68d0cb49f8
Commit "amdkfd: use sizeof(long) granularity for the pasid bitmask" calculated the number of longs it will need, but ended up allocating that number of bytes rather than longs. Fix that silly error and allocate the amount of data really required. 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 = kcalloc(BITS_TO_LONGS(pasid_limit), sizeof(long), 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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