linux-kernel - [PATCH 1/2] irqchip/mips-gic: Don't touch vl_map if a local interrupt is not routable

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Message-Id: <20230424103156.66753-2-jiaxun.yang@flygoat.com>
Date:   Mon, 24 Apr 2023 11:31:55 +0100
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     maz@...nel.org
Cc:     tsbogend@...ha.franken.de, fancer.lancer@...il.com,
        tglx@...utronix.de, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jiaxun Yang <jiaxun.yang@...goat.com>, stable@...r.kernel.org
Subject: [PATCH 1/2] irqchip/mips-gic: Don't touch vl_map if a local interrupt is not routable

When a GIC local interrupt is not routable, it's vl_map will be used
to control some internal states for core (providing IPTI, IPPCI, IPFDC
input signal for core). Overriding it will interfere core's intetrupt
controller.

Do not touch vl_map if a local interrupt is not routable, we are not
going to remap it.

Before dd098a0e0319 (" irqchip/mips-gic: Get rid of the reliance on
irq_cpu_online()"), if a local interrupt is not routable, then it won't
be requested from GIC Local domain, and thus gic_all_vpes_irq_cpu_online
won't be called for that particular interrupt.

Fixes: dd098a0e0319 (" irqchip/mips-gic: Get rid of the reliance on irq_cpu_online()")
Cc: stable@...r.kernel.org
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 drivers/irqchip/irq-mips-gic.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 046c355e120b..b568d55ef7c5 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -399,6 +399,8 @@ static void gic_all_vpes_irq_cpu_online(void)
 		unsigned int intr = local_intrs[i];
 		struct gic_all_vpes_chip_data *cd;

+		if (!gic_local_irq_is_routable(intr))
+			continue;
 		cd = &gic_all_vpes_chip_data[intr];
 		write_gic_vl_map(mips_gic_vx_map_reg(intr), cd->map);
 		if (cd->mask)
-- 
2.34.1