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 void i915_prandom_shuffle(void *arr, size_t elsz, size_t count, 58 struct rnd_state *state); 59 60 u64 igt_random_offset(struct rnd_state *state, 61 u64 start, u64 end, 62 u64 len, u64 align); 63 64 #endif /* !__I915_SELFTESTS_RANDOM_H__ */ 65