xref: /linux/drivers/gpu/drm/drm_atomic.c (revision b3ce7a30847a54a7f96a35e609303d8afecd460b)
1 /*
2  * Copyright (C) 2014 Red Hat
3  * Copyright (C) 2014 Intel Corp.
4  * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  *
24  * Authors:
25  * Rob Clark <robdclark@gmail.com>
26  * Daniel Vetter <daniel.vetter@ffwll.ch>
27  */
28 
29 
30 #include <linux/sync_file.h>
31 
32 #include <drm/drm_atomic.h>
33 #include <drm/drm_atomic_uapi.h>
34 #include <drm/drm_blend.h>
35 #include <drm/drm_bridge.h>
36 #include <drm/drm_debugfs.h>
37 #include <drm/drm_device.h>
38 #include <drm/drm_drv.h>
39 #include <drm/drm_file.h>
40 #include <drm/drm_fourcc.h>
41 #include <drm/drm_framebuffer.h>
42 #include <drm/drm_mode.h>
43 #include <drm/drm_print.h>
44 #include <drm/drm_writeback.h>
45 
46 #include "drm_crtc_internal.h"
47 #include "drm_internal.h"
48 
49 void __drm_crtc_commit_free(struct kref *kref)
50 {
51 	struct drm_crtc_commit *commit =
52 		container_of(kref, struct drm_crtc_commit, ref);
53 
54 	kfree(commit);
55 }
56 EXPORT_SYMBOL(__drm_crtc_commit_free);
57 
58 /**
59  * drm_crtc_commit_wait - Waits for a commit to complete
60  * @commit: &drm_crtc_commit to wait for
61  *
62  * Waits for a given &drm_crtc_commit to be programmed into the
63  * hardware and flipped to.
64  *
65  * Returns:
66  *
67  * 0 on success, a negative error code otherwise.
68  */
69 int drm_crtc_commit_wait(struct drm_crtc_commit *commit)
70 {
71 	unsigned long timeout = 10 * HZ;
72 	int ret;
73 
74 	if (!commit)
75 		return 0;
76 
77 	ret = wait_for_completion_timeout(&commit->hw_done, timeout);
78 	if (!ret) {
79 		drm_err(commit->crtc->dev, "hw_done timed out\n");
80 		return -ETIMEDOUT;
81 	}
82 
83 	/*
84 	 * Currently no support for overwriting flips, hence
85 	 * stall for previous one to execute completely.
86 	 */
87 	ret = wait_for_completion_timeout(&commit->flip_done, timeout);
88 	if (!ret) {
89 		drm_err(commit->crtc->dev, "flip_done timed out\n");
90 		return -ETIMEDOUT;
91 	}
92 
93 	return 0;
94 }
95 EXPORT_SYMBOL(drm_crtc_commit_wait);
96 
97 /**
98  * drm_atomic_state_default_release -
99  * release memory initialized by drm_atomic_state_init
100  * @state: atomic state
101  *
102  * Free all the memory allocated by drm_atomic_state_init.
103  * This should only be used by drivers which are still subclassing
104  * &drm_atomic_state and haven't switched to &drm_private_state yet.
105  */
106 void drm_atomic_state_default_release(struct drm_atomic_state *state)
107 {
108 	kfree(state->connectors);
109 	kfree(state->crtcs);
110 	kfree(state->planes);
111 	kfree(state->private_objs);
112 }
113 EXPORT_SYMBOL(drm_atomic_state_default_release);
114 
115 /**
116  * drm_atomic_state_init - init new atomic state
117  * @dev: DRM device
118  * @state: atomic state
119  *
120  * Default implementation for filling in a new atomic state.
121  * This should only be used by drivers which are still subclassing
122  * &drm_atomic_state and haven't switched to &drm_private_state yet.
123  */
124 int
125 drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
126 {
127 	kref_init(&state->ref);
128 
129 	/* TODO legacy paths should maybe do a better job about
130 	 * setting this appropriately?
131 	 */
132 	state->allow_modeset = true;
133 
134 	state->crtcs = kcalloc(dev->mode_config.num_crtc,
135 			       sizeof(*state->crtcs), GFP_KERNEL);
136 	if (!state->crtcs)
137 		goto fail;
138 	state->planes = kcalloc(dev->mode_config.num_total_plane,
139 				sizeof(*state->planes), GFP_KERNEL);
140 	if (!state->planes)
141 		goto fail;
142 
143 	/*
144 	 * Because drm_atomic_state can be committed asynchronously we need our
145 	 * own reference and cannot rely on the on implied by drm_file in the
146 	 * ioctl call.
147 	 */
148 	drm_dev_get(dev);
149 	state->dev = dev;
150 
151 	drm_dbg_atomic(dev, "Allocated atomic state %p\n", state);
152 
153 	return 0;
154 fail:
155 	drm_atomic_state_default_release(state);
156 	return -ENOMEM;
157 }
158 EXPORT_SYMBOL(drm_atomic_state_init);
159 
160 /**
161  * drm_atomic_state_alloc - allocate atomic state
162  * @dev: DRM device
163  *
164  * This allocates an empty atomic state to track updates.
165  */
166 struct drm_atomic_state *
167 drm_atomic_state_alloc(struct drm_device *dev)
168 {
169 	struct drm_mode_config *config = &dev->mode_config;
170 
171 	if (!config->funcs->atomic_state_alloc) {
172 		struct drm_atomic_state *state;
173 
174 		state = kzalloc(sizeof(*state), GFP_KERNEL);
175 		if (!state)
176 			return NULL;
177 		if (drm_atomic_state_init(dev, state) < 0) {
178 			kfree(state);
179 			return NULL;
180 		}
181 		return state;
182 	}
183 
184 	return config->funcs->atomic_state_alloc(dev);
185 }
186 EXPORT_SYMBOL(drm_atomic_state_alloc);
187 
188 /**
189  * drm_atomic_state_default_clear - clear base atomic state
190  * @state: atomic state
191  *
192  * Default implementation for clearing atomic state.
193  * This should only be used by drivers which are still subclassing
194  * &drm_atomic_state and haven't switched to &drm_private_state yet.
195  */
196 void drm_atomic_state_default_clear(struct drm_atomic_state *state)
197 {
198 	struct drm_device *dev = state->dev;
199 	struct drm_mode_config *config = &dev->mode_config;
200 	int i;
201 
202 	drm_dbg_atomic(dev, "Clearing atomic state %p\n", state);
203 
204 	for (i = 0; i < state->num_connector; i++) {
205 		struct drm_connector *connector = state->connectors[i].ptr;
206 
207 		if (!connector)
208 			continue;
209 
210 		connector->funcs->atomic_destroy_state(connector,
211 						       state->connectors[i].state);
212 		state->connectors[i].ptr = NULL;
213 		state->connectors[i].state = NULL;
214 		state->connectors[i].old_state = NULL;
215 		state->connectors[i].new_state = NULL;
216 		drm_connector_put(connector);
217 	}
218 
219 	for (i = 0; i < config->num_crtc; i++) {
220 		struct drm_crtc *crtc = state->crtcs[i].ptr;
221 
222 		if (!crtc)
223 			continue;
224 
225 		crtc->funcs->atomic_destroy_state(crtc,
226 						  state->crtcs[i].state);
227 
228 		state->crtcs[i].ptr = NULL;
229 		state->crtcs[i].state = NULL;
230 		state->crtcs[i].old_state = NULL;
231 		state->crtcs[i].new_state = NULL;
232 
233 		if (state->crtcs[i].commit) {
234 			drm_crtc_commit_put(state->crtcs[i].commit);
235 			state->crtcs[i].commit = NULL;
236 		}
237 	}
238 
239 	for (i = 0; i < config->num_total_plane; i++) {
240 		struct drm_plane *plane = state->planes[i].ptr;
241 
242 		if (!plane)
243 			continue;
244 
245 		plane->funcs->atomic_destroy_state(plane,
246 						   state->planes[i].state);
247 		state->planes[i].ptr = NULL;
248 		state->planes[i].state = NULL;
249 		state->planes[i].old_state = NULL;
250 		state->planes[i].new_state = NULL;
251 	}
252 
253 	for (i = 0; i < state->num_private_objs; i++) {
254 		struct drm_private_obj *obj = state->private_objs[i].ptr;
255 
256 		obj->funcs->atomic_destroy_state(obj,
257 						 state->private_objs[i].state);
258 		state->private_objs[i].ptr = NULL;
259 		state->private_objs[i].state = NULL;
260 		state->private_objs[i].old_state = NULL;
261 		state->private_objs[i].new_state = NULL;
262 	}
263 	state->num_private_objs = 0;
264 
265 	if (state->fake_commit) {
266 		drm_crtc_commit_put(state->fake_commit);
267 		state->fake_commit = NULL;
268 	}
269 }
270 EXPORT_SYMBOL(drm_atomic_state_default_clear);
271 
272 /**
273  * drm_atomic_state_clear - clear state object
274  * @state: atomic state
275  *
276  * When the w/w mutex algorithm detects a deadlock we need to back off and drop
277  * all locks. So someone else could sneak in and change the current modeset
278  * configuration. Which means that all the state assembled in @state is no
279  * longer an atomic update to the current state, but to some arbitrary earlier
280  * state. Which could break assumptions the driver's
281  * &drm_mode_config_funcs.atomic_check likely relies on.
282  *
283  * Hence we must clear all cached state and completely start over, using this
284  * function.
285  */
286 void drm_atomic_state_clear(struct drm_atomic_state *state)
287 {
288 	struct drm_device *dev = state->dev;
289 	struct drm_mode_config *config = &dev->mode_config;
290 
291 	if (config->funcs->atomic_state_clear)
292 		config->funcs->atomic_state_clear(state);
293 	else
294 		drm_atomic_state_default_clear(state);
295 }
296 EXPORT_SYMBOL(drm_atomic_state_clear);
297 
298 /**
299  * __drm_atomic_state_free - free all memory for an atomic state
300  * @ref: This atomic state to deallocate
301  *
302  * This frees all memory associated with an atomic state, including all the
303  * per-object state for planes, CRTCs and connectors.
304  */
305 void __drm_atomic_state_free(struct kref *ref)
306 {
307 	struct drm_atomic_state *state = container_of(ref, typeof(*state), ref);
308 	struct drm_device *dev = state->dev;
309 	struct drm_mode_config *config = &dev->mode_config;
310 
311 	drm_atomic_state_clear(state);
312 
313 	drm_dbg_atomic(state->dev, "Freeing atomic state %p\n", state);
314 
315 	if (config->funcs->atomic_state_free) {
316 		config->funcs->atomic_state_free(state);
317 	} else {
318 		drm_atomic_state_default_release(state);
319 		kfree(state);
320 	}
321 
322 	drm_dev_put(dev);
323 }
324 EXPORT_SYMBOL(__drm_atomic_state_free);
325 
326 /**
327  * drm_atomic_get_crtc_state - get CRTC state
328  * @state: global atomic state object
329  * @crtc: CRTC to get state object for
330  *
331  * This function returns the CRTC state for the given CRTC, allocating it if
332  * needed. It will also grab the relevant CRTC lock to make sure that the state
333  * is consistent.
334  *
335  * WARNING: Drivers may only add new CRTC states to a @state if
336  * drm_atomic_state.allow_modeset is set, or if it's a driver-internal commit
337  * not created by userspace through an IOCTL call.
338  *
339  * Returns:
340  *
341  * Either the allocated state or the error code encoded into the pointer. When
342  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
343  * entire atomic sequence must be restarted. All other errors are fatal.
344  */
345 struct drm_crtc_state *
346 drm_atomic_get_crtc_state(struct drm_atomic_state *state,
347 			  struct drm_crtc *crtc)
348 {
349 	int ret, index = drm_crtc_index(crtc);
350 	struct drm_crtc_state *crtc_state;
351 
352 	WARN_ON(!state->acquire_ctx);
353 
354 	crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
355 	if (crtc_state)
356 		return crtc_state;
357 
358 	ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);
359 	if (ret)
360 		return ERR_PTR(ret);
361 
362 	crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
363 	if (!crtc_state)
364 		return ERR_PTR(-ENOMEM);
365 
366 	state->crtcs[index].state = crtc_state;
367 	state->crtcs[index].old_state = crtc->state;
368 	state->crtcs[index].new_state = crtc_state;
369 	state->crtcs[index].ptr = crtc;
370 	crtc_state->state = state;
371 
372 	drm_dbg_atomic(state->dev, "Added [CRTC:%d:%s] %p state to %p\n",
373 		       crtc->base.id, crtc->name, crtc_state, state);
374 
375 	return crtc_state;
376 }
377 EXPORT_SYMBOL(drm_atomic_get_crtc_state);
378 
379 static int drm_atomic_crtc_check(const struct drm_crtc_state *old_crtc_state,
380 				 const struct drm_crtc_state *new_crtc_state)
381 {
382 	struct drm_crtc *crtc = new_crtc_state->crtc;
383 
384 	/* NOTE: we explicitly don't enforce constraints such as primary
385 	 * layer covering entire screen, since that is something we want
386 	 * to allow (on hw that supports it).  For hw that does not, it
387 	 * should be checked in driver's crtc->atomic_check() vfunc.
388 	 *
389 	 * TODO: Add generic modeset state checks once we support those.
390 	 */
391 
392 	if (new_crtc_state->active && !new_crtc_state->enable) {
393 		drm_dbg_atomic(crtc->dev,
394 			       "[CRTC:%d:%s] active without enabled\n",
395 			       crtc->base.id, crtc->name);
396 		return -EINVAL;
397 	}
398 
399 	/* The state->enable vs. state->mode_blob checks can be WARN_ON,
400 	 * as this is a kernel-internal detail that userspace should never
401 	 * be able to trigger.
402 	 */
403 	if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
404 	    WARN_ON(new_crtc_state->enable && !new_crtc_state->mode_blob)) {
405 		drm_dbg_atomic(crtc->dev,
406 			       "[CRTC:%d:%s] enabled without mode blob\n",
407 			       crtc->base.id, crtc->name);
408 		return -EINVAL;
409 	}
410 
411 	if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
412 	    WARN_ON(!new_crtc_state->enable && new_crtc_state->mode_blob)) {
413 		drm_dbg_atomic(crtc->dev,
414 			       "[CRTC:%d:%s] disabled with mode blob\n",
415 			       crtc->base.id, crtc->name);
416 		return -EINVAL;
417 	}
418 
419 	/*
420 	 * Reject event generation for when a CRTC is off and stays off.
421 	 * It wouldn't be hard to implement this, but userspace has a track
422 	 * record of happily burning through 100% cpu (or worse, crash) when the
423 	 * display pipe is suspended. To avoid all that fun just reject updates
424 	 * that ask for events since likely that indicates a bug in the
425 	 * compositor's drawing loop. This is consistent with the vblank IOCTL
426 	 * and legacy page_flip IOCTL which also reject service on a disabled
427 	 * pipe.
428 	 */
429 	if (new_crtc_state->event &&
430 	    !new_crtc_state->active && !old_crtc_state->active) {
431 		drm_dbg_atomic(crtc->dev,
432 			       "[CRTC:%d:%s] requesting event but off\n",
433 			       crtc->base.id, crtc->name);
434 		return -EINVAL;
435 	}
436 
437 	return 0;
438 }
439 
440 static void drm_atomic_crtc_print_state(struct drm_printer *p,
441 		const struct drm_crtc_state *state)
442 {
443 	struct drm_crtc *crtc = state->crtc;
444 
445 	drm_printf(p, "crtc[%u]: %s\n", crtc->base.id, crtc->name);
446 	drm_printf(p, "\tenable=%d\n", state->enable);
447 	drm_printf(p, "\tactive=%d\n", state->active);
448 	drm_printf(p, "\tself_refresh_active=%d\n", state->self_refresh_active);
449 	drm_printf(p, "\tplanes_changed=%d\n", state->planes_changed);
450 	drm_printf(p, "\tmode_changed=%d\n", state->mode_changed);
451 	drm_printf(p, "\tactive_changed=%d\n", state->active_changed);
452 	drm_printf(p, "\tconnectors_changed=%d\n", state->connectors_changed);
453 	drm_printf(p, "\tcolor_mgmt_changed=%d\n", state->color_mgmt_changed);
454 	drm_printf(p, "\tplane_mask=%x\n", state->plane_mask);
455 	drm_printf(p, "\tconnector_mask=%x\n", state->connector_mask);
456 	drm_printf(p, "\tencoder_mask=%x\n", state->encoder_mask);
457 	drm_printf(p, "\tmode: " DRM_MODE_FMT "\n", DRM_MODE_ARG(&state->mode));
458 
459 	if (crtc->funcs->atomic_print_state)
460 		crtc->funcs->atomic_print_state(p, state);
461 }
462 
463 static int drm_atomic_connector_check(struct drm_connector *connector,
464 		struct drm_connector_state *state)
465 {
466 	struct drm_crtc_state *crtc_state;
467 	struct drm_writeback_job *writeback_job = state->writeback_job;
468 	const struct drm_display_info *info = &connector->display_info;
469 
470 	state->max_bpc = info->bpc ? info->bpc : 8;
471 	if (connector->max_bpc_property)
472 		state->max_bpc = min(state->max_bpc, state->max_requested_bpc);
473 
474 	if ((connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK) || !writeback_job)
475 		return 0;
476 
477 	if (writeback_job->fb && !state->crtc) {
478 		drm_dbg_atomic(connector->dev,
479 			       "[CONNECTOR:%d:%s] framebuffer without CRTC\n",
480 			       connector->base.id, connector->name);
481 		return -EINVAL;
482 	}
483 
484 	if (state->crtc)
485 		crtc_state = drm_atomic_get_existing_crtc_state(state->state,
486 								state->crtc);
487 
488 	if (writeback_job->fb && !crtc_state->active) {
489 		drm_dbg_atomic(connector->dev,
490 			       "[CONNECTOR:%d:%s] has framebuffer, but [CRTC:%d] is off\n",
491 			       connector->base.id, connector->name,
492 			       state->crtc->base.id);
493 		return -EINVAL;
494 	}
495 
496 	if (!writeback_job->fb) {
497 		if (writeback_job->out_fence) {
498 			drm_dbg_atomic(connector->dev,
499 				       "[CONNECTOR:%d:%s] requesting out-fence without framebuffer\n",
500 				       connector->base.id, connector->name);
501 			return -EINVAL;
502 		}
503 
504 		drm_writeback_cleanup_job(writeback_job);
505 		state->writeback_job = NULL;
506 	}
507 
508 	return 0;
509 }
510 
511 /**
512  * drm_atomic_get_plane_state - get plane state
513  * @state: global atomic state object
514  * @plane: plane to get state object for
515  *
516  * This function returns the plane state for the given plane, allocating it if
517  * needed. It will also grab the relevant plane lock to make sure that the state
518  * is consistent.
519  *
520  * Returns:
521  *
522  * Either the allocated state or the error code encoded into the pointer. When
523  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
524  * entire atomic sequence must be restarted. All other errors are fatal.
525  */
526 struct drm_plane_state *
527 drm_atomic_get_plane_state(struct drm_atomic_state *state,
528 			  struct drm_plane *plane)
529 {
530 	int ret, index = drm_plane_index(plane);
531 	struct drm_plane_state *plane_state;
532 
533 	WARN_ON(!state->acquire_ctx);
534 
535 	/* the legacy pointers should never be set */
536 	WARN_ON(plane->fb);
537 	WARN_ON(plane->old_fb);
538 	WARN_ON(plane->crtc);
539 
540 	plane_state = drm_atomic_get_existing_plane_state(state, plane);
541 	if (plane_state)
542 		return plane_state;
543 
544 	ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
545 	if (ret)
546 		return ERR_PTR(ret);
547 
548 	plane_state = plane->funcs->atomic_duplicate_state(plane);
549 	if (!plane_state)
550 		return ERR_PTR(-ENOMEM);
551 
552 	state->planes[index].state = plane_state;
553 	state->planes[index].ptr = plane;
554 	state->planes[index].old_state = plane->state;
555 	state->planes[index].new_state = plane_state;
556 	plane_state->state = state;
557 
558 	drm_dbg_atomic(plane->dev, "Added [PLANE:%d:%s] %p state to %p\n",
559 		       plane->base.id, plane->name, plane_state, state);
560 
561 	if (plane_state->crtc) {
562 		struct drm_crtc_state *crtc_state;
563 
564 		crtc_state = drm_atomic_get_crtc_state(state,
565 						       plane_state->crtc);
566 		if (IS_ERR(crtc_state))
567 			return ERR_CAST(crtc_state);
568 	}
569 
570 	return plane_state;
571 }
572 EXPORT_SYMBOL(drm_atomic_get_plane_state);
573 
574 static bool
575 plane_switching_crtc(const struct drm_plane_state *old_plane_state,
576 		     const struct drm_plane_state *new_plane_state)
577 {
578 	if (!old_plane_state->crtc || !new_plane_state->crtc)
579 		return false;
580 
581 	if (old_plane_state->crtc == new_plane_state->crtc)
582 		return false;
583 
584 	/* This could be refined, but currently there's no helper or driver code
585 	 * to implement direct switching of active planes nor userspace to take
586 	 * advantage of more direct plane switching without the intermediate
587 	 * full OFF state.
588 	 */
589 	return true;
590 }
591 
592 /**
593  * drm_atomic_plane_check - check plane state
594  * @old_plane_state: old plane state to check
595  * @new_plane_state: new plane state to check
596  *
597  * Provides core sanity checks for plane state.
598  *
599  * RETURNS:
600  * Zero on success, error code on failure
601  */
602 static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
603 				  const struct drm_plane_state *new_plane_state)
604 {
605 	struct drm_plane *plane = new_plane_state->plane;
606 	struct drm_crtc *crtc = new_plane_state->crtc;
607 	const struct drm_framebuffer *fb = new_plane_state->fb;
608 	unsigned int fb_width, fb_height;
609 	struct drm_mode_rect *clips;
610 	uint32_t num_clips;
611 
612 	/* either *both* CRTC and FB must be set, or neither */
613 	if (crtc && !fb) {
614 		drm_dbg_atomic(plane->dev, "[PLANE:%d:%s] CRTC set but no FB\n",
615 			       plane->base.id, plane->name);
616 		return -EINVAL;
617 	} else if (fb && !crtc) {
618 		drm_dbg_atomic(plane->dev, "[PLANE:%d:%s] FB set but no CRTC\n",
619 			       plane->base.id, plane->name);
620 		return -EINVAL;
621 	}
622 
623 	/* if disabled, we don't care about the rest of the state: */
624 	if (!crtc)
625 		return 0;
626 
627 	/* Check whether this plane is usable on this CRTC */
628 	if (!(plane->possible_crtcs & drm_crtc_mask(crtc))) {
629 		drm_dbg_atomic(plane->dev,
630 			       "Invalid [CRTC:%d:%s] for [PLANE:%d:%s]\n",
631 			       crtc->base.id, crtc->name,
632 			       plane->base.id, plane->name);
633 		return -EINVAL;
634 	}
635 
636 	/* Check whether this plane supports the fb pixel format. */
637 	if (!drm_plane_has_format(plane, fb->format->format, fb->modifier)) {
638 		drm_dbg_atomic(plane->dev,
639 			       "[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n",
640 			       plane->base.id, plane->name,
641 			       &fb->format->format, fb->modifier);
642 		return -EINVAL;
643 	}
644 
645 	/* Give drivers some help against integer overflows */
646 	if (new_plane_state->crtc_w > INT_MAX ||
647 	    new_plane_state->crtc_x > INT_MAX - (int32_t) new_plane_state->crtc_w ||
648 	    new_plane_state->crtc_h > INT_MAX ||
649 	    new_plane_state->crtc_y > INT_MAX - (int32_t) new_plane_state->crtc_h) {
650 		drm_dbg_atomic(plane->dev,
651 			       "[PLANE:%d:%s] invalid CRTC coordinates %ux%u+%d+%d\n",
652 			       plane->base.id, plane->name,
653 			       new_plane_state->crtc_w, new_plane_state->crtc_h,
654 			       new_plane_state->crtc_x, new_plane_state->crtc_y);
655 		return -ERANGE;
656 	}
657 
658 	fb_width = fb->width << 16;
659 	fb_height = fb->height << 16;
660 
661 	/* Make sure source coordinates are inside the fb. */
662 	if (new_plane_state->src_w > fb_width ||
663 	    new_plane_state->src_x > fb_width - new_plane_state->src_w ||
664 	    new_plane_state->src_h > fb_height ||
665 	    new_plane_state->src_y > fb_height - new_plane_state->src_h) {
666 		drm_dbg_atomic(plane->dev,
667 			       "[PLANE:%d:%s] invalid source coordinates "
668 			       "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
669 			       plane->base.id, plane->name,
670 			       new_plane_state->src_w >> 16,
671 			       ((new_plane_state->src_w & 0xffff) * 15625) >> 10,
672 			       new_plane_state->src_h >> 16,
673 			       ((new_plane_state->src_h & 0xffff) * 15625) >> 10,
674 			       new_plane_state->src_x >> 16,
675 			       ((new_plane_state->src_x & 0xffff) * 15625) >> 10,
676 			       new_plane_state->src_y >> 16,
677 			       ((new_plane_state->src_y & 0xffff) * 15625) >> 10,
678 			       fb->width, fb->height);
679 		return -ENOSPC;
680 	}
681 
682 	clips = __drm_plane_get_damage_clips(new_plane_state);
683 	num_clips = drm_plane_get_damage_clips_count(new_plane_state);
684 
685 	/* Make sure damage clips are valid and inside the fb. */
686 	while (num_clips > 0) {
687 		if (clips->x1 >= clips->x2 ||
688 		    clips->y1 >= clips->y2 ||
689 		    clips->x1 < 0 ||
690 		    clips->y1 < 0 ||
691 		    clips->x2 > fb_width ||
692 		    clips->y2 > fb_height) {
693 			drm_dbg_atomic(plane->dev,
694 				       "[PLANE:%d:%s] invalid damage clip %d %d %d %d\n",
695 				       plane->base.id, plane->name, clips->x1,
696 				       clips->y1, clips->x2, clips->y2);
697 			return -EINVAL;
698 		}
699 		clips++;
700 		num_clips--;
701 	}
702 
703 	if (plane_switching_crtc(old_plane_state, new_plane_state)) {
704 		drm_dbg_atomic(plane->dev,
705 			       "[PLANE:%d:%s] switching CRTC directly\n",
706 			       plane->base.id, plane->name);
707 		return -EINVAL;
708 	}
709 
710 	return 0;
711 }
712 
713 static void drm_atomic_plane_print_state(struct drm_printer *p,
714 		const struct drm_plane_state *state)
715 {
716 	struct drm_plane *plane = state->plane;
717 	struct drm_rect src  = drm_plane_state_src(state);
718 	struct drm_rect dest = drm_plane_state_dest(state);
719 
720 	drm_printf(p, "plane[%u]: %s\n", plane->base.id, plane->name);
721 	drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
722 	drm_printf(p, "\tfb=%u\n", state->fb ? state->fb->base.id : 0);
723 	if (state->fb)
724 		drm_framebuffer_print_info(p, 2, state->fb);
725 	drm_printf(p, "\tcrtc-pos=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&dest));
726 	drm_printf(p, "\tsrc-pos=" DRM_RECT_FP_FMT "\n", DRM_RECT_FP_ARG(&src));
727 	drm_printf(p, "\trotation=%x\n", state->rotation);
728 	drm_printf(p, "\tnormalized-zpos=%x\n", state->normalized_zpos);
729 	drm_printf(p, "\tcolor-encoding=%s\n",
730 		   drm_get_color_encoding_name(state->color_encoding));
731 	drm_printf(p, "\tcolor-range=%s\n",
732 		   drm_get_color_range_name(state->color_range));
733 	drm_printf(p, "\tcolor_mgmt_changed=%d\n", state->color_mgmt_changed);
734 
735 	if (plane->funcs->atomic_print_state)
736 		plane->funcs->atomic_print_state(p, state);
737 }
738 
739 /**
740  * DOC: handling driver private state
741  *
742  * Very often the DRM objects exposed to userspace in the atomic modeset api
743  * (&drm_connector, &drm_crtc and &drm_plane) do not map neatly to the
744  * underlying hardware. Especially for any kind of shared resources (e.g. shared
745  * clocks, scaler units, bandwidth and fifo limits shared among a group of
746  * planes or CRTCs, and so on) it makes sense to model these as independent
747  * objects. Drivers then need to do similar state tracking and commit ordering for
748  * such private (since not exposed to userspace) objects as the atomic core and
749  * helpers already provide for connectors, planes and CRTCs.
