diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2012-07-04 12:25:08 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-07-25 18:23:50 +0200 |
| commit | e9808edd98679680804dfbc42c5ee8f1aa91f617 (patch) | |
| tree | 5c5538b47f12b16de8faf3809479aebe76c67692 /include/drm | |
| parent | c0c7babc48c4f6943ed3070d04630ea3ac9272ee (diff) | |
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 <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>
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/i915_drm.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h index b923b032743..0f149fe3221 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; }; |