* [PATCH] perf/arm-cmn: Fix the unhandled overflow status of counter 4 to 7
@ 2023-09-25 3:22 Jing Zhang
2023-09-25 9:34 ` Robin Murphy
2023-09-29 17:06 ` Will Deacon
0 siblings, 2 replies; 3+ messages in thread
From: Jing Zhang @ 2023-09-25 3:22 UTC (permalink / raw)
To: Robin Murphy, Ilkka Koskinen, Will Deacon, Mark Rutland
Cc: linux-arm-kernel, linux-kernel, Shuai Xue, Zhuo Song
The register por_dt_pmovsr Bits[7:0] indicates overflow from counters 7
to 0. But in arm_cmn_handle_irq(), only handled the overflow status of
Bits[3:0] which results in unhandled overflow status of counters 4 to 7.
So let the overflow status of DTC counters 4 to 7 to be handled.
Fixes: 0ba64770a2f2 ("perf: Add Arm CMN-600 PMU driver")
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
---
drivers/perf/arm-cmn.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 913dc04..6b50bc5 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -1972,7 +1972,7 @@ static irqreturn_t arm_cmn_handle_irq(int irq, void *dev_id)
u64 delta;
int i;
- for (i = 0; i < CMN_DTM_NUM_COUNTERS; i++) {
+ for (i = 0; i < CMN_DT_NUM_COUNTERS; i++) {
if (status & (1U << i)) {
ret = IRQ_HANDLED;
if (WARN_ON(!dtc->counters[i]))
--
1.8.3.1
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] perf/arm-cmn: Fix the unhandled overflow status of counter 4 to 7
2023-09-25 3:22 [PATCH] perf/arm-cmn: Fix the unhandled overflow status of counter 4 to 7 Jing Zhang
@ 2023-09-25 9:34 ` Robin Murphy
2023-09-29 17:06 ` Will Deacon
1 sibling, 0 replies; 3+ messages in thread
From: Robin Murphy @ 2023-09-25 9:34 UTC (permalink / raw)
To: Jing Zhang, Ilkka Koskinen, Will Deacon, Mark Rutland
Cc: linux-arm-kernel, linux-kernel, Shuai Xue, Zhuo Song
On 2023-09-25 04:22, Jing Zhang wrote:
> The register por_dt_pmovsr Bits[7:0] indicates overflow from counters 7
> to 0. But in arm_cmn_handle_irq(), only handled the overflow status of
> Bits[3:0] which results in unhandled overflow status of counters 4 to 7.
>
> So let the overflow status of DTC counters 4 to 7 to be handled.
Oh dear goodness, how has such a stupid typo managed to exist for 4
years? Truly this is a brown paper bag moment... :(
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
> Fixes: 0ba64770a2f2 ("perf: Add Arm CMN-600 PMU driver")
> Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
> ---
> drivers/perf/arm-cmn.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
> index 913dc04..6b50bc5 100644
> --- a/drivers/perf/arm-cmn.c
> +++ b/drivers/perf/arm-cmn.c
> @@ -1972,7 +1972,7 @@ static irqreturn_t arm_cmn_handle_irq(int irq, void *dev_id)
> u64 delta;
> int i;
>
> - for (i = 0; i < CMN_DTM_NUM_COUNTERS; i++) {
> + for (i = 0; i < CMN_DT_NUM_COUNTERS; i++) {
> if (status & (1U << i)) {
> ret = IRQ_HANDLED;
> if (WARN_ON(!dtc->counters[i]))
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] perf/arm-cmn: Fix the unhandled overflow status of counter 4 to 7
2023-09-25 3:22 [PATCH] perf/arm-cmn: Fix the unhandled overflow status of counter 4 to 7 Jing Zhang
2023-09-25 9:34 ` Robin Murphy
@ 2023-09-29 17:06 ` Will Deacon
1 sibling, 0 replies; 3+ messages in thread
From: Will Deacon @ 2023-09-29 17:06 UTC (permalink / raw)
To: Robin Murphy, Mark Rutland, Ilkka Koskinen, Jing Zhang
Cc: catalin.marinas, kernel-team, Will Deacon, linux-kernel,
Shuai Xue, linux-arm-kernel, Zhuo Song
On Mon, 25 Sep 2023 11:22:32 +0800, Jing Zhang wrote:
> The register por_dt_pmovsr Bits[7:0] indicates overflow from counters 7
> to 0. But in arm_cmn_handle_irq(), only handled the overflow status of
> Bits[3:0] which results in unhandled overflow status of counters 4 to 7.
>
> So let the overflow status of DTC counters 4 to 7 to be handled.
>
>
> [...]
Applied to arm64 (for-next/fixes), thanks!
[1/1] perf/arm-cmn: Fix the unhandled overflow status of counter 4 to 7
https://git.kernel.org/arm64/c/7f949f6f54ff
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
^ permalink raw reply [flat|nested] 3+ messages in thread
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2023-09-25 3:22 [PATCH] perf/arm-cmn: Fix the unhandled overflow status of counter 4 to 7 Jing Zhang
2023-09-25 9:34 ` Robin Murphy
2023-09-29 17:06 ` Will Deacon
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