libperf: Add perf_evsel__alloc_id/perf_evsel__free_id functions

Add perf_evsel__alloc_id()/perf_evsel__free_id() functions to libperf as
internal functions.

Move 'struct perf_sample_id' to internal/evsel.h header and change
'struct perf_sample_id::evsel' to 'struct perf_evsel' and the related
code that touches it.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lore.kernel.org/lkml/20190913132355.21634-28-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/evsel.c

@@ -230,3 +230,33 @@ struct perf_event_attr *perf_evsel__attr(struct perf_evsel *evsel)
 {
 	return &evsel->attr;
 }
+
+int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
+{
+	if (ncpus == 0 || nthreads == 0)
+		return 0;
+
+	if (evsel->system_wide)
+		nthreads = 1;
+
+	evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
+	if (evsel->sample_id == NULL)
+		return -ENOMEM;
+
+	evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
+	if (evsel->id == NULL) {
+		xyarray__delete(evsel->sample_id);
+		evsel->sample_id = NULL;
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+void perf_evsel__free_id(struct perf_evsel *evsel)
+{
+	xyarray__delete(evsel->sample_id);
+	evsel->sample_id = NULL;
+	zfree(&evsel->id);
+	evsel->ids = 0;
+}

tools/perf/lib/include/internal/evsel.h

@@ -5,11 +5,35 @@
 #include <linux/types.h>
 #include <linux/perf_event.h>
 #include <stdbool.h>
+#include <sys/types.h>
 
 struct perf_cpu_map;
 struct perf_thread_map;
 struct xyarray;
 
+/*
+ * Per fd, to map back from PERF_SAMPLE_ID to evsel, only used when there are
+ * more than one entry in the evlist.
+ */
+struct perf_sample_id {
+	struct hlist_node	 node;
+	u64			 id;
+	struct perf_evsel	*evsel;
+       /*
+	* 'idx' will be used for AUX area sampling. A sample will have AUX area
+	* data that will be queued for decoding, where there are separate
+	* queues for each CPU (per-cpu tracing) or task (per-thread tracing).
+	* The sample ID can be used to lookup 'idx' which is effectively the
+	* queue number.
+	*/
+	int			 idx;
+	int			 cpu;
+	pid_t			 tid;
+
+	/* Holds total ID period value for PERF_SAMPLE_READ processing. */
+	u64			 period;
+};
+
 struct perf_evsel {
 	struct list_head	 node;
 	struct perf_event_attr	 attr;
@@ -32,4 +56,7 @@ void perf_evsel__free_fd(struct perf_evsel *evsel);
 int perf_evsel__read_size(struct perf_evsel *evsel);
 int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter);
 
+int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads);
+void perf_evsel__free_id(struct perf_evsel *evsel);
+
 #endif /* __LIBPERF_INTERNAL_EVSEL_H */

tools/perf/tests/event_update.c

@@ -95,7 +95,7 @@ int test__event_update(struct test *test __maybe_unused, int subtest __maybe_unu
 	evsel = perf_evlist__first(evlist);
 
 	TEST_ASSERT_VAL("failed to allocate ids",
-			!perf_evsel__alloc_id(evsel, 1, 1));
+			!perf_evsel__alloc_id(&evsel->core, 1, 1));
 
 	perf_evlist__id_add(evlist, evsel, 0, 0, 123);
 

tools/perf/util/evlist.c

@@ -469,7 +469,7 @@ static void perf_evlist__id_hash(struct evlist *evlist,
 	struct perf_sample_id *sid = SID(evsel, cpu, thread);
 
 	sid->id = id;
-	sid->evsel = evsel;
+	sid->evsel = &evsel->core;
 	hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
 	hlist_add_head(&sid->node, &evlist->core.heads[hash]);
 }
@@ -563,7 +563,7 @@ struct evsel *perf_evlist__id2evsel(struct evlist *evlist, u64 id)
 
 	sid = perf_evlist__id2sid(evlist, id);
 	if (sid)
-		return sid->evsel;
+		return container_of(sid->evsel, struct evsel, core);
 
 	if (!perf_evlist__sample_id_all(evlist))
 		return perf_evlist__first(evlist);
@@ -581,7 +581,7 @@ struct evsel *perf_evlist__id2evsel_strict(struct evlist *evlist,
 
 	sid = perf_evlist__id2sid(evlist, id);
 	if (sid)
-		return sid->evsel;
+		return container_of(sid->evsel, struct evsel, core);
 
 	return NULL;
 }
@@ -635,7 +635,7 @@ struct evsel *perf_evlist__event2evsel(struct evlist *evlist,
 
 	hlist_for_each_entry(sid, head, node) {
 		if (sid->id == id)
-			return sid->evsel;
+			return container_of(sid->evsel, struct evsel, core);
 	}
 	return NULL;
 }
@@ -1018,7 +1018,7 @@ int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
 	evlist__for_each_entry(evlist, evsel) {
 		if ((evsel->core.attr.read_format & PERF_FORMAT_ID) &&
 		    evsel->core.sample_id == NULL &&
-		    perf_evsel__alloc_id(evsel, perf_cpu_map__nr(cpus), threads->nr) < 0)
+		    perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr) < 0)
 			return -ENOMEM;
 	}
 

