Re: [patch 08/16] genirq: Introduce callback irq_chip.irq_write_msi_msg

From: Jiang Liu
Date: Tue Nov 18 2014 - 09:52:57 EST

On 2014/11/18 22:34, Yun Wu (Abel) wrote:
> On 2014/11/18 22:19, Thomas Gleixner wrote:
>> On Tue, 18 Nov 2014, Yun Wu (Abel) wrote:
>>> On 2014/11/18 21:43, Jiang Liu wrote:
>>>> We provide an irq_chip for each type of interrupt controller
>>>> instead of devices. For the example mentioned above, if device A
>>>> and Group B has different interrupt controllers, we just need to
>>>> implement irq_chip_A and irq_chip_B and set irq_chip.irq_write_msi_msg()
>>>> to suitable callbacks.
>>>> The framework already achieves what you you want:)
>>> What if device A and group B have the same interrupt controller?
>> Well, if write_msg() is different they are hardly the same.
> The GICv3 ITS now deals with both PCI and non PCI message interrupts.
> We can't require the new devices behave writing message in a same way.
> What we can do is to abstract all the endpoints' behavior, and I
> provided one abstraction in an earlier reply.
It should be easy to extend:)
Actually, x86 interrupt remapping drivers already support two types of
MSIs, one is PCI MSI/MSIX, another is HPET interrupt.
> Thanks,
> Abel
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