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cc4ceb48 DV |
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 | ||
f52b69f1 DV |
59 | state->num_connector = ACCESS_ONCE(dev->mode_config.num_connector); |
60 | ||
cc4ceb48 DV |
61 | state->crtcs = kcalloc(dev->mode_config.num_crtc, |
62 | sizeof(*state->crtcs), GFP_KERNEL); | |
63 | if (!state->crtcs) | |
64 | goto fail; | |
65 | state->crtc_states = kcalloc(dev->mode_config.num_crtc, | |
66 | sizeof(*state->crtc_states), GFP_KERNEL); | |
67 | if (!state->crtc_states) | |
68 | goto fail; | |
69 | state->planes = kcalloc(dev->mode_config.num_total_plane, | |
70 | sizeof(*state->planes), GFP_KERNEL); | |
71 | if (!state->planes) | |
72 | goto fail; | |
73 | state->plane_states = kcalloc(dev->mode_config.num_total_plane, | |
74 | sizeof(*state->plane_states), GFP_KERNEL); | |
75 | if (!state->plane_states) | |
76 | goto fail; | |
f52b69f1 | 77 | state->connectors = kcalloc(state->num_connector, |
cc4ceb48 DV |
78 | sizeof(*state->connectors), |
79 | GFP_KERNEL); | |
80 | if (!state->connectors) | |
81 | goto fail; | |
f52b69f1 | 82 | state->connector_states = kcalloc(state->num_connector, |
cc4ceb48 DV |
83 | sizeof(*state->connector_states), |
84 | GFP_KERNEL); | |
85 | if (!state->connector_states) | |
86 | goto fail; | |
87 | ||
88 | state->dev = dev; | |
89 | ||
90 | DRM_DEBUG_KMS("Allocate atomic state %p\n", state); | |
91 | ||
92 | return state; | |
93 | fail: | |
94 | kfree_state(state); | |
95 | ||
96 | return NULL; | |
97 | } | |
98 | EXPORT_SYMBOL(drm_atomic_state_alloc); | |
99 | ||
100 | /** | |
101 | * drm_atomic_state_clear - clear state object | |
102 | * @state: atomic state | |
103 | * | |
104 | * When the w/w mutex algorithm detects a deadlock we need to back off and drop | |
105 | * all locks. So someone else could sneak in and change the current modeset | |
106 | * configuration. Which means that all the state assembled in @state is no | |
107 | * longer an atomic update to the current state, but to some arbitrary earlier | |
108 | * state. Which could break assumptions the driver's ->atomic_check likely | |
109 | * relies on. | |
110 | * | |
111 | * Hence we must clear all cached state and completely start over, using this | |
112 | * function. | |
113 | */ | |
114 | void drm_atomic_state_clear(struct drm_atomic_state *state) | |
115 | { | |
116 | struct drm_device *dev = state->dev; | |
6f75cea6 | 117 | struct drm_mode_config *config = &dev->mode_config; |
cc4ceb48 DV |
118 | int i; |
119 | ||
120 | DRM_DEBUG_KMS("Clearing atomic state %p\n", state); | |
121 | ||
f52b69f1 | 122 | for (i = 0; i < state->num_connector; i++) { |
cc4ceb48 DV |
123 | struct drm_connector *connector = state->connectors[i]; |
124 | ||
125 | if (!connector) | |
126 | continue; | |
127 | ||
6f75cea6 DV |
128 | WARN_ON(!drm_modeset_is_locked(&config->connection_mutex)); |
129 | ||
cc4ceb48 DV |
130 | connector->funcs->atomic_destroy_state(connector, |
131 | state->connector_states[i]); | |
132 | } | |
133 | ||
6f75cea6 | 134 | for (i = 0; i < config->num_crtc; i++) { |
cc4ceb48 DV |
135 | struct drm_crtc *crtc = state->crtcs[i]; |
136 | ||
137 | if (!crtc) | |
138 | continue; | |
139 | ||
140 | crtc->funcs->atomic_destroy_state(crtc, | |
141 | state->crtc_states[i]); | |
142 | } | |
143 | ||
6f75cea6 | 144 | for (i = 0; i < config->num_total_plane; i++) { |
cc4ceb48 DV |
145 | struct drm_plane *plane = state->planes[i]; |
146 | ||
147 | if (!plane) | |
148 | continue; | |
149 | ||
150 | plane->funcs->atomic_destroy_state(plane, | |
151 | state->plane_states[i]); | |
152 | } | |
153 | } | |
154 | EXPORT_SYMBOL(drm_atomic_state_clear); | |
155 | ||
156 | /** | |
157 | * drm_atomic_state_free - free all memory for an atomic state | |
158 | * @state: atomic state to deallocate | |
159 | * | |
