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// SPDX-License-Identifier: GPL-2.0
/*
* Originally done by Vince Weaver <vincent.weaver@maine.edu> for
* perf_event_tests (git://github.com/deater/perf_event_tests)
*/
/*
* Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
* 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
*/
#define __SANE_USERSPACE_TYPES__
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <time.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/mman.h>
#include <linux/compiler.h>
#include <linux/hw_breakpoint.h>
#include "tests.h"
#include "debug.h"
#include "event.h"
#include "../perf-sys.h"
#include "cloexec.h"
static int overflows;
static noinline int test_function(void)
{
return time(NULL);
}
static void sig_handler(int signum __maybe_unused,
siginfo_t *oh __maybe_unused,
void *uc __maybe_unused)
{
overflows++;
}
static long long bp_count(int fd)
{
long long count;
int ret;
ret = read(fd, &count, sizeof(long long));
if (ret != sizeof(long long)) {
pr_debug("failed to read: %d\n", ret);
return TEST_FAIL;
}
return count;
}
#define EXECUTIONS 10000
#define THRESHOLD 100
static int test__bp_signal_overflow(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
{
struct perf_event_attr pe;
struct sigaction sa;
long long count;
int fd, i, fails = 0;
if (!BP_SIGNAL_IS_SUPPORTED) {
pr_debug("Test not supported on this architecture");
return TEST_SKIP;
}
/* setup SIGIO signal handler */
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_sigaction = (void *) sig_handler;
sa.sa_flags = SA_SIGINFO;
if (sigaction(SIGIO, &sa, NULL) < 0) {
pr_debug("failed setting up signal handler\n");
return TEST_FAIL;
}
memset(&pe, 0, sizeof(struct perf_event_attr));
pe.type = PERF_TYPE_BREAKPOINT;
pe.size = sizeof(struct perf_event_attr);
pe.config = 0;
pe.bp_type = HW_BREAKPOINT_X;
pe.bp_addr = (unsigned long) test_function;
pe.bp_len = sizeof(long);
pe.sample_period = THRESHOLD;
pe.sample_type = PERF_SAMPLE_IP;
pe.wakeup_events = 1;
pe.disabled = 1;
pe.exclude_kernel = 1;
pe.exclude_hv = 1;
fd = sys_perf_event_open(&pe, 0, -1, -1,
perf_event_open_cloexec_flag());
if (fd < 0) {
pr_debug("failed opening event %llx\n", pe.config);
return TEST_FAIL;
}
fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);
fcntl(fd, F_SETSIG, SIGIO);
fcntl(fd, F_SETOWN, getpid());
ioctl(fd, PERF_EVENT_IOC_RESET, 0);
ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
for (i = 0; i < EXECUTIONS; i++)
test_function();
ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
count = bp_count(fd);
close(fd);
pr_debug("count %lld, overflow %d\n",
count, overflows);
if (count != EXECUTIONS) {
pr_debug("\tWrong number of executions %lld != %d\n",
count, EXECUTIONS);
fails++;
}
if (overflows != EXECUTIONS / THRESHOLD) {
pr_debug("\tWrong number of overflows %d != %d\n",
overflows, EXECUTIONS / THRESHOLD);
fails++;
}
return fails ? TEST_FAIL : TEST_OK;
}
DEFINE_SUITE("Breakpoint overflow sampling", bp_signal_overflow);
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