libperf: Adopt perf_evlist__enable()/disable() functions from perf

Adopt the following functions from tools/perf:

  perf_evlist__enable()
  perf_evlist__disable()
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-70-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/evlist.c

@@ -141,3 +141,19 @@ void perf_evlist__close(struct perf_evlist *evlist)
 	perf_evlist__for_each_entry_reverse(evlist, evsel)
 		perf_evsel__close(evsel);
 }
+
+void perf_evlist__enable(struct perf_evlist *evlist)
+{
+	struct perf_evsel *evsel;
+
+	perf_evlist__for_each_entry(evlist, evsel)
+		perf_evsel__enable(evsel);
+}
+
+void perf_evlist__disable(struct perf_evlist *evlist)
+{
+	struct perf_evsel *evsel;
+
+	perf_evlist__for_each_entry(evlist, evsel)
+		perf_evsel__disable(evsel);
+}

tools/perf/lib/include/perf/evlist.h

@@ -20,6 +20,8 @@ LIBPERF_API struct perf_evsel* perf_evlist__next(struct perf_evlist *evlist,
 						 struct perf_evsel *evsel);
 LIBPERF_API int perf_evlist__open(struct perf_evlist *evlist);
 LIBPERF_API void perf_evlist__close(struct perf_evlist *evlist);
+LIBPERF_API void perf_evlist__enable(struct perf_evlist *evlist);
+LIBPERF_API void perf_evlist__disable(struct perf_evlist *evlist);
 
 #define perf_evlist__for_each_evsel(evlist, pos)	\
 	for ((pos) = perf_evlist__next((evlist), NULL);	\

tools/perf/lib/libperf.map

@@ -27,6 +27,8 @@ LIBPERF_0.0.1 {
 		perf_evlist__delete;
 		perf_evlist__open;
 		perf_evlist__close;
+		perf_evlist__enable;
+		perf_evlist__disable;
 		perf_evlist__init;
 		perf_evlist__add;
 		perf_evlist__remove;