[RFC v2 5/8] drm/fence: add in-fences support

[Gustavo Padovan]

2016-04-26 Ville Syrjälä <ville.syrjala at linux.intel.com>:

> On Mon, Apr 25, 2016 at 07:33:25PM -0300, Gustavo Padovan wrote:
> > From: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
> > 
> > There is now a new property called FENCE_FD attached to every plane
> > state that receives the sync_file fd from userspace via the atomic commit
> > IOCTL.
> 
> I still don't like this property abuse. Also with atomic, all passed
> fences must be waited upon before anything is done, so attaching them
> to planes seems like it might just give people the wrong idea.

I'm actually fine with this as property, but another solutions is use
an array of {plane, fence_fd} and extend drm_atomic_ioctl args just like
we have done for out fences. However the FENCE_FD property is easier to
handle in userspace than the array. Any other idea?

	Gustavo