perf symbols: map_groups__find_symbol must return the map too

Tools need to know from which map in the map_group a symbol was resolved
to, so that, for isntance, we can annotate kernel modules symbols by
getting its precise name, etc.

Also add the _by_name variants for completeness.

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-kmem.c

@@ -369,7 +369,8 @@ static void __print_result(struct rb_root *root, struct perf_session *session,
 		if (is_caller) {
 			addr = data->call_site;
 			if (!raw_ip)
-				sym = map_groups__find_function(&session->kmaps, addr, NULL);
+				sym = map_groups__find_function(&session->kmaps,
+								addr, NULL, NULL);
 		} else
 			addr = data->ptr;
 

tools/perf/util/map.c

@@ -268,12 +268,38 @@ void map_groups__flush(struct map_groups *self)
 
 struct symbol *map_groups__find_symbol(struct map_groups *self,
 				       enum map_type type, u64 addr,
+				       struct map **mapp,
 				       symbol_filter_t filter)
 {
 	struct map *map = map_groups__find(self, type, addr);
 
-	if (map != NULL)
+	if (map != NULL) {
+		if (mapp != NULL)
+			*mapp = map;
 		return map__find_symbol(map, map->map_ip(map, addr), filter);
+	}
+
+	return NULL;
+}
+
+struct symbol *map_groups__find_symbol_by_name(struct map_groups *self,
+					       enum map_type type,
+					       const char *name,
+					       struct map **mapp,
+					       symbol_filter_t filter)
+{
+	struct rb_node *nd;
+
+	for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
+		struct map *pos = rb_entry(nd, struct map, rb_node);
+		struct symbol *sym = map__find_symbol_by_name(pos, name, filter);
+
+		if (sym == NULL)
+			continue;
+		if (mapp != NULL)
+			*mapp = pos;
+		return sym;
+	}
 
 	return NULL;
 }

tools/perf/util/map.h

@@ -119,13 +119,28 @@ static inline struct map *map_groups__find(struct map_groups *self,
 
 struct symbol *map_groups__find_symbol(struct map_groups *self,
 				       enum map_type type, u64 addr,
+				       struct map **mapp,
 				       symbol_filter_t filter);
 
-static inline struct symbol *map_groups__find_function(struct map_groups *self,
-						       u64 addr,
-						       symbol_filter_t filter)
+struct symbol *map_groups__find_symbol_by_name(struct map_groups *self,
+					       enum map_type type,
+					       const char *name,
+					       struct map **mapp,
+					       symbol_filter_t filter);
+
+static inline
+struct symbol *map_groups__find_function(struct map_groups *self, u64 addr,
+					 struct map **mapp, symbol_filter_t filter)
+{
+	return map_groups__find_symbol(self, MAP__FUNCTION, addr, mapp, filter);
+}
+
+static inline
+struct symbol *map_groups__find_function_by_name(struct map_groups *self,
+						 const char *name, struct map **mapp,
+						 symbol_filter_t filter)
 {
-	return map_groups__find_symbol(self, MAP__FUNCTION, addr, filter);
+	return map_groups__find_symbol_by_name(self, MAP__FUNCTION, name, mapp, filter);
 }
 
 int map_groups__fixup_overlappings(struct map_groups *self, struct map *map,