/* * include/linux/sync.h * * Copyright (C) 2012 Google, Inc. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * */ #ifndef _LINUX_SYNC_H#define _LINUX_SYNC_H #include <linux/types.h>#include <linux/kref.h>#include <linux/ktime.h>#include <linux/list.h>#include <linux/spinlock.h>#include <linux/fence.h> #include <linux/sync_file.h>#include <uapi/linux/sync_file.h> struct sync_timeline; /** * struct sync_timeline_ops - sync object implementation ops * @driver_name:	name of the implementation * @has_signaled:	returns: *			  1 if pt has signaled *			  0 if pt has not signaled *			 <0 on error * @timeline_value_str: fill str with the value of the sync_timeline's counter * @fence_value_str:	fill str with the value of the fence */struct sync_timeline_ops {	const char *driver_name; 	/* required */	int (*has_signaled)(struct fence *fence); 	/* optional */	void (*timeline_value_str)(struct sync_timeline *timeline, char *str,				   int size); 	/* optional */	void (*fence_value_str)(struct fence *fence, char *str, int size);}; /** * struct sync_timeline - sync object * @kref:		reference count on fence. * @ops:		ops that define the implementation of the sync_timeline * @name:		name of the sync_timeline. Useful for debugging * @destroyed:		set when sync_timeline is destroyed * @child_list_head:	list of children sync_pts for this sync_timeline * @child_list_lock:	lock protecting @child_list_head, destroyed, and *			fence.status * @active_list_head:	list of active (unsignaled/errored) sync_pts * @sync_timeline_list:	membership in global sync_timeline_list */struct sync_timeline {	struct kref		kref;	const struct sync_timeline_ops	*ops;	char			name[32]; 	/* protected by child_list_lock */	bool			destroyed;	int			context, value; 	struct list_head	child_list_head;	spinlock_t		child_list_lock; 	struct list_head	active_list_head; #ifdef CONFIG_DEBUG_FS	struct list_head	sync_timeline_list;#endif}; static inline struct sync_timeline *fence_parent(struct fence *fence){	return container_of(fence->lock, struct sync_timeline,			    child_list_lock);} /* * API for sync_timeline implementers */ /** * sync_timeline_create() - creates a sync object * @ops:	specifies the implementation ops for the object * @size:	size to allocate for this obj * @name:	sync_timeline name * * Creates a new sync_timeline which will use the implementation specified by * @ops.  @size bytes will be allocated allowing for implementation specific * data to be kept after the generic sync_timeline struct. Returns the * sync_timeline object or NULL in case of error. */struct sync_timeline *sync_timeline_create(const struct sync_timeline_ops *ops,					   int size, const char *name); /** * sync_timeline_destroy() - destroys a sync object * @obj:	sync_timeline to destroy * * A sync implementation should call this when the @obj is going away * (i.e. module unload.)  @obj won't actually be freed until all its children * fences are freed. */void sync_timeline_destroy(struct sync_timeline *obj); /** * sync_timeline_signal() - signal a status change on a sync_timeline * @obj:	sync_timeline to signal * * A sync implementation should call this any time one of it's fences * has signaled or has an error condition. */void sync_timeline_signal(struct sync_timeline *obj); /** * sync_pt_create() - creates a sync pt * @parent:	fence's parent sync_timeline * @size:	size to allocate for this pt * * Creates a new fence as a child of @parent.  @size bytes will be * allocated allowing for implementation specific data to be kept after * the generic sync_timeline struct. Returns the fence object or * NULL in case of error. */struct fence *sync_pt_create(struct sync_timeline *parent, int size); #ifdef CONFIG_DEBUG_FS void sync_timeline_debug_add(struct sync_timeline *obj);void sync_timeline_debug_remove(struct sync_timeline *obj);void sync_file_debug_add(struct sync_file *fence);void sync_file_debug_remove(struct sync_file *fence);void sync_dump(void); #else# define sync_timeline_debug_add(obj)# define sync_timeline_debug_remove(obj)# define sync_file_debug_add(fence)# define sync_file_debug_remove(fence)# define sync_dump()#endif #endif /* _LINUX_SYNC_H */