linux-kernel - Re: [PATCH 5/5] virtgpu: mark as a render gpu

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Date:	Thu, 10 Sep 2015 16:04:37 +0100
From:	Emil Velikov <emil.l.velikov@...il.com>
To:	Gerd Hoffmann <kraxel@...hat.com>
Cc:	ML dri-devel <dri-devel@...ts.freedesktop.org>,
	Dave Airlie <airlied@...hat.com>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:VIRTIO GPU DRIVER" 
	<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 5/5] virtgpu: mark as a render gpu

On 10 September 2015 at 15:52, Gerd Hoffmann <kraxel@...hat.com> wrote:
>   Hi,
>
>> > Dave?  Looking at the ioctls they are all fine for render nodes, there
>> > isn't anything modesetting related in the device-specific ioctls.
>> >
>> > Correct?
>> >
>> Unless I've overdone the coffee this time - modesetting is done via
>> the card# node, while render via either card# or renderD#.
>
> Exactly, thats why anything modesetting-related must be disabled for
> renderD#.  Looking at the virtio-gpu device-specific ioctls I don't
> think there is anything doing modesetting (which we would have to leave
> out), so we can apply DRM_RENDER_ALLOW everythere I think.  Or maybe
> there is a global switch to flip DRM_RENDER_ALLOW for the whole list ...
>
IMHO the idea of having a 'global' switch sounds quite good, yet there
isn't one atm :-( It will be quite useful as we get more render only
devices.
DRIVER_RENDER doesn't do that unfortunately (which I think was the
original assumption), it only instructs drm core to create the
renderD# device/node.

Hope this clears up any ambiguity from my earlier replies :-)
Emil
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