[PATCH v2] drm: document that blobs are ref'counted

[Jonas Ådahl]

On Thu, Nov 05, 2020 at 10:56:53AM +0200, Pekka Paalanen wrote:
> On Wed, 04 Nov 2020 17:01:40 +0000
> Simon Ser <contact at emersion.fr> wrote:
> 
> > User-space doesn't need to keep track of blobs that might be in use by
> > the kernel. User-space can just destroy blobs as soon as they don't need
> > them anymore.
> > 
> > Signed-off-by: Simon Ser <contact at emersion.fr>
> > Signed-off-by: Daniel Stone <daniel at fooishbar.org>
> > Reviewed-by: Jonas Ådahl <jadahl at gmail.com>
> > Cc: Pekka Paalanen <ppaalanen at gmail.com>
> > Cc: Daniel Vetter <daniel at ffwll.ch>
> > ---
> >  include/uapi/drm/drm_mode.h | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> > index 863eda048265..5ad10ab2a577 100644
> > --- a/include/uapi/drm/drm_mode.h
> > +++ b/include/uapi/drm/drm_mode.h
> > @@ -924,6 +924,12 @@ struct drm_mode_create_blob {
> >   * struct drm_mode_destroy_blob - Destroy user blob
> >   * @blob_id: blob_id to destroy
> >   * Destroy a user-created blob property.
> > + *
> > + * User-space can release blobs as soon as they do not need to refer to them by
> > + * their blob object ID.  For instance, if you are using a MODE_ID blob in an
> > + * atomic commit and you will not make another commit re-using the same ID, you
> > + * can destroy the blob as soon as the commit has been issued, without waiting
> > + * for it to complete.
> >   */
> >  struct drm_mode_destroy_blob {
> >  	__u32 blob_id;
> 
> Reviewed-by: Pekka Paalanen <pekka.paalanen at collabora.com>

This version is as clear to me as the previous one so both are

Reviewed-by: Jonas Ådahl <jadahl at gmail.com>


Jonas

> 
> 
> Thanks,
> pq