linux-kernel - [tip:perf/urgent] perf tools: Add support for the xtensa architecture

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Message-ID: <tip-3a46817f674389d5fb2f4dce19fbc73ebd1976bb@git.kernel.org>
Date:	Thu, 23 Jan 2014 09:03:47 -0800
From:	tip-bot for Baruch Siach <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	mingo@...hat.com, hpa@...or.com, mingo@...nel.org,
	a.p.zijlstra@...llo.nl, baruch@...s.co.il, jcmvbkbc@...il.com,
	tglx@...utronix.de
Subject: [tip:perf/urgent] perf tools:
  Add support for the xtensa architecture

Commit-ID:  3a46817f674389d5fb2f4dce19fbc73ebd1976bb
Gitweb:     http://git.kernel.org/tip/3a46817f674389d5fb2f4dce19fbc73ebd1976bb
Author:     Baruch Siach <baruch@...s.co.il>
AuthorDate: Mon, 13 Jan 2014 12:27:35 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 20 Jan 2014 16:19:08 -0300

perf tools: Add support for the xtensa architecture

Tested using kernel tracepoints on a QEMU simulated environment.

Kernel support for perf depends on the patch "xtensa: enable
HAVE_PERF_EVENTS", which is scheduled for v3.14.

Hardware performance counters are not supported under xtensa yet.

Acked-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Max Filippov <jcmvbkbc@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: linux-xtensa@...ux-xtensa.org
Link: http://lkml.kernel.org/r/aafcdb22f04e2d3188d2938528939481be56b649.1389608855.git.baruch@tkos.co.il
Signed-off-by: Baruch Siach <baruch@...s.co.il>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/perf.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 3c2f213..7daa806 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -132,6 +132,13 @@
 #define CPUINFO_PROC	"CPU"
 #endif
 
+#ifdef __xtensa__
+#define mb()		asm volatile("memw" ::: "memory")
+#define wmb()		asm volatile("memw" ::: "memory")
+#define rmb()		asm volatile("" ::: "memory")
+#define CPUINFO_PROC	"core ID"
+#endif
+
 #define barrier() asm volatile ("" ::: "memory")
 
 #ifndef cpu_relax
--
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