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 "perf.h"
  28#include "cloexec.h"
  29
  30static int overflows;
  31
  32static noinline int test_function(void)
  33{
  34        return time(NULL);
  35}
  36
  37static void sig_handler(int signum __maybe_unused,
  38                        siginfo_t *oh __maybe_unused,
  39                        void *uc __maybe_unused)
  40{
  41        overflows++;
  42}
  43
  44static 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
  61int test__bp_signal_overflow(struct test *test __maybe_unused, int subtest __maybe_unused)
  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