[Intel-gfx] [PATCH] drm/i915: Exclude top-page for ppgtt as well as ggtt

[Chris Wilson]

On Fri, May 12, 2017 at 06:55:35PM +0100, Chris Wilson wrote:
> On Fri, May 12, 2017 at 06:49:09PM +0100, Chris Wilson wrote:
> > We have always excluded the top-page of the Global GTT to prevent
> > prefetching past the end of the address space. We have been lax about
> > applying this restriction to the per-process GTT, but there is no reason
> > to believe that the hw restriction is any less severe.
> 
> Other than empirical, but the note in bspec is still there and who knows
> they may start to be strict again in future.

Fwiw, it looks like we can sleep on this again. Jason no longer believes
this to be an immediate issue.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre