[PATCHv2,7/8] videobuf2: handle V4L2_MEMORY_FLAG_NON_COHERENT flag
Commit Message
This patch lets user-space to request a non-coherent memory
allocation during CREATE_BUFS and REQBUFS ioctl calls.
= CREATE_BUFS
struct v4l2_create_buffers has seven 4-byte reserved areas,
so reserved[0] is renamed to ->flags. The struct, thus, now
has six reserved 4-byte regions.
= CREATE_BUFS32
struct v4l2_create_buffers32 has seven 4-byte reserved areas,
so reserved[0] is renamed to ->flags. The struct, thus, now
has six reserved 4-byte regions.
= REQBUFS
We use one byte of a 4 byte ->reserved[1] member of struct
v4l2_requestbuffers. The struct, thus, now has reserved 3 bytes.
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
---
.../media/v4l/vidioc-create-bufs.rst | 7 ++++-
.../media/v4l/vidioc-reqbufs.rst | 12 +++++---
.../media/common/videobuf2/videobuf2-core.c | 4 +--
.../media/common/videobuf2/videobuf2-v4l2.c | 28 +++++++++++++++++--
drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 9 +++++-
drivers/media/v4l2-core/v4l2-ioctl.c | 5 +---
include/uapi/linux/videodev2.h | 9 ++++--
7 files changed, 57 insertions(+), 17 deletions(-)
Comments
On (21/04/27 22:13), Sergey Senozhatsky wrote:
[..]
> diff --git a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
> index e59306aba2b0..5a047c0ec3e8 100644
> --- a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
> +++ b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
> @@ -104,10 +104,14 @@ aborting or finishing any DMA in progress, an implicit
> ``V4L2_MEMORY_MMAP`` and ``type`` set to the buffer type. This will
> free any previously allocated buffers, so this is typically something
> that will be done at the start of the application.
> - * - __u32
> - - ``reserved``\ [1]
> - - A place holder for future extensions. Drivers and applications
> - must set the array to zero.
> + * - __u8
> + - ``flags``
> + - Specifies additional buffer management attributes.
> + See :ref:`memory-flags`.
> + * - __u8
> + - ``reserved``\ [3]
> + - Reserved for future extensions.
> + -
A fix (one liner). Sorry.
---
Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst | 1 -
1 file changed, 1 deletion(-)
diff --git a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
index 5a047c0ec3e8..099fa6695167 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
@@ -111,7 +111,6 @@ aborting or finishing any DMA in progress, an implicit
* - __u8
- ``reserved``\ [3]
- Reserved for future extensions.
- -
.. _v4l2-buf-capabilities:
.. _V4L2-BUF-CAP-SUPPORTS-MMAP:
Hi Sergey,
Some comments below:
On 27/04/2021 15:13, Sergey Senozhatsky wrote:
> This patch lets user-space to request a non-coherent memory
> allocation during CREATE_BUFS and REQBUFS ioctl calls.
>
> = CREATE_BUFS
>
> struct v4l2_create_buffers has seven 4-byte reserved areas,
> so reserved[0] is renamed to ->flags. The struct, thus, now
> has six reserved 4-byte regions.
>
> = CREATE_BUFS32
>
> struct v4l2_create_buffers32 has seven 4-byte reserved areas,
> so reserved[0] is renamed to ->flags. The struct, thus, now
> has six reserved 4-byte regions.
>
> = REQBUFS
>
> We use one byte of a 4 byte ->reserved[1] member of struct
> v4l2_requestbuffers. The struct, thus, now has reserved 3 bytes.
>
> Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
> ---
> .../media/v4l/vidioc-create-bufs.rst | 7 ++++-
> .../media/v4l/vidioc-reqbufs.rst | 12 +++++---
> .../media/common/videobuf2/videobuf2-core.c | 4 +--
> .../media/common/videobuf2/videobuf2-v4l2.c | 28 +++++++++++++++++--
> drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 9 +++++-
> drivers/media/v4l2-core/v4l2-ioctl.c | 5 +---
> include/uapi/linux/videodev2.h | 9 ++++--
> 7 files changed, 57 insertions(+), 17 deletions(-)
>
> diff --git a/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst b/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst
> index f98f18c9e91c..a048a9f6b7b6 100644
> --- a/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst
> +++ b/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst
> @@ -113,7 +113,12 @@ than the number requested.
