tree 0b087388f9fd5ba506c1d985f53dd820ff73583a
parent 8b0e378a20e48c691d374f39d8b0596e63598cfc
author Eric Anholt <eric@anholt.net> 1235084091 -0800
committer Dave Airlie <airlied@redhat.com> 1235347579 +1000

drm/i915: Don't let a device flush to prepare buffers clear new write_domains.

The problem was that object_set_to_gpu_domain would set the new write_domains
that are getting set by this batchbuffer, then the accumulated flushes required
for all the objects in preparation for this batchbuffer were posted, and the
brand new write domain would get cleared by the flush being posted.  Instead,
hang on to the new (or old if we're not changing it) value and set it after
the flush is queued.

Results from this noticably included conformance test failures from reads
shortly after writes (where the new write domain had been lost and thus not
flushed and waited on), but is a suspected cause of hangs in some apps when
a write domain is lost on a buffer that gets reused for instruction or
commmand state.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>