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}
117