libperf: Adopt perf_mmap__put() function from tools/perf

Move perf_mmap__put() from tools/perf to libperf.

Once perf_mmap__put() is moved, we need a way to call application
related unmap code (AIO and aux related code for eprf), when the map
goes away.

Add the perf_mmap::unmap callback to do that.

The unmap path from perf is:

  perf_mmap__put                           (libperf)
    perf_mmap__munmap                      (libperf)
      map->unmap_cb -> perf_mmap__unmap_cb (perf)
        mmap__munmap                       (perf)

Committer notes:

Add missing linux/kernel.h to tools/perf/lib/mmap.c to get the BUG_ON
definition.

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 <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20191007125344.14268-8-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 13 insertions, 17 deletions

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 0b877d39a660..4394a5a10ce9 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -433,7 +433,7 @@ static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
 	struct mmap *map = fda->priv[fd].ptr;
 
 	if (map)
-		perf_mmap__put(map);
+		perf_mmap__put(&map->core);
 }
 
 int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
@@ -601,11 +601,11 @@ static void evlist__munmap_nofree(struct evlist *evlist)
 
 	if (evlist->mmap)
 		for (i = 0; i < evlist->core.nr_mmaps; i++)
-			mmap__munmap(&evlist->mmap[i]);
+			perf_mmap__munmap(&evlist->mmap[i].core);
 
 	if (evlist->overwrite_mmap)
 		for (i = 0; i < evlist->core.nr_mmaps; i++)
-			mmap__munmap(&evlist->overwrite_mmap[i]);
+			perf_mmap__munmap(&evlist->overwrite_mmap[i].core);
 }
 
 void evlist__munmap(struct evlist *evlist)
@@ -615,6 +615,13 @@ void evlist__munmap(struct evlist *evlist)
 	zfree(&evlist->overwrite_mmap);
 }
 
+static void perf_mmap__unmap_cb(struct perf_mmap *map)
+{
+	struct mmap *m = container_of(map, struct mmap, core);
+
+	mmap__munmap(m);
+}
+
 static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
 				       bool overwrite)
 {
@@ -638,7 +645,7 @@ static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
 		 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
 		 * thus does perf_mmap__get() on it.
 		 */
-		perf_mmap__init(&map[i].core, overwrite);
+		perf_mmap__init(&map[i].core, overwrite, perf_mmap__unmap_cb);
 	}
 
 	return map;
@@ -715,7 +722,7 @@ static int evlist__mmap_per_evsel(struct evlist *evlist, int idx,
 		 */
 		if (!evsel->core.system_wide &&
 		     perf_evlist__add_pollfd(&evlist->core, fd, &maps[idx], revent) < 0) {
-			perf_mmap__put(&maps[idx]);
+			perf_mmap__put(&maps[idx].core);
 			return -1;
 		}
 
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 2c73b5bcf74e..9f150d50cea5 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -110,14 +110,6 @@ static bool perf_mmap__empty(struct mmap *map)
 	return perf_mmap__read_head(map) == map->core.prev && !map->auxtrace_mmap.base;
 }
 
-void perf_mmap__put(struct mmap *map)
-{
-	BUG_ON(map->core.base && refcount_read(&map->core.refcnt) == 0);
-
-	if (refcount_dec_and_test(&map->core.refcnt))
-		mmap__munmap(map);
-}
-
 void perf_mmap__consume(struct mmap *map)
 {
 	if (!map->core.overwrite) {
@@ -127,7 +119,7 @@ void perf_mmap__consume(struct mmap *map)
 	}
 
 	if (refcount_read(&map->core.refcnt) == 1 && perf_mmap__empty(map))
-		perf_mmap__put(map);
+		perf_mmap__put(&map->core);
 }
 
 int __weak auxtrace_mmap__mmap(struct auxtrace_mmap *mm __maybe_unused,
@@ -308,7 +300,6 @@ static void perf_mmap__aio_munmap(struct mmap *map __maybe_unused)
 
 void mmap__munmap(struct mmap *map)
 {
-	perf_mmap__munmap(&map->core);
 	perf_mmap__aio_munmap(map);
 	if (map->data != NULL) {
 		munmap(map->data, mmap__mmap_len(map));
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index 6a18b2990059..78e3c4436ce8 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -45,8 +45,6 @@ struct mmap_params {
 int mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu);
 void mmap__munmap(struct mmap *map);
 
-void perf_mmap__put(struct mmap *map);
-
 void perf_mmap__consume(struct mmap *map);
 
 static inline u64 perf_mmap__read_head(struct mmap *mm)