160 | * This frees all memory associated with an atomic state, including all the | |
161 | * per-object state for planes, crtcs and connectors. | |
162 | */ | |
163 | void drm_atomic_state_free(struct drm_atomic_state *state) | |
164 | { | |
165 | drm_atomic_state_clear(state); | |
166 | ||
167 | DRM_DEBUG_KMS("Freeing atomic state %p\n", state); | |
168 | ||
169 | kfree_state(state); | |
170 | } | |
171 | EXPORT_SYMBOL(drm_atomic_state_free); | |
172 | ||
173 | /** | |
174 | * drm_atomic_get_crtc_state - get crtc state | |
175 | * @state: global atomic state object | |
176 | * @crtc: crtc to get state object for | |
177 | * | |
178 | * This function returns the crtc state for the given crtc, allocating it if | |
179 | * needed. It will also grab the relevant crtc lock to make sure that the state | |
180 | * is consistent. | |
181 | * | |
182 | * Returns: | |
183 | * | |
184 | * Either the allocated state or the error code encoded into the pointer. When | |
185 | * the error is EDEADLK then the w/w mutex code has detected a deadlock and the | |
186 | * entire atomic sequence must be restarted. All other errors are fatal. | |
187 | */ | |
188 | struct drm_crtc_state * | |
189 | drm_atomic_get_crtc_state(struct drm_atomic_state *state, | |
190 | struct drm_crtc *crtc) | |
191 | { | |
192 | int ret, index; | |
193 | struct drm_crtc_state *crtc_state; | |
194 | ||
195 | index = drm_crtc_index(crtc); | |
196 | ||
197 | if (state->crtc_states[index]) | |
198 | return state->crtc_states[index]; | |
199 | ||
200 | ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx); | |
201 | if (ret) | |
202 | return ERR_PTR(ret); | |
203 | ||
204 | crtc_state = crtc->funcs->atomic_duplicate_state(crtc); | |
205 | if (!crtc_state) | |
206 | return ERR_PTR(-ENOMEM); | |
207 | ||
208 | state->crtc_states[index] = crtc_state; | |
209 | state->crtcs[index] = crtc; | |
210 | crtc_state->state = state; | |
211 | ||
212 | DRM_DEBUG_KMS("Added [CRTC:%d] %p state to %p\n", | |
213 | crtc->base.id, crtc_state, state); | |
214 | ||
215 | return crtc_state; | |
216 | } | |
217 | EXPORT_SYMBOL(drm_atomic_get_crtc_state); | |
218 | ||
219 | /** | |
220 | * drm_atomic_get_plane_state - get plane state | |
221 | * @state: global atomic state object | |
222 | * @plane: plane to get state object for | |
223 | * | |
224 | * This function returns the plane state for the given plane, allocating it if | |
225 | * needed. It will also grab the relevant plane lock to make sure that the state | |
226 | * is consistent. | |
227 | * | |
228 | * Returns: | |
229 | * | |
230 | * Either the allocated state or the error code encoded into the pointer. When | |
231 | * the error is EDEADLK then the w/w mutex code has detected a deadlock and the | |
232 | * entire atomic sequence must be restarted. All other errors are fatal. | |
233 | */ | |
234 | struct drm_plane_state * | |
235 | drm_atomic_get_plane_state(struct drm_atomic_state *state, | |
236 | struct drm_plane *plane) | |
237 | { | |
238 | int ret, index; | |
239 | struct drm_plane_state *plane_state; | |
240 | ||
241 | index = drm_plane_index(plane); | |
242 | ||
243 | if (state->plane_states[index]) | |
244 | return state->plane_states[index]; | |
245 | ||
4d02e2de | 246 | ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx); |
cc4ceb48 DV |
247 | if (ret) |
248 | return ERR_PTR(ret); | |
249 | ||
250 | plane_state = plane->funcs->atomic_duplicate_state(plane); | |
251 | if (!plane_state) | |
252 | return ERR_PTR(-ENOMEM); | |
253 | ||
254 | state->plane_states[index] = plane_state; | |
255 | state->planes[index] = plane; | |
256 | plane_state->state = state; | |
257 | ||
258 | DRM_DEBUG_KMS("Added [PLANE:%d] %p state to %p\n", | |
259 | plane->base.id, plane_state, state); | |
260 | ||
261 | if (plane_state->crtc) { | |
262 | struct drm_crtc_state *crtc_state; | |
263 | ||
264 | crtc_state = drm_atomic_get_crtc_state(state, | |
265 | plane_state->crtc); | |
266 | if (IS_ERR(crtc_state)) | |
267 | return ERR_CAST(crtc_state); | |
268 | } | |
269 | ||
270 | return plane_state; | |
271 | } | |
272 | EXPORT_SYMBOL(drm_atomic_get_plane_state); | |
273 | ||
274 | /** | |
275 | * drm_atomic_get_connector_state - get connector state | |
276 | * @state: global atomic state object | |
277 | * @connector: connector to get state object for | |
278 | * | |
279 | * This function returns the connector state for the given connector, | |
280 | * allocating it if needed. It will also grab the relevant connector lock to | |
281 | * make sure that the state is consistent. | |
282 | * | |
283 | * Returns: | |
284 | * | |
285 | * Either the allocated state or the error code encoded into the pointer. When | |
286 | * the error is EDEADLK then the w/w mutex code has detected a deadlock and the | |
287 | * entire atomic sequence must be restarted. All other errors are fatal. | |
288 | */ | |
289 | struct drm_connector_state * | |
290 | drm_atomic_get_connector_state(struct drm_atomic_state *state, | |
291 | struct drm_connector *connector) | |
292 | { | |
293 | int ret, index; | |
294 | struct drm_mode_config *config = &connector->dev->mode_config; | |
295 | struct drm_connector_state *connector_state; | |
296 | ||
c7eb76f4 DV |
297 | ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx); |
298 | if (ret) | |
299 | return ERR_PTR(ret); | |
300 | ||
cc4ceb48 DV |
301 | index = drm_connector_index(connector); |
302 | ||
f52b69f1 DV |
303 | /* |
304 | * Construction of atomic state updates can race with a connector | |
305 | * hot-add which might overflow. In this case flip the table and just | |
306 | * restart the entire ioctl - no one is fast enough to livelock a cpu | |
307 | * with physical hotplug events anyway. | |
308 | * | |
309 | * Note that we only grab the indexes once we have the right lock to | |
310 | * prevent hotplug/unplugging of connectors. So removal is no problem, | |
311 | * at most the array is a bit too large. | |
312 | */ | |
313 | if (index >= state->num_connector) { | |
314 | DRM_DEBUG_KMS("Hot-added connector would overflow state array, restarting\n"); | |
fc2d2bc1 | 315 | return ERR_PTR(-EAGAIN); |
f52b69f1 DV |
316 | } |
317 | ||
cc4ceb48 DV |
318 | if (state->connector_states[index]) |
319 | return state->connector_states[index]; | |
320 | ||
cc4ceb48 DV |
321 | connector_state = connector->funcs->atomic_duplicate_state(connector); |
322 | if (!connector_state) | |
323 | return ERR_PTR(-ENOMEM); | |
324 | ||
325 | state->connector_states[index] = connector_state; | |
326 | state->connectors[index] = connector; | |
327 | connector_state->state = state; | |
328 | ||
329 | DRM_DEBUG_KMS("Added [CONNECTOR:%d] %p state to %p\n", | |
330 | connector->base.id, connector_state, state); | |
331 | ||
332 | if (connector_state->crtc) { | |
333 | struct drm_crtc_state *crtc_state; | |
334 | ||
335 | crtc_state = drm_atomic_get_crtc_state(state, | |
336 | connector_state->crtc); | |
337 | if (IS_ERR(crtc_state)) | |
338 | return ERR_CAST(crtc_state); | |
339 | } | |
340 | ||
341 | return connector_state; | |
342 | } | |
343 | EXPORT_SYMBOL(drm_atomic_get_connector_state); | |
344 | ||
345 | /** | |
346 | * drm_atomic_set_crtc_for_plane - set crtc for plane | |
07cc0ef6 | 347 | * @plane_state: the plane whose incoming state to update |
cc4ceb48 DV |
348 | * @crtc: crtc to use for the plane |
349 | * | |
350 | * Changing the assigned crtc for a plane requires us to grab the lock and state | |
351 | * for the new crtc, as needed. This function takes care of all these details | |
352 | * besides updating the pointer in the state object itself. | |
353 | * | |
354 | * Returns: | |
355 | * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK | |
356 | * then the w/w mutex code has detected a deadlock and the entire atomic | |
