linux-kernel - Re: [PATCH] Add virtio gpu driver.

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Message-ID: <CAPj87rN4pXHukDRD-e=ZrO1hcts04cSz1Hr9TNAgicGVWE5_-Q@mail.gmail.com>
Date:	Tue, 24 Mar 2015 22:50:28 +0000
From:	Daniel Stone <daniel@...ishbar.org>
To:	Gerd Hoffmann <kraxel@...hat.com>
Cc:	virtio-dev@...ts.oasis-open.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	"open list:ABI/API" <linux-api@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
	"open list:VIRTIO CORE, NET..." 
	<virtualization@...ts.linux-foundation.org>,
	Dave Airlie <airlied@...hat.com>
Subject: Re: [PATCH] Add virtio gpu driver.

Hi,

On 24 March 2015 at 16:07, Gerd Hoffmann <kraxel@...hat.com> wrote:
> +static int virtio_gpu_crtc_page_flip(struct drm_crtc *crtc,
> +                                    struct drm_framebuffer *fb,
> +                                    struct drm_pending_vblank_event *event,
> +                                    uint32_t flags)
> +{
> +       return -EINVAL;
> +}

I'm not going to lie, I was really hoping the 5th (?) GPU option for
Qemu would support pageflipping. Daniel's comment about conversion to
atomic is relevant, but: do you have a mechanism which allows you to
post updates (e.g. 'start displaying this buffer now please') that
allows you to get events back when they have actually been displayed?

Cheers,
Daniel
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