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 
13 noinline int func_1(void)
14 {
15 	static int val = 1;
16 
17 	val += 1;
18 
19 	usleep(100);
20 	return val;
21 }
22 
23 noinline int func_2(void)
24 {
25 	return func_1();
26 }
27 
28 noinline int func_3(void)
29 {
30 	return func_2();
31 }
32 
33 noinline int func_4(void)
34 {
35 	return func_3();
36 }
37 
38 noinline int func_5(void)
39 {
40 	return func_4();
41 }
42 
43 noinline 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 
53 void 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 
114 cleanup:
115 	perf_event_stackmap__destroy(skel);
116 }
117