[PATCH v9 05/15] vb2: add unordered vb2_queue property for drivers

[Ezequiel Garcia <ezequiel@collabora.com>]

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

Explicit synchronization benefits a lot from ordered queues, they fit
better in a pipeline with DRM for example so create a opt-in way for
drivers notify videobuf2 that the queue is unordered.

v5: go back to a bitfield property for the unordered property.

v4: rename it to vb2_ops_is_unordered() (Hans Verkuil)

v3: - make it bool (Hans)
    - create vb2_ops_set_unordered() helper

v2: improve comments for is_unordered flag (Hans Verkuil)

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
---
 include/media/videobuf2-core.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index f9633de0386c..364e4cb41b10 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -467,6 +467,8 @@ struct vb2_buf_ops {
  * @quirk_poll_must_check_waiting_for_buffers: Return %EPOLLERR at poll when QBUF
  *              has not been called. This is a vb1 idiom that has been adopted
  *              also by vb2.
+ * @unordered:	tell if the queue is unordered, i.e. buffers can be
+ *		dequeued in a different order from how they were queued.
  * @lock:	pointer to a mutex that protects the &struct vb2_queue. The
  *		driver can set this to a mutex to let the v4l2 core serialize
  *		the queuing ioctls. If the driver wants to handle locking
@@ -533,6 +535,7 @@ struct vb2_queue {
 	unsigned			fileio_read_once:1;
 	unsigned			fileio_write_immediately:1;
 	unsigned			allow_zero_bytesused:1;
+	unsigned			unordered:1;
 	unsigned		   quirk_poll_must_check_waiting_for_buffers:1;
 
 	struct mutex			*lock;
-- 
2.16.3