linux-kernel - [PATCH v2 4/5] perf: arm_cspmu: Support implementation specific event validation

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Message-Id: <20230601030144.3458136-5-ilkka@os.amperecomputing.com>
Date:   Wed, 31 May 2023 20:01:43 -0700
From:   Ilkka Koskinen <ilkka@...amperecomputing.com>
To:     Jonathan Corbet <corbet@....net>, Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Besar Wicaksono <bwicaksono@...dia.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Robin Murphy <robin.murphy@....com>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Ilkka Koskinen <ilkka@...amperecomputing.com>
Subject: [PATCH v2 4/5] perf: arm_cspmu: Support implementation specific event validation

Some platforms may use e.g. different filtering mechanism and, thus,
may need different way to validate the events.

Signed-off-by: Ilkka Koskinen <ilkka@...amperecomputing.com>
---
 drivers/perf/arm_cspmu/arm_cspmu.c | 4 ++++
 drivers/perf/arm_cspmu/arm_cspmu.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
index b4c4ef81c719..a26f484e06b1 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.c
+++ b/drivers/perf/arm_cspmu/arm_cspmu.c
@@ -593,6 +593,10 @@ 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 &&
+	    !cspmu->impl.ops.validate_event(cspmu, event))
+		return -EAGAIN;
+
 	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 4a29b921f7e8..0e5c316c96f9 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.h
+++ b/drivers/perf/arm_cspmu/arm_cspmu.h
@@ -106,6 +106,8 @@ struct arm_cspmu_impl_ops {
 	void (*set_ev_filter)(struct arm_cspmu *cspmu,
 			      struct hw_perf_event *hwc,
 			      u32 filter);
+	/* Implementation specific event validation */
+	bool (*validate_event)(struct arm_cspmu *cspmu, struct perf_event *new);
 	/* Hide/show unsupported events */
 	umode_t (*event_attr_is_visible)(struct kobject *kobj,
 					 struct attribute *attr, int unused);
-- 
2.40.1