Re: [PATCH V14 14/15] irqchip / ACPI: Introduce ACPI_IRQ_MODEL_LPIC for LoongArch

[Jianmin Lv]

On 2022/7/7 下午8:59, Marc Zyngier wrote:
> On Sun, 03 Jul 2022 09:45:31 +0100,
> Jianmin Lv <lvjianmin@xxxxxxxxxxx> wrote:
> > For LoongArch, ACPI_IRQ_MODEL_LPIC is introduced, and then the
> > callback acpi_get_gsi_domain_id and acpi_gsi_to_irq_fallback are
> > implemented.
> >
> > The acpi_get_gsi_domain_id callback returns related fwnode handle
> > of irqdomain for different GSI range.
> >
> > The acpi_gsi_to_irq_fallback will create new mapping for gsi when
> > the mapping of it is not found.
> >
> > Signed-off-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
> > ---
> >   drivers/acpi/bus.c                  |  3 +++
> >   drivers/irqchip/irq-loongarch-cpu.c | 37 +++++++++++++++++++++++++++++++++++++
> >   include/linux/acpi.h                |  1 +
> >   3 files changed, 41 insertions(+)
> >
> > diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> > index 86fa61a..63fbf00 100644
> > --- a/drivers/acpi/bus.c
> > +++ b/drivers/acpi/bus.c
> > @@ -1145,6 +1145,9 @@ static int __init acpi_bus_init_irq(void)
> >   	case ACPI_IRQ_MODEL_PLATFORM:
> >   		message = "platform specific model";
> >   		break;
> > +	case ACPI_IRQ_MODEL_LPIC:
> > +		message = "LPIC";
> > +		break;
> >   	default:
> >   		pr_info("Unknown interrupt routing model\n");
> >   		return -ENODEV;
> > diff --git a/drivers/irqchip/irq-loongarch-cpu.c b/drivers/irqchip/irq-loongarch-cpu.c
> > index c2f7411..1b241d7 100644
> > --- a/drivers/irqchip/irq-loongarch-cpu.c
> > +++ b/drivers/irqchip/irq-loongarch-cpu.c
> > @@ -15,6 +15,41 @@
> >   
> >   static struct irq_domain *irq_domain;
> >   
> > +static int lpic_gsi_to_irq(u32 gsi)
> > +{
> > +	/* Only pch irqdomain transferring is required for LoongArch. */
> > +	if (gsi >= GSI_MIN_PCH_IRQ && gsi <= GSI_MAX_PCH_IRQ)
> > +		return acpi_register_gsi(NULL, gsi, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_HIGH);
> > +	return -1;
>
> The expected return value on failure is 0 (which indicates that no
> interrupt was mapped). Here, things will break as acpi_gsi_to_irq()
> stores the result as unsigned, and compares the result to 0.

Ok, thanks, I'll change the return value to 0 on failure and change 
return type to unsigned int.


> 	M.