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

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Message-ID: <CACvgo53ADmgiSHaHiUdwtO50un0exKXiaqkjScmp0VhmCCXEbA@mail.gmail.com>
Date:	Wed, 25 May 2016 17:44:55 +0100
From:	Emil Velikov <emil.l.velikov@...il.com>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	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 25 May 2016 at 17:40, Daniel Vetter <daniel@...ll.ch> wrote:
> 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.

Wild idea:
Worth adding if (drm_core_check_feature(dev, DRIVER_ATOMIC)  {
printf("abort abort"); return; }
style of checks for the legacy (preatomic) kms helpers ?

Or does it feel like an overkill ?

-Emil