1 /*
2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 * Copyright (c) 2008 Red Hat Inc.
5 *
6 * DRM core CRTC related functions
7 *
8 * Permission to use, copy, modify, distribute, and sell this software and its
9 * documentation for any purpose is hereby granted without fee, provided that
10 * the above copyright notice appear in all copies and that both that copyright
11 * notice and this permission notice appear in supporting documentation, and
12 * that the name of the copyright holders not be used in advertising or
13 * publicity pertaining to distribution of the software without specific,
14 * written prior permission. The copyright holders make no representations
15 * about the suitability of this software for any purpose. It is provided "as
16 * is" without express or implied warranty.
17 *
18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 * OF THIS SOFTWARE.
25 *
26 * Authors:
27 * Keith Packard
28 * Eric Anholt <eric@anholt.net>
29 * Dave Airlie <airlied@linux.ie>
30 * Jesse Barnes <jesse.barnes@intel.com>
31 */
32 #include <linux/ctype.h>
33 #include <linux/list.h>
34 #include <linux/slab.h>
35 #include <linux/export.h>
36 #include <linux/fence.h>
37 #include <drm/drmP.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_edid.h>
40 #include <drm/drm_fourcc.h>
41 #include <drm/drm_modeset_lock.h>
42 #include <drm/drm_atomic.h>
43 #include <drm/drm_auth.h>
44 #include <drm/drm_framebuffer.h>
45
46 #include "drm_crtc_internal.h"
47 #include "drm_internal.h"
48
49 /*
50 * Global properties
51 */
52 static const struct drm_prop_enum_list drm_plane_type_enum_list[] = {
53 { DRM_PLANE_TYPE_OVERLAY, "Overlay" },
54 { DRM_PLANE_TYPE_PRIMARY, "Primary" },
55 { DRM_PLANE_TYPE_CURSOR, "Cursor" },
56 };
57
58 /*
59 * Optional properties
60 */
61 /**
62 * drm_crtc_force_disable - Forcibly turn off a CRTC
63 * @crtc: CRTC to turn off
64 *
65 * Returns:
66 * Zero on success, error code on failure.
67 */
drm_crtc_force_disable(struct drm_crtc * crtc)68 int drm_crtc_force_disable(struct drm_crtc *crtc)
69 {
70 struct drm_mode_set set = {
71 .crtc = crtc,
72 };
73
74 return drm_mode_set_config_internal(&set);
75 }
76 EXPORT_SYMBOL(drm_crtc_force_disable);
77
78 /**
79 * drm_crtc_force_disable_all - Forcibly turn off all enabled CRTCs
80 * @dev: DRM device whose CRTCs to turn off
81 *
82 * Drivers may want to call this on unload to ensure that all displays are
83 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
84 *
85 * Returns:
86 * Zero on success, error code on failure.
87 */
drm_crtc_force_disable_all(struct drm_device * dev)88 int drm_crtc_force_disable_all(struct drm_device *dev)
89 {
90 struct drm_crtc *crtc;
91 int ret = 0;
92
93 drm_modeset_lock_all(dev);
94 drm_for_each_crtc(crtc, dev)
95 if (crtc->enabled) {
96 ret = drm_crtc_force_disable(crtc);
97 if (ret)
98 goto out;
99 }
100 out:
101 drm_modeset_unlock_all(dev);
102 return ret;
103 }
104 EXPORT_SYMBOL(drm_crtc_force_disable_all);
105
106 DEFINE_WW_CLASS(crtc_ww_class);
107
drm_num_crtcs(struct drm_device * dev)108 static unsigned int drm_num_crtcs(struct drm_device *dev)
109 {
110 unsigned int num = 0;
111 struct drm_crtc *tmp;
112
113 drm_for_each_crtc(tmp, dev) {
114 num++;
115 }
116
117 return num;
118 }
119
drm_crtc_register_all(struct drm_device * dev)120 static int drm_crtc_register_all(struct drm_device *dev)
121 {
122 struct drm_crtc *crtc;
123 int ret = 0;
124
125 drm_for_each_crtc(crtc, dev) {
126 if (crtc->funcs->late_register)
127 ret = crtc->funcs->late_register(crtc);
128 if (ret)
129 return ret;
130 }
131
132 return 0;
133 }
134
drm_crtc_unregister_all(struct drm_device * dev)135 static void drm_crtc_unregister_all(struct drm_device *dev)
136 {
137 struct drm_crtc *crtc;
138
139 drm_for_each_crtc(crtc, dev) {
140 if (crtc->funcs->early_unregister)
141 crtc->funcs->early_unregister(crtc);
142 }
143 }
144
145 static const struct fence_ops drm_crtc_fence_ops;
146
fence_to_crtc(struct fence * fence)147 static struct drm_crtc *fence_to_crtc(struct fence *fence)
148 {
149 BUG_ON(fence->ops != &drm_crtc_fence_ops);
150 return container_of(fence->lock, struct drm_crtc, fence_lock);
151 }
152
drm_crtc_fence_get_driver_name(struct fence * fence)153 static const char *drm_crtc_fence_get_driver_name(struct fence *fence)
154 {
155 struct drm_crtc *crtc = fence_to_crtc(fence);
156
157 return crtc->dev->driver->name;
158 }
159
drm_crtc_fence_get_timeline_name(struct fence * fence)160 static const char *drm_crtc_fence_get_timeline_name(struct fence *fence)
161 {
162 struct drm_crtc *crtc = fence_to_crtc(fence);
163
164 return crtc->timeline_name;
165 }
166
drm_crtc_fence_enable_signaling(struct fence * fence)167 static bool drm_crtc_fence_enable_signaling(struct fence *fence)
168 {
169 return true;
170 }
171
172 static const struct fence_ops drm_crtc_fence_ops = {
173 .get_driver_name = drm_crtc_fence_get_driver_name,
174 .get_timeline_name = drm_crtc_fence_get_timeline_name,
175 .enable_signaling = drm_crtc_fence_enable_signaling,
176 .wait = fence_default_wait,
177 };
178
drm_crtc_create_fence(struct drm_crtc * crtc)179 struct fence *drm_crtc_create_fence(struct drm_crtc *crtc)
180 {
181 struct fence *fence;
182
183 fence = kzalloc(sizeof(*fence), GFP_KERNEL);
184 if (!fence)
185 return NULL;
186
187 fence_init(fence, &drm_crtc_fence_ops, &crtc->fence_lock,
188 crtc->fence_context, ++crtc->fence_seqno);
189
190 return fence;
191 }
192
193 /**
194 * drm_crtc_init_with_planes - Initialise a new CRTC object with
195 * specified primary and cursor planes.
