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1 | /* |
1 | /* |
2 | * Header file for reservations for dma-buf and ttm |
2 | * Header file for reservations for dma-buf and ttm |
3 | * |
3 | * |
4 | * Copyright(C) 2011 Linaro Limited. All rights reserved. |
4 | * Copyright(C) 2011 Linaro Limited. All rights reserved. |
5 | * Copyright (C) 2012-2013 Canonical Ltd |
5 | * Copyright (C) 2012-2013 Canonical Ltd |
6 | * Copyright (C) 2012 Texas Instruments |
6 | * Copyright (C) 2012 Texas Instruments |
7 | * |
7 | * |
8 | * Authors: |
8 | * Authors: |
9 | * Rob Clark |
9 | * Rob Clark |
10 | * Maarten Lankhorst |
10 | * Maarten Lankhorst |
11 | * Thomas Hellstrom |
11 | * Thomas Hellstrom |
12 | * |
12 | * |
13 | * Based on bo.c which bears the following copyright notice, |
13 | * Based on bo.c which bears the following copyright notice, |
14 | * but is dual licensed: |
14 | * but is dual licensed: |
15 | * |
15 | * |
16 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA |
16 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA |
17 | * All Rights Reserved. |
17 | * All Rights Reserved. |
18 | * |
18 | * |
19 | * Permission is hereby granted, free of charge, to any person obtaining a |
19 | * Permission is hereby granted, free of charge, to any person obtaining a |
20 | * copy of this software and associated documentation files (the |
20 | * copy of this software and associated documentation files (the |
21 | * "Software"), to deal in the Software without restriction, including |
21 | * "Software"), to deal in the Software without restriction, including |
22 | * without limitation the rights to use, copy, modify, merge, publish, |
22 | * without limitation the rights to use, copy, modify, merge, publish, |
23 | * distribute, sub license, and/or sell copies of the Software, and to |
23 | * distribute, sub license, and/or sell copies of the Software, and to |
24 | * permit persons to whom the Software is furnished to do so, subject to |
24 | * permit persons to whom the Software is furnished to do so, subject to |
25 | * the following conditions: |
25 | * the following conditions: |
26 | * |
26 | * |
27 | * The above copyright notice and this permission notice (including the |
27 | * The above copyright notice and this permission notice (including the |
28 | * next paragraph) shall be included in all copies or substantial portions |
28 | * next paragraph) shall be included in all copies or substantial portions |
29 | * of the Software. |
29 | * of the Software. |
30 | * |
30 | * |
31 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
31 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
32 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
32 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
33 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
33 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
34 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
34 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
35 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
35 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
36 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
36 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
37 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
37 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
38 | */ |
38 | */ |
39 | #ifndef _LINUX_RESERVATION_H |
39 | #ifndef _LINUX_RESERVATION_H |
40 | #define _LINUX_RESERVATION_H |
40 | #define _LINUX_RESERVATION_H |
41 | 41 | ||
42 | #include |
42 | #include |
- | 43 | #include |
|
- | 44 | #include |
|
- | 45 | #include |
|
- | 46 | #include |
|
43 | 47 | ||
- | 48 | extern struct ww_class reservation_ww_class; |
|
- | 49 | extern struct lock_class_key reservation_seqcount_class; |
|
- | 50 | extern const char reservation_seqcount_string[]; |
|
- | 51 | ||
- | 52 | struct reservation_object_list { |
|
