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In following with the old restore code, we must now restore ever PPGTT's PDEs, since they aren't proper GEM ojbects. v2: Rebased on BDW. Only do restore pdes for gen6 & 7 Signed-off-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>