drm/i915: Use page coloring to provide the guard page at the end of the GTT
As we now mark the reserved hole (drm_mm.head_node) with the special UNEVICTABLE color, we can use the page coloring to avoid prefetching of the CS beyond the end of the GTT. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170206084547.27921-3-chris@chris-wilson.co.ukReviewed-by: Matthew Auld <matthew.auld@intel.com>
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