linux-kernel - [PATCH] irqchip/apple-aic: Correctly map the vgic maintenance interrupt

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Date:   Wed,  1 Feb 2023 16:40:56 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc:     Hector Martin <marcan@...can.st>,
        Oliver Upton <oliver.upton@...ux.dev>
Subject: [PATCH] irqchip/apple-aic: Correctly map the vgic maintenance interrupt

We currently allocate the vgic maintenance interrupt by calling into
the low-level irqdomain code. Not only this is unnecessary, but this
is also pretty wrong: we end-up skipping a bunch of irqdesc state
setup

A simple "cat /proc/interrupt" shows how wrong we are, as the
interrupt appears as "Edge" instead of "Level".

Instead, just call the standard irq_create_fwspec_mapping(), which
is the right tool for the job. Duh.

Signed-off-by: Marc Zyngier <maz@...nel.org>
---

Notes:
    This applies to Oliver's kvm-arm64/apple-vgic-mi branch.

 drivers/irqchip/irq-apple-aic.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-apple-aic.c b/drivers/irqchip/irq-apple-aic.c
index 09fd52d91e45..76ee7c5e7b7e 100644
--- a/drivers/irqchip/irq-apple-aic.c
+++ b/drivers/irqchip/irq-apple-aic.c
@@ -1201,9 +1201,7 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p
 			},
 		};
 
-		vgic_info.maint_irq = irq_domain_alloc_irqs(irqc->hw_domain,
-							    1, NUMA_NO_NODE,
-							    &mi);
+		vgic_info.maint_irq = irq_create_fwspec_mapping(&mi);
 		WARN_ON(!vgic_info.maint_irq);
 	}
 
-- 
2.34.1