1 /* $NetBSD: i915_random.h,v 1.2 2021/12/18 23:45:31 riastradh Exp $ */
2
3 /*
4 * Copyright © 2016 Intel Corporation
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
23 * IN THE SOFTWARE.
24 *
25 */
26
27 #ifndef __I915_SELFTESTS_RANDOM_H__
28 #define __I915_SELFTESTS_RANDOM_H__
29
30 #include <linux/math64.h>
31 #include <linux/random.h>
32
33 #include "../i915_selftest.h"
34
35 #define I915_RND_STATE_INITIALIZER(x) ({ \
36 struct rnd_state state__; \
37 prandom_seed_state(&state__, (x)); \
38 state__; \
39 })
40
41 #define I915_RND_STATE(name__) \
42 struct rnd_state name__ = I915_RND_STATE_INITIALIZER(i915_selftest.random_seed)
43
44 #define I915_RND_SUBSTATE(name__, parent__) \
45 struct rnd_state name__ = I915_RND_STATE_INITIALIZER(prandom_u32_state(&(parent__)))
46
47 u64 i915_prandom_u64_state(struct rnd_state *rnd);
48
i915_prandom_u32_max_state(u32 ep_ro,struct rnd_state * state)49 static inline u32 i915_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
50 {
51 return upper_32_bits(mul_u32_u32(prandom_u32_state(state), ep_ro));
52 }
53
54 unsigned int *i915_random_order(unsigned int count,
55 struct rnd_state *state);
56 void i915_random_reorder(unsigned int *order,
57 unsigned int count,
58 struct rnd_state *state);
59
60 void i915_prandom_shuffle(void *arr, size_t elsz, size_t count,
61 struct rnd_state *state);
62
63 u64 igt_random_offset(struct rnd_state *state,
64 u64 start, u64 end,
65 u64 len, u64 align);
66
67 #endif /* !__I915_SELFTESTS_RANDOM_H__ */
68