drm/i915: Refactor gen6_flush_pd()
As the gen6 page directory is written on binding and after every update, the code ended up duplicated. Refactor the code into a single routine to share the locking and serialisation. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Acked-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191201140916.2128905-1-chris@chris-wilson.co.uk
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