linux-kernel - [PATCH] powerpc/perf: fix fsl_emb_pmu

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Date:	Tue, 20 Jan 2015 16:19:50 -0600
From:	Tom Huynh <tom.huynh@...escale.com>
To:	<benh@...nel.crashing.org>, <paulus@...ba.org>,
	<mpe@...erman.id.au>, <cl@...ux.com>, <tj@...nel.org>
CC:	<kim.phillips@...escale.com>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>, Tom Huynh <tom.huynh@...escale.com>
Subject: [PATCH] powerpc/perf: fix fsl_emb_pmu_start to write correct pmc value

PMCs on PowerPC increases towards 0x80000000 and triggers an overflow
interrupt when the msb is set to collect a sample. Therefore, to setup
for the next sample collection, pmu_start should set the pmc value to
0x80000000 - left instead of left which incorrectly delays the next
overflow interrupt. Same as commit 9a45a9407c69 ("powerpc/perf:
power_pmu_start restores incorrect values, breaking frequency events")
for book3s.

Signed-off-by: Tom Huynh <tom.huynh@...escale.com>
---
 arch/powerpc/perf/core-fsl-emb.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/perf/core-fsl-emb.c b/arch/powerpc/perf/core-fsl-emb.c
index 4acaea0..e9fe904 100644
--- a/arch/powerpc/perf/core-fsl-emb.c
+++ b/arch/powerpc/perf/core-fsl-emb.c
@@ -389,6 +389,7 @@ static void fsl_emb_pmu_del(struct perf_event *event, int flags)
 static void fsl_emb_pmu_start(struct perf_event *event, int ef_flags)
 {
 	unsigned long flags;
+	unsigned long val;
 	s64 left;
 
 	if (event->hw.idx < 0 || !event->hw.sample_period)
@@ -405,7 +406,10 @@ static void fsl_emb_pmu_start(struct perf_event *event, int ef_flags)
 
 	event->hw.state = 0;
 	left = local64_read(&event->hw.period_left);
-	write_pmc(event->hw.idx, left);
+	val = 0;
+	if (left < 0x80000000L)
+		val = 0x80000000L - left;
+	write_pmc(event->hw.idx, val);
 
 	perf_event_update_userpage(event);
 	perf_pmu_enable(event->pmu);
-- 
1.9.1

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