perf/arm_cspmu: Add callback to reset filter config

Implementer may need to reset a filter config when
stopping a counter, thus adding a callback for this.

Reviewed-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Besar Wicaksono <bwicaksono@nvidia.com>
Signed-off-by: Will Deacon <will@kernel.org>

Author: bwicaksononv

drivers/perf/arm_cspmu/arm_cspmu.c

@@ -815,6 +815,10 @@ static void arm_cspmu_stop(struct perf_event *event, int pmu_flags)
 		return;
 
 	arm_cspmu_disable_counter(cspmu, hwc->idx);
+
+	if (cspmu->impl.ops.reset_ev_filter)
+		cspmu->impl.ops.reset_ev_filter(cspmu, event);
+
 	arm_cspmu_event_update(event);
 
 	hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;

drivers/perf/arm_cspmu/arm_cspmu.h

@@ -152,11 +152,13 @@ struct arm_cspmu_impl_ops {
 	bool (*is_cycle_counter_event)(const struct perf_event *event);
 	/* Decode event type/id from configs */
 	u32 (*event_type)(const struct perf_event *event);
-	/* Set event filters */
+	/* Set/reset event filters */
 	void (*set_cc_filter)(struct arm_cspmu *cspmu,
 			      const struct perf_event *event);
 	void (*set_ev_filter)(struct arm_cspmu *cspmu,
 			      const struct perf_event *event);
+	void (*reset_ev_filter)(struct arm_cspmu *cspmu,
+				const struct perf_event *event);
 	/* Implementation specific event validation */
 	int (*validate_event)(struct arm_cspmu *cspmu,
 			      struct perf_event *event);