[PATCH v1 1/2] perf pmus: Create placholder regardless of scanning core_only

[PATCH v1 1/2] perf pmus: Create placholder regardless of scanning core_only

[Ian Rogers]

If scanning all PMUs the placeholder is still necessary if no core PMU
is found. This situation occurs in perf test's parse-events test,
when uncore events appear before core.

Fixes: 628eaa4e877a ("perf pmus: Add placeholder core PMU")
Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/pmus.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
index 3cd9de42139e..c58ba9fb6a36 100644
--- a/tools/perf/util/pmus.c
+++ b/tools/perf/util/pmus.c
@@ -152,16 +152,14 @@ static void pmu_read_sysfs(bool core_only)
 	}
 
 	closedir(dir);
-	if (core_only) {
-		if (!list_empty(&core_pmus))
-			read_sysfs_core_pmus = true;
-		else {
-			if (perf_pmu__create_placeholder_core_pmu(&core_pmus))
-				read_sysfs_core_pmus = true;
-		}
-	} else {
+	if (list_empty(&core_pmus)) {
+		if (!perf_pmu__create_placeholder_core_pmu(&core_pmus))
+			pr_err("Failure to set up any core PMUs\n");
+	}
+	if (!list_empty(&core_pmus)) {
 		read_sysfs_core_pmus = true;
-		read_sysfs_all_pmus = true;
+		if (!core_only)
+			read_sysfs_all_pmus = true;
 	}
 }
 
-- 
2.41.0.390.g38632f3daf-goog

[PATCH v1 2/2] perf test parse-events: Test complex name has required event format

[Ian Rogers]

test__checkevent_complex_name will use an "event" format which if not
present, such as with a placeholder PMU, will cause test
failures. Skip the test in this case to avoid failures in restricted
environments.

Add perf_pmu__has_format utility as a general PMU utility.

Fixes: 628eaa4e877a ("perf pmus: Add placeholder core PMU")
Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/tests/parse-events.c | 12 +++++++++++-
 tools/perf/util/pmu.c           | 11 +++++++++++
 tools/perf/util/pmu.h           |  1 +
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
index b2f82847e4c3..658fb9599d95 100644
--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -1631,6 +1631,16 @@ static bool test__pmu_cpu_valid(void)
 	return !!perf_pmus__find("cpu");
 }
 
+static bool test__pmu_cpu_event_valid(void)
+{
+	struct perf_pmu *pmu = perf_pmus__find("cpu");
+
+	if (!pmu)
+		return false;
+
+	return perf_pmu__has_format(pmu, "event");
+}
+
 static bool test__intel_pt_valid(void)
 {
 	return !!perf_pmus__find("intel_pt");
@@ -2179,7 +2189,7 @@ static const struct evlist_test test__events_pmu[] = {
 	},
 	{
 		.name  = "cpu/name='COMPLEX_CYCLES_NAME:orig=cycles,desc=chip-clock-ticks',period=0x1,event=0x2/ukp",
-		.valid = test__pmu_cpu_valid,
+		.valid = test__pmu_cpu_event_valid,
 		.check = test__checkevent_complex_name,
 		/* 3 */
 	},
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 7f984a7f16ca..28380e7aa8d0 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -1440,6 +1440,17 @@ void perf_pmu__del_formats(struct list_head *formats)
 	}
 }
 
+bool perf_pmu__has_format(const struct perf_pmu *pmu, const char *name)
+{
+	struct perf_pmu_format *format;
+
+	list_for_each_entry(format, &pmu->format, list) {
+		if (!strcmp(format->name, name))
+			return true;
+	}
+	return false;
+}
+
 bool is_pmu_core(const char *name)
 {
 	return !strcmp(name, "cpu") || !strcmp(name, "cpum_cf") || is_sysfs_pmu_core(name);
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 203b92860e3c..6b414cecbad2 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -234,6 +234,7 @@ int perf_pmu__new_format(struct list_head *list, char *name,
 void perf_pmu__set_format(unsigned long *bits, long from, long to);
 int perf_pmu__format_parse(int dirfd, struct list_head *head);
 void perf_pmu__del_formats(struct list_head *formats);
+bool perf_pmu__has_format(const struct perf_pmu *pmu, const char *name);
 
 bool is_pmu_core(const char *name);
 bool perf_pmu__supports_legacy_cache(const struct perf_pmu *pmu);
-- 
2.41.0.390.g38632f3daf-goog