linux-kernel - [PATCH v3] perf: add support for the xtensa architecture

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Date:	Mon, 13 Jan 2014 12:27:35 +0200
From:	Baruch Siach <baruch@...s.co.il>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	linux-kernel@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	Baruch Siach <baruch@...s.co.il>
Subject: [PATCH v3] perf: 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: Max Filippov <jcmvbkbc@...il.com>
Signed-off-by: Baruch Siach <baruch@...s.co.il>
---
v2: use the "core ID" field from /proc/cpuinfo (Max Filippov)

v3: add testing and kernel dependency information (Ingo Molnar)
---
 tools/perf/perf.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index b079304bd53d..e441864dbe03 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
-- 
1.8.5.2

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