Hi Thomas,
Thanks a lot for reviewing this.
On Thursday 24 October 2013 02:42 PM, Thomas Gleixner wrote:
> On Mon, 30 Sep 2013, Sricharan R wrote:
>> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
>> index 1760ceb..c5778ab 100644
>> --- a/drivers/irqchip/irq-gic.c
>> +++ b/drivers/irqchip/irq-gic.c
>> @@ -72,6 +72,8 @@ struct gic_chip_data {
>>
>> static DEFINE_RAW_SPINLOCK(irq_controller_lock);
>>
>> +const struct irq_domain_ops *gic_routable_irq_domain_ops;
>> +
>> /*
>> * The GIC mapping of CPU interfaces does not necessarily match
>> * the logical CPU numbering. Let's use a mapping as returned
>> @@ -675,11 +677,26 @@ static int gic_irq_domain_map(struct irq_domain *d,
>> unsigned int irq,
>> irq_set_chip_and_handler(irq, &gic_chip,
>> handle_fasteoi_irq);
>> set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
>> +
>> + if (gic_routable_irq_domain_ops &&
>> + gic_routable_irq_domain_ops->map)
>> + gic_routable_irq_domain_ops->map(d, irq, hw);
> Shudder. Why are you sprinkling these if (ops && ops->fun)
> conditionals all over the place instead of having a default ops
> implementation which handles the non crossbar case by proper empty
> functions. That code is not on a hot path so it does not matter at
> all.
>
Ok, Understand. Will add default ops to avoid these checks.
>> }
>> irq_set_chip_data(irq, d->host_data);
>> return 0;
>> }
>>
>> +static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
>> +{
>> + irq_hw_number_t hw = irq_get_irq_data(irq)->hwirq;
>> +
>> + if (hw > 32) {
> Groan. This wants to be in the ops->unmap function. It's not related
> to the GIC core code.
Ok, will move this to unmap ops of the crossbar.
>> + if (gic_routable_irq_domain_ops &&
>> + gic_routable_irq_domain_ops->unmap)
>> + gic_routable_irq_domain_ops->unmap(d, irq);
>> + }
>> +}
>> +
>> static int gic_irq_domain_xlate(struct irq_domain *d,
>> struct device_node *controller,
>> const u32 *intspec, unsigned int intsize,
>> @@ -694,8 +711,15 @@ static int gic_irq_domain_xlate(struct irq_domain *d,
>> *out_hwirq = intspec[1] + 16;
>>
>> /* For SPIs, we need to add 16 more to get the GIC irq ID number */
>> - if (!intspec[0])
>> - *out_hwirq += 16;
>> + if (!intspec[0]) {
>> + if (gic_routable_irq_domain_ops &&
>> + gic_routable_irq_domain_ops->xlate)
>> + *out_hwirq = gic_routable_irq_domain_ops->xlate(d,
>> + controller, intspec, intsize,
>> + out_hwirq, out_type);
>> + else
>> + *out_hwirq += 16;
>> + }
> So if you have a default xlate ops implementation then this boils down to
>
> if (!intspec[0])
> *out_hwirq = routing_ops->xlate()
>
> And the default (non crossbar) implementation would be:
>
> return *out_hwirq + 16;
>
Ok. This is better. Will change here.
Regards,
Sricharan
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