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5056 | serge | 1 | /* |
2 | * Copyright (C) 2014 Red Hat |
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3 | * Author: Rob Clark |
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4 | * |
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5 | * Permission is hereby granted, free of charge, to any person obtaining a |
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6 | * copy of this software and associated documentation files (the "Software"), |
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7 | * to deal in the Software without restriction, including without limitation |
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8 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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9 | * and/or sell copies of the Software, and to permit persons to whom the |
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10 | * Software is furnished to do so, subject to the following conditions: |
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11 | * |
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12 | * The above copyright notice and this permission notice shall be included in |
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13 | * all copies or substantial portions of the Software. |
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14 | * |
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15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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18 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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19 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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20 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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21 | * OTHER DEALINGS IN THE SOFTWARE. |
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22 | */ |
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23 | |||
24 | #ifndef DRM_MODESET_LOCK_H_ |
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25 | #define DRM_MODESET_LOCK_H_ |
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26 | |||
27 | #include |
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28 | |||
29 | struct drm_modeset_lock; |
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30 | |||
31 | /** |
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5270 | serge | 32 | * struct drm_modeset_acquire_ctx - locking context (see ww_acquire_ctx) |
5056 | serge | 33 | * @ww_ctx: base acquire ctx |
34 | * @contended: used internally for -EDEADLK handling |
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35 | * @locked: list of held locks |
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5270 | serge | 36 | * @trylock_only: trylock mode used in atomic contexts/panic notifiers |
5056 | serge | 37 | * |
38 | * Each thread competing for a set of locks must use one acquire |
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39 | * ctx. And if any lock fxn returns -EDEADLK, it must backoff and |
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40 | * retry. |
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41 | */ |
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42 | struct drm_modeset_acquire_ctx { |
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43 | |||
44 | struct ww_acquire_ctx ww_ctx; |
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45 | |||
6082 | serge | 46 | /* |
5056 | serge | 47 | * Contended lock: if a lock is contended you should only call |
48 | * drm_modeset_backoff() which drops locks and slow-locks the |
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49 | * contended lock. |
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50 | */ |
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51 | struct drm_modeset_lock *contended; |
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52 | |||
6082 | serge | 53 | /* |
5056 | serge | 54 | * list of held locks (drm_modeset_lock) |
55 | */ |
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56 | struct list_head locked; |
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5270 | serge | 57 | |
6082 | serge | 58 | /* |
5270 | serge | 59 | * Trylock mode, use only for panic handlers! |
60 | */ |
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61 | bool trylock_only; |
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5056 | serge | 62 | }; |
63 | |||
64 | /** |
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5270 | serge | 65 | * struct drm_modeset_lock - used for locking modeset resources. |
5056 | serge | 66 | * @mutex: resource locking |
67 | * @head: used to hold it's place on state->locked list when |
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68 | * part of an atomic update |
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69 | * |
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70 | * Used for locking CRTCs and other modeset resources. |
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71 | */ |
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72 | struct drm_modeset_lock { |
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6082 | serge | 73 | /* |
5056 | serge | 74 | * modeset lock |
75 | */ |
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76 | struct ww_mutex mutex; |
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77 | |||
6082 | serge | 78 | /* |
5056 | serge | 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). |
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81 | */ |
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82 | struct list_head head; |
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83 | }; |
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84 | |||
85 | extern struct ww_class crtc_ww_class; |
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86 | |||
87 | void drm_modeset_acquire_init(struct drm_modeset_acquire_ctx *ctx, |
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88 | uint32_t flags); |
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89 | void drm_modeset_acquire_fini(struct drm_modeset_acquire_ctx *ctx); |
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90 | void drm_modeset_drop_locks(struct drm_modeset_acquire_ctx *ctx); |
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91 | void drm_modeset_backoff(struct drm_modeset_acquire_ctx *ctx); |
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92 | int drm_modeset_backoff_interruptible(struct drm_modeset_acquire_ctx *ctx); |
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93 | |||
94 | /** |
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95 | * drm_modeset_lock_init - initialize lock |
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96 | * @lock: lock to init |
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97 | */ |
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98 | static inline void drm_modeset_lock_init(struct drm_modeset_lock *lock) |
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99 | { |
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100 | ww_mutex_init(&lock->mutex, &crtc_ww_class); |
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101 | INIT_LIST_HEAD(&lock->head); |
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102 | } |
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103 | |||
104 | /** |
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105 | * drm_modeset_lock_fini - cleanup lock |
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106 | * @lock: lock to cleanup |
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107 | */ |
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108 | static inline void drm_modeset_lock_fini(struct drm_modeset_lock *lock) |
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109 | { |
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110 | WARN_ON(!list_empty(&lock->head)); |
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111 | } |
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112 | |||
113 | /** |
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114 | * drm_modeset_is_locked - equivalent to mutex_is_locked() |
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115 | * @lock: lock to check |
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116 | */ |
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117 | static inline bool drm_modeset_is_locked(struct drm_modeset_lock *lock) |
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118 | { |
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119 | return ww_mutex_is_locked(&lock->mutex); |
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120 | } |
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121 | |||
122 | int drm_modeset_lock(struct drm_modeset_lock *lock, |
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123 | struct drm_modeset_acquire_ctx *ctx); |
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124 | int drm_modeset_lock_interruptible(struct drm_modeset_lock *lock, |
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125 | struct drm_modeset_acquire_ctx *ctx); |
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126 | void drm_modeset_unlock(struct drm_modeset_lock *lock); |
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127 | |||
128 | struct drm_device; |
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5270 | serge | 129 | struct drm_crtc; |
130 | struct drm_plane; |
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131 | |||
132 | void drm_modeset_lock_all(struct drm_device *dev); |
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133 | void drm_modeset_unlock_all(struct drm_device *dev); |
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134 | void drm_modeset_lock_crtc(struct drm_crtc *crtc, |
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135 | struct drm_plane *plane); |
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136 | void drm_modeset_unlock_crtc(struct drm_crtc *crtc); |
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137 | void drm_warn_on_modeset_not_all_locked(struct drm_device *dev); |
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138 | struct drm_modeset_acquire_ctx * |
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139 | drm_modeset_legacy_acquire_ctx(struct drm_crtc *crtc); |
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140 | |||
5056 | serge | 141 | int drm_modeset_lock_all_crtcs(struct drm_device *dev, |
142 | struct drm_modeset_acquire_ctx *ctx); |
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143 | |||
144 | #endif /* DRM_MODESET_LOCK_H_ */ |