281c041852eeda52d4faf5db720c99ce
author Chris Wilson <chris@chris-wilson.co.uk> 1234362407 +0000
committer Eric Anholt <eric@anholt.net> 1236792808 -0700

drm/i915: Protect active fences on i915

The i915 also uses the fence registers for GPU access to tiled buffers so
we cannot reallocate one whilst it is on the active list. By performing a
LRU scan of the fenced buffers we also avoid waiting the possibility of
waiting on a pinned, or otherwise unusable, buffer.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>