[PATCH v5 2/7] media: v4l2: Add extended buffer operations

[Helen Koike]

From: Hans Verkuil <hans.verkuil@xxxxxxxxx>

Those extended buffer ops have several purpose:
1/ Fix y2038 issues by converting the timestamp into an u64 counting
   the number of ns elapsed since 1970
2/ Unify single/multiplanar handling
3/ Add a new start offset field to each v4l2 plane buffer info struct
   to support the case where a single buffer object is storing all
   planes data, each one being placed at a different offset

New hooks are created in v4l2_ioctl_ops so that drivers can start using
these new objects.

The core takes care of converting new ioctls requests to old ones
if the driver does not support the new hooks, and vice versa.

Note that the timecode field is gone, since there doesn't seem to be
in-kernel users. We can be added back in the reserved area if needed or
use the Request API to collect more metadata information from the
frame.

Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
Signed-off-by: Helen Koike <helen.koike@xxxxxxxxxxxxx>
---
Changes in v5:
- migrate memory from v4l2_ext_buffer to v4l2_ext_plane
- return mem_offset to struct v4l2_ext_plane
- change sizes and reorder fields to avoid holes in the struct and make
  it the same for 32 and 64 bits

Changes in v4:
- Use v4l2_ext_pix_format directly in the ioctl, drop v4l2_ext_format,
making V4L2_BUF_TYPE_VIDEO_[OUTPUT,CAPTURE] the only valid types.
- Drop VIDIOC_EXT_EXPBUF, since the only difference from VIDIOC_EXPBUF
was that with VIDIOC_EXT_EXPBUF we could export multiple planes at once.
I think we can add this later, so I removed it from this RFC to simplify it.
- Remove num_planes field from struct v4l2_ext_buffer
- Add flags field to struct v4l2_ext_create_buffers
- Reformulate struct v4l2_ext_plane
- Fix some bugs caught by v4l2-compliance
- Rebased on top of media/master (post 5.8-rc1)

Changes in v3:
- Rebased on top of media/master (post 5.4-rc1)

Changes in v2:
- Add reserved space to v4l2_ext_buffer so that new fields can be added
  later on
---
 drivers/media/v4l2-core/v4l2-dev.c   |  29 ++-
 drivers/media/v4l2-core/v4l2-ioctl.c | 353 +++++++++++++++++++++++++--
 include/media/v4l2-ioctl.h           |  26 ++
 include/uapi/linux/videodev2.h       |  90 +++++++
 4 files changed, 476 insertions(+), 22 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index e1829906bc086..cb21ee8eb075c 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -720,15 +720,34 @@ static void determine_valid_ioctls(struct video_device *vdev)
 		SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_sdr_out);
 	}
 
+	if (is_vid || is_tch) {
+		/* ioctls valid for video and touch */
+		if (ops->vidioc_querybuf || ops->vidioc_ext_querybuf)
+			set_bit(_IOC_NR(VIDIOC_EXT_QUERYBUF), valid_ioctls);
+		if (ops->vidioc_qbuf || ops->vidioc_ext_qbuf)
+			set_bit(_IOC_NR(VIDIOC_EXT_QBUF), valid_ioctls);
+		if (ops->vidioc_dqbuf || ops->vidioc_ext_dqbuf)
+			set_bit(_IOC_NR(VIDIOC_EXT_DQBUF), valid_ioctls);
+		if (ops->vidioc_create_bufs || ops->vidioc_ext_create_bufs)
+			set_bit(_IOC_NR(VIDIOC_EXT_CREATE_BUFS), valid_ioctls);
+		if (ops->vidioc_prepare_buf || ops->vidioc_ext_prepare_buf)
+			set_bit(_IOC_NR(VIDIOC_EXT_PREPARE_BUF), valid_ioctls);
+	}
+
 	if (is_vid || is_vbi || is_sdr || is_tch || is_meta) {
 		/* ioctls valid for video, vbi, sdr, touch and metadata */
 		SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs);
-		SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf);
-		SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf);
 		SET_VALID_IOCTL(ops, VIDIOC_EXPBUF, vidioc_expbuf);
-		SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf);
-		SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs);
-		SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf);
+		if (ops->vidioc_querybuf || ops->vidioc_ext_querybuf)
+			set_bit(_IOC_NR(VIDIOC_QUERYBUF), valid_ioctls);
+		if (ops->vidioc_qbuf || ops->vidioc_ext_qbuf)
+			set_bit(_IOC_NR(VIDIOC_QBUF), valid_ioctls);
+		if (ops->vidioc_dqbuf || ops->vidioc_ext_dqbuf)
+			set_bit(_IOC_NR(VIDIOC_DQBUF), valid_ioctls);
+		if (ops->vidioc_create_bufs || ops->vidioc_ext_create_bufs)
+			set_bit(_IOC_NR(VIDIOC_CREATE_BUFS), valid_ioctls);
+		if (ops->vidioc_prepare_buf || ops->vidioc_ext_prepare_buf)
+			set_bit(_IOC_NR(VIDIOC_PREPARE_BUF), valid_ioctls);
 		SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon);
 		SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff);
 	}
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 14a0def50f8ea..7ecdd9cc1bf48 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -527,6 +527,26 @@ static void v4l_print_buffer(const void *arg, bool write_only)
 			tc->type, tc->flags, tc->frames, *(__u32 *)tc->userbits);
 }
 
