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

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Date:	Tue, 4 Nov 2014 15:28:39 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
cc:	Marc Zyngier <marc.zyngier@....com>,
	Mark Rutland <mark.rutland@....com>, jason@...edaemon.net,
	Catalin.Marinas@....com, Will.Deacon@....com, liviu.dudau@....com,
	Harish.Kasiviswanathan@....com,
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [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
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