750  *
751  * To make this easier on drivers the atomic core provides some support to track
752  * driver private state objects using struct &drm_private_obj, with the
753  * associated state struct &drm_private_state.
754  *
755  * Similar to userspace-exposed objects, private state structures can be
756  * acquired by calling drm_atomic_get_private_obj_state(). This also takes care
757  * of locking, hence drivers should not have a need to call drm_modeset_lock()
758  * directly. Sequence of the actual hardware state commit is not handled,
759  * drivers might need to keep track of struct drm_crtc_commit within subclassed
760  * structure of &drm_private_state as necessary, e.g. similar to
761  * &drm_plane_state.commit. See also &drm_atomic_state.fake_commit.
762  *
763  * All private state structures contained in a &drm_atomic_state update can be
764  * iterated using for_each_oldnew_private_obj_in_state(),
765  * for_each_new_private_obj_in_state() and for_each_old_private_obj_in_state().
766  * Drivers are recommended to wrap these for each type of driver private state
767  * object they have, filtering on &drm_private_obj.funcs using for_each_if(), at
768  * least if they want to iterate over all objects of a given type.
769  *
770  * An earlier way to handle driver private state was by subclassing struct
771  * &drm_atomic_state. But since that encourages non-standard ways to implement
772  * the check/commit split atomic requires (by using e.g. "check and rollback or
773  * commit instead" of "duplicate state, check, then either commit or release
774  * duplicated state) it is deprecated in favour of using &drm_private_state.
775  */
776 
777 /**
778  * drm_atomic_private_obj_init - initialize private object
779  * @dev: DRM device this object will be attached to
780  * @obj: private object
781  * @state: initial private object state
782  * @funcs: pointer to the struct of function pointers that identify the object
783  * type
784  *
785  * Initialize the private object, which can be embedded into any
786  * driver private object that needs its own atomic state.
787  */
788 void
789 drm_atomic_private_obj_init(struct drm_device *dev,
790 			    struct drm_private_obj *obj,
791 			    struct drm_private_state *state,
792 			    const struct drm_private_state_funcs *funcs)
793 {
794 	memset(obj, 0, sizeof(*obj));
795 
796 	drm_modeset_lock_init(&obj->lock);
797 
798 	obj->state = state;
799 	obj->funcs = funcs;
800 	list_add_tail(&obj->head, &dev->mode_config.privobj_list);
801 
802 	state->obj = obj;
803 }
804 EXPORT_SYMBOL(drm_atomic_private_obj_init);
805 
806 /**
807  * drm_atomic_private_obj_fini - finalize private object
808  * @obj: private object
809  *
810  * Finalize the private object.
811  */
812 void
813 drm_atomic_private_obj_fini(struct drm_private_obj *obj)
814 {
815 	list_del(&obj->head);
816 	obj->funcs->atomic_destroy_state(obj, obj->state);
817 	drm_modeset_lock_fini(&obj->lock);
818 }
819 EXPORT_SYMBOL(drm_atomic_private_obj_fini);
820 
821 /**
822  * drm_atomic_get_private_obj_state - get private object state
823  * @state: global atomic state
824  * @obj: private object to get the state for
825  *
826  * This function returns the private object state for the given private object,
827  * allocating the state if needed. It will also grab the relevant private
828  * object lock to make sure that the state is consistent.
829  *
830  * RETURNS:
831  *
832  * Either the allocated state or the error code encoded into a pointer.
833  */
834 struct drm_private_state *
835 drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
836 				 struct drm_private_obj *obj)
837 {
838 	int index, num_objs, i, ret;
839 	size_t size;
840 	struct __drm_private_objs_state *arr;
841 	struct drm_private_state *obj_state;
842 
843 	for (i = 0; i < state->num_private_objs; i++)
844 		if (obj == state->private_objs[i].ptr)
845 			return state->private_objs[i].state;
846 
847 	ret = drm_modeset_lock(&obj->lock, state->acquire_ctx);
848 	if (ret)
849 		return ERR_PTR(ret);
850 
851 	num_objs = state->num_private_objs + 1;
852 	size = sizeof(*state->private_objs) * num_objs;
853 	arr = krealloc(state->private_objs, size, GFP_KERNEL);
854 	if (!arr)
855 		return ERR_PTR(-ENOMEM);
856 
857 	state->private_objs = arr;
858 	index = state->num_private_objs;
859 	memset(&state->private_objs[index], 0, sizeof(*state->private_objs));
860 
861 	obj_state = obj->funcs->atomic_duplicate_state(obj);
862 	if (!obj_state)
863 		return ERR_PTR(-ENOMEM);
864 
865 	state->private_objs[index].state = obj_state;
866 	state->private_objs[index].old_state = obj->state;
867 	state->private_objs[index].new_state = obj_state;
868 	state->private_objs[index].ptr = obj;
869 	obj_state->state = state;
870 
871 	state->num_private_objs = num_objs;
872 
873 	drm_dbg_atomic(state->dev,
874 		       "Added new private object %p state %p to %p\n",
875 		       obj, obj_state, state);
876 
877 	return obj_state;
878 }
879 EXPORT_SYMBOL(drm_atomic_get_private_obj_state);
880 
881 /**
882  * drm_atomic_get_old_private_obj_state
883  * @state: global atomic state object
884  * @obj: private_obj to grab
885  *
886  * This function returns the old private object state for the given private_obj,
887  * or NULL if the private_obj is not part of the global atomic state.
888  */
889 struct drm_private_state *
890 drm_atomic_get_old_private_obj_state(const struct drm_atomic_state *state,
891 				     struct drm_private_obj *obj)
892 {
893 	int i;
894 
895 	for (i = 0; i < state->num_private_objs; i++)
896 		if (obj == state->private_objs[i].ptr)
897 			return state->private_objs[i].old_state;
898 
899 	return NULL;
900 }
901 EXPORT_SYMBOL(drm_atomic_get_old_private_obj_state);
902 
903 /**
904  * drm_atomic_get_new_private_obj_state
905  * @state: global atomic state object
906  * @obj: private_obj to grab
907  *
908  * This function returns the new private object state for the given private_obj,
909  * or NULL if the private_obj is not part of the global atomic state.
910  */
911 struct drm_private_state *
912 drm_atomic_get_new_private_obj_state(const struct drm_atomic_state *state,
913 				     struct drm_private_obj *obj)
914 {
915 	int i;
916 
917 	for (i = 0; i < state->num_private_objs; i++)
918 		if (obj == state->private_objs[i].ptr)
919 			return state->private_objs[i].new_state;
920 
921 	return NULL;
922 }
923 EXPORT_SYMBOL(drm_atomic_get_new_private_obj_state);
924 
925 /**
926  * drm_atomic_get_old_connector_for_encoder - Get old connector for an encoder
927  * @state: Atomic state
928  * @encoder: The encoder to fetch the connector state for
929  *
930  * This function finds and returns the connector that was connected to @encoder
931  * as specified by the @state.
932  *
933  * If there is no connector in @state which previously had @encoder connected to
934  * it, this function will return NULL. While this may seem like an invalid use
935  * case, it is sometimes useful to differentiate commits which had no prior
936  * connectors attached to @encoder vs ones that did (and to inspect their
937  * state). This is especially true in enable hooks because the pipeline has
938  * changed.
939  *
940  * Returns: The old connector connected to @encoder, or NULL if the encoder is
941  * not connected.
