linux-kernel - Re: [PATCH 1/4] perf/arm_cspmu: Fix event attribute type

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Date:   Fri, 2 Jun 2023 11:25:42 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Robin Murphy <robin.murphy@....com>, will@...nel.org
Cc:     mark.rutland@....com, bwicaksono@...dia.com,
        ilkka@...amperecomputing.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] perf/arm_cspmu: Fix event attribute type

On 01/06/2023 12:59, Robin Murphy wrote:
> ARM_CSPMU_EVENT_ATTR() defines a struct perf_pmu_events_attr, so
> arm_cspmu_sysfs_event_show() should not be interpreting it as struct
> dev_ext_attribute.
> 
> Fixes: e37dfd65731d ("perf: arm_cspmu: Add support for ARM CoreSight PMU driver")
> Signed-off-by: Robin Murphy <robin.murphy@....com>
> ---
>   drivers/perf/arm_cspmu/arm_cspmu.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
> index a3f1c410b417..72dc7a9e1ca8 100644
> --- a/drivers/perf/arm_cspmu/arm_cspmu.c
> +++ b/drivers/perf/arm_cspmu/arm_cspmu.c
> @@ -189,10 +189,10 @@ static inline bool use_64b_counter_reg(const struct arm_cspmu *cspmu)
>   ssize_t arm_cspmu_sysfs_event_show(struct device *dev,
>   				struct device_attribute *attr, char *buf)
>   {
> -	struct dev_ext_attribute *eattr =
> -		container_of(attr, struct dev_ext_attribute, attr);
> -	return sysfs_emit(buf, "event=0x%llx\n",
> -			  (unsigned long long)eattr->var);
> +	struct perf_pmu_events_attr *pmu_attr;
> +
> +	pmu_attr = container_of(attr, typeof(*pmu_attr), attr);
> +	return sysfs_emit(buf, "event=0x%llx\n", pmu_attr->id);
>   }

Thanks for catching this !  The other option would be to, which was
the original intention.

diff --git a/drivers/perf/arm_cspmu/arm_cspmu.h 
b/drivers/perf/arm_cspmu/arm_cspmu.h
index 51323b175a4a..b5e454be95b3 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.h
+++ b/drivers/perf/arm_cspmu/arm_cspmu.h
@@ -32,7 +32,7 @@
         ARM_CSPMU_EXT_ATTR(_name, arm_cspmu_sysfs_format_show, (char 
*)_config)

  #define ARM_CSPMU_EVENT_ATTR(_name, _config)			                   \
-       PMU_EVENT_ATTR_ID(_name, arm_cspmu_sysfs_event_show, _config)
+       ARM_CSPMU_EXT_ATTR(_name, arm_cspmu_sysfs_event_show, 
(void*)(unsigned long)_config)


  /* Default event id mask */

Either way,

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