> ``V4L2_MEMORY_MMAP`` and ``format.type`` to the buffer type.
>
> * - __u32
> - - ``reserved``\ [7]
> + - ``flags``
> + - Specifies additional buffer management attributes.
> + See :ref:`memory-flags`.
> +
> + * - __u32
> + - ``reserved``\ [6]
> - A place holder for future extensions. Drivers and applications
> must set the array to zero.
>
> diff --git a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
> index e59306aba2b0..5a047c0ec3e8 100644
> --- a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
> +++ b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
> @@ -104,10 +104,14 @@ aborting or finishing any DMA in progress, an implicit
> ``V4L2_MEMORY_MMAP`` and ``type`` set to the buffer type. This will
> free any previously allocated buffers, so this is typically something
> that will be done at the start of the application.
> - * - __u32
> - - ``reserved``\ [1]
> - - A place holder for future extensions. Drivers and applications
> - must set the array to zero.
> + * - __u8
> + - ``flags``
> + - Specifies additional buffer management attributes.
> + See :ref:`memory-flags`.
> + * - __u8
> + - ``reserved``\ [3]
> + - Reserved for future extensions.
> + -
>
> .. _v4l2-buf-capabilities:
> .. _V4L2-BUF-CAP-SUPPORTS-MMAP:
> diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
> index af4db310cf5e..38505783247e 100644
> --- a/drivers/media/common/videobuf2/videobuf2-core.c
> +++ b/drivers/media/common/videobuf2/videobuf2-core.c
> @@ -762,7 +762,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
> {
> unsigned int num_buffers, allocated_buffers, num_planes = 0;
> unsigned plane_sizes[VB2_MAX_PLANES] = { };
> - bool coherent_mem = true;
> + bool coherent_mem = !(flags & V4L2_MEMORY_FLAG_NON_COHERENT);
> unsigned int i;
> int ret;
>
> @@ -906,7 +906,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
> {
> unsigned int num_planes = 0, num_buffers, allocated_buffers;
> unsigned plane_sizes[VB2_MAX_PLANES] = { };
> - bool coherent_mem = true;
> + bool coherent_mem = !(flags & V4L2_MEMORY_FLAG_NON_COHERENT);
> int ret;
>
> if (q->num_buffers == VB2_MAX_FRAME) {
> diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
> index 1166d5a9291a..8d344335552e 100644
> --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
> +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
> @@ -692,12 +692,29 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
> #endif
> }
>
> +static void validate_memory_flags(struct vb2_queue *q,
> + int memory,
> + u32 *flags)
> +{
> + if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) {
> + /*
> + * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only,
> + * but in order to avoid bugs we zero out all bits.
> + */
> + *flags = 0;
Wouldn't it make sense to add:
} else {
*flags &= ~V4L2_MEMORY_FLAG_NON_COHERENT;
I.e., clear all unknown flags.
> + }
> +}
> +
> int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
> {
> int ret = vb2_verify_memory_type(q, req->memory, req->type);
> + u32 flags = req->flags;
>
> fill_buf_caps(q, &req->capabilities);
> - return ret ? ret : vb2_core_reqbufs(q, req->memory, 0, &req->count);
> + validate_memory_flags(q, req->memory, &flags);
> + req->flags = flags;
> + return ret ? ret : vb2_core_reqbufs(q, req->memory,
> + req->flags, &req->count);
> }
> EXPORT_SYMBOL_GPL(vb2_reqbufs);
>
> @@ -729,6 +746,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
> unsigned i;
>
> fill_buf_caps(q, &create->capabilities);
> + validate_memory_flags(q, create->memory, &create->flags);
> create->index = q->num_buffers;
> if (create->count == 0)
> return ret != -EBUSY ? ret : 0;
> @@ -772,7 +790,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
> if (requested_sizes[i] == 0)
> return -EINVAL;
> return ret ? ret : vb2_core_create_bufs(q, create->memory,
> - 0,
> + create->flags,
> &create->count,
> requested_planes,
> requested_sizes);
> @@ -955,13 +973,16 @@ int vb2_ioctl_reqbufs(struct file *file, void *priv,
> {
> struct video_device *vdev = video_devdata(file);
> int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type);
> + u32 flags = p->flags;
>
> fill_buf_caps(vdev->queue, &p->capabilities);
> + validate_memory_flags(vdev->queue, p->memory, &flags);
> + p->flags = flags;
> if (res)
> return res;
> if (vb2_queue_is_busy(vdev, file))
> return -EBUSY;
> - res = vb2_core_reqbufs(vdev->queue, p->memory, 0, &p->count);
> + res = vb2_core_reqbufs(vdev->queue, p->memory, p->flags, &p->count);
> /* If count == 0, then the owner has released all buffers and he
> is no longer owner of the queue. Otherwise we have a new owner. */
> if (res == 0)
> @@ -979,6 +1000,7 @@ int vb2_ioctl_create_bufs(struct file *file, void *priv,
>
> p->index = vdev->queue->num_buffers;
> fill_buf_caps(vdev->queue, &p->capabilities);
> + validate_memory_flags(vdev->queue, p->memory, &p->flags);
> /*
> * If count == 0, then just check if memory and type are valid.
> * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0.
> diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> index 0ca75f6784c5..1aa9ca3b6ca4 100644
> --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> @@ -126,6 +126,9 @@ struct v4l2_format32 {
> * @memory: buffer memory type
> * @format: frame format, for which buffers are requested
> * @capabilities: capabilities of this buffer type.
> + * @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: future extensions
> */
> struct v4l2_create_buffers32 {
> @@ -134,7 +137,8 @@ struct v4l2_create_buffers32 {
> __u32 memory; /* enum v4l2_memory */
> struct v4l2_format32 format;
> __u32 capabilities;
> - __u32 reserved[7];
> + __u32 flags;
> + __u32 reserved[6];
> };
>
> static int get_v4l2_format32(struct v4l2_format *p64,
> @@ -182,6 +186,8 @@ static int get_v4l2_create32(struct v4l2_create_buffers *p64,
> if (copy_from_user(p64, p32,
> offsetof(struct v4l2_create_buffers32, format)))
> return -EFAULT;
> + if (copy_from_user(&p64->flags, &p32->flags, sizeof(p32->flags)))
> + return -EFAULT;
> return get_v4l2_format32(&p64->format, &p32->format);
> }
>
> @@ -227,6 +233,7 @@ static int put_v4l2_create32(struct v4l2_create_buffers *p64,
> if (copy_to_user(p32, p64,
> offsetof(struct v4l2_create_buffers32, format)) ||
> put_user(p64->capabilities, &p32->capabilities) ||
> + put_user(p64->flags, &p32->flags) ||
> copy_to_user(p32->reserved, p64->reserved, sizeof(p64->reserved)))
> return -EFAULT;
> return put_v4l2_format32(&p64->format, &p32->format);
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 2673f51aafa4..b1430a741936 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -2003,9 +2003,6 @@ static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
>
> if (ret)
> return ret;
> -
> - CLEAR_AFTER_FIELD(p, capabilities);
Shouldn't this be:
CLEAR_AFTER_FIELD(p, flags);
You still need to zero the reserved array, after all.
> -
> return ops->vidioc_reqbufs(file, fh, p);
> }
>
> @@ -2045,7 +2042,7 @@ static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
> if (ret)
> return ret;
>
> - CLEAR_AFTER_FIELD(create, capabilities);
> + CLEAR_AFTER_FIELD(create, flags);
>
> v4l_sanitize_format(&create->format);
>
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 15f9c9df35d5..d62a6e4f83a0 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -953,7 +953,8 @@ struct v4l2_requestbuffers {
> __u32 type; /* enum v4l2_buf_type */
> __u32 memory; /* enum v4l2_memory */
> __u32 capabilities;
> - __u32 reserved[1];
> + __u8 flags;
> + __u8 reserved[3];
> };
>
> #define V4L2_MEMORY_FLAG_NON_COHERENT (1 << 0)
> @@ -2494,6 +2495,9 @@ struct v4l2_dbg_chip_info {
> * @memory: enum v4l2_memory; buffer memory type
> * @format: frame format, for which buffers are requested
> * @capabilities: capabilities of this buffer type.
