/*
* 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"
struct drm_syncobj_cb;
/* Move the define here for the moment to avoid exposing the UAPI just yet */
#define DRM_SYNCOBJ_CREATE_TYPE_TIMELINE (1 << 1)
enum drm_syncobj_type {
DRM_SYNCOBJ_TYPE_BINARY,
DRM_SYNCOBJ_TYPE_TIMELINE
};
/**
* struct drm_syncobj - sync object.
*
* This structure defines a generic sync object which is timeline based.
*/
struct drm_syncobj {
/**
* @refcount: Reference count of this object.
*/
struct kref refcount;
/**
* @type: indicate syncobj type
*/
enum drm_syncobj_type type;
/**
* @wq: wait signal operation work queue
*/
wait_queue_head_t wq;
/**
* @timeline_context: fence context used by timeline
*/
u64 timeline_context;
/**
* @timeline: syncobj timeline value, which indicates point is signaled.
*/
u64 timeline;
/**
* @signal_point: which indicates the latest signaler point.
*/
u64 signal_point;
/**
* @signal_pt_list: signaler point list.
*/
struct list_head signal_pt_list;
/**
* @cb_list: List of callbacks to call when the &fence gets replaced.
*/
struct list_head cb_list;
/**
* @pt_lock: Protects pt list.
*/
spinlock_t pt_lock;
/**
* @cb_mutex: Protects syncobj cb list.
*/
struct mutex cb_mutex;
/**
* @file: A file backing for this syncobj.
*/
struct file *file;
};
typedef void (*drm_syncobj_func_t)(struct drm_syncobj *syncobj,
struct drm_syncobj_cb *cb);
/**
* struct drm_syncobj_cb - callback for drm_syncobj_add_callback
* @node: used by drm_syncob_add_callback to append this struct to
* &drm_syncobj.cb_list
* @func: drm_syncobj_func_t to call
*
* This struct will be initialized by drm_syncobj_add_callback, additional
* data can be passed along by embedding drm_syncobj_cb in another struct.
* The callback will get called the next time drm_syncobj_replace_fence is
* called.
*/
struct drm_syncobj_cb {
struct list_head node;
drm_syncobj_func_t func;
};
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);
}
struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
u32 handle);
void drm_syncobj_replace_fence(struct drm_syncobj *syncobj, u64 point,
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);
int drm_syncobj_search_fence(struct drm_syncobj *syncobj, u64 point, u64 flags,
struct dma_fence **fence);
#endif
