[PATCH] perf: arm_cspmu: Reject events meant for other PMUs

[Besar Wicaksono]

Hi Ilkka,

Thanks for fixing it.

Reviewed-by: Besar Wicaksono <bwicaksono at nvidia.com>

Regards,
Besar

> -----Original Message-----
> From: Ilkka Koskinen <ilkka at os.amperecomputing.com>
> Sent: Thursday, November 2, 2023 7:17 PM
> To: Besar Wicaksono <bwicaksono at nvidia.com>; Suzuki K Poulose
> <suzuki.poulose at arm.com>; Robin Murphy <robin.murphy at arm.com>; Will
> Deacon <will at kernel.org>; Mark Rutland <mark.rutland at arm.com>; Raag
> Jadav <raag.jadav at intel.com>; Ilkka Koskinen
> <ilkka at os.amperecomputing.com>
> Cc: linux-arm-kernel at lists.infradead.org; linux-kernel at vger.kernel.org
> Subject: [PATCH] perf: arm_cspmu: Reject events meant for other PMUs
> 
> External email: Use caution opening links or attachments
> 
> 
> Coresight PMU driver didn't reject events meant for other PMUs.
> This caused some of the Core PMU events disappearing from
> the output of "perf list". In addition, trying to run e.g.
> 
>      $ perf stat -e r2 sleep 1
> 
> made Coresight PMU driver to handle the event instead of letting
> Core PMU driver to deal with it.
> 
> Cc: stable at vger.kernel.org
> Fixes: e37dfd65731d ("perf: arm_cspmu: Add support for ARM CoreSight
> PMU driver")
> Signed-off-by: Ilkka Koskinen <ilkka at os.amperecomputing.com>
> ---
>  drivers/perf/arm_cspmu/arm_cspmu.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c
> b/drivers/perf/arm_cspmu/arm_cspmu.c
> index 42b72042f6b3..2cc35dded007 100644
> --- a/drivers/perf/arm_cspmu/arm_cspmu.c
> +++ b/drivers/perf/arm_cspmu/arm_cspmu.c
> @@ -676,6 +676,9 @@ static int arm_cspmu_event_init(struct perf_event
> *event)
> 
>         cspmu = to_arm_cspmu(event->pmu);
> 
> +       if (event->attr.type != event->pmu->type)
> +               return -ENOENT;
> +
>         /*
>          * Following other "uncore" PMUs, we do not support sampling mode or
>          * attach to a task (per-process mode).
> --
> 2.40.1