projects / deliverable / linux.git / blame
| 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 | } |