Quoting Mika Kuoppala (2018-05-07 17:52:18)
> We use a pattern of wmb() along with ggtt_invalidate.
> Move the wmb out from call sites into the ggtt_invalidate
> as it is part of invalidation.
> 
> Cc: Chris Wilson <[email protected]>
> Cc: Matthew Auld <[email protected]>
> Signed-off-by: Mika Kuoppala <[email protected]>

If we take this and the last which look at ggtt together, then
Reviewed-by: Chris Wilson <[email protected]>

I've a persistent dread when it comes to write through the GTT itself,
as different wc buffers seem to mess up aliasing, but this should be
simple wc vs uc mmio, so playing by concrete rules.
-Chris
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