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