projects/linux·blob master · refs

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1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2020 Facebook
3#include <test_progs.h>
4#include "test_stacktrace_build_id.skel.h"
5
6void test_get_stackid_cannot_attach(void)
7{
8 struct perf_event_attr attr = {
9 /* .type = PERF_TYPE_SOFTWARE, */
10 .type = PERF_TYPE_HARDWARE,
11 .config = PERF_COUNT_HW_CPU_CYCLES,
12 .precise_ip = 1,
13 .sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_BRANCH_STACK,
14 .branch_sample_type = PERF_SAMPLE_BRANCH_USER |
15 PERF_SAMPLE_BRANCH_NO_FLAGS |
16 PERF_SAMPLE_BRANCH_NO_CYCLES |
17 PERF_SAMPLE_BRANCH_CALL_STACK,
18 .sample_period = 5000,
19 .size = sizeof(struct perf_event_attr),
20 };
21 struct test_stacktrace_build_id *skel;
22 __u32 duration = 0;
23 int pmu_fd, err;
24
25 skel = test_stacktrace_build_id__open();
26 if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
27 return;
28
29 /* override program type */
30 bpf_program__set_type(skel->progs.oncpu, BPF_PROG_TYPE_PERF_EVENT);
31
32 err = test_stacktrace_build_id__load(skel);
33 if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err))
34 goto cleanup;
35
36 pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
37 0 /* cpu 0 */, -1 /* group id */,
38 0 /* flags */);
39 if (pmu_fd < 0 && (errno == ENOENT || errno == EOPNOTSUPP)) {
40 printf("%s:SKIP:cannot open PERF_COUNT_HW_CPU_CYCLES with precise_ip > 0\n",
41 __func__);
42 test__skip();
43 goto cleanup;
44 }
45 if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
46 pmu_fd, errno))
47 goto cleanup;
48
49 skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
50 pmu_fd);
51 ASSERT_ERR_PTR(skel->links.oncpu, "attach_perf_event_no_callchain");
52 close(pmu_fd);
53
54 /* add PERF_SAMPLE_CALLCHAIN, attach should succeed */
55 attr.sample_type |= PERF_SAMPLE_CALLCHAIN;
56
57 pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
58 0 /* cpu 0 */, -1 /* group id */,
59 0 /* flags */);
60
61 if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
62 pmu_fd, errno))
63 goto cleanup;
64
65 skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
66 pmu_fd);
67 ASSERT_OK_PTR(skel->links.oncpu, "attach_perf_event_callchain");
68 bpf_link__destroy(skel->links.oncpu);
69 close(pmu_fd);
70
71 /* add exclude_callchain_kernel, attach should fail */
72 attr.exclude_callchain_kernel = 1;
73
74 pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
75 0 /* cpu 0 */, -1 /* group id */,
76 0 /* flags */);
77
78 if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
79 pmu_fd, errno))
80 goto cleanup;
81
82 skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
83 pmu_fd);
84 ASSERT_ERR_PTR(skel->links.oncpu, "attach_perf_event_exclude_callchain_kernel");
85 close(pmu_fd);
86
87cleanup:
88 test_stacktrace_build_id__destroy(skel);
89}