| 1 | /* |
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| 2 | * Copyright © 2016 Intel Corporation |
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| 3 | * |
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| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 5 | * copy of this software and associated documentation files (the "Software"), |
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| 6 | * to deal in the Software without restriction, including without limitation |
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| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 9 | * Software is furnished to do so, subject to the following conditions: |
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| 10 | * |
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| 11 | * The above copyright notice and this permission notice (including the next |
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| 12 | * paragraph) shall be included in all copies or substantial portions of the |
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| 13 | * Software. |
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| 14 | * |
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| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
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| 21 | * IN THE SOFTWARE. |
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| 22 | * |
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| 23 | */ |
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| 24 | |
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| 25 | #ifndef __I915_SELFTESTS_RANDOM_H__ |
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| 26 | #define __I915_SELFTESTS_RANDOM_H__ |
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| 27 | |
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| 28 | #include <linux/math64.h> |
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| 29 | #include <linux/prandom.h> |
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| 30 | |
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| 31 | #include "../i915_selftest.h" |
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| 32 | |
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| 33 | #define I915_RND_STATE_INITIALIZER(x) ({ \ |
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| 34 | struct rnd_state state__; \ |
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| 35 | prandom_seed_state(&state__, (x)); \ |
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| 36 | state__; \ |
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| 37 | }) |
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| 38 | |
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| 39 | #define I915_RND_STATE(name__) \ |
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| 40 | struct rnd_state name__ = I915_RND_STATE_INITIALIZER(i915_selftest.random_seed) |
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| 41 | |
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| 42 | #define I915_RND_SUBSTATE(name__, parent__) \ |
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| 43 | struct rnd_state name__ = I915_RND_STATE_INITIALIZER(prandom_u32_state(&(parent__))) |
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| 44 | |
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| 45 | u64 i915_prandom_u64_state(struct rnd_state *rnd); |
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| 46 | |
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| 47 | static inline u32 i915_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state) |
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| 48 | { |
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| 49 | return upper_32_bits(mul_u32_u32(prandom_u32_state(state), ep_ro)); |
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| 50 | } |
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| 51 | |
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| 52 | unsigned int *i915_random_order(unsigned int count, |
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| 53 | struct rnd_state *state); |
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| 54 | void i915_random_reorder(unsigned int *order, |
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| 55 | unsigned int count, |
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| 56 | struct rnd_state *state); |
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| 57 | |
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| 58 | void i915_prandom_shuffle(void *arr, size_t elsz, size_t count, |
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| 59 | struct rnd_state *state); |
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| 60 | |
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| 61 | u64 igt_random_offset(struct rnd_state *state, |
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| 62 | u64 start, u64 end, |
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| 63 | u64 len, u64 align); |
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| 64 | |
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| 65 | #endif /* !__I915_SELFTESTS_RANDOM_H__ */ |
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| 66 | |
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