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selftests/bpf: Add fill_link_info test for perf event

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

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240119110505.400573-7-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa 2024-01-19 12:05:03 +01:00 committed by Alexei Starovoitov
parent d741797084
commit b789648668
2 changed files with 46 additions and 0 deletions
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40
tools/testing/selftests/bpf/prog_tests/fill_link_info.c
View File

@ -109,6 +109,11 @@ again:
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"))

6
tools/testing/selftests/bpf/progs/test_fill_link_info.c
View File

@ -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)
{