From e9808edd98679680804dfbc42c5ee8f1aa91f617 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 4 Jul 2012 12:25:08 +0100 Subject: drm/i915: Return a mask of the active rings in the high word of busy_ioctl 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 [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 --- include/drm/i915_drm.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'include/drm/i915_drm.h') diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h index b923b032743f..0f149fe32211 100644 --- a/include/drm/i915_drm.h +++ b/include/drm/i915_drm.h @@ -704,7 +704,11 @@ struct drm_i915_gem_busy { /** Handle of the buffer to check for busy */ __u32 handle; - /** Return busy status (1 if busy, 0 if idle) */ + /** Return busy status (1 if busy, 0 if idle). + * The high word is used to indicate on which rings the object + * currently resides: + * 16:31 - busy (r or r/w) rings (16 render, 17 bsd, 18 blt, etc) + */ __u32 busy; }; -- cgit v1.2.3-59-g8ed1b