linux-kernel - [PATCH 2/5] perf/arm_cspmu: Add callback to reset filter config

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Message-ID: <20250812233411.1694012-3-bwicaksono@nvidia.com>
Date: Tue, 12 Aug 2025 23:34:08 +0000
From: Besar Wicaksono <bwicaksono@...dia.com>
To: <will@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>, <suzuki.poulose@....com>,
	<robin.murphy@....com>, <ilkka@...amperecomputing.com>,
	<mark.rutland@....com>, <treding@...dia.com>, <jonathanh@...dia.com>,
	<vsethi@...dia.com>, <rwiley@...dia.com>, <sdonthineni@...dia.com>, "Besar
 Wicaksono" <bwicaksono@...dia.com>
Subject: [PATCH 2/5] 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.

Signed-off-by: Besar Wicaksono <bwicaksono@...dia.com>
---
 drivers/perf/arm_cspmu/arm_cspmu.c | 4 ++++
 drivers/perf/arm_cspmu/arm_cspmu.h | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
index e4b98cfa606c..595e4bdd0b4b 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.c
+++ b/drivers/perf/arm_cspmu/arm_cspmu.c
@@ -816,6 +816,10 @@ 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;
diff --git a/drivers/perf/arm_cspmu/arm_cspmu.h b/drivers/perf/arm_cspmu/arm_cspmu.h
index 36c1dcce33d6..e3a4dd068805 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.h
+++ b/drivers/perf/arm_cspmu/arm_cspmu.h
@@ -153,11 +153,13 @@ 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);
-- 
2.47.0