Commit | Line | Data |
---|---|---|
19f6d2a6 OG |
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/slab.h> | |
24 | #include <linux/types.h> | |
25 | #include "kfd_priv.h" | |
26 | ||
27 | static unsigned long *pasid_bitmap; | |
28 | static unsigned int pasid_limit; | |
29 | static DEFINE_MUTEX(pasid_mutex); | |
30 | ||
31 | int kfd_pasid_init(void) | |
32 | { | |
b8cbab04 | 33 | pasid_limit = KFD_MAX_NUM_OF_PROCESSES; |
19f6d2a6 | 34 | |
68d0cb49 | 35 | pasid_bitmap = kcalloc(BITS_TO_LONGS(pasid_limit), sizeof(long), GFP_KERNEL); |
19f6d2a6 OG |
36 | if (!pasid_bitmap) |
37 | return -ENOMEM; | |
38 | ||
39 | set_bit(0, pasid_bitmap); /* PASID 0 is reserved. */ | |
40 | ||
41 | return 0; | |
42 | } | |
43 | ||
44 | void kfd_pasid_exit(void) | |
45 | { | |
46 | kfree(pasid_bitmap); | |
47 | } | |
48 | ||
49 | bool kfd_set_pasid_limit(unsigned int new_limit) | |
50 | { | |
51 | if (new_limit < pasid_limit) { | |
52 | bool ok; | |
53 | ||
54 | mutex_lock(&pasid_mutex); | |
55 | ||
56 | /* ensure that no pasids >= new_limit are in-use */ | |
57 | ok = (find_next_bit(pasid_bitmap, pasid_limit, new_limit) == | |
58 | pasid_limit); | |
59 | if (ok) | |
60 | pasid_limit = new_limit; | |
61 | ||
62 | mutex_unlock(&pasid_mutex); | |
63 | ||
64 | return ok; | |
65 | } | |
66 | ||
67 | return true; | |
68 | } | |
69 | ||
70 | inline unsigned int kfd_get_pasid_limit(void) | |
71 | { | |
72 | return pasid_limit; | |
73 | } | |
74 | ||
75 | unsigned int kfd_pasid_alloc(void) | |
76 | { | |
77 | unsigned int found; | |
78 | ||
79 | mutex_lock(&pasid_mutex); | |
80 | ||
81 | found = find_first_zero_bit(pasid_bitmap, pasid_limit); | |
82 | if (found == pasid_limit) | |
83 | found = 0; | |
84 | else | |
85 | set_bit(found, pasid_bitmap); | |
86 | ||
87 | mutex_unlock(&pasid_mutex); | |
88 | ||
89 | return found; | |
90 | } | |
91 | ||
92 | void kfd_pasid_free(unsigned int pasid) | |
93 | { | |
94 | BUG_ON(pasid == 0 || pasid >= pasid_limit); | |
95 | clear_bit(pasid, pasid_bitmap); | |
96 | } |