Re: [virtio-dev] Re: [PATCH V5 2/2] virtio-gpio: Add support for interrupts

[Viresh Kumar <viresh.kumar@linaro.org>]

On 20-07-21, 09:01, Arnd Bergmann wrote:
> That's what I was hoping for, I'm just not sure if this is required
> by the virtio spec or just the usual implementation of the device
> side. Have you found a section in the spec that guarantees that
> the virtqueue_kick() serves as a sufficient barrier that the driver
> can rely on the information having arrived?

This is what the spec say about it:

https://docs.oasis-open.org/virtio/virtio/v1.1/csprd01/virtio-v1.1-csprd01.html#x1-9000023

> Ok, in that case I guess the requeue has to be deferred, which may
> rule out everything other than the fasteoi method.

True.

> I meant the notification from device to driver that an event has
> happened.

Yeah, I understood it later.

-- 
viresh