perf parse-events: Wildcard legacy cache events

It is inconsistent that "perf stat -e instructions-retired" wildcard
opens on all PMUs while legacy cache events like "perf stat -e
L1-dcache-load-miss" do not. A behavior introduced by hybrid is that a
legacy cache event like L1-dcache-load-miss should wildcard open on
all hybrid PMUs. Previously hybrid would call to is_event_supported
for each PMU, a failure of which results in the event not being
added. This isn't done in this case as the parser should just create
perf_event_attr and the later open should fail, or the counter give
"<not counted>". If this wants to be avoided then the PMU can be named
with the event.
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ahmad Yasin <ahmad.yasin@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Edward Baker <edward.baker@intel.com>
Cc: Florian Fischer <florian.fischer@muhq.space>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.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: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Samantha Alt <samantha.alt@intel.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Sumanth Korikkar <sumanthk@linux.ibm.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Weilin Wang <weilin.wang@intel.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Link: https://lore.kernel.org/r/20230502223851.2234828-25-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/parse-events-hybrid.c

@@ -179,36 +179,3 @@ int parse_events__add_numeric_hybrid(struct parse_events_state *parse_state,
 	return add_raw_hybrid(parse_state, list, attr, name, metric_id,
 			      config_terms);
 }
-
-int parse_events__add_cache_hybrid(struct list_head *list, int *idx,
-				   struct perf_event_attr *attr,
-				   const char *name,
-				   const char *metric_id,
-				   struct list_head *config_terms,
-				   bool *hybrid,
-				   struct parse_events_state *parse_state)
-{
-	struct perf_pmu *pmu;
-	int ret;
-
-	*hybrid = false;
-	if (!perf_pmu__has_hybrid())
-		return 0;
-
-	*hybrid = true;
-	perf_pmu__for_each_hybrid_pmu(pmu) {
-		LIST_HEAD(terms);
-
-		if (pmu_cmp(parse_state, pmu))
-			continue;
-
-		copy_config_terms(&terms, config_terms);
-		ret = create_event_hybrid(PERF_TYPE_HW_CACHE, idx, list,
-					  attr, name, metric_id, &terms, pmu);
-		free_config_terms(&terms);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}

tools/perf/util/parse-events-hybrid.h

@@ -15,11 +15,4 @@ int parse_events__add_numeric_hybrid(struct parse_events_state *parse_state,
 				     struct list_head *config_terms,
 				     bool *hybrid);
 
-int parse_events__add_cache_hybrid(struct list_head *list, int *idx,
-				   struct perf_event_attr *attr,
-				   const char *name, const char *metric_id,
-				   struct list_head *config_terms,
-				   bool *hybrid,
-				   struct parse_events_state *parse_state);
-
 #endif /* __PERF_PARSE_EVENTS_HYBRID_H */

tools/perf/util/parse-events.c

@@ -472,22 +472,31 @@ static int parse_events__decode_legacy_cache(const char *name, int pmu_type, __u
 
 int parse_events_add_cache(struct list_head *list, int *idx, const char *name,
 			   struct parse_events_error *err,
-			   struct list_head *head_config,
-			   struct parse_events_state *parse_state)
+			   struct list_head *head_config)
 {
-	struct perf_event_attr attr;
+	struct perf_pmu *pmu = NULL;
+	bool found_supported = false;
+	const char *config_name = get_config_name(head_config);
+	const char *metric_id = get_config_metric_id(head_config);
+
+	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
 		LIST_HEAD(config_terms);
-	const char *config_name, *metric_id;
+		struct perf_event_attr attr;
 		int ret;
-	bool hybrid;
 
+		/* Skip unsupported PMUs. */
+		if (!perf_pmu__supports_legacy_cache(pmu))
+			continue;
 
 		memset(&attr, 0, sizeof(attr));
 		attr.type = PERF_TYPE_HW_CACHE;
-	ret = parse_events__decode_legacy_cache(name, /*pmu_type=*/0, &attr.config);
+
+		ret = parse_events__decode_legacy_cache(name, pmu->type, &attr.config);
 		if (ret)
 			return ret;
 
+		found_supported = true;
+
 		if (head_config) {
 			if (config_attr(&attr, head_config, err,
 						config_term_common))
@@ -497,21 +506,14 @@ int parse_events_add_cache(struct list_head *list, int *idx, const char *name,
 				return -ENOMEM;
 		}
 
-	config_name = get_config_name(head_config);
-	metric_id = get_config_metric_id(head_config);
-	ret = parse_events__add_cache_hybrid(list, idx, &attr,
-					     config_name ? : name,
-					     metric_id,
-					     &config_terms,
-					     &hybrid, parse_state);
-	if (hybrid)
-		goto out_free_terms;
+		if (__add_event(list, idx, &attr, /*init_attr*/true, config_name ?: name,
+				metric_id, pmu, &config_terms, /*auto_merge_stats=*/false,
+				/*cpu_list=*/NULL) == NULL)
+			return -ENOMEM;
 
-	ret = add_event(list, idx, &attr, config_name ? : name, metric_id,
-			&config_terms);
-out_free_terms:
 		free_config_terms(&config_terms);
-	return ret;
+	}
+	return found_supported ? 0 : -EINVAL;
 }
 
 #ifdef HAVE_LIBTRACEEVENT

tools/perf/util/parse-events.h

@@ -172,8 +172,7 @@ int parse_events_add_tool(struct parse_events_state *parse_state,
 			  int tool_event);
 int parse_events_add_cache(struct list_head *list, int *idx, const char *name,
 			   struct parse_events_error *error,
-			   struct list_head *head_config,
-			   struct parse_events_state *parse_state);
+			   struct list_head *head_config);
 int parse_events_add_breakpoint(struct list_head *list, int *idx,
 				u64 addr, char *type, u64 len);
 int parse_events_add_pmu(struct parse_events_state *parse_state,

tools/perf/util/parse-events.y

@@ -476,7 +476,7 @@ PE_LEGACY_CACHE opt_event_config
 
 	list = alloc_list();
 	ABORT_ON(!list);
-	err = parse_events_add_cache(list, &parse_state->idx, $1, error, $2, parse_state);
+	err = parse_events_add_cache(list, &parse_state->idx, $1, error, $2);
 
 	parse_events_terms__delete($2);
 	free($1);