perf test: Use skip in openat syscall

Failures to open the tracepoint cause this test to fail, however,
typically such failures are permission related. Lower the failure to
just skipping the test in those cases and add a skip reason.

Committer testing:

Before:

  $ perf test "openat syscall"
    2: Detect openat syscall event                        : FAILED!
    3: Detect openat syscall event on all cpus            : FAILED!
  $

After:

  $ perf test "openat syscall"
    2: Detect openat syscall event                        : Skip (permissions)
    3: Detect openat syscall event on all cpus            : Skip (permissions)
  $

Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Carsten Haitzler <carsten.haitzler@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Riccardo Mancini <rickyman7@gmail.com>
Cc: Sohaib Mohamed <sohaib.amhmd@gmail.com>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20220518042027.836799-4-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/openat-syscall-all-cpus.c

@@ -22,7 +22,7 @@
 static int test__openat_syscall_event_on_all_cpus(struct test_suite *test __maybe_unused,
 						  int subtest __maybe_unused)
 {
-	int err = -1, fd, idx;
+	int err = TEST_FAIL, fd, idx;
 	struct perf_cpu cpu;
 	struct perf_cpu_map *cpus;
 	struct evsel *evsel;
@@ -49,6 +49,7 @@ static int test__openat_syscall_event_on_all_cpus(struct test_suite *test __mayb
 	if (IS_ERR(evsel)) {
 		tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
 		pr_debug("%s\n", errbuf);
+		err = TEST_SKIP;
 		goto out_cpu_map_delete;
 	}
 
@@ -56,6 +57,7 @@ static int test__openat_syscall_event_on_all_cpus(struct test_suite *test __mayb
 		pr_debug("failed to open counter: %s, "
 			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
 			 str_error_r(errno, sbuf, sizeof(sbuf)));
+		err = TEST_SKIP;
 		goto out_evsel_delete;
 	}
 
@@ -88,7 +90,7 @@ static int test__openat_syscall_event_on_all_cpus(struct test_suite *test __mayb
 
 	evsel->core.cpus = perf_cpu_map__get(cpus);
 
-	err = 0;
+	err = TEST_OK;
 
 	perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
 		unsigned int expected;
@@ -98,7 +100,7 @@ static int test__openat_syscall_event_on_all_cpus(struct test_suite *test __mayb
 
 		if (evsel__read_on_cpu(evsel, idx, 0) < 0) {
 			pr_debug("evsel__read_on_cpu\n");
-			err = -1;
+			err = TEST_FAIL;
 			break;
 		}
 
@@ -106,7 +108,7 @@ static int test__openat_syscall_event_on_all_cpus(struct test_suite *test __mayb
 		if (perf_counts(evsel->counts, idx, 0)->val != expected) {
 			pr_debug("evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
 				 expected, cpu.cpu, perf_counts(evsel->counts, idx, 0)->val);
-			err = -1;
+			err = TEST_FAIL;
 		}
 	}
 
@@ -122,4 +124,15 @@ out_thread_map_delete:
 	return err;
 }
 
-DEFINE_SUITE("Detect openat syscall event on all cpus", openat_syscall_event_on_all_cpus);
+
+static struct test_case tests__openat_syscall_event_on_all_cpus[] = {
+	TEST_CASE_REASON("Detect openat syscall event on all cpus",
+			 openat_syscall_event_on_all_cpus,
+			 "permissions"),
+	{	.name = NULL, }
+};
+
+struct test_suite suite__openat_syscall_event_on_all_cpus = {
+	.desc = "Detect openat syscall event on all cpus",
+	.test_cases = tests__openat_syscall_event_on_all_cpus,
+};

tools/perf/tests/openat-syscall.c

@@ -16,7 +16,7 @@
 static int test__openat_syscall_event(struct test_suite *test __maybe_unused,
 				      int subtest __maybe_unused)
 {
-	int err = -1, fd;
+	int err = TEST_FAIL, fd;
 	struct evsel *evsel;
 	unsigned int nr_openat_calls = 111, i;
 	struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
@@ -25,13 +25,14 @@ static int test__openat_syscall_event(struct test_suite *test __maybe_unused,
 
 	if (threads == NULL) {
 		pr_debug("thread_map__new\n");
-		return -1;
+		return TEST_FAIL;
 	}
 
 	evsel = evsel__newtp("syscalls", "sys_enter_openat");
 	if (IS_ERR(evsel)) {
 		tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
 		pr_debug("%s\n", errbuf);
+		err = TEST_SKIP;
 		goto out_thread_map_delete;
 	}
 
@@ -39,6 +40,7 @@ static int test__openat_syscall_event(struct test_suite *test __maybe_unused,
 		pr_debug("failed to open counter: %s, "
 			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
 			 str_error_r(errno, sbuf, sizeof(sbuf)));
+		err = TEST_SKIP;
 		goto out_evsel_delete;
 	}
 
@@ -58,7 +60,7 @@ static int test__openat_syscall_event(struct test_suite *test __maybe_unused,
 		goto out_close_fd;
 	}
 
-	err = 0;
+	err = TEST_OK;
 out_close_fd:
 	perf_evsel__close_fd(&evsel->core);
 out_evsel_delete:
@@ -68,4 +70,14 @@ out_thread_map_delete:
 	return err;
 }
 
-DEFINE_SUITE("Detect openat syscall event", openat_syscall_event);
+static struct test_case tests__openat_syscall_event[] = {
+	TEST_CASE_REASON("Detect openat syscall event",
+			 openat_syscall_event,
+			 "permissions"),
+	{	.name = NULL, }
+};
+
+struct test_suite suite__openat_syscall_event = {
+	.desc = "Detect openat syscall event",
+	.test_cases = tests__openat_syscall_event,
+};