linux-kernel - [RFC v4 06/17] [media] vb2: add .send_out_fence() to notify userspace of out_fence

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Date:   Fri, 20 Oct 2017 19:50:01 -0200
From:   Gustavo Padovan <gustavo@...ovan.org>
To:     linux-media@...r.kernel.org
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Shuah Khan <shuahkh@....samsung.com>,
        Pawel Osciak <pawel@...iak.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        Sakari Ailus <sakari.ailus@....fi>,
        Brian Starkey <brian.starkey@....com>,
        linux-kernel@...r.kernel.org,
        Gustavo Padovan <gustavo.padovan@...labora.com>
Subject: [RFC v4 06/17] [media] vb2: add .send_out_fence() to notify userspace of out_fence_fd

From: Gustavo Padovan <gustavo.padovan@...labora.com>

With the upcoming explicit synchronization support to V4L2 we need a
way to notify userspace of the out_fence_fd when buffers are queued to the
driver - buffers with in-fences attached to it can only be queued once the
fence signal, so the queueing to the driver might be deferred.

v2: rename to .send_out_fence()

Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.com>
---
 include/media/videobuf2-core.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index ef9b64398c8c..96af4eb49e52 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -408,6 +408,7 @@ struct vb2_ops {
  *			will return an error.
  * @copy_timestamp:	copy the timestamp from a userspace structure to
  *			the vb2_buffer struct.
+ * @send_out_fence:	send an out_fence fd of the buffer queued to userspace.
  */
 struct vb2_buf_ops {
 	int (*verify_planes_array)(struct vb2_buffer *vb, const void *pb);
@@ -415,6 +416,7 @@ struct vb2_buf_ops {
 	int (*fill_vb2_buffer)(struct vb2_buffer *vb, const void *pb,
 				struct vb2_plane *planes);
 	void (*copy_timestamp)(struct vb2_buffer *vb, const void *pb);
+	void (*send_out_fence)(struct vb2_buffer *vb);
 };
 
 /**
-- 
2.13.6