drm/i915: Fix context size calculation on SNB/IVB/VLV
All the different context sizes reported in the CXT_SIZE register aren't meant to be simply added together. While BSpec is somewhat unclear on the topic of the actual context size, empirical tests have now revealed the truth. So let's add a big fat comment to remind people how it all works. As a result of correctly interpreting CXT_SIZE, the IVB context size is reduced from three pages to two, while SNB context size remains at two pages. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Acked-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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