[RFCv4 12/21] media: videobuf2: add support for requests

[Alexandre Courbot <acourbot@chromium.org>]

Make vb2 core aware of requests. Drivers can specify whether a given
queue accepts requests or not.

Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
---
 drivers/media/common/videobuf2/videobuf2-core.c | 3 +++
 include/media/videobuf2-core.h                  | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index debe35fc66b4..355fe7dc99d7 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -930,6 +930,9 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
 		vb->state = state;
 	}
 	atomic_dec(&q->owned_by_drv_count);
+
+	vb->request = NULL;
+
 	spin_unlock_irqrestore(&q->done_lock, flags);
 
 	trace_vb2_buf_done(q, vb);
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 5b6c541e4e1b..6e9e814886e7 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -238,6 +238,7 @@ struct vb2_queue;
  * @num_planes:		number of planes in the buffer
  *			on an internal driver queue.
  * @timestamp:		frame timestamp in ns.
+ * @request:		request the buffer belongs to, if any.
  */
 struct vb2_buffer {
 	struct vb2_queue	*vb2_queue;
@@ -246,6 +247,7 @@ struct vb2_buffer {
 	unsigned int		memory;
 	unsigned int		num_planes;
 	u64			timestamp;
+	struct media_request	*request;
 
 	/* private: internal use only
 	 *
@@ -446,6 +448,7 @@ 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.
+ * @allow_requests:	whether requests are supported on this queue.
  * @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
@@ -513,6 +516,7 @@ struct vb2_queue {
 	unsigned			fileio_write_immediately:1;
 	unsigned			allow_zero_bytesused:1;
 	unsigned		   quirk_poll_must_check_waiting_for_buffers:1;
+	unsigned			allow_requests:1;
 
 	struct mutex			*lock;
 	void				*owner;
-- 
2.16.1.291.g4437f3f132-goog