tools/perf/util/evsel.c

@@ -1227,36 +1227,6 @@ int evsel__disable(struct evsel *evsel)
 	return err;
 }
 
-int perf_evsel__alloc_id(struct evsel *evsel, int ncpus, int nthreads)
-{
-	if (ncpus == 0 || nthreads == 0)
-		return 0;
-
-	if (evsel->core.system_wide)
-		nthreads = 1;
-
-	evsel->core.sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
-	if (evsel->core.sample_id == NULL)
-		return -ENOMEM;
-
-	evsel->core.id = zalloc(ncpus * nthreads * sizeof(u64));
-	if (evsel->core.id == NULL) {
-		xyarray__delete(evsel->core.sample_id);
-		evsel->core.sample_id = NULL;
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-static void perf_evsel__free_id(struct evsel *evsel)
-{
-	xyarray__delete(evsel->core.sample_id);
-	evsel->core.sample_id = NULL;
-	zfree(&evsel->core.id);
-	evsel->core.ids = 0;
-}
-
 static void perf_evsel__free_config_terms(struct evsel *evsel)
 {
 	struct perf_evsel_config_term *term, *h;
@@ -1273,7 +1243,7 @@ void perf_evsel__exit(struct evsel *evsel)
 	assert(evsel->evlist == NULL);
 	perf_evsel__free_counts(evsel);
 	perf_evsel__free_fd(&evsel->core);
-	perf_evsel__free_id(evsel);
+	perf_evsel__free_id(&evsel->core);
 	perf_evsel__free_config_terms(evsel);
 	cgroup__put(evsel->cgrp);
 	perf_cpu_map__put(evsel->core.cpus);
@@ -1992,7 +1962,7 @@ out_close:
 void evsel__close(struct evsel *evsel)
 {
 	perf_evsel__close(&evsel->core);
-	perf_evsel__free_id(evsel);
+	perf_evsel__free_id(&evsel->core);
 }
 
 int perf_evsel__open_per_cpu(struct evsel *evsel,
@@ -2706,7 +2676,7 @@ int perf_evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
 	struct perf_cpu_map *cpus = evsel->core.cpus;
 	struct perf_thread_map *threads = evsel->core.threads;
 
-	if (perf_evsel__alloc_id(evsel, cpus->nr, threads->nr))
+	if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr))
 		return -ENOMEM;
 
 	return store_evsel_ids(evsel, evlist);

tools/perf/util/evsel.h

@@ -17,29 +17,6 @@ struct addr_location;
 struct evsel;
 union perf_event;
 
-/*
- * Per fd, to map back from PERF_SAMPLE_ID to evsel, only used when there are
- * more than one entry in the evlist.
- */
-struct perf_sample_id {
-	struct hlist_node 	node;
-	u64		 	id;
-	struct evsel		*evsel;
-       /*
-	* 'idx' will be used for AUX area sampling. A sample will have AUX area
-	* data that will be queued for decoding, where there are separate
-	* queues for each CPU (per-cpu tracing) or task (per-thread tracing).
-	* The sample ID can be used to lookup 'idx' which is effectively the
-	* queue number.
-	*/
-	int			idx;
-	int			cpu;
-	pid_t			tid;
-
-	/* Holds total ID period value for PERF_SAMPLE_READ processing. */
-	u64			period;
-};
-
 struct cgroup;
 
 /*
@@ -272,8 +249,6 @@ const char *perf_evsel__name(struct evsel *evsel);
 const char *perf_evsel__group_name(struct evsel *evsel);
 int perf_evsel__group_desc(struct evsel *evsel, char *buf, size_t size);
 
-int perf_evsel__alloc_id(struct evsel *evsel, int ncpus, int nthreads);
-
 void __perf_evsel__set_sample_bit(struct evsel *evsel,
 				  enum perf_event_sample_format bit);
 void __perf_evsel__reset_sample_bit(struct evsel *evsel,

tools/perf/util/header.c

@@ -3609,7 +3609,7 @@ int perf_session__read_header(struct perf_session *session)
 		 * for allocating the perf_sample_id table we fake 1 cpu and
 		 * hattr->ids threads.
 		 */
-		if (perf_evsel__alloc_id(evsel, 1, nr_ids))
+		if (perf_evsel__alloc_id(&evsel->core, 1, nr_ids))
 			goto out_delete_evlist;
 
 		lseek(fd, f_attr.ids.offset, SEEK_SET);
@@ -3750,7 +3750,7 @@ int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
 	 * for allocating the perf_sample_id table we fake 1 cpu and
 	 * hattr->ids threads.
 	 */
-	if (perf_evsel__alloc_id(evsel, 1, n_ids))
+	if (perf_evsel__alloc_id(&evsel->core, 1, n_ids))
 		return -ENOMEM;
 
 	for (i = 0; i < n_ids; i++) {

tools/perf/util/session.c

@@ -1324,6 +1324,7 @@ static int deliver_sample_value(struct evlist *evlist,
 				struct machine *machine)
 {
 	struct perf_sample_id *sid = perf_evlist__id2sid(evlist, v->id);
+	struct evsel *evsel;
 
 	if (sid) {
 		sample->id     = v->id;
@@ -1343,7 +1344,8 @@ static int deliver_sample_value(struct evlist *evlist,
 	if (!sample->period)
 		return 0;
 
-	return tool->sample(tool, event, sample, sid->evsel, machine);
+	evsel = container_of(sid->evsel, struct evsel, core);
+	return tool->sample(tool, event, sample, evsel, machine);
 }
 
 static int deliver_sample_group(struct evlist *evlist,