linux-kernel - [PATCH v6,01/24] v4l2: add restricted memory flags

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Date: Thu, 16 May 2024 20:20:39 +0800
From: Yunfei Dong <yunfei.dong@...iatek.com>
To: Jeffrey Kardatzke <jkardatzke@...gle.com>,
	Nícolas F . R . A . Prado
	<nfraprado@...labora.com>, Nathan Hebert <nhebert@...omium.org>, "Nicolas
 Dufresne" <nicolas.dufresne@...labora.com>, Hans Verkuil
	<hverkuil-cisco@...all.nl>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, Benjamin Gaignard
	<benjamin.gaignard@...labora.com>, Sebastian Fricke
	<sebastian.fricke@...labora.com>, Tomasz Figa <tfiga@...omium.org>, "Mauro
 Carvalho Chehab" <mchehab@...nel.org>, Marek Szyprowski
	<m.szyprowski@...sung.com>
CC: Chen-Yu Tsai <wenst@...omium.org>, Yong Wu <yong.wu@...iatek.com>,
	"Hsin-Yi Wang" <hsinyi@...omium.org>, Fritz Koenig <frkoenig@...omium.org>,
	"Daniel Vetter" <daniel@...ll.ch>, Steve Cho <stevecho@...omium.org>, Yunfei
 Dong <yunfei.dong@...iatek.com>, Sumit Semwal <sumit.semwal@...aro.org>,
	"Brian Starkey" <Brian.Starkey@....com>, John Stultz <jstultz@...gle.com>, "T
 . J . Mercier" <tjmercier@...gle.com>, Christian König
	<christian.koenig@....com>, Matthias Brugger <matthias.bgg@...il.com>,
	<linux-media@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH v6,01/24] v4l2: add restricted memory flags

From: Jeffrey Kardatzke <jkardatzke@...gle.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@...gle.com>
Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.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