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 u64 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