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/dma-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_debugfs_crc.h>
45
46 #include "drm_crtc_internal.h"
47 #include "drm_internal.h"
48
49 /**
50 * DOC: overview
51 *
52 * A CRTC represents the overall display pipeline. It receives pixel data from
53 * &drm_plane and blends them together. The &drm_display_mode is also attached
54 * to the CRTC, specifying display timings. On the output side the data is fed
55 * to one or more &drm_encoder, which are then each connected to one
56 * &drm_connector.
57 *
58 * To create a CRTC, a KMS drivers allocates and zeroes an instances of
59 * &struct drm_crtc (possibly as part of a larger structure) and registers it
60 * with a call to drm_crtc_init_with_planes().
61 *
62 * The CRTC is also the entry point for legacy modeset operations, see
63 * &drm_crtc_funcs.set_config, legacy plane operations, see
64 * &drm_crtc_funcs.page_flip and &drm_crtc_funcs.cursor_set2, and other legacy
65 * operations like &drm_crtc_funcs.gamma_set. For atomic drivers all these
66 * features are controlled through &drm_property and
67 * &drm_mode_config_funcs.atomic_check and &drm_mode_config_funcs.atomic_check.
68 */
69
70 /**
71 * drm_crtc_from_index - find the registered CRTC at an index
72 * @dev: DRM device
73 * @idx: index of registered CRTC to find for
74 *
75 * Given a CRTC index, return the registered CRTC from DRM device's
76 * list of CRTCs with matching index. This is the inverse of drm_crtc_index().
77 * It's useful in the vblank callbacks (like &drm_driver.enable_vblank or
78 * &drm_driver.disable_vblank), since that still deals with indices instead
79 * of pointers to &struct drm_crtc."
80 */
drm_crtc_from_index(struct drm_device * dev,int idx)81 struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx)
82 {
83 struct drm_crtc *crtc;
84
85 drm_for_each_crtc(crtc, dev)
86 if (idx == crtc->index)
87 return crtc;
88
89 return NULL;
90 }
91 EXPORT_SYMBOL(drm_crtc_from_index);
92
93 /**
94 * drm_crtc_force_disable - Forcibly turn off a CRTC
95 * @crtc: CRTC to turn off
96 *
97 * Note: This should only be used by non-atomic legacy drivers.
98 *
99 * Returns:
100 * Zero on success, error code on failure.
101 */
drm_crtc_force_disable(struct drm_crtc * crtc)102 int drm_crtc_force_disable(struct drm_crtc *crtc)
103 {
104 struct drm_mode_set set = {
105 .crtc = crtc,
106 };
107
108 WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
109
110 return drm_mode_set_config_internal(&set);
111 }
112 EXPORT_SYMBOL(drm_crtc_force_disable);
113
114 /**
115 * drm_crtc_force_disable_all - Forcibly turn off all enabled CRTCs
116 * @dev: DRM device whose CRTCs to turn off
117 *
118 * Drivers may want to call this on unload to ensure that all displays are
119 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
120 *
121 * Note: This should only be used by non-atomic legacy drivers. For an atomic
122 * version look at drm_atomic_helper_shutdown().
123 *
124 * Returns:
125 * Zero on success, error code on failure.
