Commit b7896486 authored by Jiri Olsa's avatar Jiri Olsa Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add fill_link_info test for perf event 



Adding fill_link_info test for perf event and testing we
get its values back through the bpf_link_info interface.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Acked-by: default avatarSong Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240119110505.400573-7-jolsa@kernel.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent d7417970

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

+40 −0
Original line number Diff line number Diff line
@@ -109,6 +109,11 @@ static int verify_perf_link_info(int fd, enum bpf_perf_event_type type, long add 
			      strlen(UPROBE_FILE));

			ASSERT_EQ(err, 0, "cmp_file_name");

		break;

	case BPF_PERF_EVENT_EVENT:

		ASSERT_EQ(info.perf_event.event.type, PERF_TYPE_SOFTWARE, "event_type");

		ASSERT_EQ(info.perf_event.event.config, PERF_COUNT_SW_PAGE_FAULTS, "event_config");

		ASSERT_EQ(info.perf_event.event.cookie, PERF_EVENT_COOKIE, "event_cookie");

		break;

	default:

		err = -1;

		break;
@@ -189,6 +194,39 @@ static void test_tp_fill_link_info(struct test_fill_link_info *skel) 
	bpf_link__destroy(link);

}



static void test_event_fill_link_info(struct test_fill_link_info *skel)

{

	DECLARE_LIBBPF_OPTS(bpf_perf_event_opts, opts,

		.bpf_cookie = PERF_EVENT_COOKIE,

	);

	struct bpf_link *link;

	int link_fd, err, pfd;

	struct perf_event_attr attr = {

		.type = PERF_TYPE_SOFTWARE,

		.config = PERF_COUNT_SW_PAGE_FAULTS,

		.freq = 1,

		.sample_freq = 1,

		.size = sizeof(struct perf_event_attr),

	};



	pfd = syscall(__NR_perf_event_open, &attr, -1 /* pid */, 0 /* cpu 0 */,

		      -1 /* group id */, 0 /* flags */);

	if (!ASSERT_GE(pfd, 0, "perf_event_open"))

		return;



	link = bpf_program__attach_perf_event_opts(skel->progs.event_run, pfd, &opts);

	if (!ASSERT_OK_PTR(link, "attach_event"))

		goto error;



	link_fd = bpf_link__fd(link);

	err = verify_perf_link_info(link_fd, BPF_PERF_EVENT_EVENT, 0, 0, 0);

	ASSERT_OK(err, "verify_perf_link_info");

	bpf_link__destroy(link);



error:

	close(pfd);

}



static void test_uprobe_fill_link_info(struct test_fill_link_info *skel,

				       enum bpf_perf_event_type type)

{
@@ -549,6 +587,8 @@ void test_fill_link_info(void) 
		test_kprobe_fill_link_info(skel, BPF_PERF_EVENT_KPROBE, true);

	if (test__start_subtest("tracepoint_link_info"))

		test_tp_fill_link_info(skel);

	if (test__start_subtest("event_link_info"))

		test_event_fill_link_info(skel);



	uprobe_offset = get_uprobe_offset(&uprobe_func);

	if (test__start_subtest("uprobe_link_info"))

tools/testing/selftests/bpf/progs/test_fill_link_info.c

+6 −0
Original line number Diff line number Diff line
@@ -33,6 +33,12 @@ int BPF_PROG(tp_run) 
	return 0;

}



SEC("perf_event")

int event_run(void *ctx)

{

	return 0;

}



SEC("kprobe.multi")

int BPF_PROG(kmulti_run)

{