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drm/i915/gtt: Introduce fill_page_dma()
When we setup page directories and tables, we point the entries
to a to the next level scratch structure. Make this generic
by introducing a fill_page_dma which maps and flushes. We also
need 32 bit variant for legacy gens.
v2: Fix flushes and handle valleyview (Ville)
v3: Now really fix flushes (Michel, Ville)
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>