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
7 static int duration;
8
9 static 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
54 void 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
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