On 10 September 2015 at 15:52, Gerd Hoffmann kraxel@redhat.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