134 lines
4 KiB
C
134 lines
4 KiB
C
/*
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* Copyright (C) 2014 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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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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* @interruptible: whether interruptible locking should be used.
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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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/* Perform interruptible waits on this context. */
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bool interruptible;
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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 &drm_atomi_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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#define DRM_MODESET_ACQUIRE_INTERRUPTIBLE BIT(0)
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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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int drm_modeset_backoff(struct drm_modeset_acquire_ctx *ctx);
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void drm_modeset_lock_init(struct drm_modeset_lock *lock);
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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 __must_check drm_modeset_lock_single_interruptible(struct drm_modeset_lock *lock);
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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_warn_on_modeset_not_all_locked(struct drm_device *dev);
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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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