+static void v4l_print_ext_buffer(const void *arg, bool write_only)
+{
+	const struct v4l2_ext_buffer *e = arg;
+	const struct v4l2_ext_plane *plane;
+	unsigned int i;
+
+	pr_cont("%lld index=%d, type=%s, flags=0x%08x, field=%s, sequence=%d\n",
+		e->timestamp, e->index, prt_names(e->type, v4l2_type_names),
+		e->flags, prt_names(e->field, v4l2_field_names), e->sequence);
+
+	for (i = 0; i < VIDEO_MAX_PLANES &&
+		    e->planes[i].buffer_length; i++) {
+		plane = &e->planes[i];
+		pr_debug("plane %d: buffer_length=%d, plane_length=%d offset=0x%08x, memory=%s\n",
+			 i, plane->buffer_length, plane->plane_length,
+			 plane->offset,
+			 prt_names(plane->memory, v4l2_memory_names));
+	}
+}
+
 static void v4l_print_exportbuffer(const void *arg, bool write_only)
 {
 	const struct v4l2_exportbuffer *p = arg;
@@ -546,6 +566,15 @@ static void v4l_print_create_buffers(const void *arg, bool write_only)
 	v4l_print_format(&p->format, write_only);
 }
 
+static void v4l_print_ext_create_buffers(const void *arg, bool write_only)
+{
+	const struct v4l2_ext_create_buffers *p = arg;
+
+	pr_cont("index=%d, count=%d, memory=%s, ", p->index, p->count,
+		prt_names(p->memory, v4l2_memory_names));
+	v4l_print_ext_pix_format(&p->format, write_only);
+}
+
 static void v4l_print_streamparm(const void *arg, bool write_only)
 {
 	const struct v4l2_streamparm *p = arg;
@@ -1220,6 +1249,143 @@ int v4l2_format_to_ext_pix_format(const struct v4l2_format *f,
 }
 EXPORT_SYMBOL_GPL(v4l2_format_to_ext_pix_format);
 
