On 9/11/18 6:42 AM, Gerd Hoffmann wrote:
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> ---
> include/uapi/linux/udmabuf.h | 50 +++++++++++++++++++++++++++++++++---
> Documentation/driver-api/dma-buf.rst | 8 ++++++
> 2 files changed, 55 insertions(+), 3 deletions(-)
>
> diff --git a/include/uapi/linux/udmabuf.h b/include/uapi/linux/udmabuf.h
> index 46b6532ed8..f30b37cb5c 100644
> --- a/include/uapi/linux/udmabuf.h
> +++ b/include/uapi/linux/udmabuf.h
> @@ -5,8 +5,38 @@
> #include <linux/types.h>
> #include <linux/ioctl.h>
>
> +/**
> + * DOC: udmabuf
> + *
> + * udmabuf is a device driver which allows userspace create dmabufs.
to create
> + * The memory used for these dmabufs must be backed by memfd. The
> + * memfd must have F_SEAL_SHRINK and it must not have F_SEAL_WRITE.
> + *
> + * The driver has two ioctls, one to create a dmabuf from a single
> + * memory block and one to create a dmabuf from a list of memory
> + * blocks.
> + *
> + * UDMABUF_CREATE - _IOW('u', 0x42, udmabuf_create)
> + *
> + * UDMABUF_CREATE_LIST - _IOW('u', 0x43, udmabuf_create_list)
> + */
> +
> +#define UDMABUF_CREATE _IOW('u', 0x42, struct udmabuf_create)
> +#define UDMABUF_CREATE_LIST _IOW('u', 0x43, struct udmabuf_create_list)
> +
> #define UDMABUF_FLAGS_CLOEXEC 0x01
>
> +/**
> + * struct udmabuf_create - create a dmabuf from a single memory block.
> + *
> + * @memfd: The file handle.
> + * @offset: Start of the buffer (from memfd start).
> + * Must be page aligned.
> + * @size: Size of the buffer. Must be rounded to page size.
@flags: ???
> + *
> + * flags:
> + * UDMABUF_FLAGS_CLOEXEC: set CLOEXEC flag for the dmabuf.
> + */
> struct udmabuf_create {
> __u32 memfd;
> __u32 flags;
> @@ -14,6 +44,14 @@ struct udmabuf_create {
> __u64 size;
> };
>
> +/**
> + * struct udmabuf_create_item - one memory block list item.
> + *
> + * @memfd: The file handle.
> + * @offset: Start of the buffer (from memfd start).
> + * Must be page aligned.
> + * @size: Size of the buffer. Must be rounded to page size.
> + */
> struct udmabuf_create_item {
> __u32 memfd;
> __u32 __pad;
> @@ -21,13 +59,19 @@ struct udmabuf_create_item {
> __u64 size;
> };
>
> +/**
> + * struct udmabuf_create_list - create a dmabuf from a memory block list.
> + *
> + * @count: The number of list elements.
> + * @list: The memory block list
> + *
> + * flags:
@flags:
> + * UDMABUF_FLAGS_CLOEXEC: set CLOEXEC flag for the dmabuf.
> + */
> struct udmabuf_create_list {
> __u32 flags;
> __u32 count;
> struct udmabuf_create_item list[];
> };
thanks.
--
~Randy
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