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      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 
     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