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132 lines
3.9 KiB
132 lines
3.9 KiB
/* |
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* Copyright © 2017 Red Hat |
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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 (including the next |
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* paragraph) shall be included in all copies or substantial portions of the |
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* 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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
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* IN THE SOFTWARE. |
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* |
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* Authors: |
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* |
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*/ |
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#ifndef __DRM_SYNCOBJ_H__ |
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#define __DRM_SYNCOBJ_H__ |
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#include <linux/dma-fence.h> |
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#include <linux/dma-fence-chain.h> |
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struct drm_file; |
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/** |
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* struct drm_syncobj - sync object. |
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* |
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* This structure defines a generic sync object which wraps a &dma_fence. |
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*/ |
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struct drm_syncobj { |
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/** |
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* @refcount: Reference count of this object. |
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*/ |
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struct kref refcount; |
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/** |
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* @fence: |
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* NULL or a pointer to the fence bound to this object. |
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* |
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* This field should not be used directly. Use drm_syncobj_fence_get() |
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* and drm_syncobj_replace_fence() instead. |
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*/ |
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struct dma_fence __rcu *fence; |
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/** |
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* @cb_list: List of callbacks to call when the &fence gets replaced. |
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*/ |
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struct list_head cb_list; |
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/** |
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* @lock: Protects &cb_list and write-locks &fence. |
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*/ |
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spinlock_t lock; |
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/** |
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* @file: A file backing for this syncobj. |
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*/ |
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struct file *file; |
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}; |
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void drm_syncobj_free(struct kref *kref); |
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/** |
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* drm_syncobj_get - acquire a syncobj reference |
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* @obj: sync object |
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* |
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* This acquires an additional reference to @obj. It is illegal to call this |
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* without already holding a reference. No locks required. |
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*/ |
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static inline void |
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drm_syncobj_get(struct drm_syncobj *obj) |
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{ |
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kref_get(&obj->refcount); |
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} |
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/** |
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* drm_syncobj_put - release a reference to a sync object. |
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* @obj: sync object. |
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*/ |
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static inline void |
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drm_syncobj_put(struct drm_syncobj *obj) |
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{ |
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kref_put(&obj->refcount, drm_syncobj_free); |
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} |
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/** |
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* drm_syncobj_fence_get - get a reference to a fence in a sync object |
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* @syncobj: sync object. |
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* |
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* This acquires additional reference to &drm_syncobj.fence contained in @obj, |
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* if not NULL. It is illegal to call this without already holding a reference. |
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* No locks required. |
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* |
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* Returns: |
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* Either the fence of @obj or NULL if there's none. |
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*/ |
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static inline struct dma_fence * |
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drm_syncobj_fence_get(struct drm_syncobj *syncobj) |
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{ |
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struct dma_fence *fence; |
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rcu_read_lock(); |
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fence = dma_fence_get_rcu_safe(&syncobj->fence); |
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rcu_read_unlock(); |
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return fence; |
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} |
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struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private, |
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u32 handle); |
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void drm_syncobj_add_point(struct drm_syncobj *syncobj, |
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struct dma_fence_chain *chain, |
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struct dma_fence *fence, |
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uint64_t point); |
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void drm_syncobj_replace_fence(struct drm_syncobj *syncobj, |
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struct dma_fence *fence); |
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int drm_syncobj_find_fence(struct drm_file *file_private, |
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u32 handle, u64 point, u64 flags, |
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struct dma_fence **fence); |
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void drm_syncobj_free(struct kref *kref); |
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int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags, |
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struct dma_fence *fence); |
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int drm_syncobj_get_handle(struct drm_file *file_private, |
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struct drm_syncobj *syncobj, u32 *handle); |
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int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd); |
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#endif
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