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