Quoting Mika Kuoppala (2018-08-01 14:08:33)
> Chris Wilson <[email protected]> writes:
> 
> > The evidence suggests that we need to start treating writes via GGTT as
> > incoherent for gen10+, that is that they are internally buffered and not
> > immediately visible via a read along a different physical path.
> >
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107398
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107400
> 
> Looks like it. And we don't have better explanations at this point.
> 
> Reviewed-by: Mika Kuoppala <[email protected]>

Applied, err on the side of safety. We can try setting it to true later
and see how it fares then.
-Chris
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