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Subject[irqchip: irq/irqchip-fixes] irqchip/mips-gic: Don't touch vl_map if a local interrupt is not routable
The following commit has been merged into the irq/irqchip-fixes branch of irqchip:

Commit-ID: 2c6c9c049510163090b979ea5f92a68ae8d93c45
Gitweb: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/2c6c9c049510163090b979ea5f92a68ae8d93c45
Author: Jiaxun Yang <jiaxun.yang@flygoat.com>
AuthorDate: Mon, 24 Apr 2023 11:31:55 +01:00
Committer: Marc Zyngier <maz@kernel.org>
CommitterDate: Tue, 16 May 2023 10:59:28 +01:00

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@vger.kernel.org
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Tested-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230424103156.66753-2-jiaxun.yang@flygoat.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 046c355..b568d55 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)
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