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The intention is to help select which engine to use for copies with interoperating clients - such as a GL client making a request to the X server to perform a SwapBuffers, which may require copying from the active GL back buffer to the X front buffer. We choose to report a mask of the active rings to future proof the interface against any changes which may allow for the object to reside upon multiple rings. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> [danvet: bikeshed away the write ring mask and add the explanation Chris sent in a follow-up mail why we decided to use masks.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>