On 9/11/18 6:42 AM, Gerd Hoffmann wrote:
Signed-off-by: Gerd Hoffmann kraxel@redhat.com
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.