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drm/prime: add a bit of documentation about gem_obj->import_attach

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Lifetime rules seem to be solid around ->import_attach. So this patch
just properly documents them.

Note that pointing directly at the attachment might have issues for
devices that have multiple struct device *dev parts constituting the
logical gpu and so might need multiple attachment points. Similarly
for drm devices which don't need a dma attachment at all (like udl).

But fixing that up is material for different patches.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Daniel Vetter 2013-08-15 00:02:33 +02:00 committed by Dave Airlie
parent 01ce605a7b
commit 7106bf96f8
1 changed files with 10 additions and 1 deletions
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11
include/drm/drmP.h
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@ -665,7 +665,16 @@ struct drm_gem_object {
/* dma buf exported from this GEM object */
struct dma_buf *export_dma_buf;
/* dma buf attachment backing this object */
/**
* import_attach - dma buf attachment backing this object
*
* Any foreign dma_buf imported as a gem object has this set to the
* attachment point for the device. This is invariant over the lifetime
* of a gem object.
*
* The driver's ->gem_free_object callback is responsible for cleaning
* up the dma_buf attachment and references acquired at import time.
*/
struct dma_buf_attachment *import_attach;
};