942  */
943 struct drm_connector *
944 drm_atomic_get_old_connector_for_encoder(const struct drm_atomic_state *state,
945 					 struct drm_encoder *encoder)
946 {
947 	struct drm_connector_state *conn_state;
948 	struct drm_connector *connector;
949 	unsigned int i;
950 
951 	for_each_old_connector_in_state(state, connector, conn_state, i) {
952 		if (conn_state->best_encoder == encoder)
953 			return connector;
954 	}
955 
956 	return NULL;
957 }
958 EXPORT_SYMBOL(drm_atomic_get_old_connector_for_encoder);
959 
960 /**
961  * drm_atomic_get_new_connector_for_encoder - Get new connector for an encoder
962  * @state: Atomic state
963  * @encoder: The encoder to fetch the connector state for
964  *
965  * This function finds and returns the connector that will be connected to
966  * @encoder as specified by the @state.
967  *
968  * If there is no connector in @state which will have @encoder connected to it,
969  * this function will return NULL. While this may seem like an invalid use case,
970  * it is sometimes useful to differentiate commits which have no connectors
971  * attached to @encoder vs ones that do (and to inspect their state). This is
972  * especially true in disable hooks because the pipeline will change.
973  *
974  * Returns: The new connector connected to @encoder, or NULL if the encoder is
975  * not connected.
976  */
977 struct drm_connector *
978 drm_atomic_get_new_connector_for_encoder(const struct drm_atomic_state *state,
979 					 struct drm_encoder *encoder)
980 {
981 	struct drm_connector_state *conn_state;
982 	struct drm_connector *connector;
983 	unsigned int i;
984 
985 	for_each_new_connector_in_state(state, connector, conn_state, i) {
986 		if (conn_state->best_encoder == encoder)
987 			return connector;
988 	}
989 
990 	return NULL;
991 }
992 EXPORT_SYMBOL(drm_atomic_get_new_connector_for_encoder);
993 
994 /**
995  * drm_atomic_get_old_crtc_for_encoder - Get old crtc for an encoder
996  * @state: Atomic state
997  * @encoder: The encoder to fetch the crtc state for
998  *
999  * This function finds and returns the crtc that was connected to @encoder
1000  * as specified by the @state.
1001  *
1002  * Returns: The old crtc connected to @encoder, or NULL if the encoder is
1003  * not connected.
1004  */
1005 struct drm_crtc *
1006 drm_atomic_get_old_crtc_for_encoder(struct drm_atomic_state *state,
1007 				    struct drm_encoder *encoder)
1008 {
1009 	struct drm_connector *connector;
1010 	struct drm_connector_state *conn_state;
1011 
1012 	connector = drm_atomic_get_old_connector_for_encoder(state, encoder);
1013 	if (!connector)
1014 		return NULL;
1015 
1016 	conn_state = drm_atomic_get_old_connector_state(state, connector);
1017 	if (!conn_state)
1018 		return NULL;
1019 
1020 	return conn_state->crtc;
1021 }
1022 EXPORT_SYMBOL(drm_atomic_get_old_crtc_for_encoder);
1023 
1024 /**
1025  * drm_atomic_get_new_crtc_for_encoder - Get new crtc for an encoder
1026  * @state: Atomic state
1027  * @encoder: The encoder to fetch the crtc state for
1028  *
1029  * This function finds and returns the crtc that will be connected to @encoder
1030  * as specified by the @state.
1031  *
1032  * Returns: The new crtc connected to @encoder, or NULL if the encoder is
1033  * not connected.
1034  */
1035 struct drm_crtc *
1036 drm_atomic_get_new_crtc_for_encoder(struct drm_atomic_state *state,
1037 				    struct drm_encoder *encoder)
1038 {
1039 	struct drm_connector *connector;
1040 	struct drm_connector_state *conn_state;
1041 
1042 	connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
1043 	if (!connector)
1044 		return NULL;
1045 
1046 	conn_state = drm_atomic_get_new_connector_state(state, connector);
1047 	if (!conn_state)
1048 		return NULL;
1049 
1050 	return conn_state->crtc;
1051 }
1052 EXPORT_SYMBOL(drm_atomic_get_new_crtc_for_encoder);
1053 
1054 /**
1055  * drm_atomic_get_connector_state - get connector state
1056  * @state: global atomic state object
1057  * @connector: connector to get state object for
1058  *
1059  * This function returns the connector state for the given connector,
1060  * allocating it if needed. It will also grab the relevant connector lock to
1061  * make sure that the state is consistent.
1062  *
1063  * Returns:
1064  *
1065  * Either the allocated state or the error code encoded into the pointer. When
1066  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
1067  * entire atomic sequence must be restarted. All other errors are fatal.
1068  */
1069 struct drm_connector_state *
1070 drm_atomic_get_connector_state(struct drm_atomic_state *state,
1071 			  struct drm_connector *connector)
1072 {
1073 	int ret, index;
1074 	struct drm_mode_config *config = &connector->dev->mode_config;
1075 	struct drm_connector_state *connector_state;
1076 
1077 	WARN_ON(!state->acquire_ctx);
1078 
1079 	ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
1080 	if (ret)
1081 		return ERR_PTR(ret);
1082 
1083 	index = drm_connector_index(connector);
1084 
1085 	if (index >= state->num_connector) {
1086 		struct __drm_connnectors_state *c;
1087 		int alloc = max(index + 1, config->num_connector);
1088 
1089 		c = krealloc_array(state->connectors, alloc,
1090 				   sizeof(*state->connectors), GFP_KERNEL);
1091 		if (!c)
1092 			return ERR_PTR(-ENOMEM);
1093 
1094 		state->connectors = c;
1095 		memset(&state->connectors[state->num_connector], 0,
1096 		       sizeof(*state->connectors) * (alloc - state->num_connector));
1097 
1098 		state->num_connector = alloc;
1099 	}
1100 
1101 	if (state->connectors[index].state)
1102 		return state->connectors[index].state;
1103 
1104 	connector_state = connector->funcs->atomic_duplicate_state(connector);
1105 	if (!connector_state)
1106 		return ERR_PTR(-ENOMEM);
1107 
1108 	drm_connector_get(connector);
1109 	state->connectors[index].state = connector_state;
1110 	state->connectors[index].old_state = connector->state;
1111 	state->connectors[index].new_state = connector_state;
1112 	state->connectors[index].ptr = connector;
1113 	connector_state->state = state;
1114 
1115 	drm_dbg_atomic(connector->dev, "Added [CONNECTOR:%d:%s] %p state to %p\n",
1116 			 connector->base.id, connector->name,
1117 			 connector_state, state);
1118 
1119 	if (connector_state->crtc) {
1120 		struct drm_crtc_state *crtc_state;
1121 
1122 		crtc_state = drm_atomic_get_crtc_state(state,
1123 						       connector_state->crtc);
1124 		if (IS_ERR(crtc_state))
1125 			return ERR_CAST(crtc_state);
1126 	}
1127 
1128 	return connector_state;
1129 }
1130 EXPORT_SYMBOL(drm_atomic_get_connector_state);
1131 
1132 static void drm_atomic_connector_print_state(struct drm_printer *p,
1133 		const struct drm_connector_state *state)
1134 {
1135 	struct drm_connector *connector = state->connector;
1136 
1137 	drm_printf(p, "connector[%u]: %s\n", connector->base.id, connector->name);
1138 	drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
1139 	drm_printf(p, "\tself_refresh_aware=%d\n", state->self_refresh_aware);
1140 	drm_printf(p, "\tmax_requested_bpc=%d\n", state->max_requested_bpc);
1141 	drm_printf(p, "\tcolorspace=%s\n", drm_get_colorspace_name(state->colorspace));
1142 
1143 	if (connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
1144 	    connector->connector_type == DRM_MODE_CONNECTOR_HDMIB) {
1145 		drm_printf(p, "\tbroadcast_rgb=%s\n",
1146 			   drm_hdmi_connector_get_broadcast_rgb_name(state->hdmi.broadcast_rgb));
1147 		drm_printf(p, "\tis_limited_range=%c\n", state->hdmi.is_limited_range ? 'y' : 'n');
1148 		drm_printf(p, "\toutput_bpc=%u\n", state->hdmi.output_bpc);
1149 		drm_printf(p, "\toutput_format=%s\n",
1150 			   drm_hdmi_connector_get_output_format_name(state->hdmi.output_format));
1151 		drm_printf(p, "\ttmds_char_rate=%llu\n", state->hdmi.tmds_char_rate);
1152 	}
1153 
1154 	if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
1155 		if (state->writeback_job && state->writeback_job->fb)
1156 			drm_printf(p, "\tfb=%d\n", state->writeback_job->fb->base.id);
1157 
1158 	if (connector->funcs->atomic_print_state)
1159 		connector->funcs->atomic_print_state(p, state);
1160 }
1161 
1162 /**
1163  * drm_atomic_get_bridge_state - get bridge state
1164  * @state: global atomic state object
1165  * @bridge: bridge to get state object for
1166  *
1167  * This function returns the bridge state for the given bridge, allocating it
1168  * if needed. It will also grab the relevant bridge lock to make sure that the
1169  * state is consistent.
1170  *
1171  * Returns:
1172  *
1173  * Either the allocated state or the error code encoded into the pointer. When
1174  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
1175  * entire atomic sequence must be restarted.
1176  */
1177 struct drm_bridge_state *
1178 drm_atomic_get_bridge_state(struct drm_atomic_state *state,
1179 			    struct drm_bridge *bridge)
1180 {
1181 	struct drm_private_state *obj_state;
1182 
1183 	obj_state = drm_atomic_get_private_obj_state(state, &bridge->base);
1184 	if (IS_ERR(obj_state))
1185 		return ERR_CAST(obj_state);
1186 
1187 	return drm_priv_to_bridge_state(obj_state);
1188 }
1189 EXPORT_SYMBOL(drm_atomic_get_bridge_state);
1190 
1191 /**
1192  * drm_atomic_get_old_bridge_state - get old bridge state, if it exists
1193  * @state: global atomic state object
1194  * @bridge: bridge to grab
1195  *
1196  * This function returns the old bridge state for the given bridge, or NULL if
1197  * the bridge is not part of the global atomic state.
1198  */
1199 struct drm_bridge_state *
1200 drm_atomic_get_old_bridge_state(const struct drm_atomic_state *state,
1201 				struct drm_bridge *bridge)
1202 {
1203 	struct drm_private_state *obj_state;
1204 
1205 	obj_state = drm_atomic_get_old_private_obj_state(state, &bridge->base);
1206 	if (!obj_state)
1207 		return NULL;
1208 
1209 	return drm_priv_to_bridge_state(obj_state);
1210 }
1211 EXPORT_SYMBOL(drm_atomic_get_old_bridge_state);
1212 
1213 /**
1214  * drm_atomic_get_new_bridge_state - get new bridge state, if it exists
1215  * @state: global atomic state object
1216  * @bridge: bridge to grab
1217  *
1218  * This function returns the new bridge state for the given bridge, or NULL if
1219  * the bridge is not part of the global atomic state.
1220  */
1221 struct drm_bridge_state *
1222 drm_atomic_get_new_bridge_state(const struct drm_atomic_state *state,
1223 				struct drm_bridge *bridge)
1224 {
1225 	struct drm_private_state *obj_state;
1226 
1227 	obj_state = drm_atomic_get_new_private_obj_state(state, &bridge->base);
1228 	if (!obj_state)
1229 		return NULL;
1230 
1231 	return drm_priv_to_bridge_state(obj_state);
1232 }
1233 EXPORT_SYMBOL(drm_atomic_get_new_bridge_state);
1234 
1235 /**
1236  * drm_atomic_add_encoder_bridges - add bridges attached to an encoder
1237  * @state: atomic state
1238  * @encoder: DRM encoder
1239  *
1240  * This function adds all bridges attached to @encoder. This is needed to add
1241  * bridge states to @state and make them available when
1242  * &drm_bridge_funcs.atomic_check(), &drm_bridge_funcs.atomic_pre_enable(),
1243  * &drm_bridge_funcs.atomic_enable(),
1244  * &drm_bridge_funcs.atomic_disable_post_disable() are called.
1245  *
1246  * Returns:
1247  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1248  * then the w/w mutex code has detected a deadlock and the entire atomic
1249  * sequence must be restarted. All other errors are fatal.
1250  */
1251 int
1252 drm_atomic_add_encoder_bridges(struct drm_atomic_state *state,
1253 			       struct drm_encoder *encoder)
1254 {
1255 	struct drm_bridge_state *bridge_state;
1256 	struct drm_bridge *bridge;
1257 
1258 	if (!encoder)
1259 		return 0;
1260 
1261 	drm_dbg_atomic(encoder->dev,
1262 		       "Adding all bridges for [encoder:%d:%s] to %p\n",
1263 		       encoder->base.id, encoder->name, state);
1264 
1265 	drm_for_each_bridge_in_chain(encoder, bridge) {
1266 		/* Skip bridges that don't implement the atomic state hooks. */
1267 		if (!bridge->funcs->atomic_duplicate_state)
1268 			continue;
1269 
1270 		bridge_state = drm_atomic_get_bridge_state(state, bridge);
1271 		if (IS_ERR(bridge_state))
1272 			return PTR_ERR(bridge_state);
1273 	}
1274 
1275 	return 0;
1276 }
1277 EXPORT_SYMBOL(drm_atomic_add_encoder_bridges);
1278 
1279 /**
1280  * drm_atomic_add_affected_connectors - add connectors for CRTC
1281  * @state: atomic state
1282  * @crtc: DRM CRTC
1283  *
1284  * This function walks the current configuration and adds all connectors
1285  * currently using @crtc to the atomic configuration @state. Note that this
1286  * function must acquire the connection mutex. This can potentially cause
1287  * unneeded serialization if the update is just for the planes on one CRTC. Hence
1288  * drivers and helpers should only call this when really needed (e.g. when a
1289  * full modeset needs to happen due to some change).
1290  *
1291  * Returns:
1292  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1293  * then the w/w mutex code has detected a deadlock and the entire atomic
1294  * sequence must be restarted. All other errors are fatal.
1295  */
1296 int
1297 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
1298 				   struct drm_crtc *crtc)
1299 {
1300 	struct drm_mode_config *config = &state->dev->mode_config;
1301 	struct drm_connector *connector;
1302 	struct drm_connector_state *conn_state;
1303 	struct drm_connector_list_iter conn_iter;
1304 	struct drm_crtc_state *crtc_state;
1305 	int ret;
1306 
1307 	crtc_state = drm_atomic_get_crtc_state(state, crtc);
1308 	if (IS_ERR(crtc_state))
1309 		return PTR_ERR(crtc_state);
1310 
1311 	ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
1312 	if (ret)
1313 		return ret;
1314 
1315 	drm_dbg_atomic(crtc->dev,
1316 		       "Adding all current connectors for [CRTC:%d:%s] to %p\n",
1317 		       crtc->base.id, crtc->name, state);
1318 
1319 	/*
1320 	 * Changed connectors are already in @state, so only need to look
1321 	 * at the connector_mask in crtc_state.
1322 	 */
1323 	drm_connector_list_iter_begin(state->dev, &conn_iter);
1324 	drm_for_each_connector_iter(connector, &conn_iter) {
1325 		if (!(crtc_state->connector_mask & drm_connector_mask(connector)))
1326 			continue;
1327 
1328 		conn_state = drm_atomic_get_connector_state(state, connector);
1329 		if (IS_ERR(conn_state)) {
1330 			drm_connector_list_iter_end(&conn_iter);
1331 			return PTR_ERR(conn_state);
1332 		}
1333 	}
1334 	drm_connector_list_iter_end(&conn_iter);
1335 
1336 	return 0;
1337 }
1338 EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
1339 
1340 /**
1341  * drm_atomic_add_affected_planes - add planes for CRTC
1342  * @state: atomic state
1343  * @crtc: DRM CRTC
1344  *
1345  * This function walks the current configuration and adds all planes
1346  * currently used by @crtc to the atomic configuration @state. This is useful
1347  * when an atomic commit also needs to check all currently enabled plane on
1348  * @crtc, e.g. when changing the mode. It's also useful when re-enabling a CRTC
1349  * to avoid special code to force-enable all planes.
1350  *
1351  * Since acquiring a plane state will always also acquire the w/w mutex of the
1352  * current CRTC for that plane (if there is any) adding all the plane states for
1353  * a CRTC will not reduce parallelism of atomic updates.
1354  *
1355  * Returns:
1356  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1357  * then the w/w mutex code has detected a deadlock and the entire atomic
1358  * sequence must be restarted. All other errors are fatal.
1359  */
1360 int
1361 drm_atomic_add_affected_planes(struct drm_atomic_state *state,
1362 			       struct drm_crtc *crtc)
1363 {
1364 	const struct drm_crtc_state *old_crtc_state =
1365 		drm_atomic_get_old_crtc_state(state, crtc);
1366 	struct drm_plane *plane;
1367 
1368 	WARN_ON(!drm_atomic_get_new_crtc_state(state, crtc));
1369 
1370 	drm_dbg_atomic(crtc->dev,
1371 		       "Adding all current planes for [CRTC:%d:%s] to %p\n",
1372 		       crtc->base.id, crtc->name, state);
1373 
1374 	drm_for_each_plane_mask(plane, state->dev, old_crtc_state->plane_mask) {
1375 		struct drm_plane_state *plane_state =
1376 			drm_atomic_get_plane_state(state, plane);
1377 
1378 		if (IS_ERR(plane_state))
1379 			return PTR_ERR(plane_state);
1380 	}
1381 	return 0;
1382 }
1383 EXPORT_SYMBOL(drm_atomic_add_affected_planes);
1384 
1385 /**
1386  * drm_atomic_check_only - check whether a given config would work
1387  * @state: atomic configuration to check
1388  *
1389  * Note that this function can return -EDEADLK if the driver needed to acquire
1390  * more locks but encountered a deadlock. The caller must then do the usual w/w
1391  * backoff dance and restart. All other errors are fatal.
1392  *
1393  * Returns:
1394  * 0 on success, negative error code on failure.
1395  */
1396 int drm_atomic_check_only(struct drm_atomic_state *state)
1397 {
1398 	struct drm_device *dev = state->dev;
1399 	struct drm_mode_config *config = &dev->mode_config;
1400 	struct drm_plane *plane;
1401 	struct drm_plane_state *old_plane_state;
1402 	struct drm_plane_state *new_plane_state;
1403 	struct drm_crtc *crtc;
1404 	struct drm_crtc_state *old_crtc_state;
1405 	struct drm_crtc_state *new_crtc_state;
1406 	struct drm_connector *conn;
1407 	struct drm_connector_state *conn_state;
1408 	unsigned int requested_crtc = 0;
1409 	unsigned int affected_crtc = 0;
1410 	int i, ret = 0;
1411 
1412 	drm_dbg_atomic(dev, "checking %p\n", state);
1413 
1414 	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1415 		if (new_crtc_state->enable)
1416 			requested_crtc |= drm_crtc_mask(crtc);
1417 	}
1418 
1419 	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
1420 		ret = drm_atomic_plane_check(old_plane_state, new_plane_state);
1421 		if (ret) {
1422 			drm_dbg_atomic(dev, "[PLANE:%d:%s] atomic core check failed\n",
1423 				       plane->base.id, plane->name);
1424 			return ret;
1425 		}
1426 	}
1427 
1428 	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
1429 		ret = drm_atomic_crtc_check(old_crtc_state, new_crtc_state);
1430 		if (ret) {
1431 			drm_dbg_atomic(dev, "[CRTC:%d:%s] atomic core check failed\n",
1432 				       crtc->base.id, crtc->name);
1433 			return ret;
1434 		}
1435 	}
1436 
1437 	for_each_new_connector_in_state(state, conn, conn_state, i) {
1438 		ret = drm_atomic_connector_check(conn, conn_state);
1439 		if (ret) {
1440 			drm_dbg_atomic(dev, "[CONNECTOR:%d:%s] atomic core check failed\n",
1441 				       conn->base.id, conn->name);
1442 			return ret;
1443 		}
1444 	}
1445 
1446 	if (config->funcs->atomic_check) {
1447 		ret = config->funcs->atomic_check(state->dev, state);
1448 
1449 		if (ret) {
1450 			drm_dbg_atomic(dev, "atomic driver check for %p failed: %d\n",
1451 				       state, ret);
1452 			return ret;
1453 		}
1454 	}
1455 
1456 	if (!state->allow_modeset) {
1457 		for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1458 			if (drm_atomic_crtc_needs_modeset(new_crtc_state)) {
1459 				drm_dbg_atomic(dev, "[CRTC:%d:%s] requires full modeset\n",
1460 					       crtc->base.id, crtc->name);
1461 				return -EINVAL;
1462 			}
1463 		}
1464 	}
1465 
1466 	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1467 		if (new_crtc_state->enable)
1468 			affected_crtc |= drm_crtc_mask(crtc);
1469 	}
1470 
1471 	/*
1472 	 * For commits that allow modesets drivers can add other CRTCs to the
1473 	 * atomic commit, e.g. when they need to reallocate global resources.
1474 	 * This can cause spurious EBUSY, which robs compositors of a very
1475 	 * effective sanity check for their drawing loop. Therefor only allow
1476 	 * drivers to add unrelated CRTC states for modeset commits.
1477 	 *
1478 	 * FIXME: Should add affected_crtc mask to the ATOMIC IOCTL as an output
1479 	 * so compositors know what's going on.
1480 	 */
1481 	if (affected_crtc != requested_crtc) {
1482 		drm_dbg_atomic(dev,
1483 			       "driver added CRTC to commit: requested 0x%x, affected 0x%0x\n",
1484 			       requested_crtc, affected_crtc);
1485 		WARN(!state->allow_modeset, "adding CRTC not allowed without modesets: requested 0x%x, affected 0x%0x\n",
1486 		     requested_crtc, affected_crtc);
1487 	}
1488 
1489 	return 0;
1490 }
1491 EXPORT_SYMBOL(drm_atomic_check_only);
1492 
1493 /**
1494  * drm_atomic_commit - commit configuration atomically
1495  * @state: atomic configuration to check
1496  *
1497  * Note that this function can return -EDEADLK if the driver needed to acquire
1498  * more locks but encountered a deadlock. The caller must then do the usual w/w
1499  * backoff dance and restart. All other errors are fatal.
1500  *
1501  * This function will take its own reference on @state.
1502  * Callers should always release their reference with drm_atomic_state_put().
1503  *
1504  * Returns:
1505  * 0 on success, negative error code on failure.
1506  */
1507 int drm_atomic_commit(struct drm_atomic_state *state)
1508 {
1509 	struct drm_mode_config *config = &state->dev->mode_config;
1510 	struct drm_printer p = drm_info_printer(state->dev->dev);
1511 	int ret;
1512 
1513 	if (drm_debug_enabled(DRM_UT_STATE))
1514 		drm_atomic_print_new_state(state, &p);
1515 
1516 	ret = drm_atomic_check_only(state);
1517 	if (ret)
1518 		return ret;
1519 
1520 	drm_dbg_atomic(state->dev, "committing %p\n", state);
1521 
1522 	return config->funcs->atomic_commit(state->dev, state, false);
1523 }
1524 EXPORT_SYMBOL(drm_atomic_commit);
1525 
1526 /**
1527  * drm_atomic_nonblocking_commit - atomic nonblocking commit
1528  * @state: atomic configuration to check
1529  *
1530  * Note that this function can return -EDEADLK if the driver needed to acquire
1531  * more locks but encountered a deadlock. The caller must then do the usual w/w
1532  * backoff dance and restart. All other errors are fatal.
1533  *
1534  * This function will take its own reference on @state.
1535  * Callers should always release their reference with drm_atomic_state_put().
1536  *
1537  * Returns:
1538  * 0 on success, negative error code on failure.
1539  */
1540 int drm_atomic_nonblocking_commit(struct drm_atomic_state *state)
1541 {
1542 	struct drm_mode_config *config = &state->dev->mode_config;
1543 	int ret;
1544 
1545 	ret = drm_atomic_check_only(state);
1546 	if (ret)
1547 		return ret;
1548 
1549 	drm_dbg_atomic(state->dev, "committing %p nonblocking\n", state);
1550 
1551 	return config->funcs->atomic_commit(state->dev, state, true);
1552 }
1553 EXPORT_SYMBOL(drm_atomic_nonblocking_commit);
1554 
1555 /* just used from drm-client and atomic-helper: */
1556 int __drm_atomic_helper_disable_plane(struct drm_plane *plane,
1557 				      struct drm_plane_state *plane_state)
1558 {
1559 	int ret;
1560 
1561 	ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
1562 	if (ret != 0)
1563 		return ret;
1564 
1565 	drm_atomic_set_fb_for_plane(plane_state, NULL);
1566 	plane_state->crtc_x = 0;
1567 	plane_state->crtc_y = 0;
1568 	plane_state->crtc_w = 0;
1569 	plane_state->crtc_h = 0;
1570 	plane_state->src_x = 0;
1571 	plane_state->src_y = 0;
1572 	plane_state->src_w = 0;
1573 	plane_state->src_h = 0;
1574 
1575 	return 0;
1576 }
1577 EXPORT_SYMBOL(__drm_atomic_helper_disable_plane);
1578 
1579 static int update_output_state(struct drm_atomic_state *state,
1580 			       struct drm_mode_set *set)
1581 {
1582 	struct drm_device *dev = set->crtc->dev;
1583 	struct drm_crtc *crtc;
1584 	struct drm_crtc_state *new_crtc_state;
1585 	struct drm_connector *connector;
1586 	struct drm_connector_state *new_conn_state;
1587 	int ret, i;
1588 
1589 	ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
1590 			       state->acquire_ctx);
1591 	if (ret)
1592 		return ret;
1593 
1594 	/* First disable all connectors on the target crtc. */
1595 	ret = drm_atomic_add_affected_connectors(state, set->crtc);
1596 	if (ret)
1597 		return ret;
1598 
1599 	for_each_new_connector_in_state(state, connector, new_conn_state, i) {
1600 		if (new_conn_state->crtc == set->crtc) {
1601 			ret = drm_atomic_set_crtc_for_connector(new_conn_state,
1602 								NULL);
1603 			if (ret)
1604 				return ret;
1605 
1606 			/* Make sure legacy setCrtc always re-trains */
1607 			new_conn_state->link_status = DRM_LINK_STATUS_GOOD;
1608 		}
1609 	}
1610 
1611 	/* Then set all connectors from set->connectors on the target crtc */
1612 	for (i = 0; i < set->num_connectors; i++) {
1613 		new_conn_state = drm_atomic_get_connector_state(state,
1614 								set->connectors[i]);
1615 		if (IS_ERR(new_conn_state))
1616 			return PTR_ERR(new_conn_state);
1617 
1618 		ret = drm_atomic_set_crtc_for_connector(new_conn_state,
1619 							set->crtc);
1620 		if (ret)
1621 			return ret;
1622 	}
1623 
1624 	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1625 		/*
1626 		 * Don't update ->enable for the CRTC in the set_config request,
1627 		 * since a mismatch would indicate a bug in the upper layers.
1628 		 * The actual modeset code later on will catch any
1629 		 * inconsistencies here.
1630 		 */
1631 		if (crtc == set->crtc)
1632 			continue;
1633 
1634 		if (!new_crtc_state->connector_mask) {
1635 			ret = drm_atomic_set_mode_prop_for_crtc(new_crtc_state,
1636 								NULL);
1637 			if (ret < 0)
1638 				return ret;
1639 
1640 			new_crtc_state->active = false;
1641 		}
1642 	}
1643 
1644 	return 0;
1645 }
1646 
1647 /* just used from drm-client and atomic-helper: */
1648 int __drm_atomic_helper_set_config(struct drm_mode_set *set,
1649 				   struct drm_atomic_state *state)
1650 {
1651 	struct drm_crtc_state *crtc_state;
1652 	struct drm_plane_state *primary_state;
1653 	struct drm_crtc *crtc = set->crtc;
1654 	int hdisplay, vdisplay;
1655 	int ret;
1656 
1657 	crtc_state = drm_atomic_get_crtc_state(state, crtc);
1658 	if (IS_ERR(crtc_state))
1659 		return PTR_ERR(crtc_state);
1660 
1661 	primary_state = drm_atomic_get_plane_state(state, crtc->primary);
1662 	if (IS_ERR(primary_state))
1663 		return PTR_ERR(primary_state);
1664 
1665 	if (!set->mode) {
1666 		WARN_ON(set->fb);
1667 		WARN_ON(set->num_connectors);
1668 
1669 		ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
1670 		if (ret != 0)
1671 			return ret;
1672 
1673 		crtc_state->active = false;
1674 
1675 		ret = drm_atomic_set_crtc_for_plane(primary_state, NULL);
1676 		if (ret != 0)
1677 			return ret;
1678 
1679 		drm_atomic_set_fb_for_plane(primary_state, NULL);
1680 
1681 		goto commit;
1682 	}
1683 
1684 	WARN_ON(!set->fb);
1685 	WARN_ON(!set->num_connectors);
1686 
1687 	ret = drm_atomic_set_mode_for_crtc(crtc_state, set->mode);
1688 	if (ret != 0)
1689 		return ret;
1690 
1691 	crtc_state->active = true;
1692 
1693 	ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
1694 	if (ret != 0)
1695 		return ret;
1696 
1697 	drm_mode_get_hv_timing(set->mode, &hdisplay, &vdisplay);
1698 
1699 	drm_atomic_set_fb_for_plane(primary_state, set->fb);
1700 	primary_state->crtc_x = 0;
1701 	primary_state->crtc_y = 0;
1702 	primary_state->crtc_w = hdisplay;
1703 	primary_state->crtc_h = vdisplay;
1704 	primary_state->src_x = set->x << 16;
1705 	primary_state->src_y = set->y << 16;
1706 	if (drm_rotation_90_or_270(primary_state->rotation)) {
1707 		primary_state->src_w = vdisplay << 16;
1708 		primary_state->src_h = hdisplay << 16;
1709 	} else {
1710 		primary_state->src_w = hdisplay << 16;
1711 		primary_state->src_h = vdisplay << 16;
1712 	}
1713 
1714 commit:
1715 	ret = update_output_state(state, set);
1716 	if (ret)
1717 		return ret;
1718 
1719 	return 0;
1720 }
1721 EXPORT_SYMBOL(__drm_atomic_helper_set_config);
1722 
1723 static void drm_atomic_private_obj_print_state(struct drm_printer *p,
1724 					       const struct drm_private_state *state)
1725 {
1726 	struct drm_private_obj *obj = state->obj;
1727 
1728 	if (obj->funcs->atomic_print_state)
1729 		obj->funcs->atomic_print_state(p, state);
1730 }
1731 
1732 /**
1733  * drm_atomic_print_new_state - prints drm atomic state
1734  * @state: atomic configuration to check
1735  * @p: drm printer
1736  *
1737  * This functions prints the drm atomic state snapshot using the drm printer
1738  * which is passed to it. This snapshot can be used for debugging purposes.
1739  *
1740  * Note that this function looks into the new state objects and hence its not
1741  * safe to be used after the call to drm_atomic_helper_commit_hw_done().
1742  */
1743 void drm_atomic_print_new_state(const struct drm_atomic_state *state,
1744 		struct drm_printer *p)
1745 {
1746 	struct drm_plane *plane;
1747 	struct drm_plane_state *plane_state;
1748 	struct drm_crtc *crtc;
1749 	struct drm_crtc_state *crtc_state;
1750 	struct drm_connector *connector;
1751 	struct drm_connector_state *connector_state;
1752 	struct drm_private_obj *obj;
1753 	struct drm_private_state *obj_state;
1754 	int i;
1755 
1756 	if (!p) {
1757 		drm_err(state->dev, "invalid drm printer\n");
1758 		return;
1759 	}
1760 
1761 	drm_dbg_atomic(state->dev, "checking %p\n", state);
1762 
1763 	for_each_new_plane_in_state(state, plane, plane_state, i)
1764 		drm_atomic_plane_print_state(p, plane_state);
1765 
1766 	for_each_new_crtc_in_state(state, crtc, crtc_state, i)
1767 		drm_atomic_crtc_print_state(p, crtc_state);
1768 
1769 	for_each_new_connector_in_state(state, connector, connector_state, i)
1770 		drm_atomic_connector_print_state(p, connector_state);
1771 
1772 	for_each_new_private_obj_in_state(state, obj, obj_state, i)
1773 		drm_atomic_private_obj_print_state(p, obj_state);
1774 }
1775 EXPORT_SYMBOL(drm_atomic_print_new_state);
1776 
1777 static void __drm_state_dump(struct drm_device *dev, struct drm_printer *p,
1778 			     bool take_locks)
1779 {
1780 	struct drm_mode_config *config = &dev->mode_config;
1781 	struct drm_plane *plane;
1782 	struct drm_crtc *crtc;
1783 	struct drm_connector *connector;
1784 	struct drm_connector_list_iter conn_iter;
1785 	struct drm_private_obj *obj;
1786 
1787 	if (!drm_drv_uses_atomic_modeset(dev))
1788 		return;
1789 
1790 	list_for_each_entry(plane, &config->plane_list, head) {
1791 		if (take_locks)
1792 			drm_modeset_lock(&plane->mutex, NULL);
1793 		drm_atomic_plane_print_state(p, plane->state);
1794 		if (take_locks)
1795 			drm_modeset_unlock(&plane->mutex);
1796 	}
1797 
1798 	list_for_each_entry(crtc, &config->crtc_list, head) {
1799 		if (take_locks)
1800 			drm_modeset_lock(&crtc->mutex, NULL);
1801 		drm_atomic_crtc_print_state(p, crtc->state);
1802 		if (take_locks)
1803 			drm_modeset_unlock(&crtc->mutex);
1804 	}
1805 
1806 	drm_connector_list_iter_begin(dev, &conn_iter);
1807 	if (take_locks)
1808 		drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1809 	drm_for_each_connector_iter(connector, &conn_iter)
1810 		drm_atomic_connector_print_state(p, connector->state);
1811 	if (take_locks)
1812 		drm_modeset_unlock(&dev->mode_config.connection_mutex);
1813 	drm_connector_list_iter_end(&conn_iter);
1814 
1815 	list_for_each_entry(obj, &config->privobj_list, head) {
1816 		if (take_locks)
1817 			drm_modeset_lock(&obj->lock, NULL);
1818 		drm_atomic_private_obj_print_state(p, obj->state);
1819 		if (take_locks)
1820 			drm_modeset_unlock(&obj->lock);
1821 	}
1822 }
1823 
1824 /**
1825  * drm_state_dump - dump entire device atomic state
1826  * @dev: the drm device
1827  * @p: where to print the state to
1828  *
1829  * Just for debugging.  Drivers might want an option to dump state
1830  * to dmesg in case of error irq's.  (Hint, you probably want to
1831  * ratelimit this!)
1832  *
1833  * The caller must wrap this drm_modeset_lock_all_ctx() and
1834  * drm_modeset_drop_locks(). If this is called from error irq handler, it should
1835  * not be enabled by default - if you are debugging errors you might
1836  * not care that this is racey, but calling this without all modeset locks held
1837  * is inherently unsafe.
1838  */
1839 void drm_state_dump(struct drm_device *dev, struct drm_printer *p)
1840 {
1841 	__drm_state_dump(dev, p, false);
1842 }
1843 EXPORT_SYMBOL(drm_state_dump);
1844 
1845 #ifdef CONFIG_DEBUG_FS
1846 static int drm_state_info(struct seq_file *m, void *data)
1847 {
1848 	struct drm_debugfs_entry *entry = m->private;
1849 	struct drm_device *dev = entry->dev;
1850 	struct drm_printer p = drm_seq_file_printer(m);
1851 
1852 	__drm_state_dump(dev, &p, true);
1853 
1854 	return 0;
1855 }
1856 
1857 /* any use in debugfs files to dump individual planes/crtc/etc? */
1858 static const struct drm_debugfs_info drm_atomic_debugfs_list[] = {
1859 	{"state", drm_state_info, 0},
1860 };
1861 
1862 void drm_atomic_debugfs_init(struct drm_device *dev)
1863 {
1864 	drm_debugfs_add_files(dev, drm_atomic_debugfs_list,
1865 			      ARRAY_SIZE(drm_atomic_debugfs_list));
1866 }
1867 #endif
1868