// 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 "parse-events.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 = default_breakpoint_len();

        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);