tools/testing/selftests/bpf/prog_tests/get_stackid_cannot_attach.c

   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
   6 void 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
  87 cleanup:
  88         test_stacktrace_build_id__destroy(skel);
  89 }