196 * @dev: DRM device
197 * @crtc: CRTC object to init
198 * @primary: Primary plane for CRTC
199 * @cursor: Cursor plane for CRTC
200 * @funcs: callbacks for the new CRTC
201 * @name: printf style format string for the CRTC name, or NULL for default name
202 *
203 * Inits a new object created as base part of a driver crtc object. Drivers
204 * should use this function instead of drm_crtc_init(), which is only provided
205 * for backwards compatibility with drivers which do not yet support universal
206 * planes). For really simple hardware which has only 1 plane look at
207 * drm_simple_display_pipe_init() instead.
208 *
209 * Returns:
210 * Zero on success, error code on failure.
211 */
drm_crtc_init_with_planes(struct drm_device * dev,struct drm_crtc * crtc,struct drm_plane * primary,struct drm_plane * cursor,const struct drm_crtc_funcs * funcs,const char * name,...)212 int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
213 struct drm_plane *primary,
214 struct drm_plane *cursor,
215 const struct drm_crtc_funcs *funcs,
216 const char *name, ...)
217 {
218 struct drm_mode_config *config = &dev->mode_config;
219 int ret;
220
221 WARN_ON(primary && primary->type != DRM_PLANE_TYPE_PRIMARY);
222 WARN_ON(cursor && cursor->type != DRM_PLANE_TYPE_CURSOR);
223
224 crtc->dev = dev;
225 crtc->funcs = funcs;
226
227 INIT_LIST_HEAD(&crtc->commit_list);
228 spin_lock_init(&crtc->commit_lock);
229
230 drm_modeset_lock_init(&crtc->mutex);
231 ret = drm_mode_object_get(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
232 if (ret)
233 return ret;
234
235 if (name) {
236 va_list ap;
237
238 va_start(ap, name);
239 crtc->name = kvasprintf(GFP_KERNEL, name, ap);
240 va_end(ap);
241 } else {
242 crtc->name = kasprintf(GFP_KERNEL, "crtc-%d",
243 drm_num_crtcs(dev));
244 }
245 if (!crtc->name) {
246 drm_mode_object_unregister(dev, &crtc->base);
247 return -ENOMEM;
248 }
249
250 crtc->fence_context = fence_context_alloc(1);
251 spin_lock_init(&crtc->fence_lock);
252 snprintf(crtc->timeline_name, sizeof(crtc->timeline_name),
253 "CRTC:%d-%s", crtc->base.id, crtc->name);
254
255 crtc->base.properties = &crtc->properties;
256
257 list_add_tail(&crtc->head, &config->crtc_list);
258 crtc->index = config->num_crtc++;
259
260 crtc->primary = primary;
261 crtc->cursor = cursor;
262 if (primary)
263 primary->possible_crtcs = 1 << drm_crtc_index(crtc);
264 if (cursor)
265 cursor->possible_crtcs = 1 << drm_crtc_index(crtc);
266
267 if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
268 drm_object_attach_property(&crtc->base, config->prop_active, 0);
269 drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
270 drm_object_attach_property(&crtc->base,
271 config->prop_out_fence_ptr, 0);
272 }
273
274 return 0;
275 }
276 EXPORT_SYMBOL(drm_crtc_init_with_planes);
277
278 /**
279 * drm_crtc_cleanup - Clean up the core crtc usage
280 * @crtc: CRTC to cleanup
281 *
282 * This function cleans up @crtc and removes it from the DRM mode setting
283 * core. Note that the function does *not* free the crtc structure itself,
284 * this is the responsibility of the caller.
285 */
drm_crtc_cleanup(struct drm_crtc * crtc)286 void drm_crtc_cleanup(struct drm_crtc *crtc)
287 {
288 struct drm_device *dev = crtc->dev;
289
290 /* Note that the crtc_list is considered to be static; should we
291 * remove the drm_crtc at runtime we would have to decrement all
292 * the indices on the drm_crtc after us in the crtc_list.
