1 /*
2  * Copyright (c) 2016 Intel Corporation
3  *
4  * Permission to use, copy, modify, distribute, and sell this software and its
5  * documentation for any purpose is hereby granted without fee, provided that
6  * the above copyright notice appear in all copies and that both that copyright
7  * notice and this permission notice appear in supporting documentation, and
8  * that the name of the copyright holders not be used in advertising or
9  * publicity pertaining to distribution of the software without specific,
10  * written prior permission.  The copyright holders make no representations
11  * about the suitability of this software for any purpose.  It is provided "as
12  * is" without express or implied warranty.
13  *
14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20  * OF THIS SOFTWARE.
21  */
22 
23 #include <linux/uaccess.h>
24 
25 #include <drm/drm_drv.h>
26 #include <drm/drm_encoder.h>
27 #include <drm/drm_file.h>
28 #include <drm/drm_framebuffer.h>
29 #include <drm/drm_managed.h>
30 #include <drm/drm_mode_config.h>
31 #include <drm/drm_print.h>
32 #include <linux/dma-resv.h>
33 
34 #include "drm_crtc_internal.h"
35 #include "drm_internal.h"
36 
drm_modeset_register_all(struct drm_device * dev)37 int drm_modeset_register_all(struct drm_device *dev)
38 {
39 	int ret;
40 
41 	ret = drm_plane_register_all(dev);
42 	if (ret)
43 		goto err_plane;
44 
45 	ret = drm_crtc_register_all(dev);
46 	if  (ret)
47 		goto err_crtc;
48 
49 	ret = drm_encoder_register_all(dev);
50 	if (ret)
51 		goto err_encoder;
52 
53 	ret = drm_connector_register_all(dev);
54 	if (ret)
55 		goto err_connector;
56 
57 	drm_debugfs_late_register(dev);
58 
59 	return 0;
60 
61 err_connector:
62 	drm_encoder_unregister_all(dev);
63 err_encoder:
64 	drm_crtc_unregister_all(dev);
65 err_crtc:
66 	drm_plane_unregister_all(dev);
67 err_plane:
68 	return ret;
69 }
70 
drm_modeset_unregister_all(struct drm_device * dev)71 void drm_modeset_unregister_all(struct drm_device *dev)
72 {
73 	drm_connector_unregister_all(dev);
74 	drm_encoder_unregister_all(dev);
75 	drm_crtc_unregister_all(dev);
76 	drm_plane_unregister_all(dev);
77 }
78 
79 /**
80  * drm_mode_getresources - get graphics configuration
81  * @dev: drm device for the ioctl
82  * @data: data pointer for the ioctl
83  * @file_priv: drm file for the ioctl call
84  *
85  * Construct a set of configuration description structures and return
86  * them to the user, including CRTC, connector and framebuffer configuration.
87  *
88  * Called by the user via ioctl.
89  *
90  * Returns:
91  * Zero on success, negative errno on failure.
92  */
drm_mode_getresources(struct drm_device * dev,void * data,struct drm_file * file_priv)93 int drm_mode_getresources(struct drm_device *dev, void *data,
94 			  struct drm_file *file_priv)
95 {
96 	struct drm_mode_card_res *card_res = data;
97 	struct drm_framebuffer *fb;
98 	struct drm_connector *connector;
99 	struct drm_crtc *crtc;
100 	struct drm_encoder *encoder;
101 	int count, ret = 0;
102 	uint32_t __user *fb_id;
103 	uint32_t __user *crtc_id;
104 	uint32_t __user *connector_id;
105 	uint32_t __user *encoder_id;
106 	struct drm_connector_list_iter conn_iter;
107 
108 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
109 		return -EOPNOTSUPP;
110 
111 	mutex_lock(&file_priv->fbs_lock);
112 	count = 0;
113 	fb_id = u64_to_user_ptr(card_res->fb_id_ptr);
114 	list_for_each_entry(fb, &file_priv->fbs, filp_head) {
115 		if (count < card_res->count_fbs &&
116 		    put_user(fb->base.id, fb_id + count)) {
117 			mutex_unlock(&file_priv->fbs_lock);
118 			return -EFAULT;
119 		}
120 		count++;
121 	}
122 	card_res->count_fbs = count;
123 	mutex_unlock(&file_priv->fbs_lock);
124 
125 	card_res->max_height = dev->mode_config.max_height;
126 	card_res->min_height = dev->mode_config.min_height;
127 	card_res->max_width = dev->mode_config.max_width;
128 	card_res->min_width = dev->mode_config.min_width;
129 
130 	count = 0;
131 	crtc_id = u64_to_user_ptr(card_res->crtc_id_ptr);
132 	drm_for_each_crtc(crtc, dev) {
133 		if (drm_lease_held(file_priv, crtc->base.id)) {
134 			if (count < card_res->count_crtcs &&
135 			    put_user(crtc->base.id, crtc_id + count))
136 				return -EFAULT;
137 			count++;
138 		}
139 	}
140 	card_res->count_crtcs = count;
141 
142 	count = 0;
143 	encoder_id = u64_to_user_ptr(card_res->encoder_id_ptr);
144 	drm_for_each_encoder(encoder, dev) {
145 		if (count < card_res->count_encoders &&
146 		    put_user(encoder->base.id, encoder_id + count))
147 			return -EFAULT;
148 		count++;
149 	}
150 	card_res->count_encoders = count;
151 
152 	drm_connector_list_iter_begin(dev, &conn_iter);
153 	count = 0;
154 	connector_id = u64_to_user_ptr(card_res->connector_id_ptr);
155 	drm_for_each_connector_iter(connector, &conn_iter) {
156 		/* only expose writeback connectors if userspace understands them */
157 		if (!file_priv->writeback_connectors &&
158 		    (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK))
159 			continue;
160 
161 		if (drm_lease_held(file_priv, connector->base.id)) {
162 			if (count < card_res->count_connectors &&
163 			    put_user(connector->base.id, connector_id + count)) {
164 				drm_connector_list_iter_end(&conn_iter);
165 				return -EFAULT;
166 			}
167 			count++;
168 		}
169 	}
170 	card_res->count_connectors = count;
171 	drm_connector_list_iter_end(&conn_iter);
172 
173 	return ret;
174 }
175 
176 /**
177  * drm_mode_config_reset - call ->reset callbacks
178  * @dev: drm device
179  *
180  * This functions calls all the crtc's, encoder's and connector's ->reset
181  * callback. Drivers can use this in e.g. their driver load or resume code to
182  * reset hardware and software state.
183  */
drm_mode_config_reset(struct drm_device * dev)184 void drm_mode_config_reset(struct drm_device *dev)
185 {
186 	struct drm_crtc *crtc;
187 	struct drm_plane *plane;
188 	struct drm_encoder *encoder;
189 	struct drm_connector *connector;
190 	struct drm_connector_list_iter conn_iter;
191 
192 	drm_for_each_plane(plane, dev)
193 		if (plane->funcs->reset)
194 			plane->funcs->reset(plane);
195 
196 	drm_for_each_crtc(crtc, dev)
197 		if (crtc->funcs->reset)
198 			crtc->funcs->reset(crtc);
199 
200 	drm_for_each_encoder(encoder, dev)
201 		if (encoder->funcs && encoder->funcs->reset)
202 			encoder->funcs->reset(encoder);
203 
204 	drm_connector_list_iter_begin(dev, &conn_iter);
205 	drm_for_each_connector_iter(connector, &conn_iter)
206 		if (connector->funcs->reset)
207 			connector->funcs->reset(connector);
208 	drm_connector_list_iter_end(&conn_iter);
209 }
210 EXPORT_SYMBOL(drm_mode_config_reset);
211 
212 /*
213  * Global properties
214  */
215 static const struct drm_prop_enum_list drm_plane_type_enum_list[] = {
216 	{ DRM_PLANE_TYPE_OVERLAY, "Overlay" },
217 	{ DRM_PLANE_TYPE_PRIMARY, "Primary" },
218 	{ DRM_PLANE_TYPE_CURSOR, "Cursor" },
219 };
220 
drm_mode_create_standard_properties(struct drm_device * dev)221 static int drm_mode_create_standard_properties(struct drm_device *dev)
222 {
223 	struct drm_property *prop;
224 	int ret;
225 
226 	ret = drm_connector_create_standard_properties(dev);
227 	if (ret)
228 		return ret;
229 
230 	prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
231 					"type", drm_plane_type_enum_list,
232 					ARRAY_SIZE(drm_plane_type_enum_list));
233 	if (!prop)
234 		return -ENOMEM;
235 	dev->mode_config.plane_type_property = prop;
236 
237 	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
238 			"SRC_X", 0, UINT_MAX);
239 	if (!prop)
240 		return -ENOMEM;
241 	dev->mode_config.prop_src_x = prop;
242 
243 	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
244 			"SRC_Y", 0, UINT_MAX);
245 	if (!prop)
246 		return -ENOMEM;
247 	dev->mode_config.prop_src_y = prop;
248 
249 	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
250 			"SRC_W", 0, UINT_MAX);
251 	if (!prop)
252 		return -ENOMEM;
253 	dev->mode_config.prop_src_w = prop;
254 
255 	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
256 			"SRC_H", 0, UINT_MAX);
257 	if (!prop)
258 		return -ENOMEM;
259 	dev->mode_config.prop_src_h = prop;
260 
261 	prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
262 			"CRTC_X", INT_MIN, INT_MAX);
263 	if (!prop)
264 		return -ENOMEM;
265 	dev->mode_config.prop_crtc_x = prop;
266 
267 	prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
268 			"CRTC_Y", INT_MIN, INT_MAX);
269 	if (!prop)
270 		return -ENOMEM;
271 	dev->mode_config.prop_crtc_y = prop;
272 
273 	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
274 			"CRTC_W", 0, INT_MAX);
275 	if (!prop)
276 		return -ENOMEM;
277 	dev->mode_config.prop_crtc_w = prop;
278 
279 	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
280 			"CRTC_H", 0, INT_MAX);
281 	if (!prop)
282 		return -ENOMEM;
283 	dev->mode_config.prop_crtc_h = prop;
284 
285 	prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
286 			"FB_ID", DRM_MODE_OBJECT_FB);
287 	if (!prop)
288 		return -ENOMEM;
289 	dev->mode_config.prop_fb_id = prop;
290 
291 	prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
292 			"IN_FENCE_FD", -1, INT_MAX);
293 	if (!prop)
294 		return -ENOMEM;
295 	dev->mode_config.prop_in_fence_fd = prop;
296 
297 	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
298 			"OUT_FENCE_PTR", 0, U64_MAX);
299 	if (!prop)
300 		return -ENOMEM;
301 	dev->mode_config.prop_out_fence_ptr = prop;
302 
303 	prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
304 			"CRTC_ID", DRM_MODE_OBJECT_CRTC);
305 	if (!prop)
306 		return -ENOMEM;
307 	dev->mode_config.prop_crtc_id = prop;
308 
309 	prop = drm_property_create(dev,
310 			DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
311 			"FB_DAMAGE_CLIPS", 0);
312 	if (!prop)
313 		return -ENOMEM;
314 	dev->mode_config.prop_fb_damage_clips = prop;
315 
316 	prop = drm_property_create_bool(dev, DRM_MODE_PROP_ATOMIC,
317 			"ACTIVE");
318 	if (!prop)
319 		return -ENOMEM;
320 	dev->mode_config.prop_active = prop;
321 
322 	prop = drm_property_create(dev,
323 			DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
324 			"MODE_ID", 0);
325 	if (!prop)
326 		return -ENOMEM;
327 	dev->mode_config.prop_mode_id = prop;
328 
329 	prop = drm_property_create_bool(dev, 0,
330 			"VRR_ENABLED");
331 	if (!prop)
332 		return -ENOMEM;
333 	dev->mode_config.prop_vrr_enabled = prop;
334 
335 	prop = drm_property_create(dev,
336 			DRM_MODE_PROP_BLOB,
337 			"DEGAMMA_LUT", 0);
338 	if (!prop)
339 		return -ENOMEM;
340 	dev->mode_config.degamma_lut_property = prop;
341 
342 	prop = drm_property_create_range(dev,
343 			DRM_MODE_PROP_IMMUTABLE,
344 			"DEGAMMA_LUT_SIZE", 0, UINT_MAX);
345 	if (!prop)
346 		return -ENOMEM;
347 	dev->mode_config.degamma_lut_size_property = prop;
348 
349 	prop = drm_property_create(dev,
350 			DRM_MODE_PROP_BLOB,
351 			"CTM", 0);
352 	if (!prop)
353 		return -ENOMEM;
354 	dev->mode_config.ctm_property = prop;
355 
356 	prop = drm_property_create(dev,
357 			DRM_MODE_PROP_BLOB,
358 			"GAMMA_LUT", 0);
359 	if (!prop)
360 		return -ENOMEM;
361 	dev->mode_config.gamma_lut_property = prop;
362 
363 	prop = drm_property_create_range(dev,
364 			DRM_MODE_PROP_IMMUTABLE,
365 			"GAMMA_LUT_SIZE", 0, UINT_MAX);
366 	if (!prop)
367 		return -ENOMEM;
368 	dev->mode_config.gamma_lut_size_property = prop;
369 
370 	prop = drm_property_create(dev,
371 				   DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_BLOB,
372 				   "IN_FORMATS", 0);
373 	if (!prop)
374 		return -ENOMEM;
375 	dev->mode_config.modifiers_property = prop;
376 
377 	return 0;
378 }
379 
drm_mode_config_init_release(struct drm_device * dev,void * ptr)380 static void drm_mode_config_init_release(struct drm_device *dev, void *ptr)
381 {
382 	drm_mode_config_cleanup(dev);
383 }
384 
385 /**
386  * drmm_mode_config_init - managed DRM mode_configuration structure
387  * 	initialization
388  * @dev: DRM device
389  *
390  * Initialize @dev's mode_config structure, used for tracking the graphics
391  * configuration of @dev.
392  *
393  * Since this initializes the modeset locks, no locking is possible. Which is no
394  * problem, since this should happen single threaded at init time. It is the
395  * driver's problem to ensure this guarantee.
396  *
397  * Cleanup is automatically handled through registering drm_mode_config_cleanup
398  * with drmm_add_action().
399  *
400  * Returns: 0 on success, negative error value on failure.
401  */
drmm_mode_config_init(struct drm_device * dev)402 int drmm_mode_config_init(struct drm_device *dev)
403 {
404 	int ret;
405 
406 	mutex_init(&dev->mode_config.mutex);
407 	drm_modeset_lock_init(&dev->mode_config.connection_mutex);
408 	mutex_init(&dev->mode_config.idr_mutex);
409 	mutex_init(&dev->mode_config.fb_lock);
410 	mutex_init(&dev->mode_config.blob_lock);
411 	INIT_LIST_HEAD(&dev->mode_config.fb_list);
412 	INIT_LIST_HEAD(&dev->mode_config.crtc_list);
413 	INIT_LIST_HEAD(&dev->mode_config.connector_list);
414 	INIT_LIST_HEAD(&dev->mode_config.encoder_list);
415 	INIT_LIST_HEAD(&dev->mode_config.property_list);
416 	INIT_LIST_HEAD(&dev->mode_config.property_blob_list);
417 	INIT_LIST_HEAD(&dev->mode_config.plane_list);
418 	INIT_LIST_HEAD(&dev->mode_config.privobj_list);
419 	idr_init_base(&dev->mode_config.object_idr, 1);
420 	idr_init_base(&dev->mode_config.tile_idr, 1);
421 	ida_init(&dev->mode_config.connector_ida);
422 	spin_lock_init(&dev->mode_config.connector_list_lock);
423 
424 	init_llist_head(&dev->mode_config.connector_free_list);
425 	INIT_WORK(&dev->mode_config.connector_free_work, drm_connector_free_work_fn);
426 
427 	ret = drm_mode_create_standard_properties(dev);
428 	if (ret) {
429 		drm_mode_config_cleanup(dev);
430 		return ret;
431 	}
432 
433 	/* Just to be sure */
434 	dev->mode_config.num_fb = 0;
435 	dev->mode_config.num_connector = 0;
436 	dev->mode_config.num_crtc = 0;
437 	dev->mode_config.num_encoder = 0;
438 	dev->mode_config.num_total_plane = 0;
439 
440 	if (IS_ENABLED(CONFIG_LOCKDEP)) {
441 		struct drm_modeset_acquire_ctx modeset_ctx;
442 		struct ww_acquire_ctx resv_ctx;
443 		struct dma_resv resv;
444 		int ret;
445 
446 		dma_resv_init(&resv);
447 
448 		drm_modeset_acquire_init(&modeset_ctx, 0);
449 		ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
450 				       &modeset_ctx);
451 		if (ret == -EDEADLK)
452 			ret = drm_modeset_backoff(&modeset_ctx);
453 
454 		ww_acquire_init(&resv_ctx, &reservation_ww_class);
455 		ret = dma_resv_lock(&resv, &resv_ctx);
456 		if (ret == -EDEADLK)
457 			dma_resv_lock_slow(&resv, &resv_ctx);
458 
459 		dma_resv_unlock(&resv);
460 		ww_acquire_fini(&resv_ctx);
461 
462 		drm_modeset_drop_locks(&modeset_ctx);
463 		drm_modeset_acquire_fini(&modeset_ctx);
464 		dma_resv_fini(&resv);
465 	}
466 
467 	return drmm_add_action_or_reset(dev, drm_mode_config_init_release,
468 					NULL);
469 }
470 EXPORT_SYMBOL(drmm_mode_config_init);
471 
472 /**
473  * drm_mode_config_cleanup - free up DRM mode_config info
474  * @dev: DRM device
475  *
476  * Free up all the connectors and CRTCs associated with this DRM device, then
477  * free up the framebuffers and associated buffer objects.
478  *
479  * Note that since this /should/ happen single-threaded at driver/device
480  * teardown time, no locking is required. It's the driver's job to ensure that
481  * this guarantee actually holds true.
482  *
483  * FIXME: With the managed drmm_mode_config_init() it is no longer necessary for
484  * drivers to explicitly call this function.
485  */
drm_mode_config_cleanup(struct drm_device * dev)486 void drm_mode_config_cleanup(struct drm_device *dev)
487 {
488 	struct drm_connector *connector;
489 	struct drm_connector_list_iter conn_iter;
490 	struct drm_crtc *crtc, *ct;
491 	struct drm_encoder *encoder, *enct;
492 	struct drm_framebuffer *fb, *fbt;
493 	struct drm_property *property, *pt;
494 	struct drm_property_blob *blob, *bt;
495 	struct drm_plane *plane, *plt;
496 
497 	list_for_each_entry_safe(encoder, enct, &dev->mode_config.encoder_list,
498 				 head) {
499 		encoder->funcs->destroy(encoder);
500 	}
501 
502 	drm_connector_list_iter_begin(dev, &conn_iter);
503 	drm_for_each_connector_iter(connector, &conn_iter) {
504 		/* drm_connector_list_iter holds an full reference to the
505 		 * current connector itself, which means it is inherently safe
506 		 * against unreferencing the current connector - but not against
507 		 * deleting it right away. */
508 		drm_connector_put(connector);
509 	}
510 	drm_connector_list_iter_end(&conn_iter);
511 	/* connector_iter drops references in a work item. */
512 	flush_work(&dev->mode_config.connector_free_work);
513 	if (WARN_ON(!list_empty(&dev->mode_config.connector_list))) {
514 		drm_connector_list_iter_begin(dev, &conn_iter);
515 		drm_for_each_connector_iter(connector, &conn_iter)
516 			DRM_ERROR("connector %s leaked!\n", connector->name);
517 		drm_connector_list_iter_end(&conn_iter);
518 	}
519 
520 	list_for_each_entry_safe(property, pt, &dev->mode_config.property_list,
521 				 head) {
522 		drm_property_destroy(dev, property);
523 	}
524 
525 	list_for_each_entry_safe(plane, plt, &dev->mode_config.plane_list,
526 				 head) {
527 		plane->funcs->destroy(plane);
528 	}
529 
530 	list_for_each_entry_safe(crtc, ct, &dev->mode_config.crtc_list, head) {
531 		crtc->funcs->destroy(crtc);
532 	}
533 
534 	list_for_each_entry_safe(blob, bt, &dev->mode_config.property_blob_list,
535 				 head_global) {
536 		drm_property_blob_put(blob);
537 	}
538 
539 	/*
540 	 * Single-threaded teardown context, so it's not required to grab the
541 	 * fb_lock to protect against concurrent fb_list access. Contrary, it
542 	 * would actually deadlock with the drm_framebuffer_cleanup function.
543 	 *
544 	 * Also, if there are any framebuffers left, that's a driver leak now,
545 	 * so politely WARN about this.
546 	 */
547 	WARN_ON(!list_empty(&dev->mode_config.fb_list));
548 	list_for_each_entry_safe(fb, fbt, &dev->mode_config.fb_list, head) {
549 		struct drm_printer p = drm_debug_printer("[leaked fb]");
550 
551 		drm_printf(&p, "framebuffer[%u]:\n", fb->base.id);
552 		drm_framebuffer_print_info(&p, 1, fb);
553 		drm_framebuffer_free(&fb->base.refcount);
554 	}
555 
556 	ida_destroy(&dev->mode_config.connector_ida);
557 	idr_destroy(&dev->mode_config.tile_idr);
558 	idr_destroy(&dev->mode_config.object_idr);
559 	drm_modeset_lock_fini(&dev->mode_config.connection_mutex);
560 }
561 EXPORT_SYMBOL(drm_mode_config_cleanup);
562 
full_encoder_mask(struct drm_device * dev)563 static u32 full_encoder_mask(struct drm_device *dev)
564 {
565 	struct drm_encoder *encoder;
566 	u32 encoder_mask = 0;
567 
568 	drm_for_each_encoder(encoder, dev)
569 		encoder_mask |= drm_encoder_mask(encoder);
570 
571 	return encoder_mask;
572 }
573 
574 /*
575  * For some reason we want the encoder itself included in
576  * possible_clones. Make life easy for drivers by allowing them
577  * to leave possible_clones unset if no cloning is possible.
578  */
fixup_encoder_possible_clones(struct drm_encoder * encoder)579 static void fixup_encoder_possible_clones(struct drm_encoder *encoder)
580 {
581 	if (encoder->possible_clones == 0)
582 		encoder->possible_clones = drm_encoder_mask(encoder);
583 }
584 
validate_encoder_possible_clones(struct drm_encoder * encoder)585 static void validate_encoder_possible_clones(struct drm_encoder *encoder)
586 {
587 	struct drm_device *dev = encoder->dev;
588 	u32 encoder_mask = full_encoder_mask(dev);
589 	struct drm_encoder *other;
590 
591 	drm_for_each_encoder(other, dev) {
592 		WARN(!!(encoder->possible_clones & drm_encoder_mask(other)) !=
593 		     !!(other->possible_clones & drm_encoder_mask(encoder)),
594 		     "possible_clones mismatch: "
595 		     "[ENCODER:%d:%s] mask=0x%x possible_clones=0x%x vs. "
596 		     "[ENCODER:%d:%s] mask=0x%x possible_clones=0x%x\n",
597 		     encoder->base.id, encoder->name,
598 		     drm_encoder_mask(encoder), encoder->possible_clones,
599 		     other->base.id, other->name,
600 		     drm_encoder_mask(other), other->possible_clones);
601 	}
602 
603 	WARN((encoder->possible_clones & drm_encoder_mask(encoder)) == 0 ||
604 	     (encoder->possible_clones & ~encoder_mask) != 0,
605 	     "Bogus possible_clones: "
606 	     "[ENCODER:%d:%s] possible_clones=0x%x (full encoder mask=0x%x)\n",
607 	     encoder->base.id, encoder->name,
608 	     encoder->possible_clones, encoder_mask);
609 }
610 
full_crtc_mask(struct drm_device * dev)611 static u32 full_crtc_mask(struct drm_device *dev)
612 {
613 	struct drm_crtc *crtc;
614 	u32 crtc_mask = 0;
615 
616 	drm_for_each_crtc(crtc, dev)
617 		crtc_mask |= drm_crtc_mask(crtc);
618 
619 	return crtc_mask;
620 }
621 
validate_encoder_possible_crtcs(struct drm_encoder * encoder)622 static void validate_encoder_possible_crtcs(struct drm_encoder *encoder)
623 {
624 	u32 crtc_mask = full_crtc_mask(encoder->dev);
625 
626 	WARN((encoder->possible_crtcs & crtc_mask) == 0 ||
627 	     (encoder->possible_crtcs & ~crtc_mask) != 0,
628 	     "Bogus possible_crtcs: "
629 	     "[ENCODER:%d:%s] possible_crtcs=0x%x (full crtc mask=0x%x)\n",
630 	     encoder->base.id, encoder->name,
631 	     encoder->possible_crtcs, crtc_mask);
632 }
633 
drm_mode_config_validate(struct drm_device * dev)634 void drm_mode_config_validate(struct drm_device *dev)
635 {
636 	struct drm_encoder *encoder;
637 	struct drm_crtc *crtc;
638 	struct drm_plane *plane;
639 	u32 primary_with_crtc = 0, cursor_with_crtc = 0;
640 	unsigned int num_primary = 0;
641 
642 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
643 		return;
644 
645 	drm_for_each_encoder(encoder, dev)
646 		fixup_encoder_possible_clones(encoder);
647 
648 	drm_for_each_encoder(encoder, dev) {
649 		validate_encoder_possible_clones(encoder);
650 		validate_encoder_possible_crtcs(encoder);
651 	}
652 
653 	drm_for_each_crtc(crtc, dev) {
654 		WARN(!crtc->primary, "Missing primary plane on [CRTC:%d:%s]\n",
655 		     crtc->base.id, crtc->name);
656 
657 		WARN(crtc->cursor && crtc->funcs->cursor_set,
658 		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_set func",
659 		     crtc->base.id, crtc->name);
660 		WARN(crtc->cursor && crtc->funcs->cursor_set2,
661 		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_set2 func",
662 		     crtc->base.id, crtc->name);
663 		WARN(crtc->cursor && crtc->funcs->cursor_move,
664 		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_move func",
665 		     crtc->base.id, crtc->name);
666 
667 		if (crtc->primary) {
668 			WARN(!(crtc->primary->possible_crtcs & drm_crtc_mask(crtc)),
669 			     "Bogus primary plane possible_crtcs: [PLANE:%d:%s] must be compatible with [CRTC:%d:%s]\n",
670 			     crtc->primary->base.id, crtc->primary->name,
671 			     crtc->base.id, crtc->name);
672 			WARN(primary_with_crtc & drm_plane_mask(crtc->primary),
673 			     "Primary plane [PLANE:%d:%s] used for multiple CRTCs",
674 			     crtc->primary->base.id, crtc->primary->name);
675 			primary_with_crtc |= drm_plane_mask(crtc->primary);
676 		}
677 		if (crtc->cursor) {
678 			WARN(!(crtc->cursor->possible_crtcs & drm_crtc_mask(crtc)),
679 			     "Bogus cursor plane possible_crtcs: [PLANE:%d:%s] must be compatible with [CRTC:%d:%s]\n",
680 			     crtc->cursor->base.id, crtc->cursor->name,
681 			     crtc->base.id, crtc->name);
682 			WARN(cursor_with_crtc & drm_plane_mask(crtc->cursor),
683 			     "Cursor plane [PLANE:%d:%s] used for multiple CRTCs",
684 			     crtc->cursor->base.id, crtc->cursor->name);
685 			cursor_with_crtc |= drm_plane_mask(crtc->cursor);
686 		}
687 	}
688 
689 	drm_for_each_plane(plane, dev) {
690 		if (plane->type == DRM_PLANE_TYPE_PRIMARY)
691 			num_primary++;
692 	}
693 
694 	WARN(num_primary != dev->mode_config.num_crtc,
695 	     "Must have as many primary planes as there are CRTCs, but have %u primary planes and %u CRTCs",
696 	     num_primary, dev->mode_config.num_crtc);
697 }
698