4 * Copyright (C) 2012 Google, Inc.
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
16 #include <linux/types.h>
17 #include <linux/kref.h>
18 #include <linux/ktime.h>
19 #include <linux/list.h>
20 #include <linux/spinlock.h>
21 #include <linux/wait.h>
22 #include <linux/fence.h>
24 #include "uapi/sync.h"
31 * struct sync_timeline_ops - sync object implementation ops
32 * @driver_name: name of the implementation
33 * @has_signaled: returns:
34 * 1 if pt has signaled
35 * 0 if pt has not signaled
37 * @fill_driver_data: write implementation specific driver data to data.
38 * should return an error if there is not enough room
39 * as specified by size. This information is returned
40 * to userspace by SYNC_IOC_FENCE_INFO.
41 * @timeline_value_str: fill str with the value of the sync_timeline's counter
42 * @pt_value_str: fill str with the value of the sync_pt
44 struct sync_timeline_ops {
45 const char *driver_name;
48 int (*has_signaled)(struct sync_pt *pt);
51 int (*fill_driver_data)(struct sync_pt *syncpt, void *data, int size);
54 void (*timeline_value_str)(struct sync_timeline *timeline, char *str,
58 void (*pt_value_str)(struct sync_pt *pt, char *str, int size);
62 * struct sync_timeline - sync object
63 * @kref: reference count on fence.
64 * @ops: ops that define the implementation of the sync_timeline
65 * @name: name of the sync_timeline. Useful for debugging
66 * @destroyed: set when sync_timeline is destroyed
67 * @child_list_head: list of children sync_pts for this sync_timeline
68 * @child_list_lock: lock protecting @child_list_head, destroyed, and
70 * @active_list_head: list of active (unsignaled/errored) sync_pts
71 * @sync_timeline_list: membership in global sync_timeline_list
73 struct sync_timeline {
75 const struct sync_timeline_ops *ops;
78 /* protected by child_list_lock */
82 struct list_head child_list_head;
83 spinlock_t child_list_lock;
85 struct list_head active_list_head;
87 #ifdef CONFIG_DEBUG_FS
88 struct list_head sync_timeline_list;
93 * struct sync_pt - sync point
94 * @base: base fence class
95 * @child_list: membership in sync_timeline.child_list_head
96 * @active_list: membership in sync_timeline.active_list_head
101 struct list_head child_list;
102 struct list_head active_list;
105 static inline struct sync_timeline *sync_pt_parent(struct sync_pt *pt)
107 return container_of(pt->base.lock, struct sync_timeline,
111 struct sync_file_cb {
113 struct fence *sync_pt;
114 struct sync_file *sync_file;
118 * struct sync_file - sync file to export to the userspace
119 * @file: file representing this fence
120 * @kref: reference count on fence.
121 * @name: name of sync_file. Useful for debugging
122 * @sync_file_list: membership in global file list
123 * @num_fences number of sync_pts in the fence
124 * @wq: wait queue for fence signaling
125 * @status: 0: signaled, >0:active, <0: error
126 * @cbs: sync_pts callback information
132 #ifdef CONFIG_DEBUG_FS
133 struct list_head sync_file_list;
137 wait_queue_head_t wq;
140 struct sync_file_cb cbs[];
144 * API for sync_timeline implementers
148 * sync_timeline_create() - creates a sync object
149 * @ops: specifies the implementation ops for the object
150 * @size: size to allocate for this obj
151 * @name: sync_timeline name
153 * Creates a new sync_timeline which will use the implementation specified by
154 * @ops. @size bytes will be allocated allowing for implementation specific
155 * data to be kept after the generic sync_timeline struct. Returns the
156 * sync_timeline object or NULL in case of error.
158 struct sync_timeline *sync_timeline_create(const struct sync_timeline_ops *ops,
159 int size, const char *name);
162 * sync_timeline_destroy() - destroys a sync object
163 * @obj: sync_timeline to destroy
165 * A sync implementation should call this when the @obj is going away
166 * (i.e. module unload.) @obj won't actually be freed until all its children
167 * sync_pts are freed.
169 void sync_timeline_destroy(struct sync_timeline *obj);
172 * sync_timeline_signal() - signal a status change on a sync_timeline
173 * @obj: sync_timeline to signal
175 * A sync implementation should call this any time one of it's sync_pts
176 * has signaled or has an error condition.
178 void sync_timeline_signal(struct sync_timeline *obj);
181 * sync_pt_create() - creates a sync pt
182 * @parent: sync_pt's parent sync_timeline
183 * @size: size to allocate for this pt
185 * Creates a new sync_pt as a child of @parent. @size bytes will be
186 * allocated allowing for implementation specific data to be kept after
187 * the generic sync_timeline struct. Returns the sync_pt object or
188 * NULL in case of error.
190 struct sync_pt *sync_pt_create(struct sync_timeline *parent, int size);
193 * sync_pt_free() - frees a sync pt
194 * @pt: sync_pt to free
196 * This should only be called on sync_pts which have been created but
197 * not added to a fence.
199 void sync_pt_free(struct sync_pt *pt);
202 * sync_file_create() - creates a sync file
203 * @name: name of file to create
204 * @pt: sync_pt to add to the file
206 * Creates a sync_file containg @pt. Once this is called, the sync_file takes
209 struct sync_file *sync_file_create(const char *name, struct sync_pt *pt);
212 * sync_file_create_dma() - creates a sync file from dma-fence
213 * @name: name of file to create
214 * @pt: dma-fence to add to the file
216 * Creates a sync_file containg @pt. Once this is called, the fence takes
219 struct sync_file *sync_file_create_dma(const char *name, struct fence *pt);
222 * API for sync_file consumers
226 * sync_file_merge() - merge two sync_files
227 * @name: name of new fence
231 * Creates a new sync_file which contains copies of all the sync_pts in both
232 * @a and @b. @a and @b remain valid, independent sync_file. Returns the
233 * new merged sync_file or NULL in case of error.
235 struct sync_file *sync_file_merge(const char *name,
236 struct sync_file *a, struct sync_file *b);
239 * sync_file_fdget() - get a sync_file from an fd
240 * @fd: fd referencing a fence
242 * Ensures @fd references a valid sync_file, increments the refcount of the
243 * backing file. Returns the sync_file or NULL in case of error.
245 struct sync_file *sync_file_fdget(int fd);
248 * sync_file_put() - puts a reference of a sync_file
249 * @sync_file: sync_file to put
251 * Puts a reference on @sync_fence. If this is the last reference, the
252 * sync_fil and all it's sync_pts will be freed
254 void sync_file_put(struct sync_file *sync_file);
257 * sync_file_install() - installs a sync_file into a file descriptor
258 * @sync_file: sync_file to install
259 * @fd: file descriptor in which to install the fence
261 * Installs @sync_file into @fd. @fd's should be acquired through
262 * get_unused_fd_flags(O_CLOEXEC).
264 void sync_file_install(struct sync_file *sync_file, int fd);
267 * sync_file_wait() - wait on sync file
268 * @sync_file: file to wait on
269 * @tiemout: timeout in ms
271 * Wait for @sync_file to be signaled or have an error. Waits indefinitely
274 * Returns 0 if fence signaled, > 0 if it is still active and <0 on error
276 int sync_file_wait(struct sync_file *sync_file, long timeout);
278 #ifdef CONFIG_DEBUG_FS
280 void sync_timeline_debug_add(struct sync_timeline *obj);
281 void sync_timeline_debug_remove(struct sync_timeline *obj);
282 void sync_file_debug_add(struct sync_file *fence);
283 void sync_file_debug_remove(struct sync_file *fence);
284 void sync_dump(void);
287 # define sync_timeline_debug_add(obj)
288 # define sync_timeline_debug_remove(obj)
289 # define sync_file_debug_add(fence)
290 # define sync_file_debug_remove(fence)
294 #endif /* _LINUX_SYNC_H */