drm/i915/gtt: Introduce struct i915_page_dma
All our paging structures have struct page and dma address for that page. Add struct for page/dma address pairs and use it to make the setup and teardown for different paging structures identical. Include the page directory offset also in the struct for legacy gens. Rename it to clearly point out that it is offset into the ggtt. v2: Add comment about ggtt_offset (Michel) Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com> Reviewed-by: Michel Thierry <michel.thierry@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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