1 /*
2 * Copyright 2014 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 */
22
23 #include <linux/types.h>
24 #include "kfd_priv.h"
25
26 static unsigned int pasid_bits = 16;
27 static const struct kfd2kgd_calls *kfd2kgd;
28
kfd_set_pasid_limit(unsigned int new_limit)29 bool kfd_set_pasid_limit(unsigned int new_limit)
30 {
31 if (new_limit < 2)
32 return false;
33
34 if (new_limit < (1U << pasid_bits)) {
35 if (kfd2kgd)
36 /* We've already allocated user PASIDs, too late to
37 * change the limit
38 */
39 return false;
40
41 while (new_limit < (1U << pasid_bits))
42 pasid_bits--;
43 }
44
45 return true;
46 }
47
kfd_get_pasid_limit(void)48 unsigned int kfd_get_pasid_limit(void)
49 {
50 return 1U << pasid_bits;
51 }
52
kfd_pasid_alloc(void)53 unsigned int kfd_pasid_alloc(void)
54 {
55 int r;
56
57 /* Find the first best KFD device for calling KGD */
58 if (!kfd2kgd) {
59 struct kfd_dev *dev = NULL;
60 unsigned int i = 0;
61
62 while ((kfd_topology_enum_kfd_devices(i, &dev)) == 0) {
63 if (dev && dev->kfd2kgd) {
64 kfd2kgd = dev->kfd2kgd;
65 break;
66 }
67 i++;
68 }
69
70 if (!kfd2kgd)
71 return false;
72 }
73
74 r = kfd2kgd->alloc_pasid(pasid_bits);
75
76 return r > 0 ? r : 0;
77 }
78
kfd_pasid_free(unsigned int pasid)79 void kfd_pasid_free(unsigned int pasid)
80 {
81 if (kfd2kgd)
82 kfd2kgd->free_pasid(pasid);
83 }
84
