media: videobuf2: add queue memory coherency parameter

Preparations for future V4L2_MEMORY_FLAG_NON_COHERENT support.

Extend the vb2_core_reqbufs() parameters list to accept requests'
->flags, which will be used for memory coherency configuration.

An attempt to allocate a buffer with coherency requirements
that do not match the queue's consistency model will fail.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

1 files changed, 8 insertions, 2 deletions

diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 66e548268242..2467284e5f26 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -504,6 +504,8 @@ struct vb2_buf_ops {
  * @allow_cache_hints: when set user-space can pass cache management hints in
  *		order to skip cache flush/invalidation on ->prepare() or/and
  *		->finish().
+ * @non_coherent_mem: when set queue will attempt to allocate buffers using
+ *		non-coherent memory.
  * @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
@@ -583,6 +585,7 @@ struct vb2_queue {
 	unsigned int			uses_qbuf:1;
 	unsigned int			uses_requests:1;
 	unsigned int			allow_cache_hints:1;
+	unsigned int			non_coherent_mem:1;
 
 	struct mutex			*lock;
 	void				*owner;
@@ -748,6 +751,8 @@ void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb);
  * vb2_core_reqbufs() - Initiate streaming.
  * @q:		pointer to &struct vb2_queue with videobuf2 queue.
  * @memory:	memory type, as defined by &enum vb2_memory.
+ * @flags:	auxiliary queue/buffer management flags. Currently, the only
+ *		used flag is %V4L2_MEMORY_FLAG_NON_COHERENT.
  * @count:	requested buffer count.
  *
  * Videobuf2 core helper to implement VIDIOC_REQBUF() operation. It is called
@@ -772,12 +777,13 @@ void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb);
  * Return: returns zero on success; an error code otherwise.
  */
 int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
-		    unsigned int *count);
+		     unsigned int flags, unsigned int *count);
 
 /**
  * vb2_core_create_bufs() - Allocate buffers and any required auxiliary structs
  * @q: pointer to &struct vb2_queue with videobuf2 queue.
  * @memory: memory type, as defined by &enum vb2_memory.
+ * @flags: auxiliary queue/buffer management flags.
  * @count: requested buffer count.
  * @requested_planes: number of planes requested.
  * @requested_sizes: array with the size of the planes.
@@ -795,7 +801,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
  * Return: returns zero on success; an error code otherwise.
  */
 int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
-			 unsigned int *count,
+			 unsigned int flags, unsigned int *count,
 			 unsigned int requested_planes,
 			 const unsigned int requested_sizes[]);