1 // SPDX-License-Identifier: GPL-2.0
3 * Originally done by Vince Weaver <vincent.weaver@maine.edu> for
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>
32 static noinline int test_function(void)
37 static void sig_handler(int signum __maybe_unused,
38 siginfo_t *oh __maybe_unused,
39 void *uc __maybe_unused)
44 static long long bp_count(int fd)
49 ret = read(fd, &count, sizeof(long long));
50 if (ret != sizeof(long long)) {
51 pr_debug("failed to read: %d\n", ret);
58 #define EXECUTIONS 10000
61 int test__bp_signal_overflow(struct test *test __maybe_unused, int subtest __maybe_unused)
63 struct perf_event_attr pe;
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;
73 if (sigaction(SIGIO, &sa, NULL) < 0) {
74 pr_debug("failed setting up signal handler\n");
78 memset(&pe, 0, sizeof(struct perf_event_attr));
79 pe.type = PERF_TYPE_BREAKPOINT;
80 pe.size = sizeof(struct perf_event_attr);
83 pe.bp_type = HW_BREAKPOINT_X;
84 pe.bp_addr = (unsigned long) test_function;
85 pe.bp_len = sizeof(long);
87 pe.sample_period = THRESHOLD;
88 pe.sample_type = PERF_SAMPLE_IP;
92 pe.exclude_kernel = 1;
95 fd = sys_perf_event_open(&pe, 0, -1, -1,
96 perf_event_open_cloexec_flag());
98 pr_debug("failed opening event %llx\n", pe.config);
102 fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);
103 fcntl(fd, F_SETSIG, SIGIO);
104 fcntl(fd, F_SETOWN, getpid());
106 ioctl(fd, PERF_EVENT_IOC_RESET, 0);
107 ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
109 for (i = 0; i < EXECUTIONS; i++)
112 ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
114 count = bp_count(fd);
118 pr_debug("count %lld, overflow %d\n",
121 if (count != EXECUTIONS) {
122 pr_debug("\tWrong number of executions %lld != %d\n",
127 if (overflows != EXECUTIONS / THRESHOLD) {
128 pr_debug("\tWrong number of overflows %d != %d\n",
129 overflows, EXECUTIONS / THRESHOLD);
133 return fails ? TEST_FAIL : TEST_OK;