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/math64.h>
29 #include <linux/random.h>
30
31 #include "../i915_selftest.h"
32
33 #define I915_RND_STATE_INITIALIZER(x) ({ \
34 struct rnd_state state__; \
35 prandom_seed_state(&state__, (x)); \
36 state__; \
37 })
38
39 #define I915_RND_STATE(name__) \
40 struct rnd_state name__ = I915_RND_STATE_INITIALIZER(i915_selftest.random_seed)
41
42 #define I915_RND_SUBSTATE(name__, parent__) \
43 struct rnd_state name__ = I915_RND_STATE_INITIALIZER(prandom_u32_state(&(parent__)))
44
45 u64 i915_prandom_u64_state(struct rnd_state *rnd);
46
47 static inline u32 i915_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
48 {
49 return upper_32_bits(mul_u32_u32(prandom_u32_state(state), ep_ro));
50 }
51
52 unsigned int *i915_random_order(unsigned int count,
53 struct rnd_state *state);
54 void i915_random_reorder(unsigned int *order,
55 unsigned int count,
56 struct rnd_state *state);
57
58 void i915_prandom_shuffle(void *arr, size_t elsz, size_t count,
59 struct rnd_state *state);
60
61 #endif /* !__I915_SELFTESTS_RANDOM_H__ */