1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Originally done by Vince Weaver <vincent.weaver@maine.edu> for 4 * perf_event_tests (git://github.com/deater/perf_event_tests) 5 */ 6 7 /* 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. 10 */ 11 #define __SANE_USERSPACE_TYPES__ 12 13 #include <stdlib.h> 14 #include <stdio.h> 15 #include <unistd.h> 16 #include <string.h> 17 #include <sys/ioctl.h> 18 #include <time.h> 19 #include <fcntl.h> 20 #include <signal.h> 21 #include <sys/mman.h> 22 #include <linux/compiler.h> 23 #include <linux/hw_breakpoint.h> 24 25 #include "tests.h" 26 #include "debug.h" 27 #include "event.h" 28 #include "parse-events.h" 29 #include "../perf-sys.h" 30 #include "cloexec.h" 31 32 static int overflows; 33 34 static noinline int test_function(void) 35 { 36 return time(NULL); 37 } 38 39 static void sig_handler(int signum __maybe_unused, 40 siginfo_t *oh __maybe_unused, 41 void *uc __maybe_unused) 42 { 43 overflows++; 44 } 45 46 static long long bp_count(int fd) 47 { 48 long long count; 49 int ret; 50 51 ret = read(fd, &count, sizeof(long long)); 52 if (ret != sizeof(long long)) { 53 pr_debug("failed to read: %d\n", ret); 54 return TEST_FAIL; 55 } 56 57 return count; 58 } 59 60 #define EXECUTIONS 10000 61 #define THRESHOLD 100 62 63 static int test__bp_signal_overflow(struct test_suite *test __maybe_unused, int subtest __maybe_unused) 64 { 65 struct perf_event_attr pe; 66 struct sigaction sa; 67 long long count; 68 int fd, i, fails = 0; 69 70 if (!BP_SIGNAL_IS_SUPPORTED) { 71 pr_debug("Test not supported on this architecture"); 72 return TEST_SKIP; 73 } 74 75 /* setup SIGIO signal handler */ 76 memset(&sa, 0, sizeof(struct sigaction)); 77 sa.sa_sigaction = (void *) sig_handler; 78 sa.sa_flags = SA_SIGINFO; 79 80 if (sigaction(SIGIO, &sa, NULL) < 0) { 81 pr_debug("failed setting up signal handler\n"); 82 return TEST_FAIL; 83 } 84 85 memset(&pe, 0, sizeof(struct perf_event_attr)); 86 pe.type = PERF_TYPE_BREAKPOINT; 87 pe.size = sizeof(struct perf_event_attr); 88 89 pe.config = 0; 90 pe.bp_type = HW_BREAKPOINT_X; 91 pe.bp_addr = (unsigned long) test_function; 92 pe.bp_len = default_breakpoint_len(); 93 94 pe.sample_period = THRESHOLD; 95 pe.sample_type = PERF_SAMPLE_IP; 96 pe.wakeup_events = 1; 97 98 pe.disabled = 1; 99 pe.exclude_kernel = 1; 100 pe.exclude_hv = 1; 101 102 fd = sys_perf_event_open(&pe, 0, -1, -1, 103 perf_event_open_cloexec_flag()); 104 if (fd < 0) { 105 pr_debug("failed opening event %llx\n", pe.config); 106 return TEST_FAIL; 107 } 108 109 fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC); 110 fcntl(fd, F_SETSIG, SIGIO); 111 fcntl(fd, F_SETOWN, getpid()); 112 113 ioctl(fd, PERF_EVENT_IOC_RESET, 0); 114 ioctl(fd, PERF_EVENT_IOC_ENABLE, 0); 115 116 for (i = 0; i < EXECUTIONS; i++) 117 test_function(); 118 119 ioctl(fd, PERF_EVENT_IOC_DISABLE, 0); 120 121 count = bp_count(fd); 122 123 close(fd); 124 125 pr_debug("count %lld, overflow %d\n", 126 count, overflows); 127 128 if (count != EXECUTIONS) { 129 pr_debug("\tWrong number of executions %lld != %d\n", 130 count, EXECUTIONS); 131 fails++; 132 } 133 134 if (overflows != EXECUTIONS / THRESHOLD) { 135 pr_debug("\tWrong number of overflows %d != %d\n", 136 overflows, EXECUTIONS / THRESHOLD); 137 fails++; 138 } 139 140 return fails ? TEST_FAIL : TEST_OK; 141 } 142 143 DEFINE_SUITE("Breakpoint overflow sampling", bp_signal_overflow); 144