LXR linux/tools/perf/tests/bp_signal

   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 "../perf-sys.h"
  29#include "cloexec.h"
  30
  31static int overflows;
  32
  33static noinline int test_function(void)
  34{
  35        return time(NULL);
  36}
  37
  38static void sig_handler(int signum __maybe_unused,
  39                        siginfo_t *oh __maybe_unused,
  40                        void *uc __maybe_unused)
  41{
  42        overflows++;
  43}
  44
  45static long long bp_count(int fd)
  46{
  47        long long count;
  48        int ret;
  49
  50        ret = read(fd, &count, sizeof(long long));
  51        if (ret != sizeof(long long)) {
  52                pr_debug("failed to read: %d\n", ret);
  53                return TEST_FAIL;
  54        }
  55
  56        return count;
  57}
  58
  59#define EXECUTIONS 10000
  60#define THRESHOLD  100
  61
  62int test__bp_signal_overflow(struct test *test __maybe_unused, int subtest __maybe_unused)
  63{
  64        struct perf_event_attr pe;
  65        struct sigaction sa;
  66        long long count;
  67        int fd, i, fails = 0;
  68
  69        /* setup SIGIO signal handler */
  70        memset(&sa, 0, sizeof(struct sigaction));
  71        sa.sa_sigaction = (void *) sig_handler;
  72        sa.sa_flags = SA_SIGINFO;
  73
  74        if (sigaction(SIGIO, &sa, NULL) < 0) {
  75                pr_debug("failed setting up signal handler\n");
  76                return TEST_FAIL;
  77        }
  78
  79        memset(&pe, 0, sizeof(struct perf_event_attr));
  80        pe.type = PERF_TYPE_BREAKPOINT;
  81        pe.size = sizeof(struct perf_event_attr);
  82
  83        pe.config = 0;
  84        pe.bp_type = HW_BREAKPOINT_X;
  85        pe.bp_addr = (unsigned long) test_function;
  86        pe.bp_len = sizeof(long);
  87
  88        pe.sample_period = THRESHOLD;
  89        pe.sample_type = PERF_SAMPLE_IP;
  90        pe.wakeup_events = 1;
  91
  92        pe.disabled = 1;
  93        pe.exclude_kernel = 1;
  94        pe.exclude_hv = 1;
  95
  96        fd = sys_perf_event_open(&pe, 0, -1, -1,
  97                                 perf_event_open_cloexec_flag());
  98        if (fd < 0) {
  99                pr_debug("failed opening event %llx\n", pe.config);
 100                return TEST_FAIL;
 101        }
 102
 103        fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);
 104        fcntl(fd, F_SETSIG, SIGIO);
 105        fcntl(fd, F_SETOWN, getpid());
 106
 107        ioctl(fd, PERF_EVENT_IOC_RESET, 0);
 108        ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
 109
 110        for (i = 0; i < EXECUTIONS; i++)
 111                test_function();
 112
 113        ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
 114
 115        count = bp_count(fd);
 116
 117        close(fd);
 118
 119        pr_debug("count %lld, overflow %d\n",
 120                 count, overflows);
 121
 122        if (count != EXECUTIONS) {
 123                pr_debug("\tWrong number of executions %lld != %d\n",
 124                count, EXECUTIONS);
 125                fails++;
 126        }
 127
 128        if (overflows != EXECUTIONS / THRESHOLD) {
 129                pr_debug("\tWrong number of overflows %d != %d\n",
 130                overflows, EXECUTIONS / THRESHOLD);
 131                fails++;
 132        }
 133
 134        return fails ? TEST_FAIL : TEST_OK;
 135}
 136