drm/i915/gtt: Setup phys pages for 3lvl pdps
If we setup backing phys page for 3lvl pdps, as they are not used, we will lose 5 pages per ppgtt. Trading this memory on bsw, we gain more common code paths for all gen8+ directory manipulation. And those paths are now void of checks for page directory type, making the hot paths faster. v2: don't shortcut vm (Chris) Signed-off-by: NMika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20190705215204.4559-3-chris@chris-wilson.co.uk
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