[V10 PATCH 2/2] irqchip: gicv2m: Add supports for ARM GICv2m MSI(-X)

On Tue, 4 Nov 2014, Suravee Suthikulpanit wrote:

And that's what I am trying to do here except that GIC is expecting that
information to be passed to it via irq_domain_alloc_irqs(..., args) where args
is struct of_phandle_args (e.g. in the kernel/irqdomain.c:
irq_create_of_mapping). This works fine when specifying interrupt from DT, but
that is not always the case.

Currently, I can just create a fake of_phandle_args just to pass the hwirq
information to GIC.

    --> gicv2m_setup_msi_irq()
     |    struct of_phandle_args phan;
     |    phan.np = NULL;
     |    phan.args_count = 3;
     |    phan.args[0] = 0;
     |    phan.args[1] = hwirq - 32;
     |    phan.args[2] = IRQ_TYPE_EDGE_RISING;
     |--> irq_domain_alloc_irqs(d, 1, NUMA_NO_NODE, &phan);
      |--> gicv2m_domain_alloc(d, virq, nr_irqs, arg)
	|--> irq_domain_alloc_irqs_parent(d, virq, nr_irqs, arg);

I am trying to figure out what would be a common data structure for this
purpose that would work for both Dt and non-DT case (e.g. GICv2m MSI). Unless
you think this is ok.

You need to sort that out with Marc. It needs to be done in a way
which is usable for the other potential use cases of stacked domains
on top of GIC.

Thanks,

	tglx