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 28 static int overflows; 29 30 __attribute__ ((noinline)) 31 static int test_function(void) 32 { 33 return time(NULL); 34 } 35 36 static void sig_handler(int signum __maybe_unused, 37 siginfo_t *oh __maybe_unused, 38 void *uc __maybe_unused) 39 { 40 overflows++; 41 } 42 43 static long long bp_count(int fd) 44 { 45 long long count; 46 int ret; 47 48 ret = read(fd, &count, sizeof(long long)); 49 if (ret != sizeof(long long)) { 50 pr_debug("failed to read: %d\n", ret); 51 return TEST_FAIL; 52 } 53 54 return count; 55 } 56 57 #define EXECUTIONS 10000 58 #define THRESHOLD 100 59 60 int test__bp_signal_overflow(void) 61 { 62 struct perf_event_attr pe; 63 struct sigaction sa; 64 long long count; 65 int fd, i, fails = 0; 66 67 /* setup SIGIO signal handler */ 68 memset(&sa, 0, sizeof(struct sigaction)); 69 sa.sa_sigaction = (void *) sig_handler; 70 sa.sa_flags = SA_SIGINFO; 71 72 if (sigaction(SIGIO, &sa, NULL) < 0) { 73 pr_debug("failed setting up signal handler\n"); 74 return TEST_FAIL; 75 } 76 77 memset(&pe, 0, sizeof(struct perf_event_attr)); 78 pe.type = PERF_TYPE_BREAKPOINT; 79 pe.size = sizeof(struct perf_event_attr); 80 81 pe.config = 0; 82 pe.bp_type = HW_BREAKPOINT_X; 83 pe.bp_addr = (unsigned long) test_function; 84 pe.bp_len = sizeof(long); 85 86 pe.sample_period = THRESHOLD; 87 pe.sample_type = PERF_SAMPLE_IP; 88 pe.wakeup_events = 1; 89 90 pe.disabled = 1; 91 pe.exclude_kernel = 1; 92 pe.exclude_hv = 1; 93 94 fd = sys_perf_event_open(&pe, 0, -1, -1, 0); 95 if (fd < 0) { 96 pr_debug("failed opening event %llx\n", pe.config); 97 return TEST_FAIL; 98 } 99 100 fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC); 101 fcntl(fd, F_SETSIG, SIGIO); 102 fcntl(fd, F_SETOWN, getpid()); 103 104 ioctl(fd, PERF_EVENT_IOC_RESET, 0); 105 ioctl(fd, PERF_EVENT_IOC_ENABLE, 0); 106 107 for (i = 0; i < EXECUTIONS; i++) 108 test_function(); 109 110 ioctl(fd, PERF_EVENT_IOC_DISABLE, 0); 111 112 count = bp_count(fd); 113 114 close(fd); 115 116 pr_debug("count %lld, overflow %d\n", 117 count, overflows); 118 119 if (count != EXECUTIONS) { 120 pr_debug("\tWrong number of executions %lld != %d\n", 121 count, EXECUTIONS); 122 fails++; 123 } 124 125 if (overflows != EXECUTIONS / THRESHOLD) { 126 pr_debug("\tWrong number of overflows %d != %d\n", 127 overflows, EXECUTIONS / THRESHOLD); 128 fails++; 129 } 130 131 return fails ? TEST_FAIL : TEST_OK; 132 } 133