From: Simon Ser Date: Wed, 4 Nov 2020 17:01:40 +0000 (+0000) Subject: drm: document that blobs are ref'counted X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f3f0e410c6a848c8f5b2715167eaa31c407cfb70;p=linux.git drm: document that blobs are ref'counted 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 Signed-off-by: Daniel Stone Reviewed-by: Jonas Ådahl Reviewed-by: Pekka Paalanen Reviewed-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/wgav99DTGfubfVPiurrydQEiyufYpxlJQZ0wJMWYBQ@cp7-web-042.plabs.ch --- diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index 863eda0482652..5ad10ab2a5775 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;