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/*
* Copyright © 2017 Red Hat
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
*
*/
#ifndef __DRM_SYNCOBJ_H__
#define __DRM_SYNCOBJ_H__
#include <linux/dma-fence.h>
#include <linux/dma-fence-chain.h>
struct drm_file;
/**
* struct drm_syncobj - sync object.
*
* This structure defines a generic sync object which wraps a &dma_fence.
*/
struct drm_syncobj {
/**
* @refcount: Reference count of this object.
*/
struct kref refcount;
/**
* @fence:
* NULL or a pointer to the fence bound to this object.
*
* This field should not be used directly. Use drm_syncobj_fence_get()
* and drm_syncobj_replace_fence() instead.
*/
struct dma_fence __rcu *fence;
/**
* @cb_list: List of callbacks to call when the &fence gets replaced.
*/
struct list_head cb_list;
/**
* @ev_fd_list: List of registered eventfd.
*/
struct list_head ev_fd_list;
/**
* @lock: Protects &cb_list and &ev_fd_list, and write-locks &fence.
*/
spinlock_t lock;
/**
* @file: A file backing for this syncobj.
*/
struct file *file;
};
void drm_syncobj_free(struct kref *kref);
/**
* drm_syncobj_get - acquire a syncobj reference
* @obj: sync object
*
* This acquires an additional reference to @obj. It is illegal to call this
* without already holding a reference. No locks required.
*/
static inline void
drm_syncobj_get(struct drm_syncobj *obj)
{
kref_get(&obj->refcount);
}
/**
* drm_syncobj_put - release a reference to a sync object.
* @obj: sync object.
*/
static inline void
drm_syncobj_put(struct drm_syncobj *obj)
{
kref_put(&obj->refcount, drm_syncobj_free);
}
/**
* drm_syncobj_fence_get - get a reference to a fence in a sync object
* @syncobj: sync object.
*
* This acquires additional reference to &drm_syncobj.fence contained in @obj,
* if not NULL. It is illegal to call this without already holding a reference.
* No locks required.
*
* Returns:
* Either the fence of @obj or NULL if there's none.
*/
static inline struct dma_fence *
drm_syncobj_fence_get(struct drm_syncobj *syncobj)
{
struct dma_fence *fence;
rcu_read_lock();
fence = dma_fence_get_rcu_safe(&syncobj->fence);
rcu_read_unlock();
return fence;
}
struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
u32 handle);
void drm_syncobj_add_point(struct drm_syncobj *syncobj,
struct dma_fence_chain *chain,
struct dma_fence *fence,
uint64_t point);
void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
struct dma_fence *fence);
int drm_syncobj_find_fence(struct drm_file *file_private,
u32 handle, u64 point, u64 flags,
struct dma_fence **fence);
void drm_syncobj_free(struct kref *kref);
int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
struct dma_fence *fence);
int drm_syncobj_get_handle(struct drm_file *file_private,
struct drm_syncobj *syncobj, u32 *handle);
int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd);
#endif
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