linux-kernel - [PATCH 04/36] libperf: Add perf_mmap_

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Date:   Mon,  7 Oct 2019 14:53:12 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 04/36] libperf: Add perf_mmap__mmap() function

Move perf_mmap__mmap() from tools/perf to libperf, it will be used in
the following patches. And rename the existing perf's function to
mmap__mmap().

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Michael Petlan <mpetlan@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lore.kernel.org/lkml/20190913132355.21634-43-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/lib/include/internal/mmap.h |  2 ++
 tools/perf/lib/mmap.c                  | 18 ++++++++++++++++++
 tools/perf/util/evlist.c               |  2 +-
 tools/perf/util/mmap.c                 | 12 +++---------
 tools/perf/util/mmap.h                 |  2 +-
 5 files changed, 25 insertions(+), 11 deletions(-)

diff --git a/tools/perf/lib/include/internal/mmap.h b/tools/perf/lib/include/internal/mmap.h
index e7a67260940c..7067b70c6f61 100644
--- a/tools/perf/lib/include/internal/mmap.h
+++ b/tools/perf/lib/include/internal/mmap.h
@@ -37,5 +37,7 @@ struct perf_mmap_param {
 size_t perf_mmap__mmap_len(struct perf_mmap *map);
 
 void perf_mmap__init(struct perf_mmap *map, bool overwrite);
+int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
+		    int fd, int cpu);
 
 #endif /* __LIBPERF_INTERNAL_MMAP_H */
diff --git a/tools/perf/lib/mmap.c b/tools/perf/lib/mmap.c
index cc4284da4d99..b216a7db857f 100644
--- a/tools/perf/lib/mmap.c
+++ b/tools/perf/lib/mmap.c
@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
+#include <sys/mman.h>
 #include <internal/mmap.h>
 #include <internal/lib.h>
 
@@ -13,3 +14,20 @@ size_t perf_mmap__mmap_len(struct perf_mmap *map)
 {
 	return map->mask + 1 + page_size;
 }
+
+int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
+		    int fd, int cpu)
+{
+	map->prev = 0;
+	map->mask = mp->mask;
+	map->base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,
+			 MAP_SHARED, fd, 0);
+	if (map->base == MAP_FAILED) {
+		map->base = NULL;
+		return -1;
+	}
+
+	map->fd  = fd;
+	map->cpu = cpu;
+	return 0;
+}
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 666339d4d1cd..055f625dc630 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -671,7 +671,7 @@ static int evlist__mmap_per_evsel(struct evlist *evlist, int idx,
 		if (*output == -1) {
 			*output = fd;
 
-			if (perf_mmap__mmap(&maps[idx], mp, *output, evlist_cpu) < 0)
+			if (mmap__mmap(&maps[idx], mp, *output, evlist_cpu) < 0)
 				return -1;
 		} else {
 			if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index a8e81c4cbae8..acef6e3f6b80 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -353,7 +353,7 @@ static void perf_mmap__setup_affinity_mask(struct mmap *map, struct mmap_params
 		CPU_SET(map->core.cpu, &map->affinity_mask);
 }
 
-int perf_mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
+int mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
 {
 	/*
 	 * The last one will be done at perf_mmap__consume(), so that we
@@ -369,18 +369,12 @@ int perf_mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
 	 * perf_evlist__filter_pollfd().
 	 */
 	refcount_set(&map->core.refcnt, 2);
-	map->core.prev = 0;
-	map->core.mask = mp->core.mask;
-	map->core.base = mmap(NULL, mmap__mmap_len(map), mp->core.prot,
-			 MAP_SHARED, fd, 0);
-	if (map->core.base == MAP_FAILED) {
+
+	if (perf_mmap__mmap(&map->core, &mp->core, fd, cpu)) {
 		pr_debug2("failed to mmap perf event ring buffer, error %d\n",
 			  errno);
-		map->core.base = NULL;
 		return -1;
 	}
-	map->core.fd = fd;
-	map->core.cpu = cpu;
 
 	perf_mmap__setup_affinity_mask(map, mp);
 
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index 2b97dc6d9ee2..a60e6ead7255 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -42,7 +42,7 @@ struct mmap_params {
 	struct auxtrace_mmap_params auxtrace_mp;
 };
 
-int perf_mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu);
+int mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu);
 void perf_mmap__munmap(struct mmap *map);
 
 void perf_mmap__get(struct mmap *map);
-- 
2.21.0