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
 29static int overflows;
 30
 31__attribute__ ((noinline))
 32static 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(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}