+/*
+ * If mplane_cap is true, b->m.planes should have a valid pointer of a
+ * struct v4l2_plane array, and b->length with its size
+ */
+int v4l2_ext_buffer_to_buffer(const struct v4l2_ext_buffer *e,
+			      struct v4l2_buffer *b, bool mplane_cap)
+{
+	unsigned int planes_array_size = b->length;
+	struct v4l2_plane *planes = b->m.planes;
+	u64 nsecs;
+
+	if (!mplane_cap && e->planes[1].buffer_length != 0)
+		return -EINVAL;
+
+	memset(b, 0, sizeof(*b));
+
+	b->index = e->index;
+	b->flags = e->flags;
+	b->field = e->field;
+	b->sequence = e->sequence;
+	b->memory = e->planes[0].memory;
+	b->request_fd = e->request_fd;
+	b->timestamp.tv_sec = div64_u64_rem(e->timestamp, NSEC_PER_SEC, &nsecs);
+	b->timestamp.tv_usec = (u32)nsecs / NSEC_PER_USEC;
+
+	if (mplane_cap) {
+		unsigned int i;
+
+		if (!planes || !planes_array_size)
+			return -EINVAL;
+
+		b->m.planes = planes;
+
+		if (e->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			b->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+		else
+			b->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+
+		for (i = 0; i < VIDEO_MAX_PLANES && i < planes_array_size &&
+			    e->planes[i].buffer_length; i++) {
+
+			if (e->planes[0].memory != e->planes[i].memory)
+				return -EINVAL;
+
+			if (e->planes[i].offset)
+				return -EINVAL;
+
+			memset(&b->m.planes[i], 0, sizeof(b->m.planes[i]));
+
+			if (b->memory == V4L2_MEMORY_MMAP)
+				b->m.planes[i].m.mem_offset = e->planes[i].m.mem_offset;
+			else if (b->memory == V4L2_MEMORY_DMABUF)
+				b->m.planes[i].m.fd = e->planes[i].m.dmabuf_fd;
+			else
+				b->m.planes[i].m.userptr = e->planes[i].m.userptr;
+
+			b->m.planes[i].bytesused = e->planes[i].plane_length;
+			b->m.planes[i].length = e->planes[i].buffer_length;
+		}
+		/* In multi-planar, length contain the number of planes */
+		b->length = i;
+	} else {
+		b->type = e->type;
+		b->bytesused = e->planes[0].plane_length;
+		b->length = e->planes[0].buffer_length;
+
+		if (e->planes[0].offset)
+			return -EINVAL;
+
+		if (b->memory == V4L2_MEMORY_MMAP)
+			b->m.offset = e->planes[0].m.mem_offset;
+		else if (b->memory == V4L2_MEMORY_DMABUF)
+			b->m.fd = e->planes[0].m.dmabuf_fd;
+		else
+			b->m.userptr = e->planes[0].m.userptr;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_ext_buffer_to_buffer);
+
+int v4l2_buffer_to_ext_buffer(const struct v4l2_buffer *b,
+			      struct v4l2_ext_buffer *e)
+{
+	memset(e, 0, sizeof(*e));
+
+	e->index = b->index;
+	e->flags = b->flags;
+	e->field = b->field;
+	e->sequence = b->sequence;
+	e->request_fd = b->request_fd;
+	e->timestamp = b->timestamp.tv_sec * NSEC_PER_SEC +
+		b->timestamp.tv_usec * NSEC_PER_USEC;
+	if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
+		unsigned int i;
+
+		if (!b->m.planes)
+			return -EINVAL;
+
+		if (b->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+			e->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+		else
+			e->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+
+		/* In multi-planar, length contain the number of planes */
+		for (i = 0; i < b->length; i++) {
+			if (b->memory == V4L2_MEMORY_MMAP)
+				e->planes[i].m.mem_offset = b->m.planes[i].m.mem_offset;
+			else if (b->memory == V4L2_MEMORY_DMABUF)
+				e->planes[i].m.dmabuf_fd = b->m.planes[i].m.fd;
+			else
+				e->planes[i].m.userptr = b->m.planes[i].m.userptr;
+
+			e->planes[i].memory = b->memory;
+			e->planes[i].buffer_length = b->m.planes[i].length;
+			e->planes[i].plane_length = b->m.planes[i].bytesused;
+			if (b->m.planes[i].data_offset)
+				pr_warn("Ignoring data_offset value %d\n",
+					b->m.planes[i].data_offset);
+		}
+	} else {
+		e->type = b->type;
+		e->planes[0].memory = b->memory;
+		e->planes[0].plane_length = b->bytesused;
+		e->planes[0].buffer_length = b->length;
+		if (b->memory == V4L2_MEMORY_MMAP)
+			e->planes[0].m.mem_offset = b->m.offset;
+		else if (b->memory == V4L2_MEMORY_DMABUF)
+			e->planes[0].m.dmabuf_fd = b->m.fd;
+		else
+			e->planes[0].m.userptr = b->m.userptr;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_buffer_to_ext_buffer);
+
 static int v4l_querycap(const struct v4l2_ioctl_ops *ops,
 				struct file *file, void *fh, void *arg)
 {
@@ -2473,31 +2639,112 @@ static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
 	return ops->vidioc_reqbufs(file, fh, p);
 }
 
