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From: Yunfei Dong <yunfei.dong@mediatek.com>
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Subject: [PATCH v6,01/24] v4l2: add restricted memory flags
Date: Thu, 16 May 2024 20:20:39 +0800
Message-ID: <20240516122102.16379-2-yunfei.dong@mediatek.com>
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From: Jeffrey Kardatzke <jkardatzke@google.com>

Adds a V4L2 flag which indicates that a queue is using restricted
dmabufs and the corresponding capability flag.

Signed-off-by: Jeffrey Kardatzke <jkardatzke@google.com>
Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
---
 include/media/videobuf2-core.h | 8 +++++++-
 include/uapi/linux/videodev2.h | 2 ++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 955237ac503d..afd497e93a37 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -517,6 +517,9 @@ struct vb2_buf_ops {
  *		->finish().
  * @non_coherent_mem: when set queue will attempt to allocate buffers using
  *		non-coherent memory.
+ * @allow_restricted_mem: when set user-space can pass the %V4L2_MEMORY_FLAG_RESTRICTED
+ *		flag to indicate the dma bufs are restricted.
+ * @restricted_mem: when set queue will verify that the dma bufs are restricted.
  * @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
@@ -621,6 +624,8 @@ struct vb2_queue {
 	unsigned int			uses_requests:1;
 	unsigned int			allow_cache_hints:1;
 	unsigned int			non_coherent_mem:1;
+	unsigned int			allow_restricted_mem:1;
+	unsigned int			restricted_mem:1;
 
 	struct mutex			*lock;
 	void				*owner;
@@ -792,7 +797,8 @@ void vb2_core_querybuf(struct vb2_queue *q, struct vb2_buffer *vb, void *pb);
  * @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.
+ *		used flags are %V4L2_MEMORY_FLAG_NON_COHERENT and
+ *		%V4L2_MEMORY_FLAG_RESTRICTED.
  * @count:	requested buffer count.
  *
  * Videobuf2 core helper to implement VIDIOC_REQBUF() operation. It is called
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index fe6b67e83751..89eb1a3c6555 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1043,6 +1043,7 @@ struct v4l2_requestbuffers {
 };
 
 #define V4L2_MEMORY_FLAG_NON_COHERENT			(1 << 0)
+#define V4L2_MEMORY_FLAG_RESTRICTED			(1 << 1)
 
 /* capabilities for struct v4l2_requestbuffers and v4l2_create_buffers */
 #define V4L2_BUF_CAP_SUPPORTS_MMAP			(1 << 0)
@@ -1054,6 +1055,7 @@ struct v4l2_requestbuffers {
 #define V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS		(1 << 6)
 #define V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS		(1 << 7)
 #define V4L2_BUF_CAP_SUPPORTS_REMOVE_BUFS		(1 << 8)
+#define V4L2_BUF_CAP_SUPPORTS_RESTRICTED_MEM		(1 << 9)
 
 /**
  * struct v4l2_plane - plane info for multi-planar buffers
-- 
2.25.1