126 */
drm_crtc_force_disable_all(struct drm_device * dev)127 int drm_crtc_force_disable_all(struct drm_device *dev)
128 {
129 struct drm_crtc *crtc;
130 int ret = 0;
131
132 drm_modeset_lock_all(dev);
133 drm_for_each_crtc(crtc, dev)
134 if (crtc->enabled) {
135 ret = drm_crtc_force_disable(crtc);
136 if (ret)
137 goto out;
138 }
139 out:
140 drm_modeset_unlock_all(dev);
141 return ret;
142 }
143 EXPORT_SYMBOL(drm_crtc_force_disable_all);
144
drm_num_crtcs(struct drm_device * dev)145 static unsigned int drm_num_crtcs(struct drm_device *dev)
146 {
147 unsigned int num = 0;
148 struct drm_crtc *tmp;
149
150 drm_for_each_crtc(tmp, dev) {
151 num++;
152 }
153
154 return num;
155 }
156
drm_crtc_register_all(struct drm_device * dev)157 int drm_crtc_register_all(struct drm_device *dev)
158 {
159 struct drm_crtc *crtc;
160 int ret = 0;
161
162 drm_for_each_crtc(crtc, dev) {
163 if (drm_debugfs_crtc_add(crtc))
164 DRM_ERROR("Failed to initialize debugfs entry for CRTC '%s'.\n",
165 crtc->name);
166
167 if (crtc->funcs->late_register)
168 ret = crtc->funcs->late_register(crtc);
169 if (ret)
170 return ret;
171 }
172
173 return 0;
174 }
175
drm_crtc_unregister_all(struct drm_device * dev)176 void drm_crtc_unregister_all(struct drm_device *dev)
177 {
178 struct drm_crtc *crtc;
179
180 drm_for_each_crtc(crtc, dev) {
181 if (crtc->funcs->early_unregister)
182 crtc->funcs->early_unregister(crtc);
183 drm_debugfs_crtc_remove(crtc);
184 }
185 }
186
drm_crtc_crc_init(struct drm_crtc * crtc)187 static int drm_crtc_crc_init(struct drm_crtc *crtc)
188 {
189 #ifdef CONFIG_DEBUG_FS
190 spin_lock_init(&crtc->crc.lock);
191 init_waitqueue_head(&crtc->crc.wq);
192 crtc->crc.source = kstrdup("auto", GFP_KERNEL);
193 if (!crtc->crc.source)
194 return -ENOMEM;
195 #endif
196 return 0;
197 }
198
drm_crtc_crc_fini(struct drm_crtc * crtc)199 static void drm_crtc_crc_fini(struct drm_crtc *crtc)
200 {
201 #ifdef CONFIG_DEBUG_FS
202 kfree(crtc->crc.source);
203 #endif
204 }
205
206 static const struct dma_fence_ops drm_crtc_fence_ops;
207
fence_to_crtc(struct dma_fence * fence)208 static struct drm_crtc *fence_to_crtc(struct dma_fence *fence)
209 {
210 BUG_ON(fence->ops != &drm_crtc_fence_ops);
211 return container_of(fence->lock, struct drm_crtc, fence_lock);
212 }
213
drm_crtc_fence_get_driver_name(struct dma_fence * fence)214 static const char *drm_crtc_fence_get_driver_name(struct dma_fence *fence)
215 {
216 struct drm_crtc *crtc = fence_to_crtc(fence);
217
218 return crtc->dev->driver->name;
219 }
220
drm_crtc_fence_get_timeline_name(struct dma_fence * fence)221 static const char *drm_crtc_fence_get_timeline_name(struct dma_fence *fence)
222 {
223 struct drm_crtc *crtc = fence_to_crtc(fence);
224
225 return crtc->timeline_name;
226 }
227
drm_crtc_fence_enable_signaling(struct dma_fence * fence)228 static bool drm_crtc_fence_enable_signaling(struct dma_fence *fence)
229 {
230 return true;
231 }
232
233 static const struct dma_fence_ops drm_crtc_fence_ops = {
234 .get_driver_name = drm_crtc_fence_get_driver_name,
235 .get_timeline_name = drm_crtc_fence_get_timeline_name,
236 .enable_signaling = drm_crtc_fence_enable_signaling,
237 .wait = dma_fence_default_wait,
238 };
239
drm_crtc_create_fence(struct drm_crtc * crtc)240 struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc)
241 {
242 struct dma_fence *fence;
243
244 fence = kzalloc(sizeof(*fence), GFP_KERNEL);
245 if (!fence)
246 return NULL;
247
248 dma_fence_init(fence, &drm_crtc_fence_ops, &crtc->fence_lock,
249 crtc->fence_context, ++crtc->fence_seqno);
250
251 return fence;
252 }
253
254 /**
255 * drm_crtc_init_with_planes - Initialise a new CRTC object with
256 * specified primary and cursor planes.
