1 // SPDX-License-Identifier: GPL-2.0
4 * perf_event_tests (git://github.com/deater/perf_event_tests)
8 * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
9 * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
11 #define __SANE_USERSPACE_TYPES__
17 #include <sys/ioctl.h>
22 #include <linux/compiler.h>
23 #include <linux/hw_breakpoint.h>
28 #include "../perf-sys.h"
33 static noinline int test_function(void)
38 static void sig_handler(int signum __maybe_unused,
39 siginfo_t *oh __maybe_unused,
40 void *uc __maybe_unused)
45 static long long bp_count(int fd)
50 ret = read(fd, &count, sizeof(long long));
51 if (ret != sizeof(long long)) {
52 pr_debug("failed to read: %d\n", ret);
59 #define EXECUTIONS 10000
62 int test__bp_signal_overflow(struct test *test __maybe_unused, int subtest __maybe_unused)
64 struct perf_event_attr pe;
69 /* setup SIGIO signal handler */
70 memset(&sa, 0, sizeof(struct sigaction));
71 sa.sa_sigaction = (void *) sig_handler;
72 sa.sa_flags = SA_SIGINFO;
74 if (sigaction(SIGIO, &sa, NULL) < 0) {
75 pr_debug("failed setting up signal handler\n");
79 memset(&pe, 0, sizeof(struct perf_event_attr));
80 pe.type = PERF_TYPE_BREAKPOINT;
81 pe.size = sizeof(struct perf_event_attr);
84 pe.bp_type = HW_BREAKPOINT_X;
85 pe.bp_addr = (unsigned long) test_function;
86 pe.bp_len = sizeof(long);
88 pe.sample_period = THRESHOLD;
89 pe.sample_type = PERF_SAMPLE_IP;
93 pe.exclude_kernel = 1;
96 fd = sys_perf_event_open(&pe, 0, -1, -1,
97 perf_event_open_cloexec_flag());
99 pr_debug("failed opening event %llx\n", pe.config);
103 fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);
104 fcntl(fd, F_SETSIG, SIGIO);
105 fcntl(fd, F_SETOWN, getpid());
107 ioctl(fd, PERF_EVENT_IOC_RESET, 0);
108 ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
110 for (i = 0; i < EXECUTIONS; i++)
113 ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
115 count = bp_count(fd);
119 pr_debug("count %lld, overflow %d\n",
122 if (count != EXECUTIONS) {
123 pr_debug("\tWrong number of executions %lld != %d\n",
128 if (overflows != EXECUTIONS / THRESHOLD) {
129 pr_debug("\tWrong number of overflows %d != %d\n",
130 overflows, EXECUTIONS / THRESHOLD);
134 return fails ? TEST_FAIL : TEST_OK;