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(parent: 1741dd4) | patch
drm/i915: Move ringbuffer accounting to begin/advance.
authorChris Wilson <chris@chris-wilson.co.uk>
Wed, 4 Aug 2010 14:18:13 +0000 (15:18 +0100)
committerEric Anholt <eric@anholt.net>
Mon, 9 Aug 2010 18:24:31 +0000 (11:24 -0700)
commitd97ed3396399126cfca1e12e2b2e2d8bbc4924e5
tree831529a147ec7cd85ae080e415a84b351af574fetree | snapshot (tar.gz zip)
parent1741dd4aa7552055659bf74ab829a21579407f10commit | diff
drm/i915: Move ringbuffer accounting to begin/advance.

As we check that the ringbuffer will not wrap upon emission, we do not
need to check that incrementing the tail wrapped every time. However, we
do upon advancing just in case the tail is now pointing at the very end
of the ring.

Likewise we can account for the space used during emission in begin()
and avoid decrementing it for every emit.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>
drivers/gpu/drm/i915/intel_ringbuffer.c diff | blob | blame | history