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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/* Copyright (c) 2019 Facebook */
   3#include <test_progs.h>
   4#include <linux/bpf.h>
   5#include "test_pe_preserve_elems.skel.h"
   6
   7static int duration;
   8
   9static void test_one_map(struct bpf_map *map, struct bpf_program *prog,
  10                         bool has_share_pe)
  11{
  12        int err, key = 0, pfd = -1, mfd = bpf_map__fd(map);
  13        DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts);
  14        struct perf_event_attr attr = {
  15                .size = sizeof(struct perf_event_attr),
  16                .type = PERF_TYPE_SOFTWARE,
  17                .config = PERF_COUNT_SW_CPU_CLOCK,
  18        };
  19
  20        pfd = syscall(__NR_perf_event_open, &attr, 0 /* pid */,
  21                      -1 /* cpu 0 */, -1 /* group id */, 0 /* flags */);
  22        if (CHECK(pfd < 0, "perf_event_open", "failed\n"))
  23                return;
  24
  25        err = bpf_map_update_elem(mfd, &key, &pfd, BPF_ANY);
  26        close(pfd);
  27        if (CHECK(err < 0, "bpf_map_update_elem", "failed\n"))
  28                return;
  29
  30        err = bpf_prog_test_run_opts(bpf_program__fd(prog), &opts);
  31        if (CHECK(err < 0, "bpf_prog_test_run_opts", "failed\n"))
  32                return;
  33        if (CHECK(opts.retval != 0, "bpf_perf_event_read_value",
  34                  "failed with %d\n", opts.retval))
  35                return;
  36
  37        /* closing mfd, prog still holds a reference on map */
  38        close(mfd);
  39
  40        err = bpf_prog_test_run_opts(bpf_program__fd(prog), &opts);
  41        if (CHECK(err < 0, "bpf_prog_test_run_opts", "failed\n"))
  42                return;
  43
  44        if (has_share_pe) {
  45                CHECK(opts.retval != 0, "bpf_perf_event_read_value",
  46                      "failed with %d\n", opts.retval);
  47        } else {
  48                CHECK(opts.retval != -ENOENT, "bpf_perf_event_read_value",
  49                      "should have failed with %d, but got %d\n", -ENOENT,
  50                      opts.retval);
  51        }
  52}
  53
  54void test_pe_preserve_elems(void)
  55{
  56        struct test_pe_preserve_elems *skel;
  57
  58        skel = test_pe_preserve_elems__open_and_load();
  59        if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
  60                return;
  61
  62        test_one_map(skel->maps.array_1, skel->progs.read_array_1, false);
  63        test_one_map(skel->maps.array_2, skel->progs.read_array_2, true);
  64
  65        test_pe_preserve_elems__destroy(skel);
  66}
  67