linux-kernel - [PATCH 08/25] perf: arm_pmu: Convert to new IRQ affinity retrieval API

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Message-Id: <20250908163127.2462948-9-maz@kernel.org>
Date: Mon,  8 Sep 2025 17:31:10 +0100
From: Marc Zyngier <maz@...nel.org>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-acpi@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Mark Rutland <mark.rutland@....com>,
	Will Deacon <will@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sven Peter <sven@...nel.org>,
	Janne Grunau <j@...nau.net>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	James Clark <james.clark@...aro.org>
Subject: [PATCH 08/25] perf: arm_pmu: Convert to new IRQ affinity retrieval API

Now that the relevant interrupt controllers are equipped with
a callback returning the affinity of per-CPU interrupts, switch
the OF side of the ARM PMU driver over to this new method.

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 drivers/perf/arm_pmu_platform.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/perf/arm_pmu_platform.c b/drivers/perf/arm_pmu_platform.c
index 118170a5cedef..9c0494d8a867a 100644
--- a/drivers/perf/arm_pmu_platform.c
+++ b/drivers/perf/arm_pmu_platform.c
@@ -42,14 +42,13 @@ static int probe_current_pmu(struct arm_pmu *pmu,
 	return ret;
 }
 
-static int pmu_parse_percpu_irq(struct arm_pmu *pmu, int irq)
+static int pmu_parse_percpu_irq(struct arm_pmu *pmu, int irq,
+				const struct cpumask *affinity)
 {
-	int cpu, ret;
 	struct pmu_hw_events __percpu *hw_events = pmu->hw_events;
+	int cpu;
 
-	ret = irq_get_percpu_devid_partition(irq, &pmu->supported_cpus);
-	if (ret)
-		return ret;
+	cpumask_copy(&pmu->supported_cpus, affinity);
 
 	for_each_cpu(cpu, &pmu->supported_cpus)
 		per_cpu(hw_events->irq, cpu) = irq;
@@ -115,9 +114,12 @@ static int pmu_parse_irqs(struct arm_pmu *pmu)
 	}
 
 	if (num_irqs == 1) {
-		int irq = platform_get_irq(pdev, 0);
+		const struct cpumask *affinity;
+		int irq;
+
+		irq = platform_get_irq_affinity(pdev, 0, &affinity);
 		if ((irq > 0) && irq_is_percpu_devid(irq))
-			return pmu_parse_percpu_irq(pmu, irq);
+			return pmu_parse_percpu_irq(pmu, irq, affinity);
 	}
 
 	if (nr_cpu_ids != 1 && !pmu_has_irq_affinity(dev->of_node))
-- 
2.39.2