633cf8f505
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 <ville.syrjala@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> |
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