drm_syncobj.h

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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:
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 */
#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 {
    struct kref refcount;
    struct dma_fence __rcu *fence;
    struct list_head cb_list;
    struct list_head ev_fd_list;
    spinlock_t lock;
    struct file *file;
};
 
void drm_syncobj_free(struct kref *kref);
 
static inline void
drm_syncobj_get(struct drm_syncobj *obj)
{
    kref_get(&obj->refcount);
}
 
static inline void
drm_syncobj_put(struct drm_syncobj *obj)
{
    kref_put(&obj->refcount, drm_syncobj_free);
}
 
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