Re: [PATCH v3 12/46] perf test: Test more sysfs events

[Ravi Bangoria <ravi.bangoria@amd.com>]

> @@ -2225,74 +2226,82 @@ static int test_pmu(void)
>  
>  static int test__pmu_events(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
>  {
> -	struct stat st;
> -	char path[PATH_MAX];
> -	struct dirent *ent;
> -	DIR *dir;
> -	int ret;
> +	struct perf_pmu *pmu;
> +	int ret = TEST_OK;
>  
> -	if (!test_pmu())
> -		return TEST_SKIP;
> +	perf_pmus__for_each_pmu(pmu) {

'pmus' list might be empty and, if so, we need to fill it first with:

        if (list_empty(&pmus))
                perf_pmu__scan(NULL);

before iterating over it. Other option is to add this code to
perf_pmus__for_each_pmu() macro itself.

With that, the test fails for me:

$ sudo ./perf test 6
  6: Parse event definition strings                                  :
  6.1: Test event parsing                                            : Ok
  6.2: Test parsing of "hybrid" CPU events                           : Skip (not hybrid)
  6.3: Parsing of all PMU events from sysfs                          : FAILED!

> +		struct stat st;
> +		char path[PATH_MAX];
> +		struct dirent *ent;
> +		DIR *dir;
> +		int err;
>  
> -	snprintf(path, PATH_MAX, "%s/bus/event_source/devices/cpu/events/",
> -		 sysfs__mountpoint());
> +		snprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/events/",
> +			sysfs__mountpoint(), pmu->name);
>  
> -	ret = stat(path, &st);
> -	if (ret) {
> -		pr_debug("omitting PMU cpu events tests: %s\n", path);
> -		return TEST_OK;
> -	}
> +		err = stat(path, &st);
> +		if (err) {
> +			pr_debug("skipping PMU %s events tests: %s\n", pmu->name, path);
> +			ret = combine_test_results(ret, TEST_SKIP);

combine_test_results(ret, TEST_OK); probably? Since many pmus don't expose
events via sysfs.