147 lines
4.3 KiB
C
147 lines
4.3 KiB
C
/*
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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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struct drm_syncobj_cb;
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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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typedef void (*drm_syncobj_func_t)(struct drm_syncobj *syncobj,
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struct drm_syncobj_cb *cb);
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/**
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* struct drm_syncobj_cb - callback for drm_syncobj_add_callback
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* @node: used by drm_syncob_add_callback to append this struct to
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* &drm_syncobj.cb_list
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* @func: drm_syncobj_func_t to call
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*
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* This struct will be initialized by drm_syncobj_add_callback, additional
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* data can be passed along by embedding drm_syncobj_cb in another struct.
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* The callback will get called the next time drm_syncobj_replace_fence is
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* called.
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*/
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struct drm_syncobj_cb {
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struct list_head node;
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drm_syncobj_func_t func;
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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_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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