293 */
294
295 kfree(crtc->gamma_store);
296 crtc->gamma_store = NULL;
297
298 drm_modeset_lock_fini(&crtc->mutex);
299
300 drm_mode_object_unregister(dev, &crtc->base);
301 list_del(&crtc->head);
302 dev->mode_config.num_crtc--;
303
304 WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
305 if (crtc->state && crtc->funcs->atomic_destroy_state)
306 crtc->funcs->atomic_destroy_state(crtc, crtc->state);
307
308 kfree(crtc->name);
309
310 memset(crtc, 0, sizeof(*crtc));
311 }
312 EXPORT_SYMBOL(drm_crtc_cleanup);
313
drm_modeset_register_all(struct drm_device * dev)314 int drm_modeset_register_all(struct drm_device *dev)
315 {
316 int ret;
317
318 ret = drm_plane_register_all(dev);
319 if (ret)
320 goto err_plane;
321
322 ret = drm_crtc_register_all(dev);
323 if (ret)
324 goto err_crtc;
325
326 ret = drm_encoder_register_all(dev);
327 if (ret)
328 goto err_encoder;
329
330 ret = drm_connector_register_all(dev);
331 if (ret)
332 goto err_connector;
333
334 return 0;
335
336 err_connector:
337 drm_encoder_unregister_all(dev);
338 err_encoder:
339 drm_crtc_unregister_all(dev);
340 err_crtc:
341 drm_plane_unregister_all(dev);
342 err_plane:
343 return ret;
344 }
345
drm_modeset_unregister_all(struct drm_device * dev)346 void drm_modeset_unregister_all(struct drm_device *dev)
347 {
348 drm_connector_unregister_all(dev);
349 drm_encoder_unregister_all(dev);
350 drm_crtc_unregister_all(dev);
351 drm_plane_unregister_all(dev);
352 }
353
drm_mode_create_standard_properties(struct drm_device * dev)354 static int drm_mode_create_standard_properties(struct drm_device *dev)
355 {
356 struct drm_property *prop;
357 int ret;
358
359 ret = drm_connector_create_standard_properties(dev);
360 if (ret)
361 return ret;
362
363 prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
364 "type", drm_plane_type_enum_list,
365 ARRAY_SIZE(drm_plane_type_enum_list));
366 if (!prop)
367 return -ENOMEM;
368 dev->mode_config.plane_type_property = prop;
369
370 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
371 "SRC_X", 0, UINT_MAX);
372 if (!prop)
373 return -ENOMEM;
374 dev->mode_config.prop_src_x = prop;
375
376 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
377 "SRC_Y", 0, UINT_MAX);
378 if (!prop)
379 return -ENOMEM;
380 dev->mode_config.prop_src_y = prop;
381
382 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
383 "SRC_W", 0, UINT_MAX);
384 if (!prop)
385 return -ENOMEM;
386 dev->mode_config.prop_src_w = prop;
387
388 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
389 "SRC_H", 0, UINT_MAX);
390 if (!prop)
391 return -ENOMEM;
392 dev->mode_config.prop_src_h = prop;
393
394 prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
395 "CRTC_X", INT_MIN, INT_MAX);
396 if (!prop)
397 return -ENOMEM;
398 dev->mode_config.prop_crtc_x = prop;
399
400 prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
401 "CRTC_Y", INT_MIN, INT_MAX);
402 if (!prop)
403 return -ENOMEM;
404 dev->mode_config.prop_crtc_y = prop;
405
406 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
407 "CRTC_W", 0, INT_MAX);
408 if (!prop)
409 return -ENOMEM;
410 dev->mode_config.prop_crtc_w = prop;
411
412 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
413 "CRTC_H", 0, INT_MAX);
414 if (!prop)
415 return -ENOMEM;
416 dev->mode_config.prop_crtc_h = prop;
417
418 prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
419 "FB_ID", DRM_MODE_OBJECT_FB);
420 if (!prop)
421 return -ENOMEM;
422 dev->mode_config.prop_fb_id = prop;
423
424 prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
425 "IN_FENCE_FD", -1, INT_MAX);
426 if (!prop)
427 return -ENOMEM;
428 dev->mode_config.prop_in_fence_fd = prop;
429
430 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
431 "OUT_FENCE_PTR", 0, U64_MAX);
432 if (!prop)
433 return -ENOMEM;
434 dev->mode_config.prop_out_fence_ptr = prop;
435
436 prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
437 "CRTC_ID", DRM_MODE_OBJECT_CRTC);
438 if (!prop)
439 return -ENOMEM;
440 dev->mode_config.prop_crtc_id = prop;
441
442 prop = drm_property_create_bool(dev, DRM_MODE_PROP_ATOMIC,
443 "ACTIVE");
444 if (!prop)
445 return -ENOMEM;
446 dev->mode_config.prop_active = prop;
447
448 prop = drm_property_create(dev,
449 DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
450 "MODE_ID", 0);
451 if (!prop)
452 return -ENOMEM;
453 dev->mode_config.prop_mode_id = prop;
454
455 prop = drm_property_create(dev,
456 DRM_MODE_PROP_BLOB,
457 "DEGAMMA_LUT", 0);
458 if (!prop)
459 return -ENOMEM;
460 dev->mode_config.degamma_lut_property = prop;
461
462 prop = drm_property_create_range(dev,
463 DRM_MODE_PROP_IMMUTABLE,
464 "DEGAMMA_LUT_SIZE", 0, UINT_MAX);
465 if (!prop)
466 return -ENOMEM;
467 dev->mode_config.degamma_lut_size_property = prop;
468
469 prop = drm_property_create(dev,
470 DRM_MODE_PROP_BLOB,
471 "CTM", 0);
472 if (!prop)
473 return -ENOMEM;
474 dev->mode_config.ctm_property = prop;
475
476 prop = drm_property_create(dev,
477 DRM_MODE_PROP_BLOB,
478 "GAMMA_LUT", 0);
479 if (!prop)
480 return -ENOMEM;
481 dev->mode_config.gamma_lut_property = prop;
482
483 prop = drm_property_create_range(dev,
484 DRM_MODE_PROP_IMMUTABLE,
485 "GAMMA_LUT_SIZE", 0, UINT_MAX);
486 if (!prop)
487 return -ENOMEM;
488 dev->mode_config.gamma_lut_size_property = prop;
489
490 return 0;
491 }
492
493 /**
494 * drm_mode_getresources - get graphics configuration
495 * @dev: drm device for the ioctl
496 * @data: data pointer for the ioctl
497 * @file_priv: drm file for the ioctl call
498 *
499 * Construct a set of configuration description structures and return
500 * them to the user, including CRTC, connector and framebuffer configuration.
501 *
502 * Called by the user via ioctl.
503 *
504 * Returns:
505 * Zero on success, negative errno on failure.
