linux-kernel - [patch] perf tools: perf list broken on ARM

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Date:	Mon, 9 Dec 2013 16:58:35 -0500 (EST)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Namhyung Kim <namhyung@...nel.org>
cc:	linux-kernel@...r.kernel.org,
	Chad Paradis <chad.paradis@...t.maine.edu>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>
Subject: [patch] perf tools: perf list broken on ARM

Hello,

"perf list" listing of hardware events doesn't work on older ARM devices.
The change enabling event detection:

commit b41f1cec91c37eeea6fdb15effbfa24ea0a5536b
Author: Namhyung Kim <namhyung.kim@....com>
Date:   Tue Aug 27 11:41:53 2013 +0900

    perf list: Skip unsupported events


uses the following code in tools/perf/util/parse-events.c:

       struct perf_event_attr attr = {
               .type = type,
               .config = config,
               .disabled = 1,
               .exclude_kernel = 1,
       };

On ARM machines pre-dating the Cortex-A15 this doesn't work, as
these machines don't support .exclude_kernel.  So starting with 3.12
"perf list" does not report any hardware events at all on older
machines (seen on Rasp-Pi, Pandaboard, Beagleboard, etc).

If we drop the "exclude_kernel" attribute events are properly reported.

Reported-by: Chad Paradis <chad.paradis@...t.maine.edu>
Signed-off-by: Vince Weaver <vincent.weaver@...ne.edu>

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 6de6f89..360ecab 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1087,7 +1087,6 @@ static bool is_event_supported(u8 type, unsigned config)
 		.type = type,
 		.config = config,
 		.disabled = 1,
-		.exclude_kernel = 1,
 	};
 	struct {
 		struct thread_map map;
--
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