// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2020 Facebook
#define _GNU_SOURCE
#include <pthread.h>
#include <sched.h>
#include <test_progs.h>
#include "perf_event_stackmap.skel.h"

#ifndef noinline
#define noinline __attribute__((noinline))
#endif

noinline int func_1(void)
{
        static int val = 1;

        val += 1;

        usleep(100);
        return val;
}

noinline int func_2(void)
{
        return func_1();
}

noinline int func_3(void)
{
        return func_2();
}

noinline int func_4(void)
{
        return func_3();
}

noinline int func_5(void)
{
        return func_4();
}

noinline int func_6(void)
{
        int i, val = 1;

        for (i = 0; i < 100; i++)
                val += func_5();

        return val;
}

void test_perf_event_stackmap(void)
{
        struct perf_event_attr attr = {
                /* .type = PERF_TYPE_SOFTWARE, */
                .type = PERF_TYPE_HARDWARE,
                .config = PERF_COUNT_HW_CPU_CYCLES,
                .precise_ip = 2,
                .sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_BRANCH_STACK |
                        PERF_SAMPLE_CALLCHAIN,
                .branch_sample_type = PERF_SAMPLE_BRANCH_USER |
                        PERF_SAMPLE_BRANCH_NO_FLAGS |
                        PERF_SAMPLE_BRANCH_NO_CYCLES |
                        PERF_SAMPLE_BRANCH_CALL_STACK,
                .freq = 1,
                .sample_freq = read_perf_max_sample_freq(),
                .size = sizeof(struct perf_event_attr),
        };
        struct perf_event_stackmap *skel;
        __u32 duration = 0;
        cpu_set_t cpu_set;
        int pmu_fd, err;

        skel = perf_event_stackmap__open();

        if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
                return;

        err = perf_event_stackmap__load(skel);
        if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err))
                goto cleanup;

        CPU_ZERO(&cpu_set);
        CPU_SET(0, &cpu_set);
        err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), &cpu_set);
        if (CHECK(err, "set_affinity", "err %d, errno %d\n", err, errno))
                goto cleanup;

        pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
                         0 /* cpu 0 */, -1 /* group id */,
                         0 /* flags */);
        if (pmu_fd < 0) {
                printf("%s:SKIP:cpu doesn't support the event\n", __func__);
                test__skip();
                goto cleanup;
        }

        skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
                                                           pmu_fd);
        if (!ASSERT_OK_PTR(skel->links.oncpu, "attach_perf_event")) {
                close(pmu_fd);
                goto cleanup;
        }

        /* create kernel and user stack traces for testing */
        func_6();

        CHECK(skel->data->stackid_kernel != 2, "get_stackid_kernel", "failed\n");
        CHECK(skel->data->stackid_user != 2, "get_stackid_user", "failed\n");
        CHECK(skel->data->stack_kernel != 2, "get_stack_kernel", "failed\n");
        CHECK(skel->data->stack_user != 2, "get_stack_user", "failed\n");

cleanup:
        perf_event_stackmap__destroy(skel);
}