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