d0a57789d5
With a fence, we only need to insert a memory barrier around the actual fence alteration for CPU accesses through the GTT. Performing the barrier in flush-fence was inserting unnecessary and expensive barriers for never fenced objects. Note removing the barriers from flush-fence, which was effectively a barrier before every direct access through the GTT, revealed that we where missing a barrier before the first access through the GTT. Lack of that barrier was sufficient to cause GPU hangs. v2: Add a couple more comments to explain the new barriers Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> |
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