forked from Minki/linux
aeda036c37
All the bit operations (such as find_first_zero_bit()) read sizeof(long) bytes at a time. If we allocated less than sizeof(long) bytes for the bitmask we would be accessing invalid memory when working with the bitmask. Change the allocator to allocate sizeof(long) multiples for the bitmask. Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/*
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* Copyright 2014 Advanced Micro Devices, Inc.
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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 shall be included in
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* all copies or substantial portions of the 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/slab.h>
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#include <linux/types.h>
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#include "kfd_priv.h"
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static unsigned long *pasid_bitmap;
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static unsigned int pasid_limit;
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static DEFINE_MUTEX(pasid_mutex);
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int kfd_pasid_init(void)
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{
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pasid_limit = max_num_of_processes;
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pasid_bitmap = kzalloc(BITS_TO_LONGS(pasid_limit), GFP_KERNEL);
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if (!pasid_bitmap)
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return -ENOMEM;
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set_bit(0, pasid_bitmap); /* PASID 0 is reserved. */
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return 0;
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}
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void kfd_pasid_exit(void)
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{
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kfree(pasid_bitmap);
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}
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bool kfd_set_pasid_limit(unsigned int new_limit)
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{
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if (new_limit < pasid_limit) {
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bool ok;
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mutex_lock(&pasid_mutex);
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/* ensure that no pasids >= new_limit are in-use */
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ok = (find_next_bit(pasid_bitmap, pasid_limit, new_limit) ==
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pasid_limit);
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if (ok)
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pasid_limit = new_limit;
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mutex_unlock(&pasid_mutex);
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return ok;
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}
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return true;
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}
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inline unsigned int kfd_get_pasid_limit(void)
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{
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return pasid_limit;
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}
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unsigned int kfd_pasid_alloc(void)
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{
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unsigned int found;
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mutex_lock(&pasid_mutex);
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found = find_first_zero_bit(pasid_bitmap, pasid_limit);
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if (found == pasid_limit)
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found = 0;
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else
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set_bit(found, pasid_bitmap);
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mutex_unlock(&pasid_mutex);
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return found;
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}
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void kfd_pasid_free(unsigned int pasid)
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{
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BUG_ON(pasid == 0 || pasid >= pasid_limit);
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clear_bit(pasid, pasid_bitmap);
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}
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