linux-kernel - [PATCH 1/2] perf test: Fix event parsing test on Arm

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Message-Id: <20230704143628.1177124-1-james.clark@arm.com>
Date:   Tue,  4 Jul 2023 15:36:27 +0100
From:   James Clark <james.clark@....com>
To:     linux-perf-users@...r.kernel.org, irogers@...gle.com
Cc:     James Clark <james.clark@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] perf test: Fix event parsing test on Arm

The test looks for a PMU from sysfs with type = PERF_TYPE_RAW when
opening a raw event. Arm doesn't have a real raw PMU, only core PMUs
with unique types other than raw.

Instead of looking for a matching PMU, just test that the event type
was parsed as raw and skip the PMU search on Arm. The raw event type
test should also apply to all platforms so add it outside of the ifdef.

Fixes: aefde50a446b ("perf test: Fix parse-events tests for >1 core PMU")
Signed-off-by: James Clark <james.clark@....com>
---
 tools/perf/tests/parse-events.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
index 133218e51ab4..21f79aa31233 100644
--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -108,10 +108,21 @@ static int test__checkevent_raw(struct evlist *evlist)
 	TEST_ASSERT_VAL("wrong number of entries", 0 != evlist->core.nr_entries);
 
 	perf_evlist__for_each_evsel(&evlist->core, evsel) {
-		struct perf_pmu *pmu = NULL;
+		struct perf_pmu *pmu __maybe_unused = NULL;
 		bool type_matched = false;
 
 		TEST_ASSERT_VAL("wrong config", test_perf_config(evsel, 0x1a));
+		TEST_ASSERT_VAL("event not parsed as raw type",
+				evsel->attr.type == PERF_TYPE_RAW);
+#if defined(__aarch64__)
+		/*
+		 * Arm doesn't have a real raw type PMU in sysfs, so raw events
+		 * would never match any PMU. However, RAW events on Arm will
+		 * always successfully open on the first available core PMU
+		 * so no need to test for a matching type here.
+		 */
+		type_matched = raw_type_match = true;
+#else
 		while ((pmu = perf_pmus__scan(pmu)) != NULL) {
 			if (pmu->type == evsel->attr.type) {
 				TEST_ASSERT_VAL("PMU type expected once", !type_matched);
@@ -120,6 +131,7 @@ static int test__checkevent_raw(struct evlist *evlist)
 					raw_type_match = true;
 			}
 		}
+#endif
 		TEST_ASSERT_VAL("No PMU found for type", type_matched);
 	}
 	TEST_ASSERT_VAL("Raw PMU not matched", raw_type_match);
-- 
2.34.1