'To prevent false VT-d type 6 error, the sprites must be 128KiB aligned, and require an extra 64 PTEs of padding afterward'
commit e4054a376b6c357c68215a4e2db2636a8a05e7ba Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Tue Mar 5 14:52:39 2013 +0000 drm/i915: Apply alignment restrictions on scanout surfaces for VT-d
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