linux-kernel - [PATCH] irqchip/apple-aic: Only handle PMC interrupt as FIQ when configured to fire FIQ

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Message-ID: <20250117170227.45243-1-towinchenmi@gmail.com>
Date: Sat, 18 Jan 2025 01:02:27 +0800
From: Nick Chan <towinchenmi@...il.com>
To: Hector Martin <marcan@...can.st>,
	Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <maz@...nel.org>,
	asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Nick Chan <towinchenmi@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH] irqchip/apple-aic: Only handle PMC interrupt as FIQ when configured to fire FIQ

The CPU PMU in Apple SoCs can be configured to fire its interrupt in one
of several ways, and since Apple A11 one of the method is FIQ. Only handle
the PMC interrupt as a FIQ when the CPU PMU has been configured to fire
FIQs.

Cc: stable@...r.kernel.org
Fixes: c7708816c944 ("irqchip/apple-aic: Wire PMU interrupts")
Signed-off-by: Nick Chan <towinchenmi@...il.com>
---
 drivers/irqchip/irq-apple-aic.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-apple-aic.c b/drivers/irqchip/irq-apple-aic.c
index da5250f0155c..c3d435103d6d 100644
--- a/drivers/irqchip/irq-apple-aic.c
+++ b/drivers/irqchip/irq-apple-aic.c
@@ -577,7 +577,8 @@ static void __exception_irq_entry aic_handle_fiq(struct pt_regs *regs)
 						  AIC_FIQ_HWIRQ(AIC_TMR_EL02_VIRT));
 	}
 
-	if (read_sysreg_s(SYS_IMP_APL_PMCR0_EL1) & PMCR0_IACT) {
+	if (read_sysreg_s(SYS_IMP_APL_PMCR0_EL1) &
+	    (FIELD_PREP(PMCR0_IMODE, PMCR0_IMODE_FIQ) | PMCR0_IACT)) {
 		int irq;
 		if (cpumask_test_cpu(smp_processor_id(),
 				     &aic_irqc->fiq_aff[AIC_CPU_PMU_P]->aff))

base-commit: 40384c840ea1944d7c5a392e8975ed088ecf0b37
-- 
2.48.1