+static int v4l_do_buf_op(int (*op)(struct file *, void *,
+				   struct v4l2_buffer *),
+			 int (*ext_op)(struct file *, void *,
+				       struct v4l2_ext_buffer *),
+			 struct file *file, void *fh, struct v4l2_buffer *b)
+{
+	struct v4l2_ext_buffer e;
+	int ret;
+
+	ret = check_fmt(file, b->type);
+	if (ret)
+		return ret;
+
+	if (op)
+		return op(file, fh, b);
+
+	ret = v4l2_buffer_to_ext_buffer(b, &e);
+	if (ret)
+		return ret;
+
+	ret = ext_op(file, fh, &e);
+	if (ret)
+		return ret;
+
+	v4l2_ext_buffer_to_buffer(&e, b, V4L2_TYPE_IS_MULTIPLANAR(b->type));
+	return 0;
+}
+
+static int v4l_do_ext_buf_op(int (*op)(struct file *, void *,
+				       struct v4l2_buffer *),
+			     int (*ext_op)(struct file *, void *,
+					   struct v4l2_ext_buffer *),
+			     struct file *file, void *fh,
+			     struct v4l2_ext_buffer *e)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct v4l2_plane planes[VIDEO_MAX_PLANES];
+	struct v4l2_buffer b;
+	bool mplane_cap;
+	int ret;
+
+	ret = check_fmt(file, e->type);
+	if (ret)
+		return ret;
+
+	if (ext_op)
+		return ext_op(file, fh, e);
+
+	mplane_cap = !!(vdev->device_caps &
+			(V4L2_CAP_VIDEO_CAPTURE_MPLANE |
+			 V4L2_CAP_VIDEO_OUTPUT_MPLANE |
+			 V4L2_CAP_VIDEO_M2M_MPLANE));
+	b.m.planes = planes;
+	b.length = VIDEO_MAX_PLANES;
+	ret = v4l2_ext_buffer_to_buffer(e, &b, mplane_cap);
+	if (ret)
+		return ret;
+
+	ret = op(file, fh, &b);
+	if (ret)
+		return ret;
+
+	v4l2_buffer_to_ext_buffer(&b, e);
+	return 0;
+}
+
 static int v4l_querybuf(const struct v4l2_ioctl_ops *ops,
-				struct file *file, void *fh, void *arg)
+			struct file *file, void *fh, void *arg)
 {
-	struct v4l2_buffer *p = arg;
-	int ret = check_fmt(file, p->type);
+	return v4l_do_buf_op(ops->vidioc_querybuf, ops->vidioc_ext_querybuf,
+			     file, fh, arg);
+}
 
-	return ret ? ret : ops->vidioc_querybuf(file, fh, p);
+static int v4l_ext_querybuf(const struct v4l2_ioctl_ops *ops,
+			    struct file *file, void *fh, void *arg)
+{
+	return v4l_do_ext_buf_op(ops->vidioc_querybuf,
+				 ops->vidioc_ext_querybuf, file, fh, arg);
 }
 
 static int v4l_qbuf(const struct v4l2_ioctl_ops *ops,
-				struct file *file, void *fh, void *arg)
+		    struct file *file, void *fh, void *arg)
 {
-	struct v4l2_buffer *p = arg;
-	int ret = check_fmt(file, p->type);
+	return v4l_do_buf_op(ops->vidioc_qbuf, ops->vidioc_ext_qbuf,
+			     file, fh, arg);
+}
 
-	return ret ? ret : ops->vidioc_qbuf(file, fh, p);
+static int v4l_ext_qbuf(const struct v4l2_ioctl_ops *ops,
+			struct file *file, void *fh, void *arg)
+{
+	return v4l_do_ext_buf_op(ops->vidioc_qbuf, ops->vidioc_ext_qbuf,
+				 file, fh, arg);
 }
 
 static int v4l_dqbuf(const struct v4l2_ioctl_ops *ops,
-				struct file *file, void *fh, void *arg)
+		     struct file *file, void *fh, void *arg)
 {
-	struct v4l2_buffer *p = arg;
-	int ret = check_fmt(file, p->type);
+	return v4l_do_buf_op(ops->vidioc_dqbuf, ops->vidioc_ext_dqbuf,
+			     file, fh, arg);
+}
 
-	return ret ? ret : ops->vidioc_dqbuf(file, fh, p);
+static int v4l_ext_dqbuf(const struct v4l2_ioctl_ops *ops,
+			 struct file *file, void *fh, void *arg)
+{
+	return v4l_do_ext_buf_op(ops->vidioc_dqbuf, ops->vidioc_ext_dqbuf,
+				 file, fh, arg);
 }
 
 static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
@@ -2513,7 +2760,27 @@ static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
 
 	v4l_sanitize_format(&create->format);
 
