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  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. /**
  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
  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.  
  46.         /*
  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.  
  53.         /*
  54.          * list of held locks (drm_modeset_lock)
  55.          */
  56.         struct list_head locked;
  57.  
  58.         /*
  59.          * Trylock mode, use only for panic handlers!
  60.          */
  61.         bool trylock_only;
  62. };
  63.  
  64. /**
  65.  * struct drm_modeset_lock - used for locking modeset resources.
  66.  * @mutex: resource locking
  67.  * @head: used to hold it's place on state->locked list when
  68.  *    part of an atomic update
  69.  *
  70.  * Used for locking CRTCs and other modeset resources.
  71.  */
  72. struct drm_modeset_lock {
  73.         /*
  74.          * modeset lock
  75.          */
  76.         struct ww_mutex mutex;
  77.  
  78.         /*
  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.  
  85. extern struct ww_class crtc_ww_class;
  86.  
  87. void drm_modeset_acquire_init(struct drm_modeset_acquire_ctx *ctx,
  88.                 uint32_t flags);
  89. void drm_modeset_acquire_fini(struct drm_modeset_acquire_ctx *ctx);
  90. void drm_modeset_drop_locks(struct drm_modeset_acquire_ctx *ctx);
  91. void drm_modeset_backoff(struct drm_modeset_acquire_ctx *ctx);
  92. int drm_modeset_backoff_interruptible(struct drm_modeset_acquire_ctx *ctx);
  93.  
  94. /**
  95.  * drm_modeset_lock_init - initialize lock
  96.  * @lock: lock to init
  97.  */
  98. static inline void drm_modeset_lock_init(struct drm_modeset_lock *lock)
  99. {
  100.         ww_mutex_init(&lock->mutex, &crtc_ww_class);
  101.         INIT_LIST_HEAD(&lock->head);
  102. }
  103.  
  104. /**
  105.  * drm_modeset_lock_fini - cleanup lock
  106.  * @lock: lock to cleanup
  107.  */
  108. static inline void drm_modeset_lock_fini(struct drm_modeset_lock *lock)
  109. {
  110.         WARN_ON(!list_empty(&lock->head));
  111. }
  112.  
  113. /**
  114.  * drm_modeset_is_locked - equivalent to mutex_is_locked()
  115.  * @lock: lock to check
  116.  */
  117. static inline bool drm_modeset_is_locked(struct drm_modeset_lock *lock)
  118. {
  119.         return ww_mutex_is_locked(&lock->mutex);
  120. }
  121.  
  122. int drm_modeset_lock(struct drm_modeset_lock *lock,
  123.                 struct drm_modeset_acquire_ctx *ctx);
  124. int drm_modeset_lock_interruptible(struct drm_modeset_lock *lock,
  125.                 struct drm_modeset_acquire_ctx *ctx);
  126. void drm_modeset_unlock(struct drm_modeset_lock *lock);
  127.  
  128. struct drm_device;
  129. struct drm_crtc;
  130. struct drm_plane;
  131.  
  132. void drm_modeset_lock_all(struct drm_device *dev);
  133. void drm_modeset_unlock_all(struct drm_device *dev);
  134. void drm_modeset_lock_crtc(struct drm_crtc *crtc,
  135.                            struct drm_plane *plane);
  136. void drm_modeset_unlock_crtc(struct drm_crtc *crtc);
  137. void drm_warn_on_modeset_not_all_locked(struct drm_device *dev);
  138. struct drm_modeset_acquire_ctx *
  139. drm_modeset_legacy_acquire_ctx(struct drm_crtc *crtc);
  140.  
  141. int drm_modeset_lock_all_ctx(struct drm_device *dev,
  142.                              struct drm_modeset_acquire_ctx *ctx);
  143.  
  144. #endif /* DRM_MODESET_LOCK_H_ */
  145.