[RFC PATCH v3 08/18] perf stat: Add functions to get counter info

[weilin . wang]

From: Weilin Wang <weilin.wang@xxxxxxxxx>

Add data structure metricgroup__pmu_counters to represent hardware counters
available in the system.

Add functions to parse pmu-events and create the list of pmu_info_list to
hold the counter information of the system.

Add functions to free pmu_info_list and event_info_list before exit
grouping for hardware-grouping method

This method would fall back to normal grouping when event json files do not
support hardware aware grouping.

Signed-off-by: Weilin Wang <weilin.wang@xxxxxxxxx>
---
 tools/perf/util/metricgroup.c | 85 +++++++++++++++++++++++++++++++++--
 tools/perf/util/metricgroup.h | 15 +++++++
 2 files changed, 97 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 24268882d355..a393584c7a73 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -1507,6 +1507,27 @@ static int parse_counter(const char *counter,
 	return 0;
 }
 
+static void metricgroup__free_event_info(struct list_head
+					*event_info_list)
+{
+	struct metricgroup__event_info *e, *tmp;
+
+	list_for_each_entry_safe(e, tmp, event_info_list, nd) {
+		list_del_init(&e->nd);
+		free(e);
+	}
+}
+
+static void metricgroup__free_pmu_info(struct list_head *pmu_info_list)
+{
+	struct metricgroup__pmu_counters *p, *tmp;
+
+	list_for_each_entry_safe(p, tmp, pmu_info_list, nd) {
+		list_del_init(&p->nd);
+		free(p);
+	}
+}
+
 static struct metricgroup__event_info *event_info__new(const char *name,
 						      const char *pmu_name,
 						      const char *counter,
@@ -1525,7 +1546,7 @@ static struct metricgroup__event_info *event_info__new(const char *name,
 
 	e->name = name;
 	e->free_counter = free_counter;
-	e->pmu_name = strdup(pmu_name);
+	e->pmu_name = pmu_name;
 	if (free_counter) {
 		ret = set_counter_bitmap(0, e->counters);
 		if (ret)
@@ -1560,6 +1581,8 @@ static int metricgroup__add_metric_event_callback(const struct pmu_event *pe,
 	struct metricgroup__add_metric_event_data *d = data;
 
 	if (!strcasecmp(pe->name, d->event_name)) {
+		if (!pe->counter)
+			return -EINVAL;
 		event = event_info__new(d->event_id, pe->pmu, pe->counter, /*free_counter=*/false);
 		if (!event)
 			return -ENOMEM;
@@ -1599,7 +1622,7 @@ static int get_metricgroup_events(const char *full_id,
 			.event_name = id,
 			.event_id = full_id,
 		};
-		ret = pmu_events_table_for_each_event(table,
+		ret = pmu_events_table__for_each_event(table, /*pmu=*/NULL,
 				metricgroup__add_metric_event_callback, &data);
 	}
 
@@ -1608,6 +1631,57 @@ static int get_metricgroup_events(const char *full_id,
 	return ret;
 }
 
+static struct metricgroup__pmu_counters *pmu_layout__new(const struct pmu_layout *pl)
+{
+	struct metricgroup__pmu_counters *l;
+
+	l = zalloc(sizeof(*l));
+
+	if (!l)
+		return NULL;
+
+	l->name = pl->pmu;
+	l->size = pl->size;
+	l->fixed_size = pl->fixed_size;
+	pr_debug("create new pmu_layout: [pmu]=%s, [gp_size]=%ld, [fixed_size]=%ld\n",
+		l->name, l->size, l->fixed_size);
+	return l;
+}
+
+static int metricgroup__add_pmu_layout_callback(const struct pmu_layout *pl,
+						void *data)
+{
+	struct metricgroup__pmu_counters *pmu;
+	struct list_head *d = data;
+	int ret = 0;
+
+	pmu = pmu_layout__new(pl);
+	if (!pmu)
+		return -ENOMEM;
+	list_add(&pmu->nd, d);
+	return ret;
+}
+
+/**
+ * get_pmu_counter_layouts - Find counter info of the architecture from
+ * the pmu_layouts table
+ * @pmu_info_list: the list that the new counter info of a pmu is added to.
+ * @table: pmu_layouts table that is searched for counter info.
+ */
+static int get_pmu_counter_layouts(struct list_head *pmu_info_list,
+				   const struct pmu_layouts_table
+				   *table)
+{
+	LIST_HEAD(list);
+	int ret;
+
+	ret = pmu_layouts_table__for_each_layout(table,
+						metricgroup__add_pmu_layout_callback, &list);
+
+	list_splice(&list, pmu_info_list);
+	return ret;
+}
+
 /**
  * hw_aware_build_grouping - Build event groupings by reading counter
  * requirement of the events and counter available on the system from
@@ -1626,6 +1700,7 @@ static int hw_aware_build_grouping(struct expr_parse_ctx *ctx __maybe_unused,
 	LIST_HEAD(event_info_list);
 	size_t bkt;
 	const struct pmu_events_table *etable = perf_pmu__find_events_table(NULL);
+	const struct pmu_layouts_table *ltable = perf_pmu__find_layouts_table(NULL);
 
 #define RETURN_IF_NON_ZERO(x) do { if (x) return x; } while (0)
 	hashmap__for_each_entry(ctx->ids, cur, bkt) {
@@ -1635,9 +1710,13 @@ static int hw_aware_build_grouping(struct expr_parse_ctx *ctx __maybe_unused,
 
 		ret = get_metricgroup_events(id, etable, &event_info_list);
 		if (ret)
-			return ret;
+			goto err_out;
 	}
+	ret = get_pmu_counter_layouts(&pmu_info_list, ltable);
 
+err_out:
+	metricgroup__free_event_info(&event_info_list);
+	metricgroup__free_pmu_info(&pmu_info_list);
 	return ret;
 #undef RETURN_IF_NON_ZERO
 }
diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
index 3704545c9a11..802ca15e7c6b 100644
--- a/tools/perf/util/metricgroup.h
+++ b/tools/perf/util/metricgroup.h
@@ -94,6 +94,21 @@ struct metricgroup__event_info {
 	DECLARE_BITMAP(counters, NR_COUNTERS);
 };
 
+/**
+ * A node is the counter availability of a pmu.
+ * This info is built up at the beginning from JSON file and
+ * used as a reference in metric grouping process.
+ */
+struct metricgroup__pmu_counters {
+	struct list_head nd;
+	/** The name of the pmu the event collected on. */
+	const char *name;
+	//DECLARE_BITMAP(counter_bits, NR_COUNTERS);
+	/** The number of gp counters in the pmu. */
+	size_t size;
+	size_t fixed_size;
+};
+
 /**
  * Each group is one node in the group string list.
  */
-- 
2.39.3