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
45u64 i915_prandom_u64_state(struct rnd_state *rnd);
46
47static 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
52unsigned int *i915_random_order(unsigned int count,
53				struct rnd_state *state);
54void i915_random_reorder(unsigned int *order,
55			 unsigned int count,
56			 struct rnd_state *state);
57
58void i915_prandom_shuffle(void *arr, size_t elsz, size_t count,
59			  struct rnd_state *state);
60
61u64 igt_random_offset(struct rnd_state *state,
62		      u64 start, u64 end,
63		      u64 len, u64 align);
64
65#endif /* !__I915_SELFTESTS_RANDOM_H__ */
66