drivers/gpu/drm/lib/drm_random.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __DRM_RANDOM_H__
   3 #define __DRM_RANDOM_H__
   4
   5 /* This is a temporary home for a couple of utility functions that should
   6  * be transposed to lib/ at the earliest convenience.
   7  */
   8
   9 #include <linux/random.h>
  10
  11 #define DRM_RND_STATE_INITIALIZER(seed__) ({                            \
  12         struct rnd_state state__;                                       \
  13         prandom_seed_state(&state__, (seed__));                         \
  14         state__;                                                        \
  15 })
  16
  17 #define DRM_RND_STATE(name__, seed__) \
  18         struct rnd_state name__ = DRM_RND_STATE_INITIALIZER(seed__)
  19
  20 unsigned int *drm_random_order(unsigned int count,
  21                                struct rnd_state *state);
  22 void drm_random_reorder(unsigned int *order,
  23                         unsigned int count,
  24                         struct rnd_state *state);
  25 u32 drm_prandom_u32_max_state(u32 ep_ro,
  26                               struct rnd_state *state);
  27
  28 #endif /* !__DRM_RANDOM_H__ */