> + * @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: future extensions
> */
> struct v4l2_create_buffers {
> @@ -2502,7 +2506,8 @@ struct v4l2_create_buffers {
> __u32 memory;
> struct v4l2_format format;
> __u32 capabilities;
> - __u32 reserved[7];
> + __u32 flags;
> + __u32 reserved[6];
> };
>
> /*
>
Regards,
Hans
On (21/06/03 13:32), Hans Verkuil wrote:
[..]
> > +static void validate_memory_flags(struct vb2_queue *q,
> > + int memory,
> > + u32 *flags)
> > +{
> > + if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) {
> > + /*
> > + * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only,
> > + * but in order to avoid bugs we zero out all bits.
> > + */
> > + *flags = 0;
>
> Wouldn't it make sense to add:
>
> } else {
> *flags &= ~V4L2_MEMORY_FLAG_NON_COHERENT;
>
> I.e., clear all unknown flags.
Done.
[..]
> > @@ -2003,9 +2003,6 @@ static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
> >
> > if (ret)
> > return ret;
> > -
> > - CLEAR_AFTER_FIELD(p, capabilities);
>
> Shouldn't this be:
>
> CLEAR_AFTER_FIELD(p, flags);
>
> You still need to zero the reserved array, after all.
Done.
@@ -113,7 +113,12 @@ than the number requested.
``V4L2_MEMORY_MMAP`` and ``format.type`` to the buffer type.
* - __u32
- - ``reserved``\ [7]
+ - ``flags``
+ - Specifies additional buffer management attributes.
+ See :ref:`memory-flags`.
+
+ * - __u32
+ - ``reserved``\ [6]
- A place holder for future extensions. Drivers and applications
must set the array to zero.
@@ -104,10 +104,14 @@ aborting or finishing any DMA in progress, an implicit
``V4L2_MEMORY_MMAP`` and ``type`` set to the buffer type. This will
free any previously allocated buffers, so this is typically something
that will be done at the start of the application.
- * - __u32
- - ``reserved``\ [1]
- - A place holder for future extensions. Drivers and applications
- must set the array to zero.
+ * - __u8
+ - ``flags``
+ - Specifies additional buffer management attributes.
+ See :ref:`memory-flags`.
+ * - __u8
+ - ``reserved``\ [3]
+ - Reserved for future extensions.
+ -
.. _v4l2-buf-capabilities:
.. _V4L2-BUF-CAP-SUPPORTS-MMAP:
@@ -762,7 +762,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
{
unsigned int num_buffers, allocated_buffers, num_planes = 0;
unsigned plane_sizes[VB2_MAX_PLANES] = { };
- bool coherent_mem = true;
+ bool coherent_mem = !(flags & V4L2_MEMORY_FLAG_NON_COHERENT);
unsigned int i;
int ret;
@@ -906,7 +906,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
{
unsigned int num_planes = 0, num_buffers, allocated_buffers;
unsigned plane_sizes[VB2_MAX_PLANES] = { };
- bool coherent_mem = true;
+ bool coherent_mem = !(flags & V4L2_MEMORY_FLAG_NON_COHERENT);
int ret;
if (q->num_buffers == VB2_MAX_FRAME) {
@@ -692,12 +692,29 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
#endif
}
+static void validate_memory_flags(struct vb2_queue *q,
+ int memory,
+ u32 *flags)
+{
+ if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) {
+ /*
+ * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only,
+ * but in order to avoid bugs we zero out all bits.
