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144 lines
4.3 KiB
144 lines
4.3 KiB
/* |
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* Copyright (C) 2014 Red Hat |
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* Author: Rob Clark <[email protected]> |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a |
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* copy of this software and associated documentation files (the "Software"), |
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* to deal in the Software without restriction, including without limitation |
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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* and/or sell copies of the Software, and to permit persons to whom the |
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* Software is furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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* OTHER DEALINGS IN THE SOFTWARE. |
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*/ |
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#ifndef DRM_MODESET_LOCK_H_ |
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#define DRM_MODESET_LOCK_H_ |
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#include <linux/ww_mutex.h> |
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struct drm_modeset_lock; |
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/** |
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* struct drm_modeset_acquire_ctx - locking context (see ww_acquire_ctx) |
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* @ww_ctx: base acquire ctx |
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* @contended: used internally for -EDEADLK handling |
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* @locked: list of held locks |
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* @trylock_only: trylock mode used in atomic contexts/panic notifiers |
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* |
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* Each thread competing for a set of locks must use one acquire |
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* ctx. And if any lock fxn returns -EDEADLK, it must backoff and |
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* retry. |
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*/ |
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struct drm_modeset_acquire_ctx { |
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struct ww_acquire_ctx ww_ctx; |
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/* |
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* Contended lock: if a lock is contended you should only call |
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* drm_modeset_backoff() which drops locks and slow-locks the |
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* contended lock. |
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*/ |
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struct drm_modeset_lock *contended; |
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/* |
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* list of held locks (drm_modeset_lock) |
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*/ |
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struct list_head locked; |
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/* |
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* Trylock mode, use only for panic handlers! |
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*/ |
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bool trylock_only; |
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}; |
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/** |
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* struct drm_modeset_lock - used for locking modeset resources. |
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* @mutex: resource locking |
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* @head: used to hold it's place on state->locked list when |
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* part of an atomic update |
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* |
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* Used for locking CRTCs and other modeset resources. |
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*/ |
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struct drm_modeset_lock { |
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/* |
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* modeset lock |
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*/ |
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struct ww_mutex mutex; |
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/* |
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* Resources that are locked as part of an atomic update are added |
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* to a list (so we know what to unlock at the end). |
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*/ |
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struct list_head head; |
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}; |
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extern struct ww_class crtc_ww_class; |
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void drm_modeset_acquire_init(struct drm_modeset_acquire_ctx *ctx, |
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uint32_t flags); |
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void drm_modeset_acquire_fini(struct drm_modeset_acquire_ctx *ctx); |
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void drm_modeset_drop_locks(struct drm_modeset_acquire_ctx *ctx); |
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void drm_modeset_backoff(struct drm_modeset_acquire_ctx *ctx); |
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int drm_modeset_backoff_interruptible(struct drm_modeset_acquire_ctx *ctx); |
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/** |
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* drm_modeset_lock_init - initialize lock |
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* @lock: lock to init |
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*/ |
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static inline void drm_modeset_lock_init(struct drm_modeset_lock *lock) |
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{ |
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ww_mutex_init(&lock->mutex, &crtc_ww_class); |
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INIT_LIST_HEAD(&lock->head); |
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} |
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/** |
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* drm_modeset_lock_fini - cleanup lock |
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* @lock: lock to cleanup |
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*/ |
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static inline void drm_modeset_lock_fini(struct drm_modeset_lock *lock) |
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{ |
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WARN_ON(!list_empty(&lock->head)); |
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} |
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/** |
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* drm_modeset_is_locked - equivalent to mutex_is_locked() |
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* @lock: lock to check |
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*/ |
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static inline bool drm_modeset_is_locked(struct drm_modeset_lock *lock) |
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{ |
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return ww_mutex_is_locked(&lock->mutex); |
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} |
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int drm_modeset_lock(struct drm_modeset_lock *lock, |
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struct drm_modeset_acquire_ctx *ctx); |
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int drm_modeset_lock_interruptible(struct drm_modeset_lock *lock, |
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struct drm_modeset_acquire_ctx *ctx); |
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void drm_modeset_unlock(struct drm_modeset_lock *lock); |
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struct drm_device; |
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struct drm_crtc; |
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struct drm_plane; |
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void drm_modeset_lock_all(struct drm_device *dev); |
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void drm_modeset_unlock_all(struct drm_device *dev); |
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void drm_modeset_lock_crtc(struct drm_crtc *crtc, |
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struct drm_plane *plane); |
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void drm_modeset_unlock_crtc(struct drm_crtc *crtc); |
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void drm_warn_on_modeset_not_all_locked(struct drm_device *dev); |
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struct drm_modeset_acquire_ctx * |
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drm_modeset_legacy_acquire_ctx(struct drm_crtc *crtc); |
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int drm_modeset_lock_all_ctx(struct drm_device *dev, |
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struct drm_modeset_acquire_ctx *ctx); |
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#endif /* DRM_MODESET_LOCK_H_ */
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