linux-kernel - [PATCH v9 06/11] powerpc/perf: Implement get_cpu

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Message-Id: <1428993665-2133-7-git-send-email-sukadev@linux.vnet.ibm.com>
Date:	Mon, 13 Apr 2015 23:40:59 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	mingo@...hat.com, ak@...ux.intel.com,
	Michael Ellerman <mpe@...erman.id.au>,
	Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	peterz@...radead.org, namhyung@...nel.org,
	linuxppc-dev@...ts.ozlabs.org, <linux-kernel@...r.kernel.org>
Subject: [PATCH v9 06/11] powerpc/perf: Implement get_cpu_str()

With a file ~/.cache/pmu-events/004d0100-core.json describing Power8
PMU events we would need to run:

	perf stat \
		--events-file ~/.cache/pmu-events/004d0100-core.json \
		-e pm_cyc sleep 1

With this get_cpu_str(), on Powerpc, we can skip the --events-file option
and run:

	perf stat -e pm_cyc sleep 1

Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
---
Changelog[v9] by Sukadev Bhattiprolu
	Rebase to 4.0.

Changelog[v3]:
        [Tobias Klauser]: Fix some changelog damage to patch.

Changelog[v2]:
	[Michael Ellerman]: Use PVR instead of AUXV variables
---
 tools/perf/arch/powerpc/util/header.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/perf/arch/powerpc/util/header.c b/tools/perf/arch/powerpc/util/header.c
index 6c1b8a7..306bf35 100644
--- a/tools/perf/arch/powerpc/util/header.c
+++ b/tools/perf/arch/powerpc/util/header.c
@@ -6,6 +6,7 @@
 
 #include "../../util/header.h"
 #include "../../util/util.h"
+#include "../../util/jevents.h"
 
 #define mfspr(rn)       ({unsigned long rval; \
 			 asm volatile("mfspr %0," __stringify(rn) \
@@ -32,3 +33,14 @@ get_cpuid(char *buffer, size_t sz)
 	}
 	return -1;
 }
+
+char *
+get_cpu_str(void)
+{
+	char *bufp;
+
+	if (asprintf(&bufp, "%.8lx-core", mfspr(SPRN_PVR)) < 0)
+		bufp = NULL;
+
+	return bufp;
+}
-- 
1.7.9.5

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