Hello Jiaxun
On Mon, Apr 24, 2023 at 11:31:55AM +0100, Jiaxun Yang wrote:
> 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
s/intetrupt/interrupt
> 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>
My system doesn't have VPEs but 2x MIPS32 P5600 cores with GIC enabled as
EIC device so I can't fully test this change, but at the very least it
looks reasonable. Indeed performing the local IRQs routing setups for
the non-routable IRQs looks invalid. A similar change can be spotted
in the gic_irq_domain_map() method implementation.
> ---
> 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;
Please add newline here to distinguish the skip-step code chunk and
the setup code so the look would look a tiny bit more readable.
> cd = &gic_all_vpes_chip_data[intr];
> write_gic_vl_map(mips_gic_vx_map_reg(intr), cd->map);
> if (cd->mask)
Other than that the change looks good. Thanks.
Reviewed-by: Serge Semin <fancer.lancer@xxxxxxxxx>
-Serge(y)
> --
> 2.34.1
>
