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drm/i915: Return a mask of the active rings in the high word of busy_ioctl

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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>
This commit is contained in:
Chris Wilson 2012-07-04 12:25:08 +01:00 committed by Daniel Vetter
parent c0c7babc48
commit e9808edd98
2 changed files with 9 additions and 1 deletions
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4
drivers/gpu/drm/i915/i915_gem.c
View File

@ -3400,6 +3400,10 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
ret = i915_gem_object_flush_active(obj);
args->busy = obj->active;
if (obj->ring) {
BUILD_BUG_ON(I915_NUM_RINGS > 16);
args->busy |= intel_ring_flag(obj->ring) << 16;
}
drm_gem_object_unreference(&obj->base);
unlock:

6
include/drm/i915_drm.h
View File

@ -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;
};