-	ret = ops->vidioc_create_bufs(file, fh, create);
+	if (ops->vidioc_create_bufs) {
+		ret = ops->vidioc_create_bufs(file, fh, create);
+	} else {
+		struct v4l2_ext_create_buffers ecreate = {
+			.count = create->count,
+			.memory = create->memory,
+		};
+
+		ret = v4l2_format_to_ext_pix_format(&create->format,
+						    &ecreate.format, true);
+		if (ret)
+			return ret;
+
+		ret = ops->vidioc_ext_create_bufs(file, fh, &ecreate);
+		if (ret)
+			return ret;
+
+		create->index = ecreate.index;
+		create->count = ecreate.count;
+		create->capabilities = ecreate.capabilities;
+	}
 
 	if (create->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 	    create->format.type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
@@ -2522,13 +2789,60 @@ static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
 	return ret;
 }
 
+static int v4l_ext_create_bufs(const struct v4l2_ioctl_ops *ops,
+			       struct file *file, void *fh, void *arg)
+{
+	struct v4l2_ext_create_buffers *ecreate = arg;
+	struct video_device *vdev = video_devdata(file);
+	struct v4l2_create_buffers create = {
+		.count = ecreate->count,
+		.memory = ecreate->memory,
+		.flags = ecreate->flags,
+	};
+	bool mplane_cap;
+	int ret;
+
+	ret = check_fmt(file, ecreate->format.type);
+	if (ret)
+		return ret;
+
+	if (ops->vidioc_ext_create_bufs)
+		return ops->vidioc_ext_create_bufs(file, fh, ecreate);
+
+	mplane_cap = !!(vdev->device_caps &
+			(V4L2_CAP_VIDEO_CAPTURE_MPLANE |
+			 V4L2_CAP_VIDEO_OUTPUT_MPLANE |
+			 V4L2_CAP_VIDEO_M2M_MPLANE));
+	ret = v4l2_ext_pix_format_to_format(&ecreate->format,
+					    &create.format, mplane_cap, true);
+	if (ret)
+		return ret;
+
+	ret = v4l_create_bufs(ops, file, fh, &create);
+	if (ret)
+		return ret;
+
+	ecreate->index = create.index;
+	ecreate->count = create.count;
+	ecreate->capabilities = create.capabilities;
+
+	return 0;
+}
+
 static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops,
-				struct file *file, void *fh, void *arg)
+			   struct file *file, void *fh, void *arg)
 {
-	struct v4l2_buffer *b = arg;
-	int ret = check_fmt(file, b->type);
+	return v4l_do_buf_op(ops->vidioc_prepare_buf,
+			     ops->vidioc_ext_prepare_buf,
+			     file, fh, arg);
+}
 
-	return ret ? ret : ops->vidioc_prepare_buf(file, fh, b);
+static int v4l_ext_prepare_buf(const struct v4l2_ioctl_ops *ops,
+			       struct file *file, void *fh, void *arg)
+{
+	return v4l_do_ext_buf_op(ops->vidioc_prepare_buf,
+				 ops->vidioc_ext_prepare_buf,
+				 file, fh, arg);
 }
 
