drivers/gpu/drm/nouveau/include/nvif/unpack.h

   1 /* SPDX-License-Identifier: MIT */
   2 #ifndef __NVIF_UNPACK_H__
   3 #define __NVIF_UNPACK_H__
   4
   5 #define nvif_unvers(r,d,s,m) ({                                                \
   6         void **_data = (d); __u32 *_size = (s); int _ret = (r);                \
   7         if (_ret == -ENOSYS && *_size == sizeof(m)) {                          \
   8                 *_data = NULL;                                                 \
   9                 *_size = _ret = 0;                                             \
  10         }                                                                      \
  11         _ret;                                                                  \
  12 })
  13
  14 #define nvif_unpack(r,d,s,m,vl,vh,x) ({                                        \
  15         void **_data = (d); __u32 *_size = (s);                                \
  16         int _ret = (r), _vl = (vl), _vh = (vh);                                \
  17         if (_ret == -ENOSYS && *_size >= sizeof(m) &&                          \
  18             (m).version >= _vl && (m).version <= _vh) {                        \
  19                 *_data = (__u8 *)*_data + sizeof(m);                           \
  20                 *_size = *_size - sizeof(m);                                   \
  21                 if (_ret = 0, !(x)) {                                          \
  22                         _ret = *_size ? -E2BIG : 0;                            \
  23                         *_data = NULL;                                         \
  24                         *_size = 0;                                            \
  25                 }                                                              \
  26         }                                                                      \
  27         _ret;                                                                  \
  28 })
  29 #endif