drm/i915: Serialize against vma moves
Make sure that when submitting requests, we always serialize against potential vma moves and clflushes. Time for a i915_request_await_vma() interface! Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> Reviewed-by: NMatthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190819112033.30638-1-chris@chris-wilson.co.uk
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