506 */
drm_mode_getresources(struct drm_device * dev,void * data,struct drm_file * file_priv)507 int drm_mode_getresources(struct drm_device *dev, void *data,
508 struct drm_file *file_priv)
509 {
510 struct drm_mode_card_res *card_res = data;
511 struct list_head *lh;
512 struct drm_framebuffer *fb;
513 struct drm_connector *connector;
514 struct drm_crtc *crtc;
515 struct drm_encoder *encoder;
516 int ret = 0;
517 int connector_count = 0;
518 int crtc_count = 0;
519 int fb_count = 0;
520 int encoder_count = 0;
521 int copied = 0;
522 uint32_t __user *fb_id;
523 uint32_t __user *crtc_id;
524 uint32_t __user *connector_id;
525 uint32_t __user *encoder_id;
526
527 if (!drm_core_check_feature(dev, DRIVER_MODESET))
528 return -EINVAL;
529
530
531 mutex_lock(&file_priv->fbs_lock);
532 /*
533 * For the non-control nodes we need to limit the list of resources
534 * by IDs in the group list for this node
535 */
536 list_for_each(lh, &file_priv->fbs)
537 fb_count++;
538
539 /* handle this in 4 parts */
540 /* FBs */
541 if (card_res->count_fbs >= fb_count) {
542 copied = 0;
543 fb_id = (uint32_t __user *)(unsigned long)card_res->fb_id_ptr;
544 list_for_each_entry(fb, &file_priv->fbs, filp_head) {
545 if (put_user(fb->base.id, fb_id + copied)) {
546 mutex_unlock(&file_priv->fbs_lock);
547 return -EFAULT;
548 }
549 copied++;
550 }
551 }
552 card_res->count_fbs = fb_count;
553 mutex_unlock(&file_priv->fbs_lock);
554
555 /* mode_config.mutex protects the connector list against e.g. DP MST
556 * connector hot-adding. CRTC/Plane lists are invariant. */
557 mutex_lock(&dev->mode_config.mutex);
558 drm_for_each_crtc(crtc, dev)
559 crtc_count++;
560
561 drm_for_each_connector(connector, dev)
562 connector_count++;
563
564 drm_for_each_encoder(encoder, dev)
565 encoder_count++;
566
567 card_res->max_height = dev->mode_config.max_height;
568 card_res->min_height = dev->mode_config.min_height;
569 card_res->max_width = dev->mode_config.max_width;
570 card_res->min_width = dev->mode_config.min_width;
571
572 /* CRTCs */
573 if (card_res->count_crtcs >= crtc_count) {
574 copied = 0;
575 crtc_id = (uint32_t __user *)(unsigned long)card_res->crtc_id_ptr;
576 drm_for_each_crtc(crtc, dev) {
577 if (put_user(crtc->base.id, crtc_id + copied)) {
578 ret = -EFAULT;
579 goto out;
580 }
581 copied++;
582 }
583 }
584 card_res->count_crtcs = crtc_count;
585
586 /* Encoders */
587 if (card_res->count_encoders >= encoder_count) {
588 copied = 0;
589 encoder_id = (uint32_t __user *)(unsigned long)card_res->encoder_id_ptr;
590 drm_for_each_encoder(encoder, dev) {
591 if (put_user(encoder->base.id, encoder_id +
592 copied)) {
593 ret = -EFAULT;
594 goto out;
595 }
596 copied++;
597 }
598 }
599 card_res->count_encoders = encoder_count;
600
601 /* Connectors */
602 if (card_res->count_connectors >= connector_count) {
603 copied = 0;
604 connector_id = (uint32_t __user *)(unsigned long)card_res->connector_id_ptr;
605 drm_for_each_connector(connector, dev) {
606 if (put_user(connector->base.id,
607 connector_id + copied)) {
608 ret = -EFAULT;
609 goto out;
610 }
611 copied++;
612 }
613 }
614 card_res->count_connectors = connector_count;
615
616 out:
617 mutex_unlock(&dev->mode_config.mutex);
618 return ret;
619 }
620
621 /**
622 * drm_mode_getcrtc - get CRTC configuration
623 * @dev: drm device for the ioctl
624 * @data: data pointer for the ioctl
625 * @file_priv: drm file for the ioctl call
626 *
627 * Construct a CRTC configuration structure to return to the user.
628 *
629 * Called by the user via ioctl.
630 *
631 * Returns:
632 * Zero on success, negative errno on failure.
633 */
drm_mode_getcrtc(struct drm_device * dev,void * data,struct drm_file * file_priv)634 int drm_mode_getcrtc(struct drm_device *dev,
635 void *data, struct drm_file *file_priv)
636 {
637 struct drm_mode_crtc *crtc_resp = data;
638 struct drm_crtc *crtc;
639
640 if (!drm_core_check_feature(dev, DRIVER_MODESET))
641 return -EINVAL;
642
643 crtc = drm_crtc_find(dev, crtc_resp->crtc_id);
644 if (!crtc)
645 return -ENOENT;
646
647 drm_modeset_lock_crtc(crtc, crtc->primary);
648 crtc_resp->gamma_size = crtc->gamma_size;
649 if (crtc->primary->fb)
650 crtc_resp->fb_id = crtc->primary->fb->base.id;
651 else
652 crtc_resp->fb_id = 0;
653
654 if (crtc->state) {
655 crtc_resp->x = crtc->primary->state->src_x >> 16;
656 crtc_resp->y = crtc->primary->state->src_y >> 16;
657 if (crtc->state->enable) {
658 drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
659 crtc_resp->mode_valid = 1;
660
661 } else {
662 crtc_resp->mode_valid = 0;
663 }
664 } else {
665 crtc_resp->x = crtc->x;
666 crtc_resp->y = crtc->y;
667 if (crtc->enabled) {
668 drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->mode);
669 crtc_resp->mode_valid = 1;
670
671 } else {
672 crtc_resp->mode_valid = 0;
673 }
674 }
675 drm_modeset_unlock_crtc(crtc);
676
677 return 0;
678 }
679
680 /**
681 * drm_mode_set_config_internal - helper to call ->set_config
682 * @set: modeset config to set
683 *
684 * This is a little helper to wrap internal calls to the ->set_config driver
685 * interface. The only thing it adds is correct refcounting dance.
686 *
687 * Returns:
688 * Zero on success, negative errno on failure.
689 */
drm_mode_set_config_internal(struct drm_mode_set * set)690 int drm_mode_set_config_internal(struct drm_mode_set *set)
691 {
692 struct drm_crtc *crtc = set->crtc;
693 struct drm_framebuffer *fb;
694 struct drm_crtc *tmp;
695 int ret;
696
697 /*
698 * NOTE: ->set_config can also disable other crtcs (if we steal all
699 * connectors from it), hence we need to refcount the fbs across all
700 * crtcs. Atomic modeset will have saner semantics ...
701 */
702 drm_for_each_crtc(tmp, crtc->dev)
703 tmp->primary->old_fb = tmp->primary->fb;
704
705 fb = set->fb;
706
707 ret = crtc->funcs->set_config(set);
708 if (ret == 0) {
709 crtc->primary->crtc = crtc;
710 crtc->primary->fb = fb;
711 }
712
713 drm_for_each_crtc(tmp, crtc->dev) {
714 if (tmp->primary->fb)
715 drm_framebuffer_reference(tmp->primary->fb);
716 if (tmp->primary->old_fb)
717 drm_framebuffer_unreference(tmp->primary->old_fb);
718 tmp->primary->old_fb = NULL;
719 }
720
721 return ret;
722 }
723 EXPORT_SYMBOL(drm_mode_set_config_internal);
724
725 /**
726 * drm_crtc_get_hv_timing - Fetches hdisplay/vdisplay for given mode
727 * @mode: mode to query
728 * @hdisplay: hdisplay value to fill in
729 * @vdisplay: vdisplay value to fill in
730 *
731 * The vdisplay value will be doubled if the specified mode is a stereo mode of
732 * the appropriate layout.
733 */
drm_crtc_get_hv_timing(const struct drm_display_mode * mode,int * hdisplay,int * vdisplay)734 void drm_crtc_get_hv_timing(const struct drm_display_mode *mode,
735 int *hdisplay, int *vdisplay)
736 {
737 struct drm_display_mode adjusted;
738
739 drm_mode_copy(&adjusted, mode);
740 drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
741 *hdisplay = adjusted.crtc_hdisplay;
742 *vdisplay = adjusted.crtc_vdisplay;
743 }
744 EXPORT_SYMBOL(drm_crtc_get_hv_timing);
745
746 /**
747 * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
748 * CRTC viewport
749 * @crtc: CRTC that framebuffer will be displayed on
750 * @x: x panning
751 * @y: y panning
752 * @mode: mode that framebuffer will be displayed under
753 * @fb: framebuffer to check size of
754 */
drm_crtc_check_viewport(const struct drm_crtc * crtc,int x,int y,const struct drm_display_mode * mode,const struct drm_framebuffer * fb)755 int drm_crtc_check_viewport(const struct drm_crtc *crtc,
756 int x, int y,
757 const struct drm_display_mode *mode,
758 const struct drm_framebuffer *fb)
759
760 {
761 int hdisplay, vdisplay;
762
763 drm_crtc_get_hv_timing(mode, &hdisplay, &vdisplay);
764
765 if (crtc->state &&
766 crtc->primary->state->rotation & (DRM_ROTATE_90 |
767 DRM_ROTATE_270))
768 swap(hdisplay, vdisplay);
769
770 return drm_framebuffer_check_src_coords(x << 16, y << 16,
771 hdisplay << 16, vdisplay << 16,
772 fb);
773 }
774 EXPORT_SYMBOL(drm_crtc_check_viewport);
775
776 /**
777 * drm_mode_setcrtc - set CRTC configuration
778 * @dev: drm device for the ioctl
779 * @data: data pointer for the ioctl
780 * @file_priv: drm file for the ioctl call
781 *
782 * Build a new CRTC configuration based on user request.
783 *
784 * Called by the user via ioctl.
785 *
786 * Returns:
787 * Zero on success, negative errno on failure.
788 */
drm_mode_setcrtc(struct drm_device * dev,void * data,struct drm_file * file_priv)789 int drm_mode_setcrtc(struct drm_device *dev, void *data,
790 struct drm_file *file_priv)
791 {
792 struct drm_mode_config *config = &dev->mode_config;
793 struct drm_mode_crtc *crtc_req = data;
794 struct drm_crtc *crtc;
795 struct drm_connector **connector_set = NULL, *connector;
796 struct drm_framebuffer *fb = NULL;
797 struct drm_display_mode *mode = NULL;
798 struct drm_mode_set set;
799 uint32_t __user *set_connectors_ptr;
800 int ret;
801 int i;
802
803 if (!drm_core_check_feature(dev, DRIVER_MODESET))
804 return -EINVAL;
805
806 /*
807 * Universal plane src offsets are only 16.16, prevent havoc for
808 * drivers using universal plane code internally.
809 */
810 if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
811 return -ERANGE;
812
813 drm_modeset_lock_all(dev);
814 crtc = drm_crtc_find(dev, crtc_req->crtc_id);
815 if (!crtc) {
816 DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
817 ret = -ENOENT;
818 goto out;
819 }
820 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
821
822 if (crtc_req->mode_valid) {
823 /* If we have a mode we need a framebuffer. */
824 /* If we pass -1, set the mode with the currently bound fb */
825 if (crtc_req->fb_id == -1) {
826 if (!crtc->primary->fb) {
827 DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
828 ret = -EINVAL;
829 goto out;
830 }
831 fb = crtc->primary->fb;
832 /* Make refcounting symmetric with the lookup path. */
833 drm_framebuffer_reference(fb);
834 } else {
835 fb = drm_framebuffer_lookup(dev, crtc_req->fb_id);
836 if (!fb) {
837 DRM_DEBUG_KMS("Unknown FB ID%d\n",
838 crtc_req->fb_id);
839 ret = -ENOENT;
840 goto out;
841 }
842 }
843
844 mode = drm_mode_create(dev);
845 if (!mode) {
846 ret = -ENOMEM;
847 goto out;
848 }
849
850 ret = drm_mode_convert_umode(mode, &crtc_req->mode);
851 if (ret) {
852 DRM_DEBUG_KMS("Invalid mode\n");
853 goto out;
854 }
855
856 /*
857 * Check whether the primary plane supports the fb pixel format.
858 * Drivers not implementing the universal planes API use a
859 * default formats list provided by the DRM core which doesn't
860 * match real hardware capabilities. Skip the check in that
861 * case.
862 */
863 if (!crtc->primary->format_default) {
864 ret = drm_plane_check_pixel_format(crtc->primary,
865 fb->pixel_format);
866 if (ret) {
867 char *format_name = drm_get_format_name(fb->pixel_format);
868 DRM_DEBUG_KMS("Invalid pixel format %s\n", format_name);
869 kfree(format_name);
870 goto out;
871 }
872 }
873
874 ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
875 mode, fb);
876 if (ret)
877 goto out;
878
879 }
880
881 if (crtc_req->count_connectors == 0 && mode) {
882 DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
883 ret = -EINVAL;
884 goto out;
885 }
886
887 if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
888 DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
889 crtc_req->count_connectors);
890 ret = -EINVAL;
891 goto out;
892 }
893
894 if (crtc_req->count_connectors > 0) {
895 u32 out_id;
896
897 /* Avoid unbounded kernel memory allocation */
898 if (crtc_req->count_connectors > config->num_connector) {
899 ret = -EINVAL;
900 goto out;
901 }
902
903 connector_set = kmalloc_array(crtc_req->count_connectors,
904 sizeof(struct drm_connector *),
905 GFP_KERNEL);
906 if (!connector_set) {
907 ret = -ENOMEM;
908 goto out;
909 }
910
911 for (i = 0; i < crtc_req->count_connectors; i++) {
912 connector_set[i] = NULL;
913 set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
914 if (get_user(out_id, &set_connectors_ptr[i])) {
915 ret = -EFAULT;
916 goto out;
917 }
918
919 connector = drm_connector_lookup(dev, out_id);
920 if (!connector) {
921 DRM_DEBUG_KMS("Connector id %d unknown\n",
922 out_id);
923 ret = -ENOENT;
924 goto out;
925 }
926 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
927 connector->base.id,
928 connector->name);
929
930 connector_set[i] = connector;
931 }
932 }
933
934 set.crtc = crtc;
935 set.x = crtc_req->x;
936 set.y = crtc_req->y;
937 set.mode = mode;
938 set.connectors = connector_set;
939 set.num_connectors = crtc_req->count_connectors;
940 set.fb = fb;
941 ret = drm_mode_set_config_internal(&set);
942
943 out:
944 if (fb)
945 drm_framebuffer_unreference(fb);
946
947 if (connector_set) {
948 for (i = 0; i < crtc_req->count_connectors; i++) {
949 if (connector_set[i])
950 drm_connector_unreference(connector_set[i]);
951 }
952 }
953 kfree(connector_set);
954 drm_mode_destroy(dev, mode);
955 drm_modeset_unlock_all(dev);
956 return ret;
957 }
958
drm_mode_crtc_set_obj_prop(struct drm_mode_object * obj,struct drm_property * property,uint64_t value)959 int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
960 struct drm_property *property,
961 uint64_t value)
962 {
963 int ret = -EINVAL;
964 struct drm_crtc *crtc = obj_to_crtc(obj);
965
966 if (crtc->funcs->set_property)
967 ret = crtc->funcs->set_property(crtc, property, value);
968 if (!ret)
969 drm_object_property_set_value(obj, property, value);
970
971 return ret;
972 }
973
974 /**
975 * drm_mode_config_reset - call ->reset callbacks
976 * @dev: drm device
977 *
978 * This functions calls all the crtc's, encoder's and connector's ->reset
979 * callback. Drivers can use this in e.g. their driver load or resume code to
980 * reset hardware and software state.
981 */
drm_mode_config_reset(struct drm_device * dev)982 void drm_mode_config_reset(struct drm_device *dev)
983 {
984 struct drm_crtc *crtc;
985 struct drm_plane *plane;
986 struct drm_encoder *encoder;
987 struct drm_connector *connector;
988
989 drm_for_each_plane(plane, dev)
990 if (plane->funcs->reset)
991 plane->funcs->reset(plane);
992
993 drm_for_each_crtc(crtc, dev)
994 if (crtc->funcs->reset)
995 crtc->funcs->reset(crtc);
996
997 drm_for_each_encoder(encoder, dev)
998 if (encoder->funcs->reset)
999 encoder->funcs->reset(encoder);
1000
1001 mutex_lock(&dev->mode_config.mutex);
1002 drm_for_each_connector(connector, dev)
1003 if (connector->funcs->reset)
1004 connector->funcs->reset(connector);
1005 mutex_unlock(&dev->mode_config.mutex);
1006 }
1007 EXPORT_SYMBOL(drm_mode_config_reset);
1008
1009 /**
1010 * drm_mode_create_dumb_ioctl - create a dumb backing storage buffer
1011 * @dev: DRM device
1012 * @data: ioctl data
1013 * @file_priv: DRM file info
1014 *
1015 * This creates a new dumb buffer in the driver's backing storage manager (GEM,
1016 * TTM or something else entirely) and returns the resulting buffer handle. This
1017 * handle can then be wrapped up into a framebuffer modeset object.
1018 *
1019 * Note that userspace is not allowed to use such objects for render
1020 * acceleration - drivers must create their own private ioctls for such a use
1021 * case.
1022 *
1023 * Called by the user via ioctl.
1024 *
1025 * Returns:
1026 * Zero on success, negative errno on failure.
1027 */
drm_mode_create_dumb_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)1028 int drm_mode_create_dumb_ioctl(struct drm_device *dev,
1029 void *data, struct drm_file *file_priv)
1030 {
1031 struct drm_mode_create_dumb *args = data;
1032 u32 cpp, stride, size;
1033
1034 if (!dev->driver->dumb_create)
1035 return -ENOSYS;
1036 if (!args->width || !args->height || !args->bpp)
1037 return -EINVAL;
1038
1039 /* overflow checks for 32bit size calculations */
1040 /* NOTE: DIV_ROUND_UP() can overflow */
1041 cpp = DIV_ROUND_UP(args->bpp, 8);
1042 if (!cpp || cpp > 0xffffffffU / args->width)
1043 return -EINVAL;
1044 stride = cpp * args->width;
1045 if (args->height > 0xffffffffU / stride)
1046 return -EINVAL;
1047
1048 /* test for wrap-around */
1049 size = args->height * stride;
1050 if (PAGE_ALIGN(size) == 0)
1051 return -EINVAL;
1052
1053 /*
1054 * handle, pitch and size are output parameters. Zero them out to
1055 * prevent drivers from accidentally using uninitialized data. Since
1056 * not all existing userspace is clearing these fields properly we
1057 * cannot reject IOCTL with garbage in them.
1058 */
1059 args->handle = 0;
1060 args->pitch = 0;
1061 args->size = 0;
1062
1063 return dev->driver->dumb_create(file_priv, dev, args);
1064 }
1065
1066 /**
1067 * drm_mode_mmap_dumb_ioctl - create an mmap offset for a dumb backing storage buffer
1068 * @dev: DRM device
1069 * @data: ioctl data
1070 * @file_priv: DRM file info
1071 *
1072 * Allocate an offset in the drm device node's address space to be able to
1073 * memory map a dumb buffer.
1074 *
1075 * Called by the user via ioctl.
1076 *
1077 * Returns:
1078 * Zero on success, negative errno on failure.
1079 */
drm_mode_mmap_dumb_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)1080 int drm_mode_mmap_dumb_ioctl(struct drm_device *dev,
1081 void *data, struct drm_file *file_priv)
1082 {
1083 struct drm_mode_map_dumb *args = data;
1084
1085 /* call driver ioctl to get mmap offset */
1086 if (!dev->driver->dumb_map_offset)
1087 return -ENOSYS;
1088
1089 return dev->driver->dumb_map_offset(file_priv, dev, args->handle, &args->offset);
1090 }
1091
1092 /**
1093 * drm_mode_destroy_dumb_ioctl - destroy a dumb backing strage buffer
1094 * @dev: DRM device
1095 * @data: ioctl data
1096 * @file_priv: DRM file info
1097 *
1098 * This destroys the userspace handle for the given dumb backing storage buffer.
1099 * Since buffer objects must be reference counted in the kernel a buffer object
1100 * won't be immediately freed if a framebuffer modeset object still uses it.
1101 *
1102 * Called by the user via ioctl.
1103 *
1104 * Returns:
1105 * Zero on success, negative errno on failure.
1106 */
drm_mode_destroy_dumb_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)1107 int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
1108 void *data, struct drm_file *file_priv)
1109 {
1110 struct drm_mode_destroy_dumb *args = data;
1111
1112 if (!dev->driver->dumb_destroy)
1113 return -ENOSYS;
1114
1115 return dev->driver->dumb_destroy(file_priv, dev, args->handle);
1116 }
1117
1118 /**
1119 * drm_mode_config_init - initialize DRM mode_configuration structure
1120 * @dev: DRM device
1121 *
1122 * Initialize @dev's mode_config structure, used for tracking the graphics
1123 * configuration of @dev.
1124 *
1125 * Since this initializes the modeset locks, no locking is possible. Which is no
1126 * problem, since this should happen single threaded at init time. It is the
1127 * driver's problem to ensure this guarantee.
1128 *
1129 */
drm_mode_config_init(struct drm_device * dev)1130 void drm_mode_config_init(struct drm_device *dev)
1131 {
1132 mutex_init(&dev->mode_config.mutex);
1133 drm_modeset_lock_init(&dev->mode_config.connection_mutex);
1134 mutex_init(&dev->mode_config.idr_mutex);
1135 mutex_init(&dev->mode_config.fb_lock);
1136 mutex_init(&dev->mode_config.blob_lock);
1137 INIT_LIST_HEAD(&dev->mode_config.fb_list);
1138 INIT_LIST_HEAD(&dev->mode_config.crtc_list);
1139 INIT_LIST_HEAD(&dev->mode_config.connector_list);
1140 INIT_LIST_HEAD(&dev->mode_config.encoder_list);
1141 INIT_LIST_HEAD(&dev->mode_config.property_list);
1142 INIT_LIST_HEAD(&dev->mode_config.property_blob_list);
1143 INIT_LIST_HEAD(&dev->mode_config.plane_list);
1144 idr_init(&dev->mode_config.crtc_idr);
1145 idr_init(&dev->mode_config.tile_idr);
1146 ida_init(&dev->mode_config.connector_ida);
1147
1148 drm_modeset_lock_all(dev);
1149 drm_mode_create_standard_properties(dev);
1150 drm_modeset_unlock_all(dev);
1151
1152 /* Just to be sure */
1153 dev->mode_config.num_fb = 0;
1154 dev->mode_config.num_connector = 0;
1155 dev->mode_config.num_crtc = 0;
1156 dev->mode_config.num_encoder = 0;
1157 dev->mode_config.num_overlay_plane = 0;
1158 dev->mode_config.num_total_plane = 0;
1159 }
1160 EXPORT_SYMBOL(drm_mode_config_init);
1161
1162 /**
1163 * drm_mode_config_cleanup - free up DRM mode_config info
1164 * @dev: DRM device
1165 *
1166 * Free up all the connectors and CRTCs associated with this DRM device, then
1167 * free up the framebuffers and associated buffer objects.
1168 *
1169 * Note that since this /should/ happen single-threaded at driver/device
1170 * teardown time, no locking is required. It's the driver's job to ensure that
1171 * this guarantee actually holds true.
1172 *
1173 * FIXME: cleanup any dangling user buffer objects too
1174 */
drm_mode_config_cleanup(struct drm_device * dev)1175 void drm_mode_config_cleanup(struct drm_device *dev)
1176 {
1177 struct drm_connector *connector, *ot;
1178 struct drm_crtc *crtc, *ct;
1179 struct drm_encoder *encoder, *enct;
1180 struct drm_framebuffer *fb, *fbt;
1181 struct drm_property *property, *pt;
1182 struct drm_property_blob *blob, *bt;
1183 struct drm_plane *plane, *plt;
1184
1185 list_for_each_entry_safe(encoder, enct, &dev->mode_config.encoder_list,
1186 head) {
1187 encoder->funcs->destroy(encoder);
1188 }
1189
1190 list_for_each_entry_safe(connector, ot,
1191 &dev->mode_config.connector_list, head) {
1192 connector->funcs->destroy(connector);
1193 }
1194
1195 list_for_each_entry_safe(property, pt, &dev->mode_config.property_list,
1196 head) {
1197 drm_property_destroy(dev, property);
1198 }
1199
1200 list_for_each_entry_safe(plane, plt, &dev->mode_config.plane_list,
1201 head) {
1202 plane->funcs->destroy(plane);
1203 }
1204
1205 list_for_each_entry_safe(crtc, ct, &dev->mode_config.crtc_list, head) {
1206 crtc->funcs->destroy(crtc);
1207 }
1208
1209 list_for_each_entry_safe(blob, bt, &dev->mode_config.property_blob_list,
1210 head_global) {
1211 drm_property_unreference_blob(blob);
1212 }
1213
1214 /*
1215 * Single-threaded teardown context, so it's not required to grab the
1216 * fb_lock to protect against concurrent fb_list access. Contrary, it
1217 * would actually deadlock with the drm_framebuffer_cleanup function.
1218 *
1219 * Also, if there are any framebuffers left, that's a driver leak now,
1220 * so politely WARN about this.
1221 */
1222 WARN_ON(!list_empty(&dev->mode_config.fb_list));
1223 list_for_each_entry_safe(fb, fbt, &dev->mode_config.fb_list, head) {
1224 drm_framebuffer_free(&fb->base.refcount);
1225 }
1226
1227 ida_destroy(&dev->mode_config.connector_ida);
1228 idr_destroy(&dev->mode_config.tile_idr);
1229 idr_destroy(&dev->mode_config.crtc_idr);
1230 drm_modeset_lock_fini(&dev->mode_config.connection_mutex);
1231 }
1232 EXPORT_SYMBOL(drm_mode_config_cleanup);
1233
1234 /**
1235 * DOC: Tile group
1236 *
1237 * Tile groups are used to represent tiled monitors with a unique
1238 * integer identifier. Tiled monitors using DisplayID v1.3 have
1239 * a unique 8-byte handle, we store this in a tile group, so we
1240 * have a common identifier for all tiles in a monitor group.
1241 */
drm_tile_group_free(struct kref * kref)1242 static void drm_tile_group_free(struct kref *kref)
1243 {
1244 struct drm_tile_group *tg = container_of(kref, struct drm_tile_group, refcount);
1245 struct drm_device *dev = tg->dev;
1246 mutex_lock(&dev->mode_config.idr_mutex);
1247 idr_remove(&dev->mode_config.tile_idr, tg->id);
1248 mutex_unlock(&dev->mode_config.idr_mutex);
1249 kfree(tg);
1250 }
1251
1252 /**
1253 * drm_mode_put_tile_group - drop a reference to a tile group.
1254 * @dev: DRM device
1255 * @tg: tile group to drop reference to.
1256 *
1257 * drop reference to tile group and free if 0.
1258 */
drm_mode_put_tile_group(struct drm_device * dev,struct drm_tile_group * tg)1259 void drm_mode_put_tile_group(struct drm_device *dev,
1260 struct drm_tile_group *tg)
1261 {
1262 kref_put(&tg->refcount, drm_tile_group_free);
1263 }
1264
1265 /**
1266 * drm_mode_get_tile_group - get a reference to an existing tile group
1267 * @dev: DRM device
1268 * @topology: 8-bytes unique per monitor.
1269 *
1270 * Use the unique bytes to get a reference to an existing tile group.
1271 *
1272 * RETURNS:
1273 * tile group or NULL if not found.
1274 */
drm_mode_get_tile_group(struct drm_device * dev,char topology[8])1275 struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
1276 char topology[8])
1277 {
1278 struct drm_tile_group *tg;
1279 int id;
1280 mutex_lock(&dev->mode_config.idr_mutex);
1281 idr_for_each_entry(&dev->mode_config.tile_idr, tg, id) {
1282 if (!memcmp(tg->group_data, topology, 8)) {
1283 if (!kref_get_unless_zero(&tg->refcount))
1284 tg = NULL;
1285 mutex_unlock(&dev->mode_config.idr_mutex);
1286 return tg;
1287 }
1288 }
1289 mutex_unlock(&dev->mode_config.idr_mutex);
1290 return NULL;
1291 }
1292 EXPORT_SYMBOL(drm_mode_get_tile_group);
1293
1294 /**
1295 * drm_mode_create_tile_group - create a tile group from a displayid description
1296 * @dev: DRM device
1297 * @topology: 8-bytes unique per monitor.
1298 *
1299 * Create a tile group for the unique monitor, and get a unique
1300 * identifier for the tile group.
1301 *
1302 * RETURNS:
1303 * new tile group or error.
1304 */
drm_mode_create_tile_group(struct drm_device * dev,char topology[8])1305 struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
1306 char topology[8])
1307 {
1308 struct drm_tile_group *tg;
1309 int ret;
1310
1311 tg = kzalloc(sizeof(*tg), GFP_KERNEL);
1312 if (!tg)
1313 return ERR_PTR(-ENOMEM);
1314
1315 kref_init(&tg->refcount);
1316 memcpy(tg->group_data, topology, 8);
1317 tg->dev = dev;
1318
1319 mutex_lock(&dev->mode_config.idr_mutex);
1320 ret = idr_alloc(&dev->mode_config.tile_idr, tg, 1, 0, GFP_KERNEL);
1321 if (ret >= 0) {
1322 tg->id = ret;
1323 } else {
1324 kfree(tg);
1325 tg = ERR_PTR(ret);
1326 }
1327
1328 mutex_unlock(&dev->mode_config.idr_mutex);
1329 return tg;
1330 }
1331 EXPORT_SYMBOL(drm_mode_create_tile_group);
1332