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Date:   Thu,  7 Sep 2017 15:42:21 -0300
From:   Gustavo Padovan <>
Cc:     Hans Verkuil <>,
        Mauro Carvalho Chehab <>,
        Shuah Khan <>,,
        Gustavo Padovan <>
Subject: [PATCH v3 10/15] [media] vb2: add 'ordered' property to queues

From: Gustavo Padovan <>

For explicit synchronization (and soon for HAL3/Request API) we need
the v4l2-driver to guarantee the ordering in which the buffers were queued
by userspace. This is already true for many drivers, but we never needed
to say it.

Signed-off-by: Gustavo Padovan <>
 include/media/videobuf2-core.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 5ed8d3402474..20099dc22f26 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -508,6 +508,9 @@ struct vb2_buf_ops {
  * @last_buffer_dequeued: used in poll() and DQBUF to immediately return if the
  *		last decoded buffer was already dequeued. Set for capture queues
  *		when a buffer with the V4L2_BUF_FLAG_LAST is dequeued.
+ * @ordered: if the driver can guarantee that the queue will be ordered or not.
+ *		The default is not ordered unless the driver sets this flag. It
+ *		is mandatory for using explicit fences.
  * @fileio:	file io emulator internal data, used only if emulator is active
  * @threadio:	thread io internal data, used only if thread is active
@@ -560,6 +563,7 @@ struct vb2_queue {
 	unsigned int			is_output:1;
 	unsigned int			copy_timestamp:1;
 	unsigned int			last_buffer_dequeued:1;
+	unsigned int			ordered:1;
 	struct vb2_fileio_data		*fileio;
 	struct vb2_threadio_data	*threadio;

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