include/uapi/linux/uio.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3  *      Berkeley style UIO structures   -       Alan Cox 1994.
   4  *
   5  *              This program is free software; you can redistribute it and/or
   6  *              modify it under the terms of the GNU General Public License
   7  *              as published by the Free Software Foundation; either version
   8  *              2 of the License, or (at your option) any later version.
   9  */
  10 #ifndef _UAPI__LINUX_UIO_H
  11 #define _UAPI__LINUX_UIO_H
  12
  13 #include <linux/compiler.h>
  14 #include <linux/types.h>
  15
  16
  17 struct iovec
  18 {
  19         void __user *iov_base;  /* BSD uses caddr_t (1003.1g requires void *) */
  20         __kernel_size_t iov_len; /* Must be size_t (1003.1g) */
  21 };
  22
  23 struct dmabuf_cmsg {
  24         __u64 frag_offset;      /* offset into the dmabuf where the frag starts.
  25                                  */
  26         __u32 frag_size;        /* size of the frag. */
  27         __u32 frag_token;       /* token representing this frag for
  28                                  * DEVMEM_DONTNEED.
  29                                  */
  30         __u32  dmabuf_id;       /* dmabuf id this frag belongs to. */
  31         __u32 flags;            /* Currently unused. Reserved for future
  32                                  * uses.
  33                                  */
  34 };
  35
  36 struct dmabuf_token {
  37         __u32 token_start;
  38         __u32 token_count;
  39 };
  40
  41 /*
  42  *      UIO_MAXIOV shall be at least 16 1003.1g (5.4.1.1)
  43  */
  44
  45 #define UIO_FASTIOV     8
  46 #define UIO_MAXIOV      1024
  47
  48
  49 #endif /* _UAPI__LINUX_UIO_H */