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>

tools/perf/arch/x86/tests/hybrid.c

@@ -281,7 +281,7 @@ static int test_events(const struct evlist_test *events, int cnt)
 
 int test__hybrid(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
 {
-	if (!perf_pmus__has_hybrid())
+	if (perf_pmus__num_core_pmus() == 1)
 		return TEST_SKIP;
 
 	return test_events(test__hybrid_events, ARRAY_SIZE(test__hybrid_events));

tools/perf/arch/x86/util/evlist.c

@@ -18,7 +18,7 @@ static int ___evlist__add_default_attrs(struct evlist *evlist,
 	for (i = 0; i < nr_attrs; i++)
 		event_attr_init(attrs + i);
 
-	if (!perf_pmus__has_hybrid())
+	if (perf_pmus__num_core_pmus() == 1)
 		return evlist__add_attrs(evlist, attrs, nr_attrs);
 
 	for (i = 0; i < nr_attrs; i++) {

tools/perf/arch/x86/util/perf_regs.c

@@ -292,7 +292,7 @@ uint64_t arch__intr_reg_mask(void)
 	 */
 	attr.sample_period = 1;
 
-	if (perf_pmus__has_hybrid()) {
+	if (perf_pmus__num_core_pmus() > 1) {
 		struct perf_pmu *pmu = NULL;
 		__u64 type = PERF_TYPE_RAW;
 

tools/perf/builtin-record.c

@@ -1294,7 +1294,7 @@ static int record__open(struct record *rec)
 	 * of waiting or event synthesis.
 	 */
 	if (opts->target.initial_delay || target__has_cpu(&opts->target) ||
-	    perf_pmus__has_hybrid()) {
+	    perf_pmus__num_core_pmus() > 1) {
 		pos = evlist__get_tracking_event(evlist);
 		if (!evsel__is_dummy_event(pos)) {
 			/* Set up dummy event. */
@@ -2193,7 +2193,7 @@ static void record__uniquify_name(struct record *rec)
 	char *new_name;
 	int ret;
 
-	if (!perf_pmus__has_hybrid())
+	if (perf_pmus__num_core_pmus() == 1)
 		return;
 
 	evlist__for_each_entry(evlist, pos) {

tools/perf/tests/attr.c

@@ -185,8 +185,15 @@ static int test__attr(struct test_suite *test __maybe_unused, int subtest __mayb
 	char path_dir[PATH_MAX];
 	char *exec_path;
 
-	if (perf_pmus__has_hybrid())
+	if (perf_pmus__num_core_pmus() > 1) {
+		/*
+		 * TODO: Attribute tests hard code the PMU type. If there are >1
+		 * core PMU then each PMU will have a different type whic
+		 * requires additional support.
+		 */
+		pr_debug("Skip test on hybrid systems");
 		return TEST_SKIP;
+	}
 
 	/* First try development tree tests. */
 	if (!lstat("./tests", &st))

tools/perf/tests/parse-metric.c

@@ -302,11 +302,8 @@ static int test__parse_metric(struct test_suite *test __maybe_unused, int subtes
 	TEST_ASSERT_VAL("DCache_L2 failed", test_dcache_l2() == 0);
 	TEST_ASSERT_VAL("recursion fail failed", test_recursion_fail() == 0);
 	TEST_ASSERT_VAL("Memory bandwidth", test_memory_bandwidth() == 0);
-
-	if (!perf_pmus__has_hybrid()) {
-		TEST_ASSERT_VAL("cache_miss_cycles failed", test_cache_miss_cycles() == 0);
-		TEST_ASSERT_VAL("test metric group", test_metric_group() == 0);
-	}
+	TEST_ASSERT_VAL("cache_miss_cycles failed", test_cache_miss_cycles() == 0);
+	TEST_ASSERT_VAL("test metric group", test_metric_group() == 0);
 	return 0;
 }
 

tools/perf/tests/switch-tracking.c

@@ -375,17 +375,7 @@ static int test__switch_tracking(struct test_suite *test __maybe_unused, int sub
 	cpu_clocks_evsel = evlist__last(evlist);
 
 	/* Second event */
-	if (perf_pmus__has_hybrid()) {
-		cycles = "cpu_core/cycles/u";
-		err = parse_event(evlist, cycles);
-		if (err) {
-			cycles = "cpu_atom/cycles/u";
-			pr_debug("Trying %s\n", cycles);
-			err = parse_event(evlist, cycles);
-		}
-	} else {
-		err = parse_event(evlist, cycles);
-	}
+	err = parse_event(evlist, cycles);
 	if (err) {
 		pr_debug("Failed to parse event %s\n", cycles);
 		goto out_err;

tools/perf/tests/topology.c

@@ -41,18 +41,8 @@ static int session_write_header(char *path)
 	session = perf_session__new(&data, NULL);
 	TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
 
-	if (!perf_pmus__has_hybrid()) {
-		session->evlist = evlist__new_default();
-		TEST_ASSERT_VAL("can't get evlist", session->evlist);
-	} else {
-		struct parse_events_error err;
-
-		session->evlist = evlist__new();
-		TEST_ASSERT_VAL("can't get evlist", session->evlist);
-		parse_events_error__init(&err);
-		parse_events(session->evlist, "cpu_core/cycles/", &err);
-		parse_events_error__exit(&err);
-	}
+	session->evlist = evlist__new_default();
+	TEST_ASSERT_VAL("can't get evlist", session->evlist);
 
 	perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY);
 	perf_header__set_feat(&session->header, HEADER_NRCPUS);

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);

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;

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);

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));

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);

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;

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 */

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)

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) {