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7ce5b6850b
As realised by commit 9e3d6223d2 ("math64, timers: Fix 32bit
mul_u64_u32_shr() and friends"), GCC does not always generate ideal code
for performing a 32b x 32b multiply returning a 64b result (i.e. where
we idiomatically use u64 result = (u64)x * (u32)x).
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20170913105154.2910-2-chris@chris-wilson.co.uk
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
/*
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* Copyright © 2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#ifndef __I915_SELFTESTS_RANDOM_H__
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#define __I915_SELFTESTS_RANDOM_H__
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#include <linux/random.h>
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#include "../i915_selftest.h"
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#define I915_RND_STATE_INITIALIZER(x) ({ \
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struct rnd_state state__; \
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prandom_seed_state(&state__, (x)); \
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state__; \
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})
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#define I915_RND_STATE(name__) \
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struct rnd_state name__ = I915_RND_STATE_INITIALIZER(i915_selftest.random_seed)
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#define I915_RND_SUBSTATE(name__, parent__) \
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struct rnd_state name__ = I915_RND_STATE_INITIALIZER(prandom_u32_state(&(parent__)))
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u64 i915_prandom_u64_state(struct rnd_state *rnd);
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static inline u32 i915_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
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{
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return upper_32_bits(mul_u32_u32(prandom_u32_state(state), ep_ro));
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}
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unsigned int *i915_random_order(unsigned int count,
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struct rnd_state *state);
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void i915_random_reorder(unsigned int *order,
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unsigned int count,
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struct rnd_state *state);
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#endif /* !__I915_SELFTESTS_RANDOM_H__ */
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