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In the next patch, we will want to configure the slave request depending on which physical engine the master request is executed on. For this, we introduce a callback from the execute fence to convey this information. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190521211134.16117-8-chris@chris-wilson.co.uk