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51fd371b RC |
1 | /* |
2 | * Copyright (C) 2014 Red Hat | |
3 | * Author: Rob Clark <robdclark@gmail.com> | |
4 | * | |
5 | * Permission is hereby granted, free of charge, to any person obtaining a | |
6 | * copy of this software and associated documentation files (the "Software"), | |
7 | * to deal in the Software without restriction, including without limitation | |
8 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
9 | * and/or sell copies of the Software, and to permit persons to whom the | |
10 | * Software is furnished to do so, subject to the following conditions: | |
11 | * | |
12 | * The above copyright notice and this permission notice shall be included in | |
13 | * all copies or substantial portions of the Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
18 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
19 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
20 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
21 | * OTHER DEALINGS IN THE SOFTWARE. | |
22 | */ | |
23 | ||
24 | #ifndef DRM_MODESET_LOCK_H_ | |
25 | #define DRM_MODESET_LOCK_H_ | |
26 | ||
27 | #include <linux/ww_mutex.h> | |
28 | ||
29 | struct drm_modeset_lock; | |
30 | ||
31 | /** | |
f3a80881 | 32 | * struct drm_modeset_acquire_ctx - locking context (see ww_acquire_ctx) |
51fd371b RC |
33 | * @ww_ctx: base acquire ctx |
34 | * @contended: used internally for -EDEADLK handling | |
35 | * @locked: list of held locks | |
b7a1aafd | 36 | * @trylock_only: trylock mode used in atomic contexts/panic notifiers |
51fd371b RC |
37 | * |
38 | * Each thread competing for a set of locks must use one acquire | |
39 | * ctx. And if any lock fxn returns -EDEADLK, it must backoff and | |
40 | * retry. | |
41 | */ | |
42 | struct drm_modeset_acquire_ctx { | |
43 | ||
44 | struct ww_acquire_ctx ww_ctx; | |
45 | ||
fe8660ac | 46 | /* |
51fd371b RC |
47 | * Contended lock: if a lock is contended you should only call |
48 | * drm_modeset_backoff() which drops locks and slow-locks the | |
49 | * contended lock. | |
50 | */ | |
51 | struct drm_modeset_lock *contended; | |
52 | ||
fe8660ac | 53 | /* |
51fd371b RC |
54 | * list of held locks (drm_modeset_lock) |
55 | */ | |
56 | struct list_head locked; | |
cb597bb3 | 57 | |
fe8660ac | 58 | /* |
cb597bb3 DV |
59 | * Trylock mode, use only for panic handlers! |
60 | */ | |
61 | bool trylock_only; | |
51fd371b RC |
62 | }; |
63 | ||
64 | /** | |
f3a80881 | 65 | * struct drm_modeset_lock - used for locking modeset resources. |
51fd371b | 66 | * @mutex: resource locking |
d574528a | 67 | * @head: used to hold it's place on &drm_atomi_state.locked list when |
51fd371b RC |
68 | * part of an atomic update |
69 | * | |
70 | * Used for locking CRTCs and other modeset resources. | |
71 | */ | |
72 | struct drm_modeset_lock { | |
fe8660ac | 73 | /* |
51fd371b RC |
74 | * modeset lock |
75 | */ | |
76 | struct ww_mutex mutex; | |
77 | ||
fe8660ac | 78 | /* |
51fd371b RC |
79 | * Resources that are locked as part of an atomic update are added |
80 | * to a list (so we know what to unlock at the end). | |
81 | */ | |
82 | struct list_head head; | |
83 | }; | |
84 | ||
51fd371b RC |
85 | void drm_modeset_acquire_init(struct drm_modeset_acquire_ctx *ctx, |
86 | uint32_t flags); | |
87 | void drm_modeset_acquire_fini(struct drm_modeset_acquire_ctx *ctx); | |
88 | void drm_modeset_drop_locks(struct drm_modeset_acquire_ctx *ctx); | |
89 | void drm_modeset_backoff(struct drm_modeset_acquire_ctx *ctx); | |
90 | int drm_modeset_backoff_interruptible(struct drm_modeset_acquire_ctx *ctx); | |
91 | ||
35cf0350 | 92 | void drm_modeset_lock_init(struct drm_modeset_lock *lock); |
51fd371b RC |
93 | |
94 | /** | |
95 | * drm_modeset_lock_fini - cleanup lock | |
96 | * @lock: lock to cleanup | |
97 | */ | |
98 | static inline void drm_modeset_lock_fini(struct drm_modeset_lock *lock) | |
99 | { | |
100 | WARN_ON(!list_empty(&lock->head)); | |
101 | } | |
102 | ||
103 | /** | |
104 | * drm_modeset_is_locked - equivalent to mutex_is_locked() | |
105 | * @lock: lock to check | |
106 | */ | |
107 | static inline bool drm_modeset_is_locked(struct drm_modeset_lock *lock) | |
108 | { | |
109 | return ww_mutex_is_locked(&lock->mutex); | |
110 | } | |
111 | ||
112 | int drm_modeset_lock(struct drm_modeset_lock *lock, | |
113 | struct drm_modeset_acquire_ctx *ctx); | |
114 | int drm_modeset_lock_interruptible(struct drm_modeset_lock *lock, | |
115 | struct drm_modeset_acquire_ctx *ctx); | |
116 | void drm_modeset_unlock(struct drm_modeset_lock *lock); | |
117 | ||
118 | struct drm_device; | |
d059f652 | 119 | struct drm_crtc; |
4d02e2de | 120 | struct drm_plane; |
a6a8bb84 DV |
121 | |
122 | void drm_modeset_lock_all(struct drm_device *dev); | |
123 | void drm_modeset_unlock_all(struct drm_device *dev); | |
124 | void drm_warn_on_modeset_not_all_locked(struct drm_device *dev); | |
125 | ||
06eaae46 TR |
126 | int drm_modeset_lock_all_ctx(struct drm_device *dev, |
127 | struct drm_modeset_acquire_ctx *ctx); | |
51fd371b RC |
128 | |
129 | #endif /* DRM_MODESET_LOCK_H_ */ |