commit 8002db6336dd361fc13214e9515fe5d52ff294ee
author Dave Airlie <airlied@redhat.com> Tue Jul 23 14:16:42 2013 +1000
committer Dave Airlie <airlied@redhat.com> Wed Jul 24 11:58:10 2013 +1000
tree 67a6fad200b33eada21944d3e42911a32f523705
parent 4f49ec92be64ad1d96cf5d26fc8276f9849202a3

qxl: convert qxl driver to proper use for reservations

The recent addition of lockdep support to reservations and their subsequent
use by TTM showed up a number of potential problems with the way qxl was using
TTM objects.

a) it was allocating objects, and reserving them later without validating
underneath the reservation, which meant in extreme conditions the objects could
be evicted before the reservation ever used them.

b) it was reserving objects straight after allocating them, but with no
ability to back off should the reservations fail. It now allocates the necessary
objects then does a complete reservation pass on them to avoid deadlocks.

c) it had two lists per release tracking objects, unnecessary complicating
the reservation process.

This patch removes the dual object tracking, adds reservations ticket support
to the release and fence object handling. It then ports the internal fb
drawing code and the userspace facing ioctl to use the new interfaces properly,
along with cleanup up the error path handling in some codepaths.

Signed-off-by: Dave Airlie <airlied@redhat.com>