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GEN8 PPGTT range clearing is very similar to GEN6 if we assume that our PDEs are all valid, which they should be. v2: Rebase on top of the address space refactoring. v3: Rebase on top of the bool use_scratch addition to the clear_range interface. Reviewed-by: Imre Deak <imre.deak@intel.com> Signed-off-by: Ben Widawsky <ben@bwidawsk.net> (v1) Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>