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Adds a parameter which can be used with DRM_I915_GETPARAM to query the GPU revision. The intention is to use this in Mesa to implement the WaDisableSIMD16On3SrcInstr workaround on Skylake but only for revision 2. Signed-off-by: Neil Roberts <neil@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>