perf pmus: Remove perf_pmus__has_hybrid

perf_pmus__has_hybrid was used to detect when there was >1 core PMU,
this can be achieved with perf_pmus__num_core_pmus that doesn't depend
upon is_pmu_hybrid and PMU name comparisons. When modifying the
function calls take the opportunity to improve comments,
enable/simplify tests that were previously failing for hybrid but now
pass and to simplify generic code.

Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ali Saidi <alisaidi@amazon.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kang Minchul <tegongkang@gmail.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Ming Wang <wangming01@loongson.cn>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230527072210.2900565-34-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

9 files changed, 13 insertions, 46 deletions

diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
index 729142ec9a9ad..81cfc85f46682 100644
--- a/tools/perf/util/cputopo.c
+++ b/tools/perf/util/cputopo.c
@@ -472,15 +472,9 @@ struct hybrid_topology *hybrid_topology__new(void)
 {
 	struct perf_pmu *pmu = NULL;
 	struct hybrid_topology *tp = NULL;
-	u32 nr = 0, i = 0;
+	int nr = perf_pmus__num_core_pmus(), i = 0;
 
-	if (!perf_pmus__has_hybrid())
-		return NULL;
-
-	while ((pmu = perf_pmus__scan_core(pmu)) != NULL)
-		nr++;
-
-	if (nr == 0)
+	if (nr <= 1)
 		return NULL;
 
 	tp = zalloc(sizeof(*tp) + sizeof(tp->nodes[0]) * nr);
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index b4237fc713d53..ec2ce39d66d8f 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -3140,7 +3140,7 @@ void evsel__zero_per_pkg(struct evsel *evsel)
  */
 bool evsel__is_hybrid(const struct evsel *evsel)
 {
-	if (!perf_pmus__has_hybrid())
+	if (perf_pmus__num_core_pmus() == 1)
 		return false;
 
 	return evsel->core.is_pmu_core;
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 2dde3ca20de53..0c69109c0a3b7 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1605,7 +1605,7 @@ static int write_pmu_caps(struct feat_fd *ff,
 	 * Write hybrid pmu caps first to maintain compatibility with
 	 * older perf tool.
 	 */
-	if (perf_pmus__has_hybrid()) {
+	if (perf_pmus__num_core_pmus() > 1) {
 		pmu = NULL;
 		while ((pmu = perf_pmus__scan_core(pmu))) {
 			ret = __write_pmu_caps(ff, pmu, true);
diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index c5596230a3082..be15aadb6b145 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -121,6 +121,7 @@ int perf_mem_events__init(void)
 	for (j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
 		struct perf_mem_event *e = perf_mem_events__ptr(j);
 		char sysfs_name[100];
+		struct perf_pmu *pmu = NULL;
 
 		/*
 		 * If the event entry isn't valid, skip initialization
@@ -129,18 +130,9 @@ int perf_mem_events__init(void)
 		if (!e->tag)
 			continue;
 
-		if (!perf_pmus__has_hybrid()) {
-			scnprintf(sysfs_name, sizeof(sysfs_name),
-				  e->sysfs_name, "cpu");
-			e->supported = perf_mem_event__supported(mnt, sysfs_name);
-		} else {
-			struct perf_pmu *pmu = NULL;
-
-			while ((pmu = perf_pmus__scan_core(pmu)) != NULL) {
-				scnprintf(sysfs_name, sizeof(sysfs_name),
-					  e->sysfs_name, pmu->name);
-				e->supported |= perf_mem_event__supported(mnt, sysfs_name);
-			}
+		while ((pmu = perf_pmus__scan_core(pmu)) != NULL) {
+			scnprintf(sysfs_name, sizeof(sysfs_name), e->sysfs_name, pmu->name);
+			e->supported |= perf_mem_event__supported(mnt, sysfs_name);
 		}
 
 		if (e->supported)
@@ -196,7 +188,7 @@ int perf_mem_events__record_args(const char **rec_argv, int *argv_nr,
 		if (!e->record)
 			continue;
 
-		if (!perf_pmus__has_hybrid()) {
+		if (perf_pmus__num_core_pmus() == 1) {
 			if (!e->supported) {
 				pr_err("failed: event '%s' not supported\n",
 				       perf_mem_events__name(j, NULL));
diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 092ed6386a39e..70ef2e23a7106 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -274,7 +274,7 @@ static int setup_metric_events(const char *pmu, struct hashmap *ids,
 	const char *metric_id;
 	struct evsel *ev;
 	size_t ids_size, matched_events, i;
-	bool all_pmus = !strcmp(pmu, "all") || !perf_pmus__has_hybrid() || !is_pmu_hybrid(pmu);
+	bool all_pmus = !strcmp(pmu, "all") || perf_pmus__num_core_pmus() == 1 || !is_pmu_core(pmu);
 
 	*out_metric_events = NULL;
 	ids_size = hashmap__size(ids);
diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
index bf927aed162e8..53f11f6ce8788 100644
--- a/tools/perf/util/pmus.c
+++ b/tools/perf/util/pmus.c
@@ -464,24 +464,6 @@ bool perf_pmus__have_event(const char *pname, const char *name)
 	return pmu && perf_pmu__have_event(pmu, name);
 }
 
-bool perf_pmus__has_hybrid(void)
-{
-	static bool hybrid_scanned, has_hybrid;
-
-	if (!hybrid_scanned) {
-		struct perf_pmu *pmu = NULL;
-
-		while ((pmu = perf_pmus__scan_core(pmu)) != NULL) {
-			if (is_pmu_hybrid(pmu->name)) {
-				has_hybrid = true;
-				break;
-			}
-		}
-		hybrid_scanned = true;
-	}
-	return has_hybrid;
-}
-
 int perf_pmus__num_core_pmus(void)
 {
 	static int count;
diff --git a/tools/perf/util/pmus.h b/tools/perf/util/pmus.h
index 27400a027d41b..1e710720aec70 100644
--- a/tools/perf/util/pmus.h
+++ b/tools/perf/util/pmus.h
@@ -18,7 +18,6 @@ const struct perf_pmu *perf_pmus__pmu_for_pmu_filter(const char *str);
 int perf_pmus__num_mem_pmus(void);
 void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *print_state);
 bool perf_pmus__have_event(const char *pname, const char *name);
-bool perf_pmus__has_hybrid(void);
 int perf_pmus__num_core_pmus(void);
 
 #endif /* __PMUS_H */
diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 7173f6fcdc118..8de1b759bbaa4 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -103,9 +103,9 @@ int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
 	return EOF;
 }
 
-bool perf_pmus__has_hybrid(void)
+int perf_pmus__num_core_pmus(void)
 {
-	return false;
+	return 1;
 }
 
 bool evsel__is_aux_event(const struct evsel *evsel __maybe_unused)
diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index 7ca69151136b3..a2bbdc25d9793 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -696,7 +696,7 @@ static bool evlist__has_hybrid(struct evlist *evlist)
 {
 	struct evsel *evsel;
 
-	if (!perf_pmus__has_hybrid())
+	if (perf_pmus__num_core_pmus() == 1)
 		return false;
 
 	evlist__for_each_entry(evlist, evsel) {