cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

i915_random.h (2340B)

      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__ */