[PATCH 56/73] libperf: Add perf_evlist_mmap_ops::mmap callback

From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Michael Petlan <mpetlan@redhat.com>
Subject: [PATCH 56/73] libperf: Add perf_evlist_mmap_ops::mmap callback
Date: Fri, 13 Sep 2019 15:23:38 +0200	[thread overview]
Message-ID: <20190913132355.21634-57-jolsa@kernel.org> (raw)
In-Reply-To: <20190913132355.21634-1-jolsa@kernel.org>

Adding perf_evlist_mmap_ops::mmap callback to be called
in mmap_per_evsel to actually mmap the map.

Adding libperf's perf_evlist__mmap_cb_mmap function as
libperf's mmap callback.

Link: http://lkml.kernel.org/n/tip-9cksnv3xbb1eset7ge67at4a@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/lib/evlist.c                  | 15 ++++++++++++---
 tools/perf/lib/include/internal/evlist.h |  3 +++
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c
index 8caced7d489a..ec83022cd62f 100644
--- a/tools/perf/lib/evlist.c
+++ b/tools/perf/lib/evlist.c
@@ -341,6 +341,14 @@ perf_evlist__mmap_cb_new(struct perf_evlist *evlist, bool overwrite, int idx)
 	return map;
 }
 
+static int
+perf_evlist__mmap_cb_mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
+			  int output, int cpu)
+{
+	refcount_set(&map->refcnt, 2);
+	return perf_mmap__mmap(map, mp, output, cpu);
+}
+
 static int
 mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
 	       int idx, struct perf_mmap_param *mp, int cpu_idx,
@@ -379,7 +387,7 @@ mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
 		if (*output == -1) {
 			*output = fd;
 
-			if (perf_mmap__mmap(map, mp, *output, evlist_cpu) < 0)
+			if (ops->mmap(map, mp, *output, evlist_cpu) < 0)
 				return -1;
 		} else {
 			if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
@@ -471,7 +479,7 @@ int perf_evlist__mmap_ops(struct perf_evlist *evlist,
 	const struct perf_cpu_map *cpus = evlist->cpus;
 	const struct perf_thread_map *threads = evlist->threads;
 
-	if (!ops || !ops->new)
+	if (!ops || !ops->new || !ops->mmap)
 		return -EINVAL;
 
 	perf_evlist__for_each_entry(evlist, evsel) {
@@ -491,7 +499,8 @@ int perf_evlist__mmap(struct perf_evlist *evlist, int pages)
 {
 	struct perf_mmap_param mp;
 	struct perf_evlist_mmap_ops ops = {
-		.new = perf_evlist__mmap_cb_new,
+		.new  = perf_evlist__mmap_cb_new,
+		.mmap = perf_evlist__mmap_cb_mmap,
 	};
 
 	if (!evlist->mmap && perf_evlist__alloc_maps(evlist))
diff --git a/tools/perf/lib/include/internal/evlist.h b/tools/perf/lib/include/internal/evlist.h
index 3cb836912ee6..851837ce4ff8 100644
--- a/tools/perf/lib/include/internal/evlist.h
+++ b/tools/perf/lib/include/internal/evlist.h
@@ -31,10 +31,13 @@ typedef void
 (*perf_evlist_mmap__cb_idx_t)(struct perf_evlist*, struct perf_mmap_param*, int, bool);
 typedef struct perf_mmap*
 (*perf_evlist_mmap__cb_new_t)(struct perf_evlist*, bool, int);
+typedef int
+(*perf_evlist_mmap__cb_mmap_t)(struct perf_mmap*, struct perf_mmap_param*, int, int);
 
 struct perf_evlist_mmap_ops {
 	perf_evlist_mmap__cb_idx_t	idx;
 	perf_evlist_mmap__cb_new_t	new;
+	perf_evlist_mmap__cb_mmap_t	mmap;
 };
 
 int perf_evlist__alloc_pollfd(struct perf_evlist *evlist);
-- 
2.21.0

