[Intel-gfx] [PATCH 1/2] drm/i915: Don't allow ring tail to reach the same cacheline as head

[Chris Wilson]

On Mon, 26 Nov 2012 14:48:18 +0200, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> According to BSpec the ring head and tail pointers must not be
> on the same cacheline when head > tail. The easiest way to enforce
> this is to reduce the reported ring space.

I'm going to admit blindness because I don't see that warning in the
gen2-gen7 bspecs. Can you please give chapter and verse, and check to
see if there is a rationale?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre