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1 | /* |
2 | * Copyright (C) 2014 Red Hat | |
3 | * Copyright (C) 2014 Intel Corp. | |
4 | * | |
5 | * Permission is hereby granted, free of charge, to any person obtaining a | |
6 | * copy of this software and associated documentation files (the "Software"), | |
7 | * to deal in the Software without restriction, including without limitation | |
8 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
9 | * and/or sell copies of the Software, and to permit persons to whom the | |
10 | * Software is furnished to do so, subject to the following conditions: | |
11 | * | |
12 | * The above copyright notice and this permission notice shall be included in | |
13 | * all copies or substantial portions of the 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
19 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
20 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
21 | * OTHER DEALINGS IN THE SOFTWARE. | |
22 | * | |
23 | * Authors: | |
24 | * Rob Clark <robdclark@gmail.com> | |
25 | * Daniel Vetter <daniel.vetter@ffwll.ch> | |
26 | */ | |
27 | ||
28 | ||
29 | #include <drm/drmP.h> | |
30 | #include <drm/drm_atomic.h> | |
31 | #include <drm/drm_plane_helper.h> | |
32 | ||
33 | static void kfree_state(struct drm_atomic_state *state) | |
34 | { | |
35 | kfree(state->connectors); | |
36 | kfree(state->connector_states); | |
37 | kfree(state->crtcs); | |
38 | kfree(state->crtc_states); | |
39 | kfree(state->planes); | |
40 | kfree(state->plane_states); | |
41 | kfree(state); | |
42 | } | |
43 | ||
44 | /** | |
45 | * drm_atomic_state_alloc - allocate atomic state | |
46 | * @dev: DRM device | |
47 | * | |
48 | * This allocates an empty atomic state to track updates. | |
49 | */ | |
50 | struct drm_atomic_state * | |
51 | drm_atomic_state_alloc(struct drm_device *dev) | |
52 | { | |
53 | struct drm_atomic_state *state; | |
54 | ||
55 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
56 | if (!state) | |
57 | return NULL; | |
58 | ||
59 | state->crtcs = kcalloc(dev->mode_config.num_crtc, | |
60 | sizeof(*state->crtcs), GFP_KERNEL); | |
61 | if (!state->crtcs) | |
62 | goto fail; | |
63 | state->crtc_states = kcalloc(dev->mode_config.num_crtc, | |
64 | sizeof(*state->crtc_states), GFP_KERNEL); | |
65 | if (!state->crtc_states) | |
66 | goto fail; | |
67 | state->planes = kcalloc(dev->mode_config.num_total_plane, | |
68 | sizeof(*state->planes), GFP_KERNEL); | |
69 | if (!state->planes) | |
70 | goto fail; | |
71 | state->plane_states = kcalloc(dev->mode_config.num_total_plane, | |
72 | sizeof(*state->plane_states), GFP_KERNEL); | |
73 | if (!state->plane_states) | |
74 | goto fail; | |
75 | state->connectors = kcalloc(dev->mode_config.num_connector, | |
76 | sizeof(*state->connectors), | |
77 | GFP_KERNEL); | |
78 | if (!state->connectors) | |
79 | goto fail; | |
80 | state->connector_states = kcalloc(dev->mode_config.num_connector, | |
81 | sizeof(*state->connector_states), | |
82 | GFP_KERNEL); | |
83 | if (!state->connector_states) | |
84 | goto fail; | |
85 | ||
86 | state->dev = dev; | |
87 | ||
88 | DRM_DEBUG_KMS("Allocate atomic state %p\n", state); | |
89 | ||
90 | return state; | |
91 | fail: | |
92 | kfree_state(state); | |
93 | ||
94 | return NULL; | |
95 | } | |
96 | EXPORT_SYMBOL(drm_atomic_state_alloc); | |
97 | ||
98 | /** | |
99 | * drm_atomic_state_clear - clear state object | |
100 | * @state: atomic state | |
101 | * | |
102 | * When the w/w mutex algorithm detects a deadlock we need to back off and drop | |
103 | * all locks. So someone else could sneak in and change the current modeset | |
104 | * configuration. Which means that all the state assembled in @state is no | |
105 | * longer an atomic update to the current state, but to some arbitrary earlier | |
106 | * state. Which could break assumptions the driver's ->atomic_check likely | |
107 | * relies on. | |
108 | * | |
109 | * Hence we must clear all cached state and completely start over, using this | |
110 | * function. | |
111 | */ | |
112 | void drm_atomic_state_clear(struct drm_atomic_state *state) | |
113 | { | |
114 | struct drm_device *dev = state->dev; | |
115 | int i; | |
116 | ||
117 | DRM_DEBUG_KMS("Clearing atomic state %p\n", state); | |
118 | ||
119 | for (i = 0; i < dev->mode_config.num_connector; i++) { | |
120 | struct drm_connector *connector = state->connectors[i]; | |
121 | ||
122 | if (!connector) | |
123 | continue; | |
124 | ||
125 | connector->funcs->atomic_destroy_state(connector, | |
126 | state->connector_states[i]); | |
127 | } | |
128 | ||
129 | for (i = 0; i < dev->mode_config.num_crtc; i++) { | |
130 | struct drm_crtc *crtc = state->crtcs[i]; | |
131 | ||
132 | if (!crtc) | |
133 | continue; | |
134 | ||
135 | crtc->funcs->atomic_destroy_state(crtc, | |
136 | state->crtc_states[i]); | |
137 | } | |
138 | ||
139 | for (i = 0; i < dev->mode_config.num_total_plane; i++) { | |
140 | struct drm_plane *plane = state->planes[i]; | |
141 | ||
142 | if (!plane) | |
143 | continue; | |
144 | ||
145 | plane->funcs->atomic_destroy_state(plane, | |
146 | state->plane_states[i]); | |
147 | } | |
148 | } | |
149 | EXPORT_SYMBOL(drm_atomic_state_clear); | |
150 | ||
151 | /** | |
152 | * drm_atomic_state_free - free all memory for an atomic state | |
153 | * @state: atomic state to deallocate | |
154 | * | |
155 | * This frees all memory associated with an atomic state, including all the | |
156 | * per-object state for planes, crtcs and connectors. | |
157 | */ | |
158 | void drm_atomic_state_free(struct drm_atomic_state *state) | |
159 | { | |
160 | drm_atomic_state_clear(state); | |
161 | ||
162 | DRM_DEBUG_KMS("Freeing atomic state %p\n", state); | |
163 | ||
164 | kfree_state(state); | |
165 | } | |
166 | EXPORT_SYMBOL(drm_atomic_state_free); | |
167 | ||
168 | /** | |
169 | * drm_atomic_get_crtc_state - get crtc state | |
170 | * @state: global atomic state object | |
171 | * @crtc: crtc to get state object for | |
172 | * | |
173 | * This function returns the crtc state for the given crtc, allocating it if | |
174 | * needed. It will also grab the relevant crtc lock to make sure that the state | |
175 | * is consistent. | |
176 | * | |
177 | * Returns: | |
178 | * | |
179 | * Either the allocated state or the error code encoded into the pointer. When | |
180 | * the error is EDEADLK then the w/w mutex code has detected a deadlock and the | |
181 | * entire atomic sequence must be restarted. All other errors are fatal. | |
182 | */ | |
183 | struct drm_crtc_state * | |
184 | drm_atomic_get_crtc_state(struct drm_atomic_state *state, | |
185 | struct drm_crtc *crtc) | |
186 | { | |
187 | int ret, index; | |
188 | struct drm_crtc_state *crtc_state; | |
189 | ||
190 | index = drm_crtc_index(crtc); | |
191 | ||
192 | if (state->crtc_states[index]) | |
193 | return state->crtc_states[index]; | |
194 | ||
195 | ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx); | |
196 | if (ret) | |
197 | return ERR_PTR(ret); | |
198 | ||
199 | crtc_state = crtc->funcs->atomic_duplicate_state(crtc); | |
200 | if (!crtc_state) | |
201 | return ERR_PTR(-ENOMEM); | |
202 | ||
203 | state->crtc_states[index] = crtc_state; | |
204 | state->crtcs[index] = crtc; | |
205 | crtc_state->state = state; | |
206 | ||
207 | DRM_DEBUG_KMS("Added [CRTC:%d] %p state to %p\n", | |
208 | crtc->base.id, crtc_state, state); | |
209 | ||
210 | return crtc_state; | |
211 | } | |
212 | EXPORT_SYMBOL(drm_atomic_get_crtc_state); | |
213 | ||
214 | /** | |
215 | * drm_atomic_get_plane_state - get plane state | |
216 | * @state: global atomic state object | |
217 | * @plane: plane to get state object for | |
218 | * | |
219 | * This function returns the plane state for the given plane, allocating it if | |
220 | * needed. It will also grab the relevant plane lock to make sure that the state | |
221 | * is consistent. | |
222 | * | |
223 | * Returns: | |
224 | * | |
225 | * Either the allocated state or the error code encoded into the pointer. When | |
226 | * the error is EDEADLK then the w/w mutex code has detected a deadlock and the | |
227 | * entire atomic sequence must be restarted. All other errors are fatal. | |
228 | */ | |
229 | struct drm_plane_state * | |
230 | drm_atomic_get_plane_state(struct drm_atomic_state *state, | |
231 | struct drm_plane *plane) | |
232 | { | |
233 | int ret, index; | |
234 | struct drm_plane_state *plane_state; | |
235 | ||
236 | index = drm_plane_index(plane); | |
237 | ||
238 | if (state->plane_states[index]) | |
239 | return state->plane_states[index]; | |
240 | ||
241 | /* | |
242 | * TODO: We currently don't have per-plane mutexes. So instead of trying | |
243 | * crazy tricks with deferring plane->crtc and hoping for the best just | |
244 | * grab all crtc locks. Once we have per-plane locks we must update this | |
245 | * to only take the plane mutex. | |
246 | */ | |
247 | ret = drm_modeset_lock_all_crtcs(state->dev, state->acquire_ctx); | |
248 | if (ret) | |
249 | return ERR_PTR(ret); | |
250 | ||
251 | plane_state = plane->funcs->atomic_duplicate_state(plane); | |
252 | if (!plane_state) | |
253 | return ERR_PTR(-ENOMEM); | |
254 | ||
255 | state->plane_states[index] = plane_state; | |
256 | state->planes[index] = plane; | |
257 | plane_state->state = state; | |
258 | ||
259 | DRM_DEBUG_KMS("Added [PLANE:%d] %p state to %p\n", | |
260 | plane->base.id, plane_state, state); | |
261 | ||
262 | if (plane_state->crtc) { | |
263 | struct drm_crtc_state *crtc_state; | |
264 | ||
265 | crtc_state = drm_atomic_get_crtc_state(state, | |
266 | plane_state->crtc); | |
267 | if (IS_ERR(crtc_state)) | |
268 | return ERR_CAST(crtc_state); | |
269 | } | |
270 | ||
271 | return plane_state; | |
272 | } | |
273 | EXPORT_SYMBOL(drm_atomic_get_plane_state); | |
274 | ||
275 | /** | |
276 | * drm_atomic_get_connector_state - get connector state | |
277 | * @state: global atomic state object | |
278 | * @connector: connector to get state object for | |
279 | * | |
280 | * This function returns the connector state for the given connector, | |
281 | * allocating it if needed. It will also grab the relevant connector lock to | |
282 | * make sure that the state is consistent. | |
283 | * | |
284 | * Returns: | |
285 | * | |
286 | * Either the allocated state or the error code encoded into the pointer. When | |
287 | * the error is EDEADLK then the w/w mutex code has detected a deadlock and the | |
288 | * entire atomic sequence must be restarted. All other errors are fatal. | |
289 | */ | |
290 | struct drm_connector_state * | |
291 | drm_atomic_get_connector_state(struct drm_atomic_state *state, | |
292 | struct drm_connector *connector) | |
293 | { | |
294 | int ret, index; | |
295 | struct drm_mode_config *config = &connector->dev->mode_config; | |
296 | struct drm_connector_state *connector_state; | |
297 | ||
298 | index = drm_connector_index(connector); | |
299 | ||
300 | if (state->connector_states[index]) | |
301 | return state->connector_states[index]; | |
302 | ||
303 | ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx); | |
304 | if (ret) | |
305 | return ERR_PTR(ret); | |
306 | ||
307 | connector_state = connector->funcs->atomic_duplicate_state(connector); | |
308 | if (!connector_state) | |
309 | return ERR_PTR(-ENOMEM); | |
310 | ||
311 | state->connector_states[index] = connector_state; | |
312 | state->connectors[index] = connector; | |
313 | connector_state->state = state; | |
314 | ||
315 | DRM_DEBUG_KMS("Added [CONNECTOR:%d] %p state to %p\n", | |
316 | connector->base.id, connector_state, state); | |
317 | ||
318 | if (connector_state->crtc) { | |
319 | struct drm_crtc_state *crtc_state; | |
320 | ||
321 | crtc_state = drm_atomic_get_crtc_state(state, | |
322 | connector_state->crtc); | |
323 | if (IS_ERR(crtc_state)) | |
324 | return ERR_CAST(crtc_state); | |
325 | } | |
326 | ||
327 | return connector_state; | |
328 | } | |
329 | EXPORT_SYMBOL(drm_atomic_get_connector_state); | |
330 | ||
331 | /** | |
332 | * drm_atomic_set_crtc_for_plane - set crtc for plane | |
333 | * @plane_state: atomic state object for the plane | |
334 | * @crtc: crtc to use for the plane | |
335 | * | |
336 | * Changing the assigned crtc for a plane requires us to grab the lock and state | |
337 | * for the new crtc, as needed. This function takes care of all these details | |
338 | * besides updating the pointer in the state object itself. | |
339 | * | |
340 | * Returns: | |
341 | * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK | |
342 | * then the w/w mutex code has detected a deadlock and the entire atomic | |
343 | * sequence must be restarted. All other errors are fatal. | |
344 | */ | |
345 | int | |
346 | drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state, | |
347 | struct drm_crtc *crtc) | |
348 | { | |
349 | struct drm_crtc_state *crtc_state; | |
350 | ||
351 | if (crtc) { | |
352 | crtc_state = drm_atomic_get_crtc_state(plane_state->state, | |
353 | crtc); | |
354 | if (IS_ERR(crtc_state)) | |
355 | return PTR_ERR(crtc_state); | |
356 | } | |
357 | ||
358 | plane_state->crtc = crtc; | |
359 | ||
360 | if (crtc) | |
361 | DRM_DEBUG_KMS("Link plane state %p to [CRTC:%d]\n", | |
362 | plane_state, crtc->base.id); | |
363 | else | |
364 | DRM_DEBUG_KMS("Link plane state %p to [NOCRTC]\n", plane_state); | |
365 | ||
366 | return 0; | |
367 | } | |
368 | EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane); | |
369 | ||
370 | /** | |
371 | * drm_atomic_set_crtc_for_connector - set crtc for connector | |
372 | * @conn_state: atomic state object for the connector | |
373 | * @crtc: crtc to use for the connector | |
374 | * | |
375 | * Changing the assigned crtc for a connector requires us to grab the lock and | |
376 | * state for the new crtc, as needed. This function takes care of all these | |
377 | * details besides updating the pointer in the state object itself. | |
378 | * | |
379 | * Returns: | |
380 | * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK | |
381 | * then the w/w mutex code has detected a deadlock and the entire atomic | |
382 | * sequence must be restarted. All other errors are fatal. | |
383 | */ | |
384 | int | |
385 | drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state, | |
386 | struct drm_crtc *crtc) | |
387 | { | |
388 | struct drm_crtc_state *crtc_state; | |
389 | ||
390 | if (crtc) { | |
391 | crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc); | |
392 | if (IS_ERR(crtc_state)) | |
393 | return PTR_ERR(crtc_state); | |
394 | } | |
395 | ||
396 | conn_state->crtc = crtc; | |
397 | ||
398 | if (crtc) | |
399 | DRM_DEBUG_KMS("Link connector state %p to [CRTC:%d]\n", | |
400 | conn_state, crtc->base.id); | |
401 | else | |
402 | DRM_DEBUG_KMS("Link connector state %p to [NOCRTC]\n", | |
403 | conn_state); | |
404 | ||
405 | return 0; | |
406 | } | |
407 | EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector); | |
408 | ||
409 | /** | |
410 | * drm_atomic_add_affected_connectors - add connectors for crtc | |
411 | * @state: atomic state | |
412 | * @crtc: DRM crtc | |
413 | * | |
414 | * This function walks the current configuration and adds all connectors | |
415 | * currently using @crtc to the atomic configuration @state. Note that this | |
416 | * function must acquire the connection mutex. This can potentially cause | |
417 | * unneeded seralization if the update is just for the planes on one crtc. Hence | |
418 | * drivers and helpers should only call this when really needed (e.g. when a | |
419 | * full modeset needs to happen due to some change). | |
420 | * | |
421 | * Returns: | |
422 | * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK | |
423 | * then the w/w mutex code has detected a deadlock and the entire atomic | |
424 | * sequence must be restarted. All other errors are fatal. | |
425 | */ | |
426 | int | |
427 | drm_atomic_add_affected_connectors(struct drm_atomic_state *state, | |
428 | struct drm_crtc *crtc) | |
429 | { | |
430 | struct drm_mode_config *config = &state->dev->mode_config; | |
431 | struct drm_connector *connector; | |
432 | struct drm_connector_state *conn_state; | |
433 | int ret; | |
434 | ||
435 | ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx); | |
436 | if (ret) | |
437 | return ret; | |
438 | ||
439 | DRM_DEBUG_KMS("Adding all current connectors for [CRTC:%d] to %p\n", | |
440 | crtc->base.id, state); | |
441 | ||
442 | /* | |
443 | * Changed connectors are already in @state, so only need to look at the | |
444 | * current configuration. | |
445 | */ | |
446 | list_for_each_entry(connector, &config->connector_list, head) { | |
447 | if (connector->state->crtc != crtc) | |
448 | continue; | |
449 | ||
450 | conn_state = drm_atomic_get_connector_state(state, connector); | |
451 | if (IS_ERR(conn_state)) | |
452 | return PTR_ERR(conn_state); | |
453 | } | |
454 | ||
455 | return 0; | |
456 | } | |
457 | EXPORT_SYMBOL(drm_atomic_add_affected_connectors); | |
458 | ||
459 | /** | |
460 | * drm_atomic_connectors_for_crtc - count number of connected outputs | |
461 | * @state: atomic state | |
462 | * @crtc: DRM crtc | |
463 | * | |
464 | * This function counts all connectors which will be connected to @crtc | |
465 | * according to @state. Useful to recompute the enable state for @crtc. | |
466 | */ | |
467 | int | |
468 | drm_atomic_connectors_for_crtc(struct drm_atomic_state *state, | |
469 | struct drm_crtc *crtc) | |
470 | { | |
471 | int nconnectors = state->dev->mode_config.num_connector; | |
472 | int i, num_connected_connectors = 0; | |
473 | ||
474 | for (i = 0; i < nconnectors; i++) { | |
475 | struct drm_connector_state *conn_state; | |
476 | ||
477 | conn_state = state->connector_states[i]; | |
478 | ||
479 | if (conn_state && conn_state->crtc == crtc) | |
480 | num_connected_connectors++; | |
481 | } | |
482 | ||
483 | DRM_DEBUG_KMS("State %p has %i connectors for [CRTC:%d]\n", | |
484 | state, num_connected_connectors, crtc->base.id); | |
485 | ||
486 | return num_connected_connectors; | |
487 | } | |
488 | EXPORT_SYMBOL(drm_atomic_connectors_for_crtc); | |
489 | ||
490 | /** | |
491 | * drm_atomic_legacy_backoff - locking backoff for legacy ioctls | |
492 | * @state: atomic state | |
493 | * | |
494 | * This function should be used by legacy entry points which don't understand | |
495 | * -EDEADLK semantics. For simplicity this one will grab all modeset locks after | |
496 | * the slowpath completed. | |
497 | */ | |
498 | void drm_atomic_legacy_backoff(struct drm_atomic_state *state) | |
499 | { | |
500 | int ret; | |
501 | ||
502 | retry: | |
503 | drm_modeset_backoff(state->acquire_ctx); | |
504 | ||
505 | ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex, | |
506 | state->acquire_ctx); | |
507 | if (ret) | |
508 | goto retry; | |
509 | ret = drm_modeset_lock_all_crtcs(state->dev, | |
510 | state->acquire_ctx); | |
511 | if (ret) | |
512 | goto retry; | |
513 | } | |
514 | EXPORT_SYMBOL(drm_atomic_legacy_backoff); | |
515 | ||
516 | /** | |
517 | * drm_atomic_check_only - check whether a given config would work | |
518 | * @state: atomic configuration to check | |
519 | * | |
520 | * Note that this function can return -EDEADLK if the driver needed to acquire | |
521 | * more locks but encountered a deadlock. The caller must then do the usual w/w | |
522 | * backoff dance and restart. All other errors are fatal. | |
523 | * | |
524 | * Returns: | |
525 | * 0 on success, negative error code on failure. | |
526 | */ | |
527 | int drm_atomic_check_only(struct drm_atomic_state *state) | |
528 | { | |
529 | struct drm_mode_config *config = &state->dev->mode_config; | |
530 | ||
531 | DRM_DEBUG_KMS("checking %p\n", state); | |
532 | ||
533 | if (config->funcs->atomic_check) | |
534 | return config->funcs->atomic_check(state->dev, state); | |
535 | else | |
536 | return 0; | |
537 | } | |
538 | EXPORT_SYMBOL(drm_atomic_check_only); | |
539 | ||
540 | /** | |
541 | * drm_atomic_commit - commit configuration atomically | |
542 | * @state: atomic configuration to check | |
543 | * | |
544 | * Note that this function can return -EDEADLK if the driver needed to acquire | |
545 | * more locks but encountered a deadlock. The caller must then do the usual w/w | |
546 | * backoff dance and restart. All other errors are fatal. | |
547 | * | |
548 | * Also note that on successful execution ownership of @state is transferred | |
549 | * from the caller of this function to the function itself. The caller must not | |
550 | * free or in any other way access @state. If the function fails then the caller | |
551 | * must clean up @state itself. | |
552 | * | |
553 | * Returns: | |
554 | * 0 on success, negative error code on failure. | |
555 | */ | |
556 | int drm_atomic_commit(struct drm_atomic_state *state) | |
557 | { | |
558 | struct drm_mode_config *config = &state->dev->mode_config; | |
559 | int ret; | |
560 | ||
561 | ret = drm_atomic_check_only(state); | |
562 | if (ret) | |
563 | return ret; | |
564 | ||
565 | DRM_DEBUG_KMS("commiting %p\n", state); | |
566 | ||
567 | return config->funcs->atomic_commit(state->dev, state, false); | |
568 | } | |
569 | EXPORT_SYMBOL(drm_atomic_commit); | |
570 | ||
571 | /** | |
572 | * drm_atomic_async_commit - atomic&async configuration commit | |
573 | * @state: atomic configuration to check | |
574 | * | |
575 | * Note that this function can return -EDEADLK if the driver needed to acquire | |
576 | * more locks but encountered a deadlock. The caller must then do the usual w/w | |
577 | * backoff dance and restart. All other errors are fatal. | |
578 | * | |
579 | * Also note that on successful execution ownership of @state is transferred | |
580 | * from the caller of this function to the function itself. The caller must not | |
581 | * free or in any other way access @state. If the function fails then the caller | |
582 | * must clean up @state itself. | |
583 | * | |
584 | * Returns: | |
585 | * 0 on success, negative error code on failure. | |
586 | */ | |
587 | int drm_atomic_async_commit(struct drm_atomic_state *state) | |
588 | { | |
589 | struct drm_mode_config *config = &state->dev->mode_config; | |
590 | int ret; | |
591 | ||
592 | ret = drm_atomic_check_only(state); | |
593 | if (ret) | |
594 | return ret; | |
595 | ||
596 | DRM_DEBUG_KMS("commiting %p asynchronously\n", state); | |
597 | ||
598 | return config->funcs->atomic_commit(state->dev, state, true); | |
599 | } | |
600 | EXPORT_SYMBOL(drm_atomic_async_commit); |