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@arm.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);
 }
 EXPORT_SYMBOL_GPL(arm_cspmu_sysfs_event_show);
 
-- 
2.39.2.101.g768bb238c484.dirty

On Thu, 1 Jun 2023, 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@arm.com>

Reviewed-and-tested-by: Ilkka Koskinen <ilkka@os.amperecomputing.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);
> }
> EXPORT_SYMBOL_GPL(arm_cspmu_sysfs_event_show);
>
> -- 
> 2.39.2.101.g768bb238c484.dirty
>
>

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@arm.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@arm.com>