
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 | ||
b3539d21 SB |
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 | ||
06933e3a JO |
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" | |
57480d2c | 27 | #include "cloexec.h" |
06933e3a JO |
28 | |
29 | static int overflows; | |
30 | ||
31 | __attribute__ ((noinline)) | |
32 | static int test_function(void) | |
33 | { | |
34 | return time(NULL); | |
35 | } | |
36 | ||
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 | ||
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 | ||
61 | int 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 | ||
57480d2c YD |
95 | fd = sys_perf_event_open(&pe, 0, -1, -1, |
96 | perf_event_open_cloexec_flag()); | |
06933e3a JO |
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 | } |