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

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Date:	Thu, 10 Sep 2015 15:33:15 +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 15:23, Gerd Hoffmann <kraxel@...hat.com> wrote:
> On Do, 2015-09-10 at 09:59 +0100, Emil Velikov wrote:
>> On 9 September 2015 at 12:42, Gerd Hoffmann <kraxel@...hat.com> wrote:
>> > From: Dave Airlie <airlied@...hat.com>
>> >
>> > Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
>> > ---
>> >  drivers/gpu/drm/virtio/virtgpu_drv.c | 2 +-
>> >  1 file changed, 1 insertion(+), 1 deletion(-)
>> >
>> > diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
>> > index 1245d09..e00298e 100644
>> > --- a/drivers/gpu/drm/virtio/virtgpu_drv.c
>> > +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
>> > @@ -113,7 +113,7 @@ static const struct file_operations virtio_gpu_driver_fops = {
>> >
>> >
>> >  static struct drm_driver driver = {
>> > -       .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
>> > +       .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_RENDER,
>>
>> I believe that this will only create the renderD# node. Shouldn't one
>> also tag the relevant ioctls with DRM_RENDER_ALLOW ?
>
> 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#.

So I'm suspecting that you're using card# node which would explain why
things work. Otherwise drm_ioctl_permit will bail out with -EACCESS.

Regards,
Emil
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