drivers/gpu/drm/i915/selftests/i915_random.h

   1 /*
   2  * Copyright © 2016 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #ifndef __I915_SELFTESTS_RANDOM_H__
  26 #define __I915_SELFTESTS_RANDOM_H__
  27
  28 #include <linux/random.h>
  29
  30 #include "../i915_selftest.h"
  31
  32 #define I915_RND_STATE_INITIALIZER(x) ({                                \
  33         struct rnd_state state__;                                       \
  34         prandom_seed_state(&state__, (x));                              \
  35         state__;                                                        \
  36 })
  37
  38 #define I915_RND_STATE(name__) \
  39         struct rnd_state name__ = I915_RND_STATE_INITIALIZER(i915_selftest.random_seed)
  40
  41 #define I915_RND_SUBSTATE(name__, parent__) \
  42         struct rnd_state name__ = I915_RND_STATE_INITIALIZER(prandom_u32_state(&(parent__)))
  43
  44 u64 i915_prandom_u64_state(struct rnd_state *rnd);
  45
  46 static inline u32 i915_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
  47 {
  48         return upper_32_bits(mul_u32_u32(prandom_u32_state(state), ep_ro));
  49 }
  50
  51 unsigned int *i915_random_order(unsigned int count,
  52                                 struct rnd_state *state);
  53 void i915_random_reorder(unsigned int *order,
  54                          unsigned int count,
  55                          struct rnd_state *state);
  56
  57 #endif /* !__I915_SELFTESTS_RANDOM_H__ */