linux-kernel - [PATCH v6 2/4] perf: arm_cspmu: Support implementation specific filters

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Date:   Mon, 14 Aug 2023 23:35:24 -0700
From:   Ilkka Koskinen <ilkka@...amperecomputing.com>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Besar Wicaksono <bwicaksono@...dia.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Corbet <corbet@....net>
Cc:     Ilkka Koskinen <ilkka@...amperecomputing.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: [PATCH v6 2/4] perf: arm_cspmu: Support implementation specific filters

ARM Coresight PMU architecture specification [1] defines PMEVTYPER and
PMEVFILT* registers as optional in Chapter 2.1. Moreover, implementers may
choose to use PMIMPDEF* registers (offset: 0xD80-> 0xDFF) to filter the
events. Add support for those by adding implementation specific filter
callback function.

[1] https://developer.arm.com/documentation/ihi0091/latest

Signed-off-by: Ilkka Koskinen <ilkka@...amperecomputing.com>
Reviewed-by: Besar Wicaksono <bwicaksono@...dia.com>
---
 drivers/perf/arm_cspmu/arm_cspmu.c | 12 ++++++++----
 drivers/perf/arm_cspmu/arm_cspmu.h |  3 +++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
index 6387cbad7a7d..94f6856ec786 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.c
+++ b/drivers/perf/arm_cspmu/arm_cspmu.c
@@ -116,6 +116,9 @@ static unsigned long arm_cspmu_cpuhp_state;
 
 static DEFINE_MUTEX(arm_cspmu_lock);
 
+static void arm_cspmu_set_ev_filter(struct arm_cspmu *cspmu,
+				    struct hw_perf_event *hwc, u32 filter);
+
 static struct acpi_apmt_node *arm_cspmu_apmt_node(struct device *dev)
 {
 	return *(struct acpi_apmt_node **)dev_get_platdata(dev);
@@ -450,6 +453,7 @@ static int arm_cspmu_init_impl_ops(struct arm_cspmu *cspmu)
 	CHECK_DEFAULT_IMPL_OPS(impl_ops, event_type);
 	CHECK_DEFAULT_IMPL_OPS(impl_ops, event_filter);
 	CHECK_DEFAULT_IMPL_OPS(impl_ops, event_attr_is_visible);
+	CHECK_DEFAULT_IMPL_OPS(impl_ops, set_ev_filter);
 
 	return 0;
 }
@@ -811,9 +815,9 @@ static inline void arm_cspmu_set_event(struct arm_cspmu *cspmu,
 	writel(hwc->config, cspmu->base0 + offset);
 }
 
-static inline void arm_cspmu_set_ev_filter(struct arm_cspmu *cspmu,
-					   struct hw_perf_event *hwc,
-					   u32 filter)
+static void arm_cspmu_set_ev_filter(struct arm_cspmu *cspmu,
+					struct hw_perf_event *hwc,
+					u32 filter)
 {
 	u32 offset = PMEVFILTR + (4 * hwc->idx);
 
@@ -845,7 +849,7 @@ static void arm_cspmu_start(struct perf_event *event, int pmu_flags)
 		arm_cspmu_set_cc_filter(cspmu, filter);
 	} else {
 		arm_cspmu_set_event(cspmu, hwc);
-		arm_cspmu_set_ev_filter(cspmu, hwc, filter);
+		cspmu->impl.ops.set_ev_filter(cspmu, hwc, filter);
 	}
 
 	hwc->state = 0;
diff --git a/drivers/perf/arm_cspmu/arm_cspmu.h b/drivers/perf/arm_cspmu/arm_cspmu.h
index e5c6dff2ce7f..274ca3d10578 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.h
+++ b/drivers/perf/arm_cspmu/arm_cspmu.h
@@ -104,6 +104,9 @@ struct arm_cspmu_impl_ops {
 	u32 (*event_type)(const struct perf_event *event);
 	/* Decode filter value from configs */
 	u32 (*event_filter)(const struct perf_event *event);
+	/* Set event filter */
+	void (*set_ev_filter)(struct arm_cspmu *cspmu,
+			      struct hw_perf_event *hwc, u32 filter);
 	/* Hide/show unsupported events */
 	umode_t (*event_attr_is_visible)(struct kobject *kobj,
 					 struct attribute *attr, int unused);
-- 
2.41.0