tools/perf/tests/bp_signal_overflow.c

   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 }