[tip:perf/core] perf tools: Add stat event read function

[tip-bot for Jiri Olsa]

Commit-ID:  0ea0e3558607626196eb09ace796aac585e61f5c
Gitweb:     http://git.kernel.org/tip/0ea0e3558607626196eb09ace796aac585e61f5c
Author:     Jiri Olsa <jolsa@xxxxxxxxxx>
AuthorDate: Sun, 25 Oct 2015 15:51:32 +0100
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 17 Dec 2015 14:55:43 -0300

perf tools: Add stat event read function

Introducing the perf_event__process_stat_event function to process a
'struct perf_stat' data from a stat event.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Tested-by: Kan Liang <kan.liang@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1445784728-21732-17-git-send-email-jolsa@xxxxxxxxxx
[ Renamed 'stat' parameter to 'st' to fix 'already defined' build error with older distros (e.g. RHEL6.7) ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/stat.c | 23 +++++++++++++++++++++++
 tools/perf/util/stat.h |  6 ++++++
 2 files changed, 29 insertions(+)

diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 2d9d830..0ad59ce 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -341,3 +341,26 @@ int perf_stat_process_counter(struct perf_stat_config *config,
 
 	return 0;
 }
+
+int perf_event__process_stat_event(struct perf_tool *tool __maybe_unused,
+				   union perf_event *event,
+				   struct perf_session *session)
+{
+	struct perf_counts_values count;
+	struct stat_event *st = &event->stat;
+	struct perf_evsel *counter;
+
+	count.val = st->val;
+	count.ena = st->ena;
+	count.run = st->run;
+
+	counter = perf_evlist__id2evsel(session->evlist, st->id);
+	if (!counter) {
+		pr_err("Failed to resolve counter for stat event.\n");
+		return -EINVAL;
+	}
+
+	*perf_counts(counter->counts, st->cpu, st->thread) = count;
+	counter->supported = true;
+	return 0;
+}
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index da1d11c..afe6844 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -90,4 +90,10 @@ void perf_evlist__reset_stats(struct perf_evlist *evlist);
 
 int perf_stat_process_counter(struct perf_stat_config *config,
 			      struct perf_evsel *counter);
+struct perf_tool;
+union perf_event;
+struct perf_session;
+int perf_event__process_stat_event(struct perf_tool *tool,
+				   union perf_event *event,
+				   struct perf_session *session);
 #endif
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