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9861b66828
In the selftests, we don't want to force an oom and would rather ENOMEM be reported. In this case, we would rather the allocation for the random array to fail. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171223110407.21402-2-chris@chris-wilson.co.uk
70 lines
2 KiB
C
70 lines
2 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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#include <linux/bitops.h>
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#include <linux/kernel.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include "i915_random.h"
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u64 i915_prandom_u64_state(struct rnd_state *rnd)
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{
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u64 x;
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x = prandom_u32_state(rnd);
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x <<= 32;
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x |= prandom_u32_state(rnd);
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return x;
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}
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void i915_random_reorder(unsigned int *order, unsigned int count,
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struct rnd_state *state)
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{
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unsigned int i, j;
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for (i = 0; i < count; i++) {
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BUILD_BUG_ON(sizeof(unsigned int) > sizeof(u32));
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j = i915_prandom_u32_max_state(count, state);
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swap(order[i], order[j]);
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}
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}
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unsigned int *i915_random_order(unsigned int count, struct rnd_state *state)
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{
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unsigned int *order, i;
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order = kmalloc_array(count, sizeof(*order),
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GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
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if (!order)
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return order;
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for (i = 0; i < count; i++)
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order[i] = i;
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i915_random_reorder(order, count, state);
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return order;
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}
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