 static int v4l_g_parm(const struct v4l2_ioctl_ops *ops,
@@ -3202,12 +3516,15 @@ static const struct v4l2_ioctl_info v4l2_ioctls[] = {
 	IOCTL_INFO(VIDIOC_S_EXT_PIX_FMT, v4l_s_ext_pix_fmt, v4l_print_ext_pix_format, INFO_FL_PRIO),
 	IOCTL_INFO(VIDIOC_REQBUFS, v4l_reqbufs, v4l_print_requestbuffers, INFO_FL_PRIO | INFO_FL_QUEUE),
 	IOCTL_INFO(VIDIOC_QUERYBUF, v4l_querybuf, v4l_print_buffer, INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_buffer, length)),
+	IOCTL_INFO(VIDIOC_EXT_QUERYBUF, v4l_ext_querybuf, v4l_print_ext_buffer, INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_ext_buffer, planes)),
 	IOCTL_INFO(VIDIOC_G_FBUF, v4l_stub_g_fbuf, v4l_print_framebuffer, 0),
 	IOCTL_INFO(VIDIOC_S_FBUF, v4l_stub_s_fbuf, v4l_print_framebuffer, INFO_FL_PRIO),
 	IOCTL_INFO(VIDIOC_OVERLAY, v4l_overlay, v4l_print_u32, INFO_FL_PRIO),
 	IOCTL_INFO(VIDIOC_QBUF, v4l_qbuf, v4l_print_buffer, INFO_FL_QUEUE),
 	IOCTL_INFO(VIDIOC_EXPBUF, v4l_stub_expbuf, v4l_print_exportbuffer, INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_exportbuffer, flags)),
+	IOCTL_INFO(VIDIOC_EXT_QBUF, v4l_ext_qbuf, v4l_print_ext_buffer, INFO_FL_QUEUE),
 	IOCTL_INFO(VIDIOC_DQBUF, v4l_dqbuf, v4l_print_buffer, INFO_FL_QUEUE),
+	IOCTL_INFO(VIDIOC_EXT_DQBUF, v4l_ext_dqbuf, v4l_print_ext_buffer, INFO_FL_QUEUE),
 	IOCTL_INFO(VIDIOC_STREAMON, v4l_streamon, v4l_print_buftype, INFO_FL_PRIO | INFO_FL_QUEUE),
 	IOCTL_INFO(VIDIOC_STREAMOFF, v4l_streamoff, v4l_print_buftype, INFO_FL_PRIO | INFO_FL_QUEUE),
 	IOCTL_INFO(VIDIOC_G_PARM, v4l_g_parm, v4l_print_streamparm, INFO_FL_CLEAR(v4l2_streamparm, type)),
@@ -3272,7 +3589,9 @@ static const struct v4l2_ioctl_info v4l2_ioctls[] = {
 	IOCTL_INFO(VIDIOC_SUBSCRIBE_EVENT, v4l_subscribe_event, v4l_print_event_subscription, 0),
 	IOCTL_INFO(VIDIOC_UNSUBSCRIBE_EVENT, v4l_unsubscribe_event, v4l_print_event_subscription, 0),
 	IOCTL_INFO(VIDIOC_CREATE_BUFS, v4l_create_bufs, v4l_print_create_buffers, INFO_FL_PRIO | INFO_FL_QUEUE),
+	IOCTL_INFO(VIDIOC_EXT_CREATE_BUFS, v4l_ext_create_bufs, v4l_print_ext_create_buffers, INFO_FL_PRIO | INFO_FL_QUEUE),
 	IOCTL_INFO(VIDIOC_PREPARE_BUF, v4l_prepare_buf, v4l_print_buffer, INFO_FL_QUEUE),
+	IOCTL_INFO(VIDIOC_EXT_PREPARE_BUF, v4l_ext_prepare_buf, v4l_print_ext_buffer, INFO_FL_QUEUE),
 	IOCTL_INFO(VIDIOC_ENUM_DV_TIMINGS, v4l_stub_enum_dv_timings, v4l_print_enum_dv_timings, INFO_FL_CLEAR(v4l2_enum_dv_timings, pad)),
 	IOCTL_INFO(VIDIOC_QUERY_DV_TIMINGS, v4l_stub_query_dv_timings, v4l_print_dv_timings, INFO_FL_ALWAYS_COPY),
 	IOCTL_INFO(VIDIOC_DV_TIMINGS_CAP, v4l_stub_dv_timings_cap, v4l_print_dv_timings_cap, INFO_FL_CLEAR(v4l2_dv_timings_cap, pad)),
diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index 8bbcb74d8ee31..75996657ad1ba 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -169,16 +169,26 @@ struct v4l2_fh;
  *	:ref:`VIDIOC_REQBUFS <vidioc_reqbufs>` ioctl
  * @vidioc_querybuf: pointer to the function that implements
  *	:ref:`VIDIOC_QUERYBUF <vidioc_querybuf>` ioctl
+ * @vidioc_ext_querybuf: pointer to the function that implements
+ *	:ref:`VIDIOC_EXT_QUERYBUF <vidioc_ext_querybuf>` ioctl
  * @vidioc_qbuf: pointer to the function that implements
  *	:ref:`VIDIOC_QBUF <vidioc_qbuf>` ioctl
+ * @vidioc_ext_qbuf: pointer to the function that implements
+ *	:ref:`VIDIOC_EXT_QBUF <vidioc_ext_qbuf>` ioctl
  * @vidioc_expbuf: pointer to the function that implements
  *	:ref:`VIDIOC_EXPBUF <vidioc_expbuf>` ioctl
  * @vidioc_dqbuf: pointer to the function that implements
  *	:ref:`VIDIOC_DQBUF <vidioc_qbuf>` ioctl
+ * @vidioc_ext_dqbuf: pointer to the function that implements
+ *	:ref:`VIDIOC_EXT_DQBUF <vidioc_ext_qbuf>` ioctl
  * @vidioc_create_bufs: pointer to the function that implements
  *	:ref:`VIDIOC_CREATE_BUFS <vidioc_create_bufs>` ioctl
+ * @vidioc_ext_create_bufs: pointer to the function that implements
+ *	:ref:`VIDIOC_EXT_CREATE_BUFS <vidioc_ext_create_bufs>` ioctl
  * @vidioc_prepare_buf: pointer to the function that implements
  *	:ref:`VIDIOC_PREPARE_BUF <vidioc_prepare_buf>` ioctl
+ * @vidioc_ext_prepare_buf: pointer to the function that implements
+ *	:ref:`VIDIOC_EXT_PREPARE_BUF <vidioc_ext_prepare_buf>` ioctl
  * @vidioc_overlay: pointer to the function that implements
  *	:ref:`VIDIOC_OVERLAY <vidioc_overlay>` ioctl
  * @vidioc_g_fbuf: pointer to the function that implements
@@ -439,17 +449,27 @@ struct v4l2_ioctl_ops {
 			      struct v4l2_requestbuffers *b);
 	int (*vidioc_querybuf)(struct file *file, void *fh,
 			       struct v4l2_buffer *b);
+	int (*vidioc_ext_querybuf)(struct file *file, void *fh,
+				   struct v4l2_ext_buffer *b);
 	int (*vidioc_qbuf)(struct file *file, void *fh,
 			   struct v4l2_buffer *b);
+	int (*vidioc_ext_qbuf)(struct file *file, void *fh,
+			       struct v4l2_ext_buffer *b);
 	int (*vidioc_expbuf)(struct file *file, void *fh,
 			     struct v4l2_exportbuffer *e);
 	int (*vidioc_dqbuf)(struct file *file, void *fh,
 			    struct v4l2_buffer *b);
+	int (*vidioc_ext_dqbuf)(struct file *file, void *fh,
+				struct v4l2_ext_buffer *b);
 
