[PATCH v2 02/19] arm64: initial support for GICv3

[Marc Zyngier]

On 25/03/14 18:36, Z Lim wrote:
> 
> 
> 
> On Tue, Mar 25, 2014 at 3:13 AM, Marc Zyngier <marc.zyngier at arm.com
> <mailto:marc.zyngier at arm.com>> wrote:
> 
>     On Tue, Mar 25 2014 at  6:35:18 am GMT, Z Lim <zlim.lnx at gmail.com
>     <mailto:zlim.lnx at gmail.com>> wrote:
> 
>     Hi Zi,
> 
>     > I see this warning :(
>     > You can trigger it when a device's INT# falls within [gic_irqs-16,
>     gic_irqs),
>     > which lines up with the -16 above.
>     >
>     >     irq_create_of_mapping  // SPI# from DT
>     >
>     >         domain->ops->xlate (gic_irq_domain_xlate)  // SPI# + 32 =
>     INT# = hwirq
>     >
>     >         irq_create_mapping  // uses hwirq = INT#
>     >
>     >             irq_domain_associate  // uses hwirq = INT#
>     >
>     >                 if (WARN(hwirq >= domain->hwirq_max, "error: hwirq
>     0x%x is too
>     >                 large for %s\n", (int)hwirq, domain->name))  //
>     hwirq_max was
>     >                 set to (MAX_INT# - 16) above, uh oh...
> 
>     I'm about to push out the following fix. Can you give it a go and let me
>     know if that works for you?
> 
>     Thanks,
> 
>             M.
> 
>     diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
>     index 60ef92d..b90ea2c 100644
>     --- a/drivers/irqchip/irq-gic-v3.c
>     +++ b/drivers/irqchip/irq-gic-v3.c
>     @@ -552,6 +552,8 @@ static struct irq_chip gic_chip = {
>      static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
>                                     irq_hw_number_t hw)
>      {
>     +       if (hw < 16)            /* SGIs are private to the core
>     kernel */
>     +               return -EPERM;
>             if (hw < 32) {
>                     irq_set_percpu_devid(irq);
>                     irq_set_chip_and_handler(irq, &gic_chip,
>     @@ -642,7 +644,7 @@ static int __init gic_of_init(struct device_node
>     *node, struct device_node *pare
>                     gic_irqs = 1020;
>             gic_data.irq_nr = gic_irqs;
> 
>     -       gic_data.domain = irq_domain_add_linear(node, gic_irqs - 16,
>     +       gic_data.domain = irq_domain_add_linear(node, gic_irqs,
>                                                     &gic_irq_domain_ops,
>     &gic_data);
>             gic_data.rdist.rdist =
>     alloc_percpu(typeof(*gic_data.rdist.rdist));
> 
> 
> 
> LGTM. Also tested on model.
> 
> Reviewed-by: Zi Shen Lim <zlim at broadcom.com <mailto:zlim at broadcom.com>>

Excellent. Thanks for testing!

	M.
-- 
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