Quoting Matthew Auld (2019-02-14 14:57:29)
> From: Abdiel Janulgue <abdiel.janul...@linux.intel.com>
> 
> If there is no aperture we can't use map_gtt to map dumb buffers, so we
> need a cpu-map based path to do it. We prefer map_gtt on platforms that
> do have aperture.

This is very hard as a standalone patch to see if you the semantics for
dumb buffers correct. Is is coherent for starters?
-Chris
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