 	int (*vidioc_create_bufs)(struct file *file, void *fh,
 				  struct v4l2_create_buffers *b);
+	int (*vidioc_ext_create_bufs)(struct file *file, void *fh,
+				      struct v4l2_ext_create_buffers *b);
 	int (*vidioc_prepare_buf)(struct file *file, void *fh,
 				  struct v4l2_buffer *b);
+	int (*vidioc_ext_prepare_buf)(struct file *file, void *fh,
+				      struct v4l2_ext_buffer *b);
 
 	int (*vidioc_overlay)(struct file *file, void *fh, unsigned int i);
 	int (*vidioc_g_fbuf)(struct file *file, void *fh,
@@ -758,6 +778,12 @@ int v4l2_ext_pix_format_to_format(const struct v4l2_ext_pix_format *e,
 				  struct v4l2_format *f,
 				  bool mplane_cap, bool strict);
 
+int v4l2_ext_buffer_to_buffer(const struct v4l2_ext_buffer *e,
+			      struct v4l2_buffer *b,
+			      bool mplane_cap);
+int v4l2_buffer_to_ext_buffer(const struct v4l2_buffer *b,
+			      struct v4l2_ext_buffer *e);
+
 /*
  * The user space interpretation of the 'v4l2_event' differs
  * based on the 'time_t' definition on 32-bit architectures, so
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 7123c6a4d9569..334cafdd2be97 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -996,6 +996,41 @@ struct v4l2_plane {
 	__u32			reserved[11];
 };
 
+/**
+ * struct v4l2_ext_plane - extended plane buffer info
+ * @buffer_length:	size of the entire buffer in bytes, should fit
+ *			@offset + @plane_length
+ * @plane_length:	size of the plane in bytes.
+ * @mem_offset:		If V4L2_MEMORY_MMAP is used, then it can be a "cookie"
+ *			that should be passed to mmap() called on the video node.
+ * @userptr:		when memory is V4L2_MEMORY_USERPTR, a userspace pointer pointing
+ *			to this plane.
+ * @dmabuf_fd:		when memory is V4L2_MEMORY_DMABUF, a userspace file descriptor
+ *			associated with this plane.
+ * @offset:		offset in the memory buffer where the plane starts.
+ * @memory:		enum v4l2_memory; the method, in which the actual video
+ *			data is passed
+ * @reserved:		extra space reserved for future fields, must be set to 0.
+ *
+ *
+ * Buffers consist of one or more planes, e.g. an YCbCr buffer with two planes
+ * can have one plane for Y, and another for interleaved CbCr components.
+ * Each plane can reside in a separate memory buffer, or even in
+ * a completely separate memory node (e.g. in embedded devices).
+ */
+struct v4l2_ext_plane {
+	__u32 buffer_length;
+	__u32 plane_length;
+	union {
+		__u32 mem_offset;
+		__u64 userptr;
+		__s32 dmabuf_fd;
+	} m;
+	__u32 offset;
+	__u32 memory;
+	__u32 reserved[4];
+};
+
 /**
  * struct v4l2_buffer - video buffer info
  * @index:	id number of the buffer
@@ -1057,6 +1092,33 @@ struct v4l2_buffer {
 	};
 };
 
