[Intel-gfx] [PATCH] drm/i95: Mark GGTT as incoherent for gen10+

[Chris Wilson]

Quoting Mika Kuoppala (2018-08-01 14:08:33)
> Chris Wilson <chris at chris-wilson.co.uk> 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 <mika.kuoppala at linux.intel.com>

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