Chris Wilson d0a57789d5
drm/i915: Only insert the mb() before updating the fence parameter ...
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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d0a57789d5