[irqchip: irq/irqchip-fixes] irqchip/mips-gic: Don't touch vl_map if a local interrupt is not routable

[irqchip-bot for Jiaxun Yang]

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@xxxxxxxxxxx>
AuthorDate:    Mon, 24 Apr 2023 11:31:55 +01:00
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
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@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
---
 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)