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 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 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" 27 #include "cloexec.h" 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 95 fd = sys_perf_event_open(&pe, 0, -1, -1, 96 perf_event_open_cloexec_flag()); 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 } 135