+ */
+ *flags = 0;
+ }
+}
+
int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
{
int ret = vb2_verify_memory_type(q, req->memory, req->type);
+ u32 flags = req->flags;
fill_buf_caps(q, &req->capabilities);
- return ret ? ret : vb2_core_reqbufs(q, req->memory, 0, &req->count);
+ validate_memory_flags(q, req->memory, &flags);
+ req->flags = flags;
+ return ret ? ret : vb2_core_reqbufs(q, req->memory,
+ req->flags, &req->count);
}
EXPORT_SYMBOL_GPL(vb2_reqbufs);
@@ -729,6 +746,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
unsigned i;
fill_buf_caps(q, &create->capabilities);
+ validate_memory_flags(q, create->memory, &create->flags);
create->index = q->num_buffers;
if (create->count == 0)
return ret != -EBUSY ? ret : 0;
@@ -772,7 +790,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
if (requested_sizes[i] == 0)
return -EINVAL;
return ret ? ret : vb2_core_create_bufs(q, create->memory,
- 0,
+ create->flags,
&create->count,
requested_planes,
requested_sizes);
@@ -955,13 +973,16 @@ int vb2_ioctl_reqbufs(struct file *file, void *priv,
{
struct video_device *vdev = video_devdata(file);
int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type);
+ u32 flags = p->flags;
fill_buf_caps(vdev->queue, &p->capabilities);
+ validate_memory_flags(vdev->queue, p->memory, &flags);
+ p->flags = flags;
if (res)
return res;
if (vb2_queue_is_busy(vdev, file))
return -EBUSY;
- res = vb2_core_reqbufs(vdev->queue, p->memory, 0, &p->count);
+ res = vb2_core_reqbufs(vdev->queue, p->memory, p->flags, &p->count);
/* If count == 0, then the owner has released all buffers and he
is no longer owner of the queue. Otherwise we have a new owner. */
if (res == 0)
@@ -979,6 +1000,7 @@ int vb2_ioctl_create_bufs(struct file *file, void *priv,
p->index = vdev->queue->num_buffers;
fill_buf_caps(vdev->queue, &p->capabilities);
+ validate_memory_flags(vdev->queue, p->memory, &p->flags);
/*
* If count == 0, then just check if memory and type are valid.
* Any -EBUSY result from vb2_verify_memory_type can be mapped to 0.
@@ -126,6 +126,9 @@ struct v4l2_format32 {
* @memory: buffer memory type
* @format: frame format, for which buffers are requested
* @capabilities: capabilities of this buffer type.
+ * @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: future extensions
*/
struct v4l2_create_buffers32 {
@@ -134,7 +137,8 @@ struct v4l2_create_buffers32 {
__u32 memory; /* enum v4l2_memory */
struct v4l2_format32 format;
__u32 capabilities;
- __u32 reserved[7];
+ __u32 flags;
+ __u32 reserved[6];
};
static int get_v4l2_format32(struct v4l2_format *p64,
@@ -182,6 +186,8 @@ static int get_v4l2_create32(struct v4l2_create_buffers *p64,
if (copy_from_user(p64, p32,
offsetof(struct v4l2_create_buffers32, format)))
return -EFAULT;
+ if (copy_from_user(&p64->flags, &p32->flags, sizeof(p32->flags)))
+ return -EFAULT;
return get_v4l2_format32(&p64->format, &p32->format);
}
@@ -227,6 +233,7 @@ static int put_v4l2_create32(struct v4l2_create_buffers *p64,
if (copy_to_user(p32, p64,
offsetof(struct v4l2_create_buffers32, format)) ||
put_user(p64->capabilities, &p32->capabilities) ||
+ put_user(p64->flags, &p32->flags) ||
copy_to_user(p32->reserved, p64->reserved, sizeof(p64->reserved)))
return -EFAULT;
return put_v4l2_format32(&p64->format, &p32->format);
@@ -2003,9 +2003,6 @@ static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
if (ret)
return ret;
-
- CLEAR_AFTER_FIELD(p, capabilities);
-
return ops->vidioc_reqbufs(file, fh, p);
}
@@ -2045,7 +2042,7 @@ static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
if (ret)
return ret;
- CLEAR_AFTER_FIELD(create, capabilities);
+ CLEAR_AFTER_FIELD(create, flags);
v4l_sanitize_format(&create->format);
@@ -953,7 +953,8 @@ struct v4l2_requestbuffers {
__u32 type; /* enum v4l2_buf_type */
__u32 memory; /* enum v4l2_memory */
__u32 capabilities;
- __u32 reserved[1];
+ __u8 flags;
+ __u8 reserved[3];
};
#define V4L2_MEMORY_FLAG_NON_COHERENT (1 << 0)
@@ -2494,6 +2495,9 @@ struct v4l2_dbg_chip_info {
* @memory: enum v4l2_memory; buffer memory type
* @format: frame format, for which buffers are requested
* @capabilities: capabilities of this buffer type.
+ * @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: future extensions
*/
struct v4l2_create_buffers {
@@ -2502,7 +2506,8 @@ struct v4l2_create_buffers {
__u32 memory;
struct v4l2_format format;
__u32 capabilities;
- __u32 reserved[7];
+ __u32 flags;
+ __u32 reserved[6];
};
/*