linux-kernel - Re: [PATCH v6 3/4] perf: arm_cspmu: Support implementation specific validation

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Date:   Wed, 16 Aug 2023 15:05:15 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Ilkka Koskinen <ilkka@...amperecomputing.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Besar Wicaksono <bwicaksono@...dia.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Corbet <corbet@....net>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v6 3/4] perf: arm_cspmu: Support implementation specific
 validation

On 15/08/2023 07:35, Ilkka Koskinen wrote:
> Some platforms may use e.g. different filtering mechanism and, thus,
> may need different way to validate the events and group.
> 
> Signed-off-by: Ilkka Koskinen <ilkka@...amperecomputing.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>


> ---
>   drivers/perf/arm_cspmu/arm_cspmu.c | 8 +++++++-
>   drivers/perf/arm_cspmu/arm_cspmu.h | 3 +++
>   2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
> index 94f6856ec786..585ce96ac03f 100644
> --- a/drivers/perf/arm_cspmu/arm_cspmu.c
> +++ b/drivers/perf/arm_cspmu/arm_cspmu.c
> @@ -572,7 +572,7 @@ static void arm_cspmu_disable(struct pmu *pmu)
>   static int arm_cspmu_get_event_idx(struct arm_cspmu_hw_events *hw_events,
>   				struct perf_event *event)
>   {
> -	int idx;
> +	int idx, ret;
>   	struct arm_cspmu *cspmu = to_arm_cspmu(event->pmu);
>   
>   	if (supports_cycle_counter(cspmu)) {
> @@ -606,6 +606,12 @@ static int arm_cspmu_get_event_idx(struct arm_cspmu_hw_events *hw_events,
>   	if (idx >= cspmu->num_logical_ctrs)
>   		return -EAGAIN;
>   
> +	if (cspmu->impl.ops.validate_event) {
> +		ret = cspmu->impl.ops.validate_event(cspmu, event);
> +		if (ret)
> +			return ret;
> +	}
> +
>   	set_bit(idx, hw_events->used_ctrs);
>   
>   	return idx;
> diff --git a/drivers/perf/arm_cspmu/arm_cspmu.h b/drivers/perf/arm_cspmu/arm_cspmu.h
> index 274ca3d10578..05577f74b8a0 100644
> --- a/drivers/perf/arm_cspmu/arm_cspmu.h
> +++ b/drivers/perf/arm_cspmu/arm_cspmu.h
> @@ -107,6 +107,9 @@ struct arm_cspmu_impl_ops {
>   	/* Set event filter */
>   	void (*set_ev_filter)(struct arm_cspmu *cspmu,
>   			      struct hw_perf_event *hwc, u32 filter);
> +	/* Implementation specific event validation */
> +	int (*validate_event)(struct arm_cspmu *cspmu,
> +			      struct perf_event *event);
>   	/* Hide/show unsupported events */
>   	umode_t (*event_attr_is_visible)(struct kobject *kobj,
>   					 struct attribute *attr, int unused);