1// SPDX-License-Identifier: GPL-2.0
  2// Copyright (c) 2020 Facebook
  3#define _GNU_SOURCE
  4#include <pthread.h>
  5#include <sched.h>
  6#include <test_progs.h>
  7#include "perf_event_stackmap.skel.h"
  8
  9#ifndef noinline
 10#define noinline __attribute__((noinline))
 11#endif
 12
 13noinline int func_1(void)
 14{
 15	static int val = 1;
 16
 17	val += 1;
 18
 19	usleep(100);
 20	return val;
 21}
 22
 23noinline int func_2(void)
 24{
 25	return func_1();
 26}
 27
 28noinline int func_3(void)
 29{
 30	return func_2();
 31}
 32
 33noinline int func_4(void)
 34{
 35	return func_3();
 36}
 37
 38noinline int func_5(void)
 39{
 40	return func_4();
 41}
 42
 43noinline int func_6(void)
 44{
 45	int i, val = 1;
 46
 47	for (i = 0; i < 100; i++)
 48		val += func_5();
 49
 50	return val;
 51}
 52
 53void test_perf_event_stackmap(void)
 54{
 55	struct perf_event_attr attr = {
 56		/* .type = PERF_TYPE_SOFTWARE, */
 57		.type = PERF_TYPE_HARDWARE,
 58		.config = PERF_COUNT_HW_CPU_CYCLES,
 59		.precise_ip = 2,
 60		.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_BRANCH_STACK |
 61			PERF_SAMPLE_CALLCHAIN,
 62		.branch_sample_type = PERF_SAMPLE_BRANCH_USER |
 63			PERF_SAMPLE_BRANCH_NO_FLAGS |
 64			PERF_SAMPLE_BRANCH_NO_CYCLES |
 65			PERF_SAMPLE_BRANCH_CALL_STACK,
 66		.freq = 1,
 67		.sample_freq = read_perf_max_sample_freq(),
 68		.size = sizeof(struct perf_event_attr),
 69	};
 70	struct perf_event_stackmap *skel;
 71	__u32 duration = 0;
 72	cpu_set_t cpu_set;
 73	int pmu_fd, err;
 74
 75	skel = perf_event_stackmap__open();
 76
 77	if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
 78		return;
 79
 80	err = perf_event_stackmap__load(skel);
 81	if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err))
 82		goto cleanup;
 83
 84	CPU_ZERO(&cpu_set);
 85	CPU_SET(0, &cpu_set);
 86	err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), &cpu_set);
 87	if (CHECK(err, "set_affinity", "err %d, errno %d\n", err, errno))
 88		goto cleanup;
 89
 90	pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
 91			 0 /* cpu 0 */, -1 /* group id */,
 92			 0 /* flags */);
 93	if (pmu_fd < 0) {
 94		printf("%s:SKIP:cpu doesn't support the event\n", __func__);
 95		test__skip();
 96		goto cleanup;
 97	}
 98
 99	skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
100							   pmu_fd);
101	if (!ASSERT_OK_PTR(skel->links.oncpu, "attach_perf_event")) {
102		close(pmu_fd);
103		goto cleanup;
104	}
105
106	/* create kernel and user stack traces for testing */
107	func_6();
108
109	CHECK(skel->data->stackid_kernel != 2, "get_stackid_kernel", "failed\n");
110	CHECK(skel->data->stackid_user != 2, "get_stackid_user", "failed\n");
111	CHECK(skel->data->stack_kernel != 2, "get_stack_kernel", "failed\n");
112	CHECK(skel->data->stack_user != 2, "get_stack_user", "failed\n");
113
114cleanup:
115	perf_event_stackmap__destroy(skel);
116}