linux-kernel - [PATCH 3/8] irqchip/apple-aic: Add cpumasks for E and P cores

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Date:   Sat, 13 Nov 2021 11:54:24 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Mark Rutland <mark.rutland@....com>, Will Deacon <will@...nel.org>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 3/8] irqchip/apple-aic: Add cpumasks for E and P cores

In order to be able to tell the core IRQ code about the affinity
of the PMU interrupt in later patches, compute the cpumasks of the
P and E cores at boot time.

This relies on the affinity scheme used by the vendor, which seems
to work for the couple of SoCs that are out in the wild.

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 drivers/irqchip/irq-apple-aic.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/irqchip/irq-apple-aic.c b/drivers/irqchip/irq-apple-aic.c
index 3759dc36cc8f..30ca80ccda8b 100644
--- a/drivers/irqchip/irq-apple-aic.c
+++ b/drivers/irqchip/irq-apple-aic.c
@@ -177,6 +177,8 @@ struct aic_irq_chip {
 	void __iomem *base;
 	struct irq_domain *hw_domain;
 	struct irq_domain *ipi_domain;
+	struct cpumask ecore_mask;
+	struct cpumask pcore_mask;
 	int nr_hw;
 	int ipi_hwirq;
 };
@@ -200,6 +202,11 @@ static void aic_ic_write(struct aic_irq_chip *ic, u32 reg, u32 val)
 	writel_relaxed(val, ic->base + reg);
 }
 
+static bool __is_pcore(u64 mpidr)
+{
+	return MPIDR_AFFINITY_LEVEL(mpidr, 2) == 1;
+}
+
 /*
  * IRQ irqchip
  */
@@ -833,6 +840,13 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p
 		return -ENODEV;
 	}
 
+	for_each_possible_cpu(i) {
+		if (__is_pcore(cpu_logical_map(i)))
+			cpumask_set_cpu(i, &irqc->pcore_mask);
+		else
+			cpumask_set_cpu(i, &irqc->ecore_mask);
+	}
+
 	set_handle_irq(aic_handle_irq);
 	set_handle_fiq(aic_handle_fiq);
 
-- 
2.30.2