- | 53 | struct rcu_head rcu; |
|
- | 54 | u32 shared_count, shared_max; |
|
- | 55 | struct fence __rcu *shared[]; |
|
44 | extern struct ww_class reservation_ww_class; |
56 | }; |
45 | 57 | ||
46 | struct reservation_object { |
58 | struct reservation_object { |
47 | struct ww_mutex lock; |
59 | struct ww_mutex lock; |
- | 60 | seqcount_t seq; |
|
- | 61 | ||
- | 62 | struct fence __rcu *fence_excl; |
|
- | 63 | struct reservation_object_list __rcu *fence; |
|
- | 64 | struct reservation_object_list *staged; |
|
48 | }; |
65 | }; |
- | 66 | ||
- | 67 | #define reservation_object_held(obj) lockdep_is_held(&(obj)->lock.base) |
|
- | 68 | #define reservation_object_assert_held(obj) \ |
|
- | 69 | lockdep_assert_held(&(obj)->lock.base) |
|
49 | 70 | ||
50 | static inline void |
71 | static inline void |
51 | reservation_object_init(struct reservation_object *obj) |
72 | reservation_object_init(struct reservation_object *obj) |
52 | { |
73 | { |
53 | ww_mutex_init(&obj->lock, &reservation_ww_class); |
74 | ww_mutex_init(&obj->lock, &reservation_ww_class); |
- | 75 | ||
- | 76 | __seqcount_init(&obj->seq, reservation_seqcount_string, &reservation_seqcount_class); |
|
- | 77 | RCU_INIT_POINTER(obj->fence, NULL); |
|
- | 78 | RCU_INIT_POINTER(obj->fence_excl, NULL); |
|
- | 79 | obj->staged = NULL; |
|
54 | } |
80 | } |
55 | 81 | ||
56 | static inline void |
82 | static inline void |
57 | reservation_object_fini(struct reservation_object *obj) |
83 | reservation_object_fini(struct reservation_object *obj) |
58 | { |
84 | { |
- | 85 | int i; |
|
- | 86 | struct reservation_object_list *fobj; |
|
- | 87 | struct fence *excl; |
|
- | 88 | ||
- | 89 | /* |
|
- | 90 | * This object should be dead and all references must have |
|
- | 91 | * been released to it, so no need to be protected with rcu. |
|
- | 92 | */ |
|
- | 93 | excl = rcu_dereference_protected(obj->fence_excl, 1); |
|
- | 94 | if (excl) |
|
- | 95 | fence_put(excl); |
|
- | 96 | ||
- | 97 | fobj = rcu_dereference_protected(obj->fence, 1); |
|
- | 98 | if (fobj) { |
|
- | 99 | for (i = 0; i < fobj->shared_count; ++i) |
|
- | 100 | fence_put(rcu_dereference_protected(fobj->shared[i], 1)); |
|
- | 101 | ||
- | 102 | kfree(fobj); |
|
- | 103 | } |
|
- | 104 | kfree(obj->staged); |
|
- | 105 | ||
59 | ww_mutex_destroy(&obj->lock); |
106 | ww_mutex_destroy(&obj->lock); |
60 | } |
107 | } |
- | 108 | ||
- | 109 | static inline struct reservation_object_list * |
|
- | 110 | reservation_object_get_list(struct reservation_object *obj) |
|
- | 111 | { |
|
- | 112 | return rcu_dereference_protected(obj->fence, |
|
- | 113 | reservation_object_held(obj)); |
|
- | 114 | } |
|
- | 115 | ||
- | 116 | static inline struct fence * |
|
- | 117 | reservation_object_get_excl(struct reservation_object *obj) |
|
- | 118 | { |
|
- | 119 | return rcu_dereference_protected(obj->fence_excl, |
|
- | 120 | reservation_object_held(obj)); |
|
- | 121 | } |
|
- | 122 | ||
- | 123 | int reservation_object_reserve_shared(struct reservation_object *obj); |
|
- | 124 | void reservation_object_add_shared_fence(struct reservation_object *obj, |
|
- | 125 | struct fence *fence); |
|
- | 126 | ||
- | 127 | void reservation_object_add_excl_fence(struct reservation_object *obj, |
|
- | 128 | struct fence *fence); |
|
- | 129 | ||
- | 130 | int reservation_object_get_fences_rcu(struct reservation_object *obj, |
|
- | 131 | struct fence **pfence_excl, |
|
- | 132 | unsigned *pshared_count, |
|
- | 133 | struct fence ***pshared); |
|
- | 134 | ||
- | 135 | long reservation_object_wait_timeout_rcu(struct reservation_object *obj, |
|
- | 136 | bool wait_all, bool intr, |
|
- | 137 | unsigned long timeout); |
|
- | 138 | ||
- | 139 | bool reservation_object_test_signaled_rcu(struct reservation_object *obj, |
|
- | 140 | bool test_all); |
|
61 | 141 | ||
62 | #endif /* _LINUX_RESERVATION_H */ |
142 | #endif /* _LINUX_RESERVATION_H */> |