/*
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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/types.h>
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#include "kfd_priv.h"
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static unsigned int pasid_bits = 16;
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static const struct kfd2kgd_calls *kfd2kgd;
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bool kfd_set_pasid_limit(unsigned int new_limit)
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{
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if (new_limit < 2)
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return false;
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if (new_limit < (1U << pasid_bits)) {
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if (kfd2kgd)
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/* We've already allocated user PASIDs, too late to
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* change the limit
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*/
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return false;
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while (new_limit < (1U << pasid_bits))
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pasid_bits--;
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}
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return true;
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}
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unsigned int kfd_get_pasid_limit(void)
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{
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return 1U << pasid_bits;
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}
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unsigned int kfd_pasid_alloc(void)
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{
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int r;
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/* Find the first best KFD device for calling KGD */
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if (!kfd2kgd) {
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struct kfd_dev *dev = NULL;
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unsigned int i = 0;
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while ((kfd_topology_enum_kfd_devices(i, &dev)) == 0) {
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if (dev && dev->kfd2kgd) {
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kfd2kgd = dev->kfd2kgd;
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break;
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}
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i++;
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}
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if (!kfd2kgd)
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return false;
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}
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r = kfd2kgd->alloc_pasid(pasid_bits);
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return r > 0 ? r : 0;
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}
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void kfd_pasid_free(unsigned int pasid)
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{
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if (kfd2kgd)
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kfd2kgd->free_pasid(pasid);
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}
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