[PATCH V2] perf test: Fix parse-events tests to skip parametrized events

[Athira Rajeev <atrajeev@linux.vnet.ibm.com>]

Testcase "Parsing of all PMU events from sysfs" parse events for
all PMUs, and not just cpu. In case of powerpc, the PowerVM
environment supports events from hv_24x7 and hv_gpci PMU which
is of example format like below:

- hv_24x7/CPM_ADJUNCT_INST,domain=?,core=?/
- hv_gpci/event,partition_id=?/

The value for "?" needs to be filled in depending on system
configuration. It is better to skip these parametrized events
in this test as it is done in:
'commit b50d691e50e6 ("perf test: Fix "all PMU test" to skip
parametrized events")' which handled a simialr instance with
"all PMU test".

Fix parse-events test to skip parametrized events since
it needs proper setup of the parameters.

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
---
Changelog:
v1 -> v2:
 Addressed review comments from Ian. Updated size of
 pmu event name variable and changed bool name which is
 used to skip the test.

 tools/perf/tests/parse-events.c | 38 +++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
index 658fb9599d95..1ecaeceb69f8 100644
--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -2514,9 +2514,14 @@ static int test__pmu_events(struct test_suite *test __maybe_unused, int subtest
 	while ((pmu = perf_pmus__scan(pmu)) != NULL) {
 		struct stat st;
 		char path[PATH_MAX];
+		char pmu_event[PATH_MAX];
+		char *buf = NULL;
+		FILE *file;
 		struct dirent *ent;
+		size_t len = 0;
 		DIR *dir;
 		int err;
+		int n;
 
 		snprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/events/",
 			sysfs__mountpoint(), pmu->name);
@@ -2538,11 +2543,44 @@ static int test__pmu_events(struct test_suite *test __maybe_unused, int subtest
 			struct evlist_test e = { .name = NULL, };
 			char name[2 * NAME_MAX + 1 + 12 + 3];
 			int test_ret;
+			bool is_event_parameterized = 0;
 
 			/* Names containing . are special and cannot be used directly */
 			if (strchr(ent->d_name, '.'))
 				continue;
 
+			/* exclude parametrized ones (name contains '?') */
+			n = snprintf(pmu_event, sizeof(pmu_event), "%s%s", path, ent->d_name);
+			if (n >= PATH_MAX) {
+				pr_err("pmu event name crossed PATH_MAX(%d) size\n", PATH_MAX);
+				continue;
+			}
+
+			file = fopen(pmu_event, "r");
+			if (!file) {
+				pr_debug("can't open pmu event file for '%s'\n", ent->d_name);
+				ret = combine_test_results(ret, TEST_FAIL);
+				continue;
+			}
+
+			if (getline(&buf, &len, file) < 0) {
+				pr_debug(" pmu event: %s is a null event\n", ent->d_name);
+				ret = combine_test_results(ret, TEST_FAIL);
+				continue;
+			}
+
+			if (strchr(buf, '?'))
+				is_event_parameterized = 1;
+
+			free(buf);
+			buf = NULL;
+			fclose(file);
+
+			if (is_event_parameterized == 1) {
+				pr_debug("skipping parametrized PMU event: %s which contains ?\n", pmu_event);
+				continue;
+			}
+
 			snprintf(name, sizeof(name), "%s/event=%s/u", pmu->name, ent->d_name);
 
 			e.name  = name;
-- 
2.31.1