[PATCH 3/8] perf tools: Add support for the xtensa architecture

[Arnaldo Carvalho de Melo]

From: Baruch Siach <baruch@xxxxxxxxxx>

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

diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 3c2f213e979d..7daa806d9050 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
-- 
1.8.1.4

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