Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | // SPDX-License-Identifier: GPL-2.0 /* * Originally done by Vince Weaver <vincent.weaver@maine.edu> for * perf_event_tests (git://github.com/deater/perf_event_tests) */ /* * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu. */ #define __SANE_USERSPACE_TYPES__ #include <stdlib.h> #include <stdio.h> #include <unistd.h> #include <string.h> #include <sys/ioctl.h> #include <time.h> #include <fcntl.h> #include <signal.h> #include <sys/mman.h> #include <linux/compiler.h> #include <linux/hw_breakpoint.h> #include "tests.h" #include "debug.h" #include "event.h" #include "../perf-sys.h" #include "cloexec.h" static int overflows; static noinline int test_function(void) { return time(NULL); } static void sig_handler(int signum __maybe_unused, siginfo_t *oh __maybe_unused, void *uc __maybe_unused) { overflows++; } static long long bp_count(int fd) { long long count; int ret; ret = read(fd, &count, sizeof(long long)); if (ret != sizeof(long long)) { pr_debug("failed to read: %d\n", ret); return TEST_FAIL; } return count; } #define EXECUTIONS 10000 #define THRESHOLD 100 static int test__bp_signal_overflow(struct test_suite *test __maybe_unused, int subtest __maybe_unused) { struct perf_event_attr pe; struct sigaction sa; long long count; int fd, i, fails = 0; if (!BP_SIGNAL_IS_SUPPORTED) { pr_debug("Test not supported on this architecture"); return TEST_SKIP; } /* setup SIGIO signal handler */ memset(&sa, 0, sizeof(struct sigaction)); sa.sa_sigaction = (void *) sig_handler; sa.sa_flags = SA_SIGINFO; if (sigaction(SIGIO, &sa, NULL) < 0) { pr_debug("failed setting up signal handler\n"); return TEST_FAIL; } memset(&pe, 0, sizeof(struct perf_event_attr)); pe.type = PERF_TYPE_BREAKPOINT; pe.size = sizeof(struct perf_event_attr); pe.config = 0; pe.bp_type = HW_BREAKPOINT_X; pe.bp_addr = (unsigned long) test_function; pe.bp_len = sizeof(long); pe.sample_period = THRESHOLD; pe.sample_type = PERF_SAMPLE_IP; pe.wakeup_events = 1; pe.disabled = 1; pe.exclude_kernel = 1; pe.exclude_hv = 1; fd = sys_perf_event_open(&pe, 0, -1, -1, perf_event_open_cloexec_flag()); if (fd < 0) { pr_debug("failed opening event %llx\n", pe.config); return TEST_FAIL; } fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC); fcntl(fd, F_SETSIG, SIGIO); fcntl(fd, F_SETOWN, getpid()); ioctl(fd, PERF_EVENT_IOC_RESET, 0); ioctl(fd, PERF_EVENT_IOC_ENABLE, 0); for (i = 0; i < EXECUTIONS; i++) test_function(); ioctl(fd, PERF_EVENT_IOC_DISABLE, 0); count = bp_count(fd); close(fd); pr_debug("count %lld, overflow %d\n", count, overflows); if (count != EXECUTIONS) { pr_debug("\tWrong number of executions %lld != %d\n", count, EXECUTIONS); fails++; } if (overflows != EXECUTIONS / THRESHOLD) { pr_debug("\tWrong number of overflows %d != %d\n", overflows, EXECUTIONS / THRESHOLD); fails++; } return fails ? TEST_FAIL : TEST_OK; } DEFINE_SUITE("Breakpoint overflow sampling", bp_signal_overflow); |