257 * @dev: DRM device
258 * @crtc: CRTC object to init
259 * @primary: Primary plane for CRTC
260 * @cursor: Cursor plane for CRTC
261 * @funcs: callbacks for the new CRTC
262 * @name: printf style format string for the CRTC name, or NULL for default name
263 *
264 * Inits a new object created as base part of a driver crtc object. Drivers
265 * should use this function instead of drm_crtc_init(), which is only provided
266 * for backwards compatibility with drivers which do not yet support universal
267 * planes). For really simple hardware which has only 1 plane look at
268 * drm_simple_display_pipe_init() instead.
269 *
270 * Returns:
271 * Zero on success, error code on failure.
272 */
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,...)273 int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
274 struct drm_plane *primary,
275 struct drm_plane *cursor,
276 const struct drm_crtc_funcs *funcs,
277 const char *name, ...)
278 {
279 struct drm_mode_config *config = &dev->mode_config;
280 int ret;
281
282 WARN_ON(primary && primary->type != DRM_PLANE_TYPE_PRIMARY);
283 WARN_ON(cursor && cursor->type != DRM_PLANE_TYPE_CURSOR);
284
285 crtc->dev = dev;
286 crtc->funcs = funcs;
287
288 INIT_LIST_HEAD(&crtc->commit_list);
289 lockinit(&crtc->commit_lock, "dccl", 0, 0);
290
291 drm_modeset_lock_init(&crtc->mutex);
292 ret = drm_mode_object_add(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
293 if (ret)
294 return ret;
295
296 if (name) {
297 va_list ap;
298
299 va_start(ap, name);
300 crtc->name = kvasprintf(GFP_KERNEL, name, ap);
301 va_end(ap);
302 } else {
303 crtc->name = kasprintf(GFP_KERNEL, "crtc-%d",
304 drm_num_crtcs(dev));
305 }
306 if (!crtc->name) {
307 drm_mode_object_unregister(dev, &crtc->base);
308 return -ENOMEM;
309 }
310
311 crtc->fence_context = dma_fence_context_alloc(1);
312 lockinit(&crtc->fence_lock, "drmcfl", 0, 0);
313 snprintf(crtc->timeline_name, sizeof(crtc->timeline_name),
314 "CRTC:%d-%s", crtc->base.id, crtc->name);
315
316 crtc->base.properties = &crtc->properties;
317
318 list_add_tail(&crtc->head, &config->crtc_list);
319 crtc->index = config->num_crtc++;
320
321 crtc->primary = primary;
322 crtc->cursor = cursor;
323 if (primary && !primary->possible_crtcs)
324 primary->possible_crtcs = 1 << drm_crtc_index(crtc);
325 if (cursor && !cursor->possible_crtcs)
326 cursor->possible_crtcs = 1 << drm_crtc_index(crtc);
327
328 ret = drm_crtc_crc_init(crtc);
329 if (ret) {
330 drm_mode_object_unregister(dev, &crtc->base);
331 return ret;
332 }
333
334 if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
335 drm_object_attach_property(&crtc->base, config->prop_active, 0);
336 drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
337 drm_object_attach_property(&crtc->base,
338 config->prop_out_fence_ptr, 0);
339 }
340
341 return 0;
342 }
343 EXPORT_SYMBOL(drm_crtc_init_with_planes);
344
345 /**
346 * drm_crtc_cleanup - Clean up the core crtc usage
347 * @crtc: CRTC to cleanup
348 *
349 * This function cleans up @crtc and removes it from the DRM mode setting
350 * core. Note that the function does *not* free the crtc structure itself,
351 * this is the responsibility of the caller.
352 */
drm_crtc_cleanup(struct drm_crtc * crtc)353 void drm_crtc_cleanup(struct drm_crtc *crtc)
354 {
355 struct drm_device *dev = crtc->dev;
356
357 /* Note that the crtc_list is considered to be static; should we
358 * