LXR linux/tools/testing/selftests/bpf/prog_tests/get_stackid_cannot

   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_perf_event(skel->progs.oncpu);
  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        close(pmu_fd);
  69
  70        /* add exclude_callchain_kernel, attach should fail */
  71        attr.exclude_callchain_kernel = 1;
  72
  73        pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
  74                         0 /* cpu 0 */, -1 /* group id */,
  75                         0 /* flags */);
  76
  77        if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
  78                  pmu_fd, errno))
  79                goto cleanup;
  80
  81        skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
  82                                                           pmu_fd);
  83        ASSERT_ERR_PTR(skel->links.oncpu, "attach_perf_event_exclude_callchain_kernel");
  84        close(pmu_fd);
  85
  86cleanup:
  87        test_stacktrace_build_id__destroy(skel);
  88}
  89