+/**
+ * struct v4l2_ext_buffer - extended video buffer info
+ * @index:	id number of the buffer
+ * @type:	V4L2_BUF_TYPE_VIDEO_CAPTURE or V4L2_BUF_TYPE_VIDEO_OUTPUT
+ * @flags:	buffer informational flags
+ * @field:	enum v4l2_field; field order of the image in the buffer
+ * @timestamp:	frame timestamp
+ * @sequence:	sequence count of this frame
+ * @planes:	per-plane buffer information
+ * @request_fd:	fd of the request that this buffer should use
+ * @reserved:	extra space reserved for future fields, must be set to 0
+ *
+ * Contains data exchanged by application and driver using one of the Streaming
+ * I/O methods.
+ */
+struct v4l2_ext_buffer {
+	__u32 index;
+	__u32 type;
+	__u32 field;
+	__u32 sequence;
+	__u64 flags;
+	__u64 timestamp;
+	struct v4l2_ext_plane planes[VIDEO_MAX_PLANES];
+	__s32 request_fd;
+	__u32 reserved[9];
+};
+
 #ifndef __KERNEL__
 /**
  * v4l2_timeval_to_ns - Convert timeval to nanoseconds
@@ -2523,6 +2585,29 @@ struct v4l2_create_buffers {
 	__u32			reserved[6];
 };
 
+/**
+ * struct v4l2_ext_create_buffers - VIDIOC_EXT_CREATE_BUFS argument
+ * @index:	on return, index of the first created buffer
+ * @count:	entry: number of requested buffers,
+ *		return: number of created buffers
+ * @memory:	enum v4l2_memory; buffer memory type
+ * @capabilities: capabilities of this buffer type.
+ * @format:	frame format, for which buffers are requested
+ * @flags:	additional buffer management attributes (ignored unless the
+ *		queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability
+ *		and configured for MMAP streaming I/O).
+ * @reserved:	extra space reserved for future fields, must be set to 0
+ */
+struct v4l2_ext_create_buffers {
+	__u32				index;
+	__u32				count;
+	__u32				memory;
+	__u32				capabilities;
+	struct v4l2_ext_pix_format	format;
+	__u32				flags;
+	__u32 reserved[5];
+};
+
 /*
  *	I O C T L   C O D E S   F O R   V I D E O   D E V I C E S
  *
@@ -2626,6 +2711,11 @@ struct v4l2_create_buffers {
 #define VIDIOC_G_EXT_PIX_FMT	_IOWR('V', 104, struct v4l2_ext_pix_format)
 #define VIDIOC_S_EXT_PIX_FMT	_IOWR('V', 105, struct v4l2_ext_pix_format)
 #define VIDIOC_TRY_EXT_PIX_FMT	_IOWR('V', 106, struct v4l2_ext_pix_format)
+#define VIDIOC_EXT_CREATE_BUFS	_IOWR('V', 107, struct v4l2_ext_create_buffers)
+#define VIDIOC_EXT_QUERYBUF	_IOWR('V', 108, struct v4l2_ext_buffer)
+#define VIDIOC_EXT_QBUF		_IOWR('V', 109, struct v4l2_ext_buffer)
+#define VIDIOC_EXT_DQBUF	_IOWR('V', 110, struct v4l2_ext_buffer)
+#define VIDIOC_EXT_PREPARE_BUF	_IOWR('V', 111, struct v4l2_ext_buffer)
 
 /* Reminder: when adding new ioctls please add support for them to
    drivers/media/v4l2-core/v4l2-compat-ioctl32.c as well! */
-- 
2.28.0.rc2