357 | * sequence must be restarted. All other errors are fatal. | |
358 | */ | |
359 | int | |
07cc0ef6 DV |
360 | drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state, |
361 | struct drm_crtc *crtc) | |
cc4ceb48 | 362 | { |
07cc0ef6 | 363 | struct drm_plane *plane = plane_state->plane; |
cc4ceb48 DV |
364 | struct drm_crtc_state *crtc_state; |
365 | ||
6ddd388a RC |
366 | if (plane_state->crtc) { |
367 | crtc_state = drm_atomic_get_crtc_state(plane_state->state, | |
368 | plane_state->crtc); | |
369 | if (WARN_ON(IS_ERR(crtc_state))) | |
370 | return PTR_ERR(crtc_state); | |
371 | ||
372 | crtc_state->plane_mask &= ~(1 << drm_plane_index(plane)); | |
373 | } | |
374 | ||
375 | plane_state->crtc = crtc; | |
376 | ||
cc4ceb48 DV |
377 | if (crtc) { |
378 | crtc_state = drm_atomic_get_crtc_state(plane_state->state, | |
379 | crtc); | |
380 | if (IS_ERR(crtc_state)) | |
381 | return PTR_ERR(crtc_state); | |
6ddd388a | 382 | crtc_state->plane_mask |= (1 << drm_plane_index(plane)); |
cc4ceb48 DV |
383 | } |
384 | ||
cc4ceb48 DV |
385 | if (crtc) |
386 | DRM_DEBUG_KMS("Link plane state %p to [CRTC:%d]\n", | |
387 | plane_state, crtc->base.id); | |
388 | else | |
389 | DRM_DEBUG_KMS("Link plane state %p to [NOCRTC]\n", plane_state); | |
390 | ||
391 | return 0; | |
392 | } | |
393 | EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane); | |
394 | ||
321ebf04 DV |
395 | /** |
396 | * drm_atomic_set_fb_for_plane - set crtc for plane | |
397 | * @plane_state: atomic state object for the plane | |
398 | * @fb: fb to use for the plane | |
399 | * | |
400 | * Changing the assigned framebuffer for a plane requires us to grab a reference | |
401 | * to the new fb and drop the reference to the old fb, if there is one. This | |
402 | * function takes care of all these details besides updating the pointer in the | |
403 | * state object itself. | |
404 | */ | |
405 | void | |
406 | drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state, | |
407 | struct drm_framebuffer *fb) | |
408 | { | |
409 | if (plane_state->fb) | |
410 | drm_framebuffer_unreference(plane_state->fb); | |
411 | if (fb) | |
412 | drm_framebuffer_reference(fb); | |
413 | plane_state->fb = fb; | |
414 | ||
415 | if (fb) | |
416 | DRM_DEBUG_KMS("Set [FB:%d] for plane state %p\n", | |
417 | fb->base.id, plane_state); | |
418 | else | |
419 | DRM_DEBUG_KMS("Set [NOFB] for plane state %p\n", plane_state); | |
420 | } | |
421 | EXPORT_SYMBOL(drm_atomic_set_fb_for_plane); | |
422 | ||
cc4ceb48 DV |
423 | /** |
424 | * drm_atomic_set_crtc_for_connector - set crtc for connector | |
425 | * @conn_state: atomic state object for the connector | |
426 | * @crtc: crtc to use for the connector | |
427 | * | |
428 | * Changing the assigned crtc for a connector requires us to grab the lock and | |
429 | * state for the new crtc, as needed. This function takes care of all these | |
430 | * details besides updating the pointer in the state object itself. | |
431 | * | |
432 | * Returns: | |
433 | * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK | |
434 | * then the w/w mutex code has detected a deadlock and the entire atomic | |
435 | * sequence must be restarted. All other errors are fatal. | |
436 | */ | |
437 | int | |
438 | drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state, | |
439 | struct drm_crtc *crtc) | |
440 | { | |
441 | struct drm_crtc_state *crtc_state; | |
442 | ||
443 | if (crtc) { | |
444 | crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc); | |
445 | if (IS_ERR(crtc_state)) | |
446 | return PTR_ERR(crtc_state); | |
447 | } | |
448 | ||
449 | conn_state->crtc = crtc; | |
450 | ||
451 | if (crtc) | |
452 | DRM_DEBUG_KMS("Link connector state %p to [CRTC:%d]\n", | |
453 | conn_state, crtc->base.id); | |
454 | else | |
455 | DRM_DEBUG_KMS("Link connector state %p to [NOCRTC]\n", | |
456 | conn_state); | |
457 | ||
458 | return 0; | |
459 | } | |
460 | EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector); | |
461 | ||
462 | /** | |
463 | * drm_atomic_add_affected_connectors - add connectors for crtc | |
464 | * @state: atomic state | |
465 | * @crtc: DRM crtc | |
466 | * | |
467 | * This function walks the current configuration and adds all connectors | |
468 | * currently using @crtc to the atomic configuration @state. Note that this | |
469 | * function must acquire the connection mutex. This can potentially cause | |
470 | * unneeded seralization if the update is just for the planes on one crtc. Hence | |
471 | * drivers and helpers should only call this when really needed (e.g. when a | |
472 | * full modeset needs to happen due to some change). | |
473 | * | |
474 | * Returns: | |
475 | * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK | |
476 | * then the w/w mutex code has detected a deadlock and the entire atomic | |
477 | * sequence must be restarted. All other errors are fatal. | |
478 | */ | |
479 | int | |
480 | drm_atomic_add_affected_connectors(struct drm_atomic_state *state, | |
481 | struct drm_crtc *crtc) | |
482 | { | |
483 | struct drm_mode_config *config = &state->dev->mode_config; | |
484 | struct drm_connector *connector; | |
485 | struct drm_connector_state *conn_state; | |
486 | int ret; | |
487 | ||
488 | ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx); | |
489 | if (ret) | |
490 | return ret; | |
491 | ||
492 | DRM_DEBUG_KMS("Adding all current connectors for [CRTC:%d] to %p\n", | |
493 | crtc->base.id, state); | |
494 | ||
495 | /* | |
496 | * Changed connectors are already in @state, so only need to look at the | |
497 | * current configuration. | |
498 | */ | |
499 | list_for_each_entry(connector, &config->connector_list, head) { | |
500 | if (connector->state->crtc != crtc) | |
501 | continue; | |
502 | ||
503 | conn_state = drm_atomic_get_connector_state(state, connector); | |
504 | if (IS_ERR(conn_state)) | |
505 | return PTR_ERR(conn_state); | |
506 | } | |
507 | ||
508 | return 0; | |
509 | } | |
510 | EXPORT_SYMBOL(drm_atomic_add_affected_connectors); | |
511 | ||
512 | /** | |
513 | * drm_atomic_connectors_for_crtc - count number of connected outputs | |
514 | * @state: atomic state | |
515 | * @crtc: DRM crtc | |
516 | * | |
517 | * This function counts all connectors which will be connected to @crtc | |
518 | * according to @state. Useful to recompute the enable state for @crtc. | |
519 | */ | |
520 | int | |
521 | drm_atomic_connectors_for_crtc(struct drm_atomic_state *state, | |
522 | struct drm_crtc *crtc) | |
523 | { | |
cc4ceb48 DV |
524 | int i, num_connected_connectors = 0; |
525 | ||
f52b69f1 | 526 | for (i = 0; i < state->num_connector; i++) { |
cc4ceb48 DV |
527 | struct drm_connector_state *conn_state; |
528 | ||
529 | conn_state = state->connector_states[i]; | |
530 | ||
531 | if (conn_state && conn_state->crtc == crtc) | |
532 | num_connected_connectors++; | |
533 | } | |
534 | ||
535 | DRM_DEBUG_KMS("State %p has %i connectors for [CRTC:%d]\n", | |
536 | state, num_connected_connectors, crtc->base.id); | |
537 | ||
538 | return num_connected_connectors; | |
539 | } | |
540 | EXPORT_SYMBOL(drm_atomic_connectors_for_crtc); | |
541 | ||
542 | /** | |
543 | * drm_atomic_legacy_backoff - locking backoff for legacy ioctls | |
544 | * @state: atomic state | |
545 | * | |
546 | * This function should be used by legacy entry points which don't understand | |
547 | * -EDEADLK semantics. For simplicity this one will grab all modeset locks after | |
548 | * the slowpath completed. | |
549 | */ | |
550 | void drm_atomic_legacy_backoff(struct drm_atomic_state *state) | |
551 | { | |
552 | int ret; | |
553 | ||
554 | retry: | |
555 | drm_modeset_backoff(state->acquire_ctx); | |
556 | ||
557 | ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex, | |
558 | state->acquire_ctx); | |
559 | if (ret) | |
560 | goto retry; | |
561 | ret = drm_modeset_lock_all_crtcs(state->dev, | |
562 | state->acquire_ctx); | |
563 | if (ret) | |
564 | goto retry; | |
565 | } | |
566 | EXPORT_SYMBOL(drm_atomic_legacy_backoff); | |
567 | ||
568 | /** | |
569 | * drm_atomic_check_only - check whether a given config would work | |
570 | * @state: atomic configuration to check | |
571 | * | |
572 | * Note that this function can return -EDEADLK if the driver needed to acquire | |
573 | * more locks but encountered a deadlock. The caller must then do the usual w/w | |
574 | * backoff dance and restart. All other errors are fatal. | |
575 | * | |
576 | * Returns: | |
577 | * 0 on success, negative error code on failure. | |
578 | */ | |
579 | int drm_atomic_check_only(struct drm_atomic_state *state) | |
580 | { | |
581 | struct drm_mode_config *config = &state->dev->mode_config; | |
582 | ||
583 | DRM_DEBUG_KMS("checking %p\n", state); | |
584 | ||
585 | if (config->funcs->atomic_check) | |
586 | return config->funcs->atomic_check(state->dev, state); | |
587 | else | |
588 | return 0; | |
589 | } | |
590 | EXPORT_SYMBOL(drm_atomic_check_only); | |
591 | ||
592 | /** | |
593 | * drm_atomic_commit - commit configuration atomically | |
594 | * @state: atomic configuration to check | |
595 | * | |
596 | * Note that this function can return -EDEADLK if the driver needed to acquire | |
597 | * more locks but encountered a deadlock. The caller must then do the usual w/w | |
598 | * backoff dance and restart. All other errors are fatal. | |
599 | * | |
600 | * Also note that on successful execution ownership of @state is transferred | |
601 | * from the caller of this function to the function itself. The caller must not | |
602 | * free or in any other way access @state. If the function fails then the caller | |
603 | * must clean up @state itself. | |
604 | * | |
605 | * Returns: | |
606 | * 0 on success, negative error code on failure. | |
607 | */ | |
608 | int drm_atomic_commit(struct drm_atomic_state *state) | |
609 | { | |
610 | struct drm_mode_config *config = &state->dev->mode_config; | |
611 | int ret; | |
612 | ||
613 | ret = drm_atomic_check_only(state); | |
614 | if (ret) | |
615 | return ret; | |
616 | ||
617 | DRM_DEBUG_KMS("commiting %p\n", state); | |
618 | ||
619 | return config->funcs->atomic_commit(state->dev, state, false); | |
620 | } | |
621 | EXPORT_SYMBOL(drm_atomic_commit); | |
622 | ||
623 | /** | |
624 | * drm_atomic_async_commit - atomic&async configuration commit | |
625 | * @state: atomic configuration to check | |
626 | * | |
627 | * Note that this function can return -EDEADLK if the driver needed to acquire | |
628 | * more locks but encountered a deadlock. The caller must then do the usual w/w | |
629 | * backoff dance and restart. All other errors are fatal. | |
630 | * | |
631 | * Also note that on successful execution ownership of @state is transferred | |
632 | * from the caller of this function to the function itself. The caller must not | |
633 | * free or in any other way access @state. If the function fails then the caller | |
634 | * must clean up @state itself. | |
635 | * | |
636 | * Returns: | |
637 | * 0 on success, negative error code on failure. | |
638 | */ | |
639 | int drm_atomic_async_commit(struct drm_atomic_state *state) | |
640 | { | |
641 | struct drm_mode_config *config = &state->dev->mode_config; | |
642 | int ret; | |
643 | ||
644 | ret = drm_atomic_check_only(state); | |
645 | if (ret) | |
646 | return ret; | |
647 | ||
648 | DRM_DEBUG_KMS("commiting %p asynchronously\n", state); | |
649 | ||
650 | return config->funcs->atomic_commit(state->dev, state, true); | |
651 | } | |
652 | EXPORT_SYMBOL(drm_atomic_async_commit); |