This is a note to let you know that I've just added the patch titled
irqchip/mips-gic: Don't touch vl_map if a local interrupt is not routable
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
irqchip-mips-gic-don-t-touch-vl_map-if-a-local-inter.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 994edc5d6690bdf2ade16fd8d7622c9796e4127d
Author: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Date: Mon Apr 24 11:31:55 2023 +0100
irqchip/mips-gic: Don't touch vl_map if a local interrupt is not routable
[ Upstream commit 2c6c9c049510163090b979ea5f92a68ae8d93c45 ]
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@xxxxxxxxxxxxxxx
Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Reviewed-by: Serge Semin <fancer.lancer@xxxxxxxxx>
Tested-by: Serge Semin <fancer.lancer@xxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230424103156.66753-2-jiaxun.yang@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 0d4515257c59c..c654fe22fcf33 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)
