[PATCH v3 3/8] VFIO: platform: forwarded state tested when selecting IRQ handler

Eric Auger
2014-12-01T21:15:13Z

On 12/01/2014 09:10 PM, Christoffer Dall wrote:
> On Mon, Dec 01, 2014 at 03:39:24PM +0100, Eric Auger wrote:
>> Hi Christoffer,
>> On 11/30/2014 01:47 PM, Christoffer Dall wrote:
>>> The subject reads strangely, perhaps just:
>>>
>>> VFIO: platform: test forward state when selecting IRQ handler
>> OK
>>>
>>> On Sun, Nov 23, 2014 at 07:35:55PM +0100, Eric Auger wrote:
>>>> In case the IRQ is forwarded, the VFIO platform IRQ handler does not
>>>> need to disable the IRQ anymore.
>>>>
>>>> When setting the IRQ handler we now also test the forwarded state. In
>>>> case the IRQ is forwarded we select the edge handler (no automaske).
>>>>
>>>> Signed-off-by: Eric Auger <eric.auger@linaro.org>
>>>>
>>>> ---
>>>>
>>>> v2 -> v3:
>>>> - forwarded state was tested in the handler. Now the forwarded state
>>>> is tested before setting the handler. This definitively limits
>>>> the dynamics of forwarded state changes but I don't think there is
>>>> a use case where we need to be able to change the state at any time.
>>>
>>> user space can change this by calling the VFIO_IRQ_SET_ACTION_TRIGGER
>>> whenever it wants, right?
>> yes the user can set/unset the VFIO signaling (and request_irq/free_irq)
>> using VFIO_IRQ_SET_ACTION_TRIGGER. In this new version I do not allow
>> changing the forwarded state when the handler is attached (request_irq).
>>
>> Does it answer your interrogation?
>>
> interrogation? hopefully it wasn't that bad ;)
Oups sorry "faux ami" in french. I wanted to say question but wanted to
say it smarter. another time ;-)
>
> Yes, that answers my question.
>
> Thanks,
> -Christoffer
>