drm/i915/gtt: Skip clearing the GGTT under gen6+ full-ppgtt
If we know that the user cannot access the GGTT, by virtue of having a segregated memory area, we can skip clearing the unused entries as they cannot be accessed. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Matthew Auld <matthew.william.auld@gmail.com> Reviewed-by: NMatthew Auld <matthew.william.auld@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190419201207.5477-1-chris@chris-wilson.co.uk
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