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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/drm/drm_modeset_lock.h
2 * Copyright (C) 2014 Red Hat
3 * Author: Rob Clark <robdclark@gmail.com>
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:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
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.
24 #ifndef DRM_MODESET_LOCK_H_
25 #define DRM_MODESET_LOCK_H_
27 #include <linux/ww_mutex.h>
29 struct drm_modeset_lock
;
32 * struct drm_modeset_acquire_ctx - locking context (see ww_acquire_ctx)
33 * @ww_ctx: base acquire ctx
34 * @contended: used internally for -EDEADLK handling
35 * @locked: list of held locks
36 * @trylock_only: trylock mode used in atomic contexts/panic notifiers
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
42 struct drm_modeset_acquire_ctx
{
44 struct ww_acquire_ctx ww_ctx
;
47 * Contended lock: if a lock is contended you should only call
48 * drm_modeset_backoff() which drops locks and slow-locks the
51 struct drm_modeset_lock
*contended
;
54 * list of held locks (drm_modeset_lock)
56 struct list_head locked
;
59 * Trylock mode, use only for panic handlers!
65 * struct drm_modeset_lock - used for locking modeset resources.
66 * @mutex: resource locking
67 * @head: used to hold it's place on &drm_atomi_state.locked list when
68 * part of an atomic update
70 * Used for locking CRTCs and other modeset resources.
72 struct drm_modeset_lock
{
76 struct ww_mutex mutex
;
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).
82 struct list_head head
;
85 void drm_modeset_acquire_init(struct drm_modeset_acquire_ctx
*ctx
,
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
);
92 void drm_modeset_lock_init(struct drm_modeset_lock
*lock
);
95 * drm_modeset_lock_fini - cleanup lock
96 * @lock: lock to cleanup
98 static inline void drm_modeset_lock_fini(struct drm_modeset_lock
*lock
)
100 WARN_ON(!list_empty(&lock
->head
));
104 * drm_modeset_is_locked - equivalent to mutex_is_locked()
105 * @lock: lock to check
107 static inline bool drm_modeset_is_locked(struct drm_modeset_lock
*lock
)
109 return ww_mutex_is_locked(&lock
->mutex
);
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
);
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
);
126 int drm_modeset_lock_all_ctx(struct drm_device
*dev
,
127 struct drm_modeset_acquire_ctx
*ctx
);
129 #endif /* DRM_MODESET_LOCK_H_ */