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

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Message-ID: <CAKMK7uFUNT193f5djZD6T8cgRxxnZL73yrqbupPHOd2P-+Y=pQ@mail.gmail.com>
Date:	Wed, 25 May 2016 18:40:24 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Gerd Hoffmann <kraxel@...hat.com>, 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.

On Mon, Mar 30, 2015 at 4:49 PM, Daniel Vetter <daniel@...ll.ch> wrote:
> On Mon, Mar 30, 2015 at 02:23:47PM +0200, Gerd Hoffmann wrote:
>> > > Signed-off-by: Dave Airlie <airlied@...hat.com>
>> > > Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
>> >
>> > Standard request from my side for new drm drivers (especially if they're
>> > this simple): Can you please update the drivers to latest drm internal
>> > interfaces, i.e. using universal planes and atomic?
>>
>> Up'n'running.  Incremental patch:
>>
>> https://www.kraxel.org/cgit/linux/commit/?h=virtio-gpu-2d&id=b8edf4f38a1ec5a50f6ac8948521a12f862d3d5a
>>
>> v2 coming, but I'll go over the other reviews first.
>
> Looking good. Wrt pageflip the current MO is to handroll it in your
> driver, common approach is to use the msm async commit implementation
> msm_atomic_commit. The issue is simply that right now there's still no
> useable generic vblank callback support (drm_irq.c is a mess) hence why
> the core helpers don't support async flips yet.

I guess I didn't do a good job at looking at your v2: Cursor is still
using legacy interfaces and not a proper plane. Would be awesome if
you could fix that up. Atomic drivers really shouldn't use the legacy
cursor interfaces any more at all.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch