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 
__drm_crtc_commit_free(struct kref * kref)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  */
drm_crtc_commit_wait(struct drm_crtc_commit * commit)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  */
drm_atomic_state_default_release(struct drm_atomic_state * state)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
drm_atomic_state_init(struct drm_device * dev,struct drm_atomic_state * state)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 *
drm_atomic_state_alloc(struct drm_device * dev)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  */
drm_atomic_state_default_clear(struct drm_atomic_state * state)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  */
drm_atomic_state_clear(struct drm_atomic_state * state)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  */
__drm_atomic_state_free(struct kref * ref)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 *
drm_atomic_get_crtc_state(struct drm_atomic_state * state,struct drm_crtc * crtc)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 
drm_atomic_crtc_check(const struct drm_crtc_state * old_crtc_state,const struct drm_crtc_state * new_crtc_state)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 
drm_atomic_crtc_print_state(struct drm_printer * p,const struct drm_crtc_state * state)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 
drm_atomic_connector_check(struct drm_connector * connector,struct drm_connector_state * state)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 *
drm_atomic_get_plane_state(struct drm_atomic_state * state,struct drm_plane * plane)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
plane_switching_crtc(const struct drm_plane_state * old_plane_state,const struct drm_plane_state * new_plane_state)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  */
drm_atomic_plane_check(const struct drm_plane_state * old_plane_state,const struct drm_plane_state * new_plane_state)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 	int ret;
612 
613 	/* either *both* CRTC and FB must be set, or neither */
614 	if (crtc && !fb) {
615 		drm_dbg_atomic(plane->dev, "[PLANE:%d:%s] CRTC set but no FB\n",
616 			       plane->base.id, plane->name);
617 		return -EINVAL;
618 	} else if (fb && !crtc) {
619 		drm_dbg_atomic(plane->dev, "[PLANE:%d:%s] FB set but no CRTC\n",
620 			       plane->base.id, plane->name);
621 		return -EINVAL;
622 	}
623 
624 	/* if disabled, we don't care about the rest of the state: */
625 	if (!crtc)
626 		return 0;
627 
628 	/* Check whether this plane is usable on this CRTC */
629 	if (!(plane->possible_crtcs & drm_crtc_mask(crtc))) {
630 		drm_dbg_atomic(plane->dev,
631 			       "Invalid [CRTC:%d:%s] for [PLANE:%d:%s]\n",
632 			       crtc->base.id, crtc->name,
633 			       plane->base.id, plane->name);
634 		return -EINVAL;
635 	}
636 
637 	/* Check whether this plane supports the fb pixel format. */
638 	ret = drm_plane_check_pixel_format(plane, fb->format->format,
639 					   fb->modifier);
640 	if (ret) {
641 		drm_dbg_atomic(plane->dev,
642 			       "[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n",
643 			       plane->base.id, plane->name,
644 			       &fb->format->format, fb->modifier);
645 		return ret;
646 	}
647 
648 	/* Give drivers some help against integer overflows */
649 	if (new_plane_state->crtc_w > INT_MAX ||
650 	    new_plane_state->crtc_x > INT_MAX - (int32_t) new_plane_state->crtc_w ||
651 	    new_plane_state->crtc_h > INT_MAX ||
652 	    new_plane_state->crtc_y > INT_MAX - (int32_t) new_plane_state->crtc_h) {
653 		drm_dbg_atomic(plane->dev,
654 			       "[PLANE:%d:%s] invalid CRTC coordinates %ux%u+%d+%d\n",
655 			       plane->base.id, plane->name,
656 			       new_plane_state->crtc_w, new_plane_state->crtc_h,
657 			       new_plane_state->crtc_x, new_plane_state->crtc_y);
658 		return -ERANGE;
659 	}
660 
661 	fb_width = fb->width << 16;
662 	fb_height = fb->height << 16;
663 
664 	/* Make sure source coordinates are inside the fb. */
665 	if (new_plane_state->src_w > fb_width ||
666 	    new_plane_state->src_x > fb_width - new_plane_state->src_w ||
667 	    new_plane_state->src_h > fb_height ||
668 	    new_plane_state->src_y > fb_height - new_plane_state->src_h) {
669 		drm_dbg_atomic(plane->dev,
670 			       "[PLANE:%d:%s] invalid source coordinates "
671 			       "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
672 			       plane->base.id, plane->name,
673 			       new_plane_state->src_w >> 16,
674 			       ((new_plane_state->src_w & 0xffff) * 15625) >> 10,
675 			       new_plane_state->src_h >> 16,
676 			       ((new_plane_state->src_h & 0xffff) * 15625) >> 10,
677 			       new_plane_state->src_x >> 16,
678 			       ((new_plane_state->src_x & 0xffff) * 15625) >> 10,
679 			       new_plane_state->src_y >> 16,
680 			       ((new_plane_state->src_y & 0xffff) * 15625) >> 10,
681 			       fb->width, fb->height);
682 		return -ENOSPC;
683 	}
684 
685 	clips = __drm_plane_get_damage_clips(new_plane_state);
686 	num_clips = drm_plane_get_damage_clips_count(new_plane_state);
687 
688 	/* Make sure damage clips are valid and inside the fb. */
689 	while (num_clips > 0) {
690 		if (clips->x1 >= clips->x2 ||
691 		    clips->y1 >= clips->y2 ||
692 		    clips->x1 < 0 ||
693 		    clips->y1 < 0 ||
694 		    clips->x2 > fb_width ||
695 		    clips->y2 > fb_height) {
696 			drm_dbg_atomic(plane->dev,
697 				       "[PLANE:%d:%s] invalid damage clip %d %d %d %d\n",
698 				       plane->base.id, plane->name, clips->x1,
699 				       clips->y1, clips->x2, clips->y2);
700 			return -EINVAL;
701 		}
702 		clips++;
703 		num_clips--;
704 	}
705 
706 	if (plane_switching_crtc(old_plane_state, new_plane_state)) {
707 		drm_dbg_atomic(plane->dev,
708 			       "[PLANE:%d:%s] switching CRTC directly\n",
709 			       plane->base.id, plane->name);
710 		return -EINVAL;
711 	}
712 
713 	return 0;
714 }
715 
drm_atomic_plane_print_state(struct drm_printer * p,const struct drm_plane_state * state)716 static void drm_atomic_plane_print_state(struct drm_printer *p,
717 		const struct drm_plane_state *state)
718 {
719 	struct drm_plane *plane = state->plane;
720 	struct drm_rect src  = drm_plane_state_src(state);
721 	struct drm_rect dest = drm_plane_state_dest(state);
722 
723 	drm_printf(p, "plane[%u]: %s\n", plane->base.id, plane->name);
724 	drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
725 	drm_printf(p, "\tfb=%u\n", state->fb ? state->fb->base.id : 0);
726 	if (state->fb)
727 		drm_framebuffer_print_info(p, 2, state->fb);
728 	drm_printf(p, "\tcrtc-pos=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&dest));
729 	drm_printf(p, "\tsrc-pos=" DRM_RECT_FP_FMT "\n", DRM_RECT_FP_ARG(&src));
730 	drm_printf(p, "\trotation=%x\n", state->rotation);
731 	drm_printf(p, "\tnormalized-zpos=%x\n", state->normalized_zpos);
732 	drm_printf(p, "\tcolor-encoding=%s\n",
733 		   drm_get_color_encoding_name(state->color_encoding));
734 	drm_printf(p, "\tcolor-range=%s\n",
735 		   drm_get_color_range_name(state->color_range));
736 
737 	if (plane->funcs->atomic_print_state)
738 		plane->funcs->atomic_print_state(p, state);
739 }
740 
741 /**
742  * DOC: handling driver private state
743  *
744  * Very often the DRM objects exposed to userspace in the atomic modeset api
745  * (&drm_connector, &drm_crtc and &drm_plane) do not map neatly to the
746  * underlying hardware. Especially for any kind of shared resources (e.g. shared
747  * clocks, scaler units, bandwidth and fifo limits shared among a group of
748  * planes or CRTCs, and so on) it makes sense to model these as independent
749  * objects. Drivers then need to do similar state tracking and commit ordering for
750  * such private (since not exposed to userspace) objects as the atomic core and
751  * helpers already provide for connectors, planes and CRTCs.
752  *
753  * To make this easier on drivers the atomic core provides some support to track
754  * driver private state objects using struct &drm_private_obj, with the
755  * associated state struct &drm_private_state.
756  *
757  * Similar to userspace-exposed objects, private state structures can be
758  * acquired by calling drm_atomic_get_private_obj_state(). This also takes care
759  * of locking, hence drivers should not have a need to call drm_modeset_lock()
760  * directly. Sequence of the actual hardware state commit is not handled,
761  * drivers might need to keep track of struct drm_crtc_commit within subclassed
762  * structure of &drm_private_state as necessary, e.g. similar to
763  * &drm_plane_state.commit. See also &drm_atomic_state.fake_commit.
764  *
765  * All private state structures contained in a &drm_atomic_state update can be
766  * iterated using for_each_oldnew_private_obj_in_state(),
767  * for_each_new_private_obj_in_state() and for_each_old_private_obj_in_state().
768  * Drivers are recommended to wrap these for each type of driver private state
769  * object they have, filtering on &drm_private_obj.funcs using for_each_if(), at
770  * least if they want to iterate over all objects of a given type.
771  *
772  * An earlier way to handle driver private state was by subclassing struct
773  * &drm_atomic_state. But since that encourages non-standard ways to implement
774  * the check/commit split atomic requires (by using e.g. "check and rollback or
775  * commit instead" of "duplicate state, check, then either commit or release
776  * duplicated state) it is deprecated in favour of using &drm_private_state.
777  */
778 
779 /**
780  * drm_atomic_private_obj_init - initialize private object
781  * @dev: DRM device this object will be attached to
782  * @obj: private object
783  * @state: initial private object state
784  * @funcs: pointer to the struct of function pointers that identify the object
785  * type
786  *
787  * Initialize the private object, which can be embedded into any
788  * driver private object that needs its own atomic state.
789  */
790 void
drm_atomic_private_obj_init(struct drm_device * dev,struct drm_private_obj * obj,struct drm_private_state * state,const struct drm_private_state_funcs * funcs)791 drm_atomic_private_obj_init(struct drm_device *dev,
792 			    struct drm_private_obj *obj,
793 			    struct drm_private_state *state,
794 			    const struct drm_private_state_funcs *funcs)
795 {
796 	memset(obj, 0, sizeof(*obj));
797 
798 	drm_modeset_lock_init(&obj->lock);
799 
800 	obj->state = state;
801 	obj->funcs = funcs;
802 	list_add_tail(&obj->head, &dev->mode_config.privobj_list);
803 
804 	state->obj = obj;
805 }
806 EXPORT_SYMBOL(drm_atomic_private_obj_init);
807 
808 /**
809  * drm_atomic_private_obj_fini - finalize private object
810  * @obj: private object
811  *
812  * Finalize the private object.
813  */
814 void
drm_atomic_private_obj_fini(struct drm_private_obj * obj)815 drm_atomic_private_obj_fini(struct drm_private_obj *obj)
816 {
817 	list_del(&obj->head);
818 	obj->funcs->atomic_destroy_state(obj, obj->state);
819 	drm_modeset_lock_fini(&obj->lock);
820 }
821 EXPORT_SYMBOL(drm_atomic_private_obj_fini);
822 
823 /**
824  * drm_atomic_get_private_obj_state - get private object state
825  * @state: global atomic state
826  * @obj: private object to get the state for
827  *
828  * This function returns the private object state for the given private object,
829  * allocating the state if needed. It will also grab the relevant private
830  * object lock to make sure that the state is consistent.
831  *
832  * RETURNS:
833  *
834  * Either the allocated state or the error code encoded into a pointer.
835  */
836 struct drm_private_state *
drm_atomic_get_private_obj_state(struct drm_atomic_state * state,struct drm_private_obj * obj)837 drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
838 				 struct drm_private_obj *obj)
839 {
840 	int index, num_objs, i, ret;
841 	size_t size;
842 	struct __drm_private_objs_state *arr;
843 	struct drm_private_state *obj_state;
844 
845 	for (i = 0; i < state->num_private_objs; i++)
846 		if (obj == state->private_objs[i].ptr)
847 			return state->private_objs[i].state;
848 
849 	ret = drm_modeset_lock(&obj->lock, state->acquire_ctx);
850 	if (ret)
851 		return ERR_PTR(ret);
852 
853 	num_objs = state->num_private_objs + 1;
854 	size = sizeof(*state->private_objs) * num_objs;
855 	arr = krealloc(state->private_objs, size, GFP_KERNEL);
856 	if (!arr)
857 		return ERR_PTR(-ENOMEM);
858 
859 	state->private_objs = arr;
860 	index = state->num_private_objs;
861 	memset(&state->private_objs[index], 0, sizeof(*state->private_objs));
862 
863 	obj_state = obj->funcs->atomic_duplicate_state(obj);
864 	if (!obj_state)
865 		return ERR_PTR(-ENOMEM);
866 
867 	state->private_objs[index].state = obj_state;
868 	state->private_objs[index].old_state = obj->state;
869 	state->private_objs[index].new_state = obj_state;
870 	state->private_objs[index].ptr = obj;
871 	obj_state->state = state;
872 
873 	state->num_private_objs = num_objs;
874 
875 	drm_dbg_atomic(state->dev,
876 		       "Added new private object %p state %p to %p\n",
877 		       obj, obj_state, state);
878 
879 	return obj_state;
880 }
881 EXPORT_SYMBOL(drm_atomic_get_private_obj_state);
882 
883 /**
884  * drm_atomic_get_old_private_obj_state
885  * @state: global atomic state object
886  * @obj: private_obj to grab
887  *
888  * This function returns the old private object state for the given private_obj,
889  * or NULL if the private_obj is not part of the global atomic state.
890  */
891 struct drm_private_state *
drm_atomic_get_old_private_obj_state(const struct drm_atomic_state * state,struct drm_private_obj * obj)892 drm_atomic_get_old_private_obj_state(const struct drm_atomic_state *state,
893 				     struct drm_private_obj *obj)
894 {
895 	int i;
896 
897 	for (i = 0; i < state->num_private_objs; i++)
898 		if (obj == state->private_objs[i].ptr)
899 			return state->private_objs[i].old_state;
900 
901 	return NULL;
902 }
903 EXPORT_SYMBOL(drm_atomic_get_old_private_obj_state);
904 
905 /**
906  * drm_atomic_get_new_private_obj_state
907  * @state: global atomic state object
908  * @obj: private_obj to grab
909  *
910  * This function returns the new private object state for the given private_obj,
911  * or NULL if the private_obj is not part of the global atomic state.
912  */
913 struct drm_private_state *
drm_atomic_get_new_private_obj_state(const struct drm_atomic_state * state,struct drm_private_obj * obj)914 drm_atomic_get_new_private_obj_state(const struct drm_atomic_state *state,
915 				     struct drm_private_obj *obj)
916 {
917 	int i;
918 
919 	for (i = 0; i < state->num_private_objs; i++)
920 		if (obj == state->private_objs[i].ptr)
921 			return state->private_objs[i].new_state;
922 
923 	return NULL;
924 }
925 EXPORT_SYMBOL(drm_atomic_get_new_private_obj_state);
926 
927 /**
928  * drm_atomic_get_old_connector_for_encoder - Get old connector for an encoder
929  * @state: Atomic state
930  * @encoder: The encoder to fetch the connector state for
931  *
932  * This function finds and returns the connector that was connected to @encoder
933  * as specified by the @state.
934  *
935  * If there is no connector in @state which previously had @encoder connected to
936  * it, this function will return NULL. While this may seem like an invalid use
937  * case, it is sometimes useful to differentiate commits which had no prior
938  * connectors attached to @encoder vs ones that did (and to inspect their
939  * state). This is especially true in enable hooks because the pipeline has
940  * changed.
941  *
942  * Returns: The old connector connected to @encoder, or NULL if the encoder is
943  * not connected.
944  */
945 struct drm_connector *
drm_atomic_get_old_connector_for_encoder(const struct drm_atomic_state * state,struct drm_encoder * encoder)946 drm_atomic_get_old_connector_for_encoder(const struct drm_atomic_state *state,
947 					 struct drm_encoder *encoder)
948 {
949 	struct drm_connector_state *conn_state;
950 	struct drm_connector *connector;
951 	unsigned int i;
952 
953 	for_each_old_connector_in_state(state, connector, conn_state, i) {
954 		if (conn_state->best_encoder == encoder)
955 			return connector;
956 	}
957 
958 	return NULL;
959 }
960 EXPORT_SYMBOL(drm_atomic_get_old_connector_for_encoder);
961 
962 /**
963  * drm_atomic_get_new_connector_for_encoder - Get new connector for an encoder
964  * @state: Atomic state
965  * @encoder: The encoder to fetch the connector state for
966  *
967  * This function finds and returns the connector that will be connected to
968  * @encoder as specified by the @state.
969  *
970  * If there is no connector in @state which will have @encoder connected to it,
971  * this function will return NULL. While this may seem like an invalid use case,
972  * it is sometimes useful to differentiate commits which have no connectors
973  * attached to @encoder vs ones that do (and to inspect their state). This is
974  * especially true in disable hooks because the pipeline will change.
975  *
976  * Returns: The new connector connected to @encoder, or NULL if the encoder is
977  * not connected.
978  */
979 struct drm_connector *
drm_atomic_get_new_connector_for_encoder(const struct drm_atomic_state * state,struct drm_encoder * encoder)980 drm_atomic_get_new_connector_for_encoder(const struct drm_atomic_state *state,
981 					 struct drm_encoder *encoder)
982 {
983 	struct drm_connector_state *conn_state;
984 	struct drm_connector *connector;
985 	unsigned int i;
986 
987 	for_each_new_connector_in_state(state, connector, conn_state, i) {
988 		if (conn_state->best_encoder == encoder)
989 			return connector;
990 	}
991 
992 	return NULL;
993 }
994 EXPORT_SYMBOL(drm_atomic_get_new_connector_for_encoder);
995 
996 /**
997  * drm_atomic_get_old_crtc_for_encoder - Get old crtc for an encoder
998  * @state: Atomic state
999  * @encoder: The encoder to fetch the crtc state for
1000  *
1001  * This function finds and returns the crtc that was connected to @encoder
1002  * as specified by the @state.
1003  *
1004  * Returns: The old crtc connected to @encoder, or NULL if the encoder is
1005  * not connected.
1006  */
1007 struct drm_crtc *
drm_atomic_get_old_crtc_for_encoder(struct drm_atomic_state * state,struct drm_encoder * encoder)1008 drm_atomic_get_old_crtc_for_encoder(struct drm_atomic_state *state,
1009 				    struct drm_encoder *encoder)
1010 {
1011 	struct drm_connector *connector;
1012 	struct drm_connector_state *conn_state;
1013 
1014 	connector = drm_atomic_get_old_connector_for_encoder(state, encoder);
1015 	if (!connector)
1016 		return NULL;
1017 
1018 	conn_state = drm_atomic_get_old_connector_state(state, connector);
1019 	if (!conn_state)
1020 		return NULL;
1021 
1022 	return conn_state->crtc;
1023 }
1024 EXPORT_SYMBOL(drm_atomic_get_old_crtc_for_encoder);
1025 
1026 /**
1027  * drm_atomic_get_new_crtc_for_encoder - Get new crtc for an encoder
1028  * @state: Atomic state
1029  * @encoder: The encoder to fetch the crtc state for
1030  *
1031  * This function finds and returns the crtc that will be connected to @encoder
1032  * as specified by the @state.
1033  *
1034  * Returns: The new crtc connected to @encoder, or NULL if the encoder is
1035  * not connected.
1036  */
1037 struct drm_crtc *
drm_atomic_get_new_crtc_for_encoder(struct drm_atomic_state * state,struct drm_encoder * encoder)1038 drm_atomic_get_new_crtc_for_encoder(struct drm_atomic_state *state,
1039 				    struct drm_encoder *encoder)
1040 {
1041 	struct drm_connector *connector;
1042 	struct drm_connector_state *conn_state;
1043 
1044 	connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
1045 	if (!connector)
1046 		return NULL;
1047 
1048 	conn_state = drm_atomic_get_new_connector_state(state, connector);
1049 	if (!conn_state)
1050 		return NULL;
1051 
1052 	return conn_state->crtc;
1053 }
1054 EXPORT_SYMBOL(drm_atomic_get_new_crtc_for_encoder);
1055 
1056 /**
1057  * drm_atomic_get_connector_state - get connector state
1058  * @state: global atomic state object
1059  * @connector: connector to get state object for
1060  *
1061  * This function returns the connector state for the given connector,
1062  * allocating it if needed. It will also grab the relevant connector lock to
1063  * make sure that the state is consistent.
1064  *
1065  * Returns:
1066  *
1067  * Either the allocated state or the error code encoded into the pointer. When
1068  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
1069  * entire atomic sequence must be restarted. All other errors are fatal.
1070  */
1071 struct drm_connector_state *
drm_atomic_get_connector_state(struct drm_atomic_state * state,struct drm_connector * connector)1072 drm_atomic_get_connector_state(struct drm_atomic_state *state,
1073 			  struct drm_connector *connector)
1074 {
1075 	int ret, index;
1076 	struct drm_mode_config *config = &connector->dev->mode_config;
1077 	struct drm_connector_state *connector_state;
1078 
1079 	WARN_ON(!state->acquire_ctx);
1080 
1081 	ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
1082 	if (ret)
1083 		return ERR_PTR(ret);
1084 
1085 	index = drm_connector_index(connector);
1086 
1087 	if (index >= state->num_connector) {
1088 		struct __drm_connnectors_state *c;
1089 		int alloc = max(index + 1, config->num_connector);
1090 
1091 		c = krealloc_array(state->connectors, alloc,
1092 				   sizeof(*state->connectors), GFP_KERNEL);
1093 		if (!c)
1094 			return ERR_PTR(-ENOMEM);
1095 
1096 		state->connectors = c;
1097 		memset(&state->connectors[state->num_connector], 0,
1098 		       sizeof(*state->connectors) * (alloc - state->num_connector));
1099 
1100 		state->num_connector = alloc;
1101 	}
1102 
1103 	if (state->connectors[index].state)
1104 		return state->connectors[index].state;
1105 
1106 	connector_state = connector->funcs->atomic_duplicate_state(connector);
1107 	if (!connector_state)
1108 		return ERR_PTR(-ENOMEM);
1109 
1110 	drm_connector_get(connector);
1111 	state->connectors[index].state = connector_state;
1112 	state->connectors[index].old_state = connector->state;
1113 	state->connectors[index].new_state = connector_state;
1114 	state->connectors[index].ptr = connector;
1115 	connector_state->state = state;
1116 
1117 	drm_dbg_atomic(connector->dev, "Added [CONNECTOR:%d:%s] %p state to %p\n",
1118 			 connector->base.id, connector->name,
1119 			 connector_state, state);
1120 
1121 	if (connector_state->crtc) {
1122 		struct drm_crtc_state *crtc_state;
1123 
1124 		crtc_state = drm_atomic_get_crtc_state(state,
1125 						       connector_state->crtc);
1126 		if (IS_ERR(crtc_state))
1127 			return ERR_CAST(crtc_state);
1128 	}
1129 
1130 	return connector_state;
1131 }
1132 EXPORT_SYMBOL(drm_atomic_get_connector_state);
1133 
drm_atomic_connector_print_state(struct drm_printer * p,const struct drm_connector_state * state)1134 static void drm_atomic_connector_print_state(struct drm_printer *p,
1135 		const struct drm_connector_state *state)
1136 {
1137 	struct drm_connector *connector = state->connector;
1138 
1139 	drm_printf(p, "connector[%u]: %s\n", connector->base.id, connector->name);
1140 	drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
1141 	drm_printf(p, "\tself_refresh_aware=%d\n", state->self_refresh_aware);
1142 	drm_printf(p, "\tmax_requested_bpc=%d\n", state->max_requested_bpc);
1143 	drm_printf(p, "\tcolorspace=%s\n", drm_get_colorspace_name(state->colorspace));
1144 
1145 	if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
1146 		if (state->writeback_job && state->writeback_job->fb)
1147 			drm_printf(p, "\tfb=%d\n", state->writeback_job->fb->base.id);
1148 
1149 	if (connector->funcs->atomic_print_state)
1150 		connector->funcs->atomic_print_state(p, state);
1151 }
1152 
1153 /**
1154  * drm_atomic_get_bridge_state - get bridge state
1155  * @state: global atomic state object
1156  * @bridge: bridge to get state object for
1157  *
1158  * This function returns the bridge state for the given bridge, allocating it
1159  * if needed. It will also grab the relevant bridge lock to make sure that the
1160  * state is consistent.
1161  *
1162  * Returns:
1163  *
1164  * Either the allocated state or the error code encoded into the pointer. When
1165  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
1166  * entire atomic sequence must be restarted.
1167  */
1168 struct drm_bridge_state *
drm_atomic_get_bridge_state(struct drm_atomic_state * state,struct drm_bridge * bridge)1169 drm_atomic_get_bridge_state(struct drm_atomic_state *state,
1170 			    struct drm_bridge *bridge)
1171 {
1172 	struct drm_private_state *obj_state;
1173 
1174 	obj_state = drm_atomic_get_private_obj_state(state, &bridge->base);
1175 	if (IS_ERR(obj_state))
1176 		return ERR_CAST(obj_state);
1177 
1178 	return drm_priv_to_bridge_state(obj_state);
1179 }
1180 EXPORT_SYMBOL(drm_atomic_get_bridge_state);
1181 
1182 /**
1183  * drm_atomic_get_old_bridge_state - get old bridge state, if it exists
1184  * @state: global atomic state object
1185  * @bridge: bridge to grab
1186  *
1187  * This function returns the old bridge state for the given bridge, or NULL if
1188  * the bridge is not part of the global atomic state.
1189  */
1190 struct drm_bridge_state *
drm_atomic_get_old_bridge_state(const struct drm_atomic_state * state,struct drm_bridge * bridge)1191 drm_atomic_get_old_bridge_state(const struct drm_atomic_state *state,
1192 				struct drm_bridge *bridge)
1193 {
1194 	struct drm_private_state *obj_state;
1195 
1196 	obj_state = drm_atomic_get_old_private_obj_state(state, &bridge->base);
1197 	if (!obj_state)
1198 		return NULL;
1199 
1200 	return drm_priv_to_bridge_state(obj_state);
1201 }
1202 EXPORT_SYMBOL(drm_atomic_get_old_bridge_state);
1203 
1204 /**
1205  * drm_atomic_get_new_bridge_state - get new bridge state, if it exists
1206  * @state: global atomic state object
1207  * @bridge: bridge to grab
1208  *
1209  * This function returns the new bridge state for the given bridge, or NULL if
1210  * the bridge is not part of the global atomic state.
1211  */
1212 struct drm_bridge_state *
drm_atomic_get_new_bridge_state(const struct drm_atomic_state * state,struct drm_bridge * bridge)1213 drm_atomic_get_new_bridge_state(const struct drm_atomic_state *state,
1214 				struct drm_bridge *bridge)
1215 {
1216 	struct drm_private_state *obj_state;
1217 
1218 	obj_state = drm_atomic_get_new_private_obj_state(state, &bridge->base);
1219 	if (!obj_state)
1220 		return NULL;
1221 
1222 	return drm_priv_to_bridge_state(obj_state);
1223 }
1224 EXPORT_SYMBOL(drm_atomic_get_new_bridge_state);
1225 
1226 /**
1227  * drm_atomic_add_encoder_bridges - add bridges attached to an encoder
1228  * @state: atomic state
1229  * @encoder: DRM encoder
1230  *
1231  * This function adds all bridges attached to @encoder. This is needed to add
1232  * bridge states to @state and make them available when
1233  * &drm_bridge_funcs.atomic_check(), &drm_bridge_funcs.atomic_pre_enable(),
1234  * &drm_bridge_funcs.atomic_enable(),
1235  * &drm_bridge_funcs.atomic_disable_post_disable() are called.
1236  *
1237  * Returns:
1238  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1239  * then the w/w mutex code has detected a deadlock and the entire atomic
1240  * sequence must be restarted. All other errors are fatal.
1241  */
1242 int
drm_atomic_add_encoder_bridges(struct drm_atomic_state * state,struct drm_encoder * encoder)1243 drm_atomic_add_encoder_bridges(struct drm_atomic_state *state,
1244 			       struct drm_encoder *encoder)
1245 {
1246 	struct drm_bridge_state *bridge_state;
1247 	struct drm_bridge *bridge;
1248 
1249 	if (!encoder)
1250 		return 0;
1251 
1252 	drm_dbg_atomic(encoder->dev,
1253 		       "Adding all bridges for [encoder:%d:%s] to %p\n",
1254 		       encoder->base.id, encoder->name, state);
1255 
1256 	drm_for_each_bridge_in_chain(encoder, bridge) {
1257 		/* Skip bridges that don't implement the atomic state hooks. */
1258 		if (!bridge->funcs->atomic_duplicate_state)
1259 			continue;
1260 
1261 		bridge_state = drm_atomic_get_bridge_state(state, bridge);
1262 		if (IS_ERR(bridge_state))
1263 			return PTR_ERR(bridge_state);
1264 	}
1265 
1266 	return 0;
1267 }
1268 EXPORT_SYMBOL(drm_atomic_add_encoder_bridges);
1269 
1270 /**
1271  * drm_atomic_add_affected_connectors - add connectors for CRTC
1272  * @state: atomic state
1273  * @crtc: DRM CRTC
1274  *
1275  * This function walks the current configuration and adds all connectors
1276  * currently using @crtc to the atomic configuration @state. Note that this
1277  * function must acquire the connection mutex. This can potentially cause
1278  * unneeded serialization if the update is just for the planes on one CRTC. Hence
1279  * drivers and helpers should only call this when really needed (e.g. when a
1280  * full modeset needs to happen due to some change).
1281  *
1282  * Returns:
1283  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1284  * then the w/w mutex code has detected a deadlock and the entire atomic
1285  * sequence must be restarted. All other errors are fatal.
1286  */
1287 int
drm_atomic_add_affected_connectors(struct drm_atomic_state * state,struct drm_crtc * crtc)1288 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
1289 				   struct drm_crtc *crtc)
1290 {
1291 	struct drm_mode_config *config = &state->dev->mode_config;
1292 	struct drm_connector *connector;
1293 	struct drm_connector_state *conn_state;
1294 	struct drm_connector_list_iter conn_iter;
1295 	struct drm_crtc_state *crtc_state;
1296 	int ret;
1297 
1298 	crtc_state = drm_atomic_get_crtc_state(state, crtc);
1299 	if (IS_ERR(crtc_state))
1300 		return PTR_ERR(crtc_state);
1301 
1302 	ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
1303 	if (ret)
1304 		return ret;
1305 
1306 	drm_dbg_atomic(crtc->dev,
1307 		       "Adding all current connectors for [CRTC:%d:%s] to %p\n",
1308 		       crtc->base.id, crtc->name, state);
1309 
1310 	/*
1311 	 * Changed connectors are already in @state, so only need to look
1312 	 * at the connector_mask in crtc_state.
1313 	 */
1314 	drm_connector_list_iter_begin(state->dev, &conn_iter);
1315 	drm_for_each_connector_iter(connector, &conn_iter) {
1316 		if (!(crtc_state->connector_mask & drm_connector_mask(connector)))
1317 			continue;
1318 
1319 		conn_state = drm_atomic_get_connector_state(state, connector);
1320 		if (IS_ERR(conn_state)) {
1321 			drm_connector_list_iter_end(&conn_iter);
1322 			return PTR_ERR(conn_state);
1323 		}
1324 	}
1325 	drm_connector_list_iter_end(&conn_iter);
1326 
1327 	return 0;
1328 }
1329 EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
1330 
1331 /**
1332  * drm_atomic_add_affected_planes - add planes for CRTC
1333  * @state: atomic state
1334  * @crtc: DRM CRTC
1335  *
1336  * This function walks the current configuration and adds all planes
1337  * currently used by @crtc to the atomic configuration @state. This is useful
1338  * when an atomic commit also needs to check all currently enabled plane on
1339  * @crtc, e.g. when changing the mode. It's also useful when re-enabling a CRTC
1340  * to avoid special code to force-enable all planes.
1341  *
1342  * Since acquiring a plane state will always also acquire the w/w mutex of the
1343  * current CRTC for that plane (if there is any) adding all the plane states for
1344  * a CRTC will not reduce parallelism of atomic updates.
1345  *
1346  * Returns:
1347  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1348  * then the w/w mutex code has detected a deadlock and the entire atomic
1349  * sequence must be restarted. All other errors are fatal.
1350  */
1351 int
drm_atomic_add_affected_planes(struct drm_atomic_state * state,struct drm_crtc * crtc)1352 drm_atomic_add_affected_planes(struct drm_atomic_state *state,
1353 			       struct drm_crtc *crtc)
1354 {
1355 	const struct drm_crtc_state *old_crtc_state =
1356 		drm_atomic_get_old_crtc_state(state, crtc);
1357 	struct drm_plane *plane;
1358 
1359 	WARN_ON(!drm_atomic_get_new_crtc_state(state, crtc));
1360 
1361 	drm_dbg_atomic(crtc->dev,
1362 		       "Adding all current planes for [CRTC:%d:%s] to %p\n",
1363 		       crtc->base.id, crtc->name, state);
1364 
1365 	drm_for_each_plane_mask(plane, state->dev, old_crtc_state->plane_mask) {
1366 		struct drm_plane_state *plane_state =
1367 			drm_atomic_get_plane_state(state, plane);
1368 
1369 		if (IS_ERR(plane_state))
1370 			return PTR_ERR(plane_state);
1371 	}
1372 	return 0;
1373 }
1374 EXPORT_SYMBOL(drm_atomic_add_affected_planes);
1375 
1376 /**
1377  * drm_atomic_check_only - check whether a given config would work
1378  * @state: atomic configuration to check
1379  *
1380  * Note that this function can return -EDEADLK if the driver needed to acquire
1381  * more locks but encountered a deadlock. The caller must then do the usual w/w
1382  * backoff dance and restart. All other errors are fatal.
1383  *
1384  * Returns:
1385  * 0 on success, negative error code on failure.
1386  */
drm_atomic_check_only(struct drm_atomic_state * state)1387 int drm_atomic_check_only(struct drm_atomic_state *state)
1388 {
1389 	struct drm_device *dev = state->dev;
1390 	struct drm_mode_config *config = &dev->mode_config;
1391 	struct drm_plane *plane;
1392 	struct drm_plane_state *old_plane_state;
1393 	struct drm_plane_state *new_plane_state;
1394 	struct drm_crtc *crtc;
1395 	struct drm_crtc_state *old_crtc_state;
1396 	struct drm_crtc_state *new_crtc_state;
1397 	struct drm_connector *conn;
1398 	struct drm_connector_state *conn_state;
1399 	unsigned int requested_crtc = 0;
1400 	unsigned int affected_crtc = 0;
1401 	int i, ret = 0;
1402 
1403 	drm_dbg_atomic(dev, "checking %p\n", state);
1404 
1405 	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1406 		if (new_crtc_state->enable)
1407 			requested_crtc |= drm_crtc_mask(crtc);
1408 	}
1409 
1410 	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
1411 		ret = drm_atomic_plane_check(old_plane_state, new_plane_state);
1412 		if (ret) {
1413 			drm_dbg_atomic(dev, "[PLANE:%d:%s] atomic core check failed\n",
1414 				       plane->base.id, plane->name);
1415 			return ret;
1416 		}
1417 	}
1418 
1419 	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
1420 		ret = drm_atomic_crtc_check(old_crtc_state, new_crtc_state);
1421 		if (ret) {
1422 			drm_dbg_atomic(dev, "[CRTC:%d:%s] atomic core check failed\n",
1423 				       crtc->base.id, crtc->name);
1424 			return ret;
1425 		}
1426 	}
1427 
1428 	for_each_new_connector_in_state(state, conn, conn_state, i) {
1429 		ret = drm_atomic_connector_check(conn, conn_state);
1430 		if (ret) {
1431 			drm_dbg_atomic(dev, "[CONNECTOR:%d:%s] atomic core check failed\n",
1432 				       conn->base.id, conn->name);
1433 			return ret;
1434 		}
1435 	}
1436 
1437 	if (config->funcs->atomic_check) {
1438 		ret = config->funcs->atomic_check(state->dev, state);
1439 
1440 		if (ret) {
1441 			drm_dbg_atomic(dev, "atomic driver check for %p failed: %d\n",
1442 				       state, ret);
1443 			return ret;
1444 		}
1445 	}
1446 
1447 	if (!state->allow_modeset) {
1448 		for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1449 			if (drm_atomic_crtc_needs_modeset(new_crtc_state)) {
1450 				drm_dbg_atomic(dev, "[CRTC:%d:%s] requires full modeset\n",
1451 					       crtc->base.id, crtc->name);
1452 				return -EINVAL;
1453 			}
1454 		}
1455 	}
1456 
1457 	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1458 		if (new_crtc_state->enable)
1459 			affected_crtc |= drm_crtc_mask(crtc);
1460 	}
1461 
1462 	/*
1463 	 * For commits that allow modesets drivers can add other CRTCs to the
1464 	 * atomic commit, e.g. when they need to reallocate global resources.
1465 	 * This can cause spurious EBUSY, which robs compositors of a very
1466 	 * effective sanity check for their drawing loop. Therefor only allow
1467 	 * drivers to add unrelated CRTC states for modeset commits.
1468 	 *
1469 	 * FIXME: Should add affected_crtc mask to the ATOMIC IOCTL as an output
1470 	 * so compositors know what's going on.
1471 	 */
1472 	if (affected_crtc != requested_crtc) {
1473 		drm_dbg_atomic(dev,
1474 			       "driver added CRTC to commit: requested 0x%x, affected 0x%0x\n",
1475 			       requested_crtc, affected_crtc);
1476 		WARN(!state->allow_modeset, "adding CRTC not allowed without modesets: requested 0x%x, affected 0x%0x\n",
1477 		     requested_crtc, affected_crtc);
1478 	}
1479 
1480 	return 0;
1481 }
1482 EXPORT_SYMBOL(drm_atomic_check_only);
1483 
1484 /**
1485  * drm_atomic_commit - commit configuration atomically
1486  * @state: atomic configuration to check
1487  *
1488  * Note that this function can return -EDEADLK if the driver needed to acquire
1489  * more locks but encountered a deadlock. The caller must then do the usual w/w
1490  * backoff dance and restart. All other errors are fatal.
1491  *
1492  * This function will take its own reference on @state.
1493  * Callers should always release their reference with drm_atomic_state_put().
1494  *
1495  * Returns:
1496  * 0 on success, negative error code on failure.
1497  */
drm_atomic_commit(struct drm_atomic_state * state)1498 int drm_atomic_commit(struct drm_atomic_state *state)
1499 {
1500 	struct drm_mode_config *config = &state->dev->mode_config;
1501 	struct drm_printer p = drm_info_printer(state->dev->dev);
1502 	int ret;
1503 
1504 	if (drm_debug_enabled(DRM_UT_STATE))
1505 		drm_atomic_print_new_state(state, &p);
1506 
1507 	ret = drm_atomic_check_only(state);
1508 	if (ret)
1509 		return ret;
1510 
1511 	drm_dbg_atomic(state->dev, "committing %p\n", state);
1512 
1513 	return config->funcs->atomic_commit(state->dev, state, false);
1514 }
1515 EXPORT_SYMBOL(drm_atomic_commit);
1516 
1517 /**
1518  * drm_atomic_nonblocking_commit - atomic nonblocking commit
1519  * @state: atomic configuration to check
1520  *
1521  * Note that this function can return -EDEADLK if the driver needed to acquire
1522  * more locks but encountered a deadlock. The caller must then do the usual w/w
1523  * backoff dance and restart. All other errors are fatal.
1524  *
1525  * This function will take its own reference on @state.
1526  * Callers should always release their reference with drm_atomic_state_put().
1527  *
1528  * Returns:
1529  * 0 on success, negative error code on failure.
1530  */
drm_atomic_nonblocking_commit(struct drm_atomic_state * state)1531 int drm_atomic_nonblocking_commit(struct drm_atomic_state *state)
1532 {
1533 	struct drm_mode_config *config = &state->dev->mode_config;
1534 	int ret;
1535 
1536 	ret = drm_atomic_check_only(state);
1537 	if (ret)
1538 		return ret;
1539 
1540 	drm_dbg_atomic(state->dev, "committing %p nonblocking\n", state);
1541 
1542 	return config->funcs->atomic_commit(state->dev, state, true);
1543 }
1544 EXPORT_SYMBOL(drm_atomic_nonblocking_commit);
1545 
1546 /* just used from drm-client and atomic-helper: */
__drm_atomic_helper_disable_plane(struct drm_plane * plane,struct drm_plane_state * plane_state)1547 int __drm_atomic_helper_disable_plane(struct drm_plane *plane,
1548 				      struct drm_plane_state *plane_state)
1549 {
1550 	int ret;
1551 
1552 	ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
1553 	if (ret != 0)
1554 		return ret;
1555 
1556 	drm_atomic_set_fb_for_plane(plane_state, NULL);
1557 	plane_state->crtc_x = 0;
1558 	plane_state->crtc_y = 0;
1559 	plane_state->crtc_w = 0;
1560 	plane_state->crtc_h = 0;
1561 	plane_state->src_x = 0;
1562 	plane_state->src_y = 0;
1563 	plane_state->src_w = 0;
1564 	plane_state->src_h = 0;
1565 
1566 	return 0;
1567 }
1568 EXPORT_SYMBOL(__drm_atomic_helper_disable_plane);
1569 
update_output_state(struct drm_atomic_state * state,struct drm_mode_set * set)1570 static int update_output_state(struct drm_atomic_state *state,
1571 			       struct drm_mode_set *set)
1572 {
1573 	struct drm_device *dev = set->crtc->dev;
1574 	struct drm_crtc *crtc;
1575 	struct drm_crtc_state *new_crtc_state;
1576 	struct drm_connector *connector;
1577 	struct drm_connector_state *new_conn_state;
1578 	int ret, i;
1579 
1580 	ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
1581 			       state->acquire_ctx);
1582 	if (ret)
1583 		return ret;
1584 
1585 	/* First disable all connectors on the target crtc. */
1586 	ret = drm_atomic_add_affected_connectors(state, set->crtc);
1587 	if (ret)
1588 		return ret;
1589 
1590 	for_each_new_connector_in_state(state, connector, new_conn_state, i) {
1591 		if (new_conn_state->crtc == set->crtc) {
1592 			ret = drm_atomic_set_crtc_for_connector(new_conn_state,
1593 								NULL);
1594 			if (ret)
1595 				return ret;
1596 
1597 			/* Make sure legacy setCrtc always re-trains */
1598 			new_conn_state->link_status = DRM_LINK_STATUS_GOOD;
1599 		}
1600 	}
1601 
1602 	/* Then set all connectors from set->connectors on the target crtc */
1603 	for (i = 0; i < set->num_connectors; i++) {
1604 		new_conn_state = drm_atomic_get_connector_state(state,
1605 								set->connectors[i]);
1606 		if (IS_ERR(new_conn_state))
1607 			return PTR_ERR(new_conn_state);
1608 
1609 		ret = drm_atomic_set_crtc_for_connector(new_conn_state,
1610 							set->crtc);
1611 		if (ret)
1612 			return ret;
1613 	}
1614 
1615 	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1616 		/*
1617 		 * Don't update ->enable for the CRTC in the set_config request,
1618 		 * since a mismatch would indicate a bug in the upper layers.
1619 		 * The actual modeset code later on will catch any
1620 		 * inconsistencies here.
1621 		 */
1622 		if (crtc == set->crtc)
1623 			continue;
1624 
1625 		if (!new_crtc_state->connector_mask) {
1626 			ret = drm_atomic_set_mode_prop_for_crtc(new_crtc_state,
1627 								NULL);
1628 			if (ret < 0)
1629 				return ret;
1630 
1631 			new_crtc_state->active = false;
1632 		}
1633 	}
1634 
1635 	return 0;
1636 }
1637 
1638 /* just used from drm-client and atomic-helper: */
__drm_atomic_helper_set_config(struct drm_mode_set * set,struct drm_atomic_state * state)1639 int __drm_atomic_helper_set_config(struct drm_mode_set *set,
1640 				   struct drm_atomic_state *state)
1641 {
1642 	struct drm_crtc_state *crtc_state;
1643 	struct drm_plane_state *primary_state;
1644 	struct drm_crtc *crtc = set->crtc;
1645 	int hdisplay, vdisplay;
1646 	int ret;
1647 
1648 	crtc_state = drm_atomic_get_crtc_state(state, crtc);
1649 	if (IS_ERR(crtc_state))
1650 		return PTR_ERR(crtc_state);
1651 
1652 	primary_state = drm_atomic_get_plane_state(state, crtc->primary);
1653 	if (IS_ERR(primary_state))
1654 		return PTR_ERR(primary_state);
1655 
1656 	if (!set->mode) {
1657 		WARN_ON(set->fb);
1658 		WARN_ON(set->num_connectors);
1659 
1660 		ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
1661 		if (ret != 0)
1662 			return ret;
1663 
1664 		crtc_state->active = false;
1665 
1666 		ret = drm_atomic_set_crtc_for_plane(primary_state, NULL);
1667 		if (ret != 0)
1668 			return ret;
1669 
1670 		drm_atomic_set_fb_for_plane(primary_state, NULL);
1671 
1672 		goto commit;
1673 	}
1674 
1675 	WARN_ON(!set->fb);
1676 	WARN_ON(!set->num_connectors);
1677 
1678 	ret = drm_atomic_set_mode_for_crtc(crtc_state, set->mode);
1679 	if (ret != 0)
1680 		return ret;
1681 
1682 	crtc_state->active = true;
1683 
1684 	ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
1685 	if (ret != 0)
1686 		return ret;
1687 
1688 	drm_mode_get_hv_timing(set->mode, &hdisplay, &vdisplay);
1689 
1690 	drm_atomic_set_fb_for_plane(primary_state, set->fb);
1691 	primary_state->crtc_x = 0;
1692 	primary_state->crtc_y = 0;
1693 	primary_state->crtc_w = hdisplay;
1694 	primary_state->crtc_h = vdisplay;
1695 	primary_state->src_x = set->x << 16;
1696 	primary_state->src_y = set->y << 16;
1697 	if (drm_rotation_90_or_270(primary_state->rotation)) {
1698 		primary_state->src_w = vdisplay << 16;
1699 		primary_state->src_h = hdisplay << 16;
1700 	} else {
1701 		primary_state->src_w = hdisplay << 16;
1702 		primary_state->src_h = vdisplay << 16;
1703 	}
1704 
1705 commit:
1706 	ret = update_output_state(state, set);
1707 	if (ret)
1708 		return ret;
1709 
1710 	return 0;
1711 }
1712 EXPORT_SYMBOL(__drm_atomic_helper_set_config);
1713 
drm_atomic_private_obj_print_state(struct drm_printer * p,const struct drm_private_state * state)1714 static void drm_atomic_private_obj_print_state(struct drm_printer *p,
1715 					       const struct drm_private_state *state)
1716 {
1717 	struct drm_private_obj *obj = state->obj;
1718 
1719 	if (obj->funcs->atomic_print_state)
1720 		obj->funcs->atomic_print_state(p, state);
1721 }
1722 
1723 /**
1724  * drm_atomic_print_new_state - prints drm atomic state
1725  * @state: atomic configuration to check
1726  * @p: drm printer
1727  *
1728  * This functions prints the drm atomic state snapshot using the drm printer
1729  * which is passed to it. This snapshot can be used for debugging purposes.
1730  *
1731  * Note that this function looks into the new state objects and hence its not
1732  * safe to be used after the call to drm_atomic_helper_commit_hw_done().
1733  */
drm_atomic_print_new_state(const struct drm_atomic_state * state,struct drm_printer * p)1734 void drm_atomic_print_new_state(const struct drm_atomic_state *state,
1735 		struct drm_printer *p)
1736 {
1737 	struct drm_plane *plane;
1738 	struct drm_plane_state *plane_state;
1739 	struct drm_crtc *crtc;
1740 	struct drm_crtc_state *crtc_state;
1741 	struct drm_connector *connector;
1742 	struct drm_connector_state *connector_state;
1743 	struct drm_private_obj *obj;
1744 	struct drm_private_state *obj_state;
1745 	int i;
1746 
1747 	if (!p) {
1748 		drm_err(state->dev, "invalid drm printer\n");
1749 		return;
1750 	}
1751 
1752 	drm_dbg_atomic(state->dev, "checking %p\n", state);
1753 
1754 	for_each_new_plane_in_state(state, plane, plane_state, i)
1755 		drm_atomic_plane_print_state(p, plane_state);
1756 
1757 	for_each_new_crtc_in_state(state, crtc, crtc_state, i)
1758 		drm_atomic_crtc_print_state(p, crtc_state);
1759 
1760 	for_each_new_connector_in_state(state, connector, connector_state, i)
1761 		drm_atomic_connector_print_state(p, connector_state);
1762 
1763 	for_each_new_private_obj_in_state(state, obj, obj_state, i)
1764 		drm_atomic_private_obj_print_state(p, obj_state);
1765 }
1766 EXPORT_SYMBOL(drm_atomic_print_new_state);
1767 
__drm_state_dump(struct drm_device * dev,struct drm_printer * p,bool take_locks)1768 static void __drm_state_dump(struct drm_device *dev, struct drm_printer *p,
1769 			     bool take_locks)
1770 {
1771 	struct drm_mode_config *config = &dev->mode_config;
1772 	struct drm_plane *plane;
1773 	struct drm_crtc *crtc;
1774 	struct drm_connector *connector;
1775 	struct drm_connector_list_iter conn_iter;
1776 
1777 	if (!drm_drv_uses_atomic_modeset(dev))
1778 		return;
1779 
1780 	list_for_each_entry(plane, &config->plane_list, head) {
1781 		if (take_locks)
1782 			drm_modeset_lock(&plane->mutex, NULL);
1783 		drm_atomic_plane_print_state(p, plane->state);
1784 		if (take_locks)
1785 			drm_modeset_unlock(&plane->mutex);
1786 	}
1787 
1788 	list_for_each_entry(crtc, &config->crtc_list, head) {
1789 		if (take_locks)
1790 			drm_modeset_lock(&crtc->mutex, NULL);
1791 		drm_atomic_crtc_print_state(p, crtc->state);
1792 		if (take_locks)
1793 			drm_modeset_unlock(&crtc->mutex);
1794 	}
1795 
1796 	drm_connector_list_iter_begin(dev, &conn_iter);
1797 	if (take_locks)
1798 		drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1799 	drm_for_each_connector_iter(connector, &conn_iter)
1800 		drm_atomic_connector_print_state(p, connector->state);
1801 	if (take_locks)
1802 		drm_modeset_unlock(&dev->mode_config.connection_mutex);
1803 	drm_connector_list_iter_end(&conn_iter);
1804 }
1805 
1806 /**
1807  * drm_state_dump - dump entire device atomic state
1808  * @dev: the drm device
1809  * @p: where to print the state to
1810  *
1811  * Just for debugging.  Drivers might want an option to dump state
1812  * to dmesg in case of error irq's.  (Hint, you probably want to
1813  * ratelimit this!)
1814  *
1815  * The caller must wrap this drm_modeset_lock_all_ctx() and
1816  * drm_modeset_drop_locks(). If this is called from error irq handler, it should
1817  * not be enabled by default - if you are debugging errors you might
1818  * not care that this is racey, but calling this without all modeset locks held
1819  * is inherently unsafe.
1820  */
drm_state_dump(struct drm_device * dev,struct drm_printer * p)1821 void drm_state_dump(struct drm_device *dev, struct drm_printer *p)
1822 {
1823 	__drm_state_dump(dev, p, false);
1824 }
1825 EXPORT_SYMBOL(drm_state_dump);
1826 
1827 #ifdef CONFIG_DEBUG_FS
drm_state_info(struct seq_file * m,void * data)1828 static int drm_state_info(struct seq_file *m, void *data)
1829 {
1830 	struct drm_debugfs_entry *entry = m->private;
1831 	struct drm_device *dev = entry->dev;
1832 	struct drm_printer p = drm_seq_file_printer(m);
1833 
1834 	__drm_state_dump(dev, &p, true);
1835 
1836 	return 0;
1837 }
1838 
1839 /* any use in debugfs files to dump individual planes/crtc/etc? */
1840 static const struct drm_debugfs_info drm_atomic_debugfs_list[] = {
1841 	{"state", drm_state_info, 0},
1842 };
1843 
drm_atomic_debugfs_init(struct drm_minor * minor)1844 void drm_atomic_debugfs_init(struct drm_minor *minor)
1845 {
1846 	drm_debugfs_add_files(minor->dev, drm_atomic_debugfs_list,
1847 			      ARRAY_SIZE(drm_atomic_debugfs_list));
1848 }
1849 #endif
1850