On Mon, Dec 03, 2012 at 06:43:32PM +0200, [email protected] wrote:
> From: Ville Syrjälä <[email protected]>
>
> From BSpec:
> "If the Ring Buffer Head Pointer and the Tail Pointer are on the same
> cacheline, the Head Pointer must not be greater than the Tail
> Pointer."
>
> The easiest way to enforce this is to reduce the reported ring space.
>
> References:
> Gen2 BSpec "1. Programming Environment" / 1.4.4.6 "Ring Buffer Use"
> Gen3 BSpec "vol1c Memory Interface Functions" / 2.3.4.5 "Ring Buffer Use"
> Gen4+ BSpec "vol1c Memory Interface and Command Stream" / 5.3.4.5 "Ring
> Buffer Use"
>
> v2: Include the exact BSpec references in the description
>
> v3: s/64/I915_RING_FREE_SPACE, and add the BSpec information to the code
>
> Signed-off-by: Ville Syrjälä <[email protected]>
> Reviewed-by: Chris Wilson <[email protected]>
Picked up for -fixes, thanks for the patch.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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