perf pmu: Detect ARM and hybrid PMUs with sysfs

is_arm_pmu_core detects a core PMU via the presence of a "cpus" file
rather than a "cpumask" file. This pattern holds for hybrid PMUs so
rename the function and remove redundant perf_pmu__is_hybrid
tests.

Add a new helper is_pmu_hybrid similar to is_pmu_core.

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/20230527072210.2900565-5-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/pmu.c

@@ -643,12 +643,14 @@ static char *pmu_id(const char *name)
 	return str;
 }
 
-/*
- *  PMU CORE devices have different name other than cpu in sysfs on some
- *  platforms.
- *  Looking for possible sysfs files to identify the arm core device.
+/**
+ * is_sysfs_pmu_core() - PMU CORE devices have different name other than cpu in
+ *         sysfs on some platforms like ARM or Intel hybrid. Looking for
+ *         possible the cpus file in sysfs files to identify whether this is a
+ *         core device.
+ * @name: The PMU name such as "cpu_atom".
  */
-static int is_arm_pmu_core(const char *name)
+static int is_sysfs_pmu_core(const char *name)
 {
 	char path[PATH_MAX];
 
@@ -814,7 +816,7 @@ void pmu_add_cpu_aliases_table(struct list_head *head, struct perf_pmu *pmu,
 	struct pmu_add_cpu_aliases_map_data data = {
 		.head = head,
 		.name = pmu->name,
-		.cpu_name = is_arm_pmu_core(pmu->name) ? pmu->name : "cpu",
+		.cpu_name = is_sysfs_pmu_core(pmu->name) ? pmu->name : "cpu",
 		.pmu = pmu,
 	};
 
@@ -1647,22 +1649,27 @@ static int cmp_sevent(const void *a, const void *b)
 
 bool is_pmu_core(const char *name)
 {
-	return !strcmp(name, "cpu") || is_arm_pmu_core(name);
+	return !strcmp(name, "cpu") || is_sysfs_pmu_core(name);
+}
+
+bool is_pmu_hybrid(const char *name)
+{
+	return !strcmp(name, "cpu_atom") || !strcmp(name, "cpu_core");
 }
 
 bool perf_pmu__supports_legacy_cache(const struct perf_pmu *pmu)
 {
-	return is_pmu_core(pmu->name) || perf_pmu__is_hybrid(pmu->name);
+	return is_pmu_core(pmu->name);
 }
 
 bool perf_pmu__supports_wildcard_numeric(const struct perf_pmu *pmu)
 {
-	return is_pmu_core(pmu->name) || perf_pmu__is_hybrid(pmu->name);
+	return is_pmu_core(pmu->name);
 }
 
 bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu)
 {
-	return !perf_pmu__is_hybrid(pmu->name);
+	return !is_pmu_hybrid(pmu->name);
 }
 
 static bool pmu_alias_is_duplicate(struct sevent *alias_a,
@@ -1716,7 +1723,7 @@ void print_pmu_events(const struct print_callbacks *print_cb, void *print_state)
 	pmu = NULL;
 	j = 0;
 	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
-		bool is_cpu = is_pmu_core(pmu->name) || perf_pmu__is_hybrid(pmu->name);
+		bool is_cpu = is_pmu_core(pmu->name);
 
 		list_for_each_entry(event, &pmu->aliases, list) {
 			aliases[j].event = event;

tools/perf/util/pmu.h

@@ -220,6 +220,7 @@ void perf_pmu__del_formats(struct list_head *formats);
 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu);
 
 bool is_pmu_core(const char *name);
+bool is_pmu_hybrid(const char *name);
 bool perf_pmu__supports_legacy_cache(const struct perf_pmu *pmu);
 bool perf_pmu__supports_wildcard_numeric(const struct perf_pmu *pmu);
 bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu);