drm/i915: Introduce i915_ggtt_offset()
This little helper only exists to safely discard the upper unused 32bits of the general 64-bit VMA address - as we know that all Global GTT currently are less than 4GiB in size and so that the upper bits must be zero. In many places, we use a u32 for the global GTT offset and we want to document where we are discarding the full VMA offset. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1471254551-25805-28-git-send-email-chris@chris-wilson.co.uk
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