Re: [PATCH V11 01/10] drivers: perf: arm_pmu: Add new sched_task() callback

[Mark Rutland]

On Wed, May 31, 2023 at 09:34:19AM +0530, Anshuman Khandual wrote:
> This adds armpmu_sched_task(), as generic pmu's sched_task() override which
> in turn can utilize a new arm_pmu.sched_task() callback when available from
> the arm_pmu instance. This new callback will be used while enabling BRBE in
> ARMV8 PMU.
> 
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Tested-by: James Clark <james.clark@xxxxxxx>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>

Acked-by: Mark Rutland <mark.rutland@xxxxxxx>

> ---
>  drivers/perf/arm_pmu.c       | 9 +++++++++
>  include/linux/perf/arm_pmu.h | 1 +
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
> index 15bd1e34a88e..aada47e3b126 100644
> --- a/drivers/perf/arm_pmu.c
> +++ b/drivers/perf/arm_pmu.c
> @@ -517,6 +517,14 @@ static int armpmu_event_init(struct perf_event *event)
>  	return __hw_perf_event_init(event);
>  }
>  
> +static void armpmu_sched_task(struct perf_event_pmu_context *pmu_ctx, bool sched_in)
> +{
> +	struct arm_pmu *armpmu = to_arm_pmu(pmu_ctx->pmu);
> +
> +	if (armpmu->sched_task)
> +		armpmu->sched_task(pmu_ctx, sched_in);
> +}
> +
>  static void armpmu_enable(struct pmu *pmu)
>  {
>  	struct arm_pmu *armpmu = to_arm_pmu(pmu);
> @@ -858,6 +866,7 @@ struct arm_pmu *armpmu_alloc(void)
>  	}
>  
>  	pmu->pmu = (struct pmu) {
> +		.sched_task	= armpmu_sched_task,
>  		.pmu_enable	= armpmu_enable,
>  		.pmu_disable	= armpmu_disable,
>  		.event_init	= armpmu_event_init,
> diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
> index 525b5d64e394..f7fbd162ca4c 100644
> --- a/include/linux/perf/arm_pmu.h
> +++ b/include/linux/perf/arm_pmu.h
> @@ -100,6 +100,7 @@ struct arm_pmu {
>  	void		(*stop)(struct arm_pmu *);
>  	void		(*reset)(void *);
>  	int		(*map_event)(struct perf_event *event);
> +	void		(*sched_task)(struct perf_event_pmu_context *pmu_ctx, bool sched_in);
>  	int		num_events;
>  	bool		secure_access; /* 32-bit ARM only */
>  #define ARMV8_PMUV3_MAX_COMMON_EVENTS		0x40
> -- 
> 2.25.1
>