2 * Copyright 2014 Advanced Micro Devices, Inc.
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5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
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8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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23 #include <linux/types.h>
26 static unsigned int pasid_bits = 16;
27 static const struct kfd2kgd_calls *kfd2kgd;
29 bool kfd_set_pasid_limit(unsigned int new_limit)
34 if (new_limit < (1U << pasid_bits)) {
36 /* We've already allocated user PASIDs, too late to
41 while (new_limit < (1U << pasid_bits))
48 unsigned int kfd_get_pasid_limit(void)
50 return 1U << pasid_bits;
53 unsigned int kfd_pasid_alloc(void)
57 /* Find the first best KFD device for calling KGD */
59 struct kfd_dev *dev = NULL;
62 while ((kfd_topology_enum_kfd_devices(i, &dev)) == 0) {
63 if (dev && dev->kfd2kgd) {
64 kfd2kgd = dev->kfd2kgd;
74 r = kfd2kgd->alloc_pasid(pasid_bits);
79 void kfd_pasid_free(unsigned int pasid)
82 kfd2kgd->free_pasid(pasid);