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

[Chris Wilson]

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.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre