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1 | /* |
2 | * Copyright 2017 Red Hat | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice (including the next | |
12 | * paragraph) shall be included in all copies or substantial portions of the | |
13 | * Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
21 | * IN THE SOFTWARE. | |
22 | * | |
23 | * Authors: | |
24 | * | |
25 | */ | |
26 | ||
27 | /** | |
28 | * DOC: Overview | |
29 | * | |
30 | * DRM synchronisation objects (syncobj) are a persistent objects, | |
31 | * that contain an optional fence. The fence can be updated with a new | |
32 | * fence, or be NULL. | |
33 | * | |
34 | * syncobj's can be export to fd's and back, these fd's are opaque and | |
35 | * have no other use case, except passing the syncobj between processes. | |
36 | * | |
37 | * Their primary use-case is to implement Vulkan fences and semaphores. | |
38 | * | |
39 | * syncobj have a kref reference count, but also have an optional file. | |
40 | * The file is only created once the syncobj is exported. | |
41 | * The file takes a reference on the kref. | |
42 | */ | |
43 | ||
44 | #include <drm/drmP.h> | |
45 | #include <linux/file.h> | |
46 | #include <linux/fs.h> | |
47 | #include <linux/anon_inodes.h> | |
48 | ||
49 | #include "drm_internal.h" | |
50 | #include <drm/drm_syncobj.h> | |
51 | ||
52 | /** | |
53 | * drm_syncobj_find - lookup and reference a sync object. | |
54 | * @file_private: drm file private pointer | |
55 | * @handle: sync object handle to lookup. | |
56 | * | |
57 | * Returns a reference to the syncobj pointed to by handle or NULL. | |
58 | */ | |
59 | struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private, | |
60 | u32 handle) | |
61 | { | |
62 | struct drm_syncobj *syncobj; | |
63 | ||
64 | spin_lock(&file_private->syncobj_table_lock); | |
65 | ||
66 | /* Check if we currently have a reference on the object */ | |
67 | syncobj = idr_find(&file_private->syncobj_idr, handle); | |
68 | if (syncobj) | |
69 | drm_syncobj_get(syncobj); | |
70 | ||
71 | spin_unlock(&file_private->syncobj_table_lock); | |
72 | ||
73 | return syncobj; | |
74 | } | |
75 | EXPORT_SYMBOL(drm_syncobj_find); | |
76 | ||
77 | /** | |
78 | * drm_syncobj_replace_fence - replace fence in a sync object. | |
79 | * @file_private: drm file private pointer. | |
80 | * @syncobj: Sync object to replace fence in | |
81 | * @fence: fence to install in sync file. | |
82 | * | |
83 | * This replaces the fence on a sync object. | |
84 | */ | |
85 | void drm_syncobj_replace_fence(struct drm_file *file_private, | |
86 | struct drm_syncobj *syncobj, | |
87 | struct dma_fence *fence) | |
88 | { | |
89 | struct dma_fence *old_fence = NULL; | |
90 | ||
91 | if (fence) | |
92 | dma_fence_get(fence); | |
93 | old_fence = xchg(&syncobj->fence, fence); | |
94 | ||
95 | dma_fence_put(old_fence); | |
96 | } | |
97 | EXPORT_SYMBOL(drm_syncobj_replace_fence); | |
98 | ||
99 | int drm_syncobj_fence_get(struct drm_file *file_private, | |
100 | u32 handle, | |
101 | struct dma_fence **fence) | |
102 | { | |
103 | struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle); | |
104 | int ret = 0; | |
105 | ||
106 | if (!syncobj) | |
107 | return -ENOENT; | |
108 | ||
109 | *fence = dma_fence_get(syncobj->fence); | |
110 | if (!*fence) { | |
111 | ret = -EINVAL; | |
112 | } | |
113 | drm_syncobj_put(syncobj); | |
114 | return ret; | |
115 | } | |
116 | EXPORT_SYMBOL(drm_syncobj_fence_get); | |
117 | ||
118 | /** | |
119 | * drm_syncobj_free - free a sync object. | |
120 | * @kref: kref to free. | |
121 | * | |
122 | * Only to be called from kref_put in drm_syncobj_put. | |
123 | */ | |
124 | void drm_syncobj_free(struct kref *kref) | |
125 | { | |
126 | struct drm_syncobj *syncobj = container_of(kref, | |
127 | struct drm_syncobj, | |
128 | refcount); | |
129 | dma_fence_put(syncobj->fence); | |
130 | kfree(syncobj); | |
131 | } | |
132 | EXPORT_SYMBOL(drm_syncobj_free); | |
133 | ||
134 | static int drm_syncobj_create(struct drm_file *file_private, | |
135 | u32 *handle) | |
136 | { | |
137 | int ret; | |
138 | struct drm_syncobj *syncobj; | |
139 | ||
140 | syncobj = kzalloc(sizeof(struct drm_syncobj), GFP_KERNEL); | |
141 | if (!syncobj) | |
142 | return -ENOMEM; | |
143 | ||
144 | kref_init(&syncobj->refcount); | |
145 | ||
146 | idr_preload(GFP_KERNEL); | |
147 | spin_lock(&file_private->syncobj_table_lock); | |
148 | ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT); | |
149 | spin_unlock(&file_private->syncobj_table_lock); | |
150 | ||
151 | idr_preload_end(); | |
152 | ||
153 | if (ret < 0) { | |
154 | drm_syncobj_put(syncobj); | |
155 | return ret; | |
156 | } | |
157 | ||
158 | *handle = ret; | |
159 | return 0; | |
160 | } | |
161 | ||
162 | static int drm_syncobj_destroy(struct drm_file *file_private, | |
163 | u32 handle) | |
164 | { | |
165 | struct drm_syncobj *syncobj; | |
166 | ||
167 | spin_lock(&file_private->syncobj_table_lock); | |
168 | syncobj = idr_remove(&file_private->syncobj_idr, handle); | |
169 | spin_unlock(&file_private->syncobj_table_lock); | |
170 | ||
171 | if (!syncobj) | |
172 | return -EINVAL; | |
173 | ||
174 | drm_syncobj_put(syncobj); | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static int drm_syncobj_file_release(struct inode *inode, struct file *file) | |
179 | { | |
180 | struct drm_syncobj *syncobj = file->private_data; | |
181 | ||
182 | drm_syncobj_put(syncobj); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static const struct file_operations drm_syncobj_file_fops = { | |
187 | .release = drm_syncobj_file_release, | |
188 | }; | |
189 | ||
190 | static int drm_syncobj_alloc_file(struct drm_syncobj *syncobj) | |
191 | { | |
192 | struct file *file = anon_inode_getfile("syncobj_file", | |
193 | &drm_syncobj_file_fops, | |
194 | syncobj, 0); | |
195 | if (IS_ERR(file)) | |
196 | return PTR_ERR(file); | |
197 | ||
198 | drm_syncobj_get(syncobj); | |
199 | if (cmpxchg(&syncobj->file, NULL, file)) { | |
200 | /* lost the race */ | |
201 | fput(file); | |
202 | } | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | static int drm_syncobj_handle_to_fd(struct drm_file *file_private, | |
208 | u32 handle, int *p_fd) | |
209 | { | |
210 | struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle); | |
211 | int ret; | |
212 | int fd; | |
213 | ||
214 | if (!syncobj) | |
215 | return -EINVAL; | |
216 | ||
217 | fd = get_unused_fd_flags(O_CLOEXEC); | |
218 | if (fd < 0) { | |
219 | drm_syncobj_put(syncobj); | |
220 | return fd; | |
221 | } | |
222 | ||
223 | if (!syncobj->file) { | |
224 | ret = drm_syncobj_alloc_file(syncobj); | |
225 | if (ret) | |
226 | goto out_put_fd; | |
227 | } | |
228 | fd_install(fd, syncobj->file); | |
229 | drm_syncobj_put(syncobj); | |
230 | *p_fd = fd; | |
231 | return 0; | |
232 | out_put_fd: | |
233 | put_unused_fd(fd); | |
234 | drm_syncobj_put(syncobj); | |
235 | return ret; | |
236 | } | |
237 | ||
238 | static struct drm_syncobj *drm_syncobj_fdget(int fd) | |
239 | { | |
240 | struct file *file = fget(fd); | |
241 | ||
242 | if (!file) | |
243 | return NULL; | |
244 | if (file->f_op != &drm_syncobj_file_fops) | |
245 | goto err; | |
246 | ||
247 | return file->private_data; | |
248 | err: | |
249 | fput(file); | |
250 | return NULL; | |
251 | }; | |
252 | ||
253 | static int drm_syncobj_fd_to_handle(struct drm_file *file_private, | |
254 | int fd, u32 *handle) | |
255 | { | |
256 | struct drm_syncobj *syncobj = drm_syncobj_fdget(fd); | |
257 | int ret; | |
258 | ||
259 | if (!syncobj) | |
260 | return -EINVAL; | |
261 | ||
262 | /* take a reference to put in the idr */ | |
263 | drm_syncobj_get(syncobj); | |
264 | ||
265 | idr_preload(GFP_KERNEL); | |
266 | spin_lock(&file_private->syncobj_table_lock); | |
267 | ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT); | |
268 | spin_unlock(&file_private->syncobj_table_lock); | |
269 | idr_preload_end(); | |
270 | ||
271 | if (ret < 0) { | |
272 | fput(syncobj->file); | |
273 | return ret; | |
274 | } | |
275 | *handle = ret; | |
276 | return 0; | |
277 | } | |
278 | ||
279 | /** | |
280 | * drm_syncobj_open - initalizes syncobj file-private structures at devnode open time | |
281 | * @dev: drm_device which is being opened by userspace | |
282 | * @file_private: drm file-private structure to set up | |
283 | * | |
284 | * Called at device open time, sets up the structure for handling refcounting | |
285 | * of sync objects. | |
286 | */ | |
287 | void | |
288 | drm_syncobj_open(struct drm_file *file_private) | |
289 | { | |
290 | idr_init(&file_private->syncobj_idr); | |
291 | spin_lock_init(&file_private->syncobj_table_lock); | |
292 | } | |
293 | ||
294 | static int | |
295 | drm_syncobj_release_handle(int id, void *ptr, void *data) | |
296 | { | |
297 | struct drm_syncobj *syncobj = ptr; | |
298 | ||
299 | drm_syncobj_put(syncobj); | |
300 | return 0; | |
301 | } | |
302 | ||
303 | /** | |
304 | * drm_syncobj_release - release file-private sync object resources | |
305 | * @dev: drm_device which is being closed by userspace | |
306 | * @file_private: drm file-private structure to clean up | |
307 | * | |
308 | * Called at close time when the filp is going away. | |
309 | * | |
310 | * Releases any remaining references on objects by this filp. | |
311 | */ | |
312 | void | |
313 | drm_syncobj_release(struct drm_file *file_private) | |
314 | { | |
315 | idr_for_each(&file_private->syncobj_idr, | |
316 | &drm_syncobj_release_handle, file_private); | |
317 | idr_destroy(&file_private->syncobj_idr); | |
318 | } | |
319 | ||
320 | int | |
321 | drm_syncobj_create_ioctl(struct drm_device *dev, void *data, | |
322 | struct drm_file *file_private) | |
323 | { | |
324 | struct drm_syncobj_create *args = data; | |
325 | ||
326 | if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) | |
327 | return -ENODEV; | |
328 | ||
329 | /* no valid flags yet */ | |
330 | if (args->flags) | |
331 | return -EINVAL; | |
332 | ||
333 | return drm_syncobj_create(file_private, | |
334 | &args->handle); | |
335 | } | |
336 | ||
337 | int | |
338 | drm_syncobj_destroy_ioctl(struct drm_device *dev, void *data, | |
339 | struct drm_file *file_private) | |
340 | { | |
341 | struct drm_syncobj_destroy *args = data; | |
342 | ||
343 | if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) | |
344 | return -ENODEV; | |
345 | ||
346 | /* make sure padding is empty */ | |
347 | if (args->pad) | |
348 | return -EINVAL; | |
349 | return drm_syncobj_destroy(file_private, args->handle); | |
350 | } | |
351 | ||
352 | int | |
353 | drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data, | |
354 | struct drm_file *file_private) | |
355 | { | |
356 | struct drm_syncobj_handle *args = data; | |
357 | ||
358 | if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) | |
359 | return -ENODEV; | |
360 | ||
361 | if (args->pad || args->flags) | |
362 | return -EINVAL; | |
363 | ||
364 | return drm_syncobj_handle_to_fd(file_private, args->handle, | |
365 | &args->fd); | |
366 | } | |
367 | ||
368 | int | |
369 | drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data, | |
370 | struct drm_file *file_private) | |
371 | { | |
372 | struct drm_syncobj_handle *args = data; | |
373 | ||
374 | if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) | |
375 | return -ENODEV; | |
376 | ||
377 | if (args->pad || args->flags) | |
378 | return -EINVAL; | |
379 | ||
380 | return drm_syncobj_fd_to_handle(file_private, args->fd, | |
381 | &args->handle); | |
382 | } |