drm/i915: Support 64b execbuf
Previously, our code only had a 32b offset value for where the batchbuffer starts. With full PPGTT, and 64b canonical GPU address space, that is an insufficient value. The code to expand is pretty straight forward, and only one platform needs to do anything with the extra bits. Signed-off-by: NBen Widawsky <ben@bwidawsk.net> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NRafael Barbalho <rafael.barbalho@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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