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

From: Yun Wu (Abel)
Date: Tue Nov 18 2014 - 09:35:59 EST

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.


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