This is a note to let you know that I've just added the patch titled
powerpc/perf: Fix SDAR_MODE value for continous sampling on Power9
to the 4.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-perf-fix-sdar_mode-value-for-continous-sampling-on-power9.patch
and it can be found in the queue-4.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 20dd4c624d25156d5ec3345bbb690b98175ef879 Mon Sep 17 00:00:00 2001
From: Madhavan Srinivasan <maddy@xxxxxxxxxxxxxxxxxx>
Date: Tue, 11 Jul 2017 16:27:49 +0530
Subject: powerpc/perf: Fix SDAR_MODE value for continous sampling on Power9
From: Madhavan Srinivasan <maddy@xxxxxxxxxxxxxxxxxx>
commit 20dd4c624d25156d5ec3345bbb690b98175ef879 upstream.
In case of continous sampling (non-marked), the code currently
sets MMCRA[SDAR_MODE] to 0b01 (Update on TLB miss) for Power9 DD1.
On DD2 and later it copies the sdar_mode value from the event code,
which for most events is 0b00 (No updates).
However we must set a non-zero value for SDAR_MODE when doing
continuous sampling, so honor the event code, unless it's zero, in
which case we use use 0b01 (Update on TLB miss).
Fixes: 78b4416aa249 ("powerpc/perf: Handle sdar_mode for marked event in power9")
Signed-off-by: Madhavan Srinivasan <maddy@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/perf/isa207-common.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/arch/powerpc/perf/isa207-common.c
+++ b/arch/powerpc/perf/isa207-common.c
@@ -90,13 +90,15 @@ static void mmcra_sdar_mode(u64 event, u
* MMCRA[SDAR_MODE] will be set to 0b01
* For rest
* MMCRA[SDAR_MODE] will be set from event code.
+ * If sdar_mode from event is zero, default to 0b01. Hardware
+ * requires that we set a non-zero value.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
if (is_event_marked(event) || (*mmcra & MMCRA_SAMPLE_ENABLE))
*mmcra &= MMCRA_SDAR_MODE_NO_UPDATES;
- else if (!cpu_has_feature(CPU_FTR_POWER9_DD1))
+ else if (!cpu_has_feature(CPU_FTR_POWER9_DD1) && p9_SDAR_MODE(event))
*mmcra |= p9_SDAR_MODE(event) << MMCRA_SDAR_MODE_SHIFT;
- else if (cpu_has_feature(CPU_FTR_POWER9_DD1))
+ else
*mmcra |= MMCRA_SDAR_MODE_TLB;
} else
*mmcra |= MMCRA_SDAR_MODE_TLB;
Patches currently in stable-queue which might be from maddy@xxxxxxxxxxxxxxxxxx are
queue-4.12/powerpc-perf-fix-sdar_mode-value-for-continous-sampling-on-power9.patch