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In the future we may like to experiment with using a WC map of the GTT portion. However, that will conflict with i915.ko mapping the entire bar as UC in order to access the GPU registers. Instead we can shrink the register ioremap to only map the register block. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Tested-by (IVB): Ben Widawsky <ben@bwidawsk.net> Acked-by: Ben Widawsky <ben@bwidawsk.net> [danvet: Squashed-in follow-up fix for gen2/3 registers file size from Chris Wilson.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>