drm/i915: Reuse legacy breadcrumbs + tail emission
As GEN6+ is now a simple variant on the basic breadcrumbs + tail write, reuse the common code. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1469432687-22756-26-git-send-email-chris@chris-wilson.co.uk Link: http://patchwork.freedesktop.org/patch/msgid/1470174640-18242-17-git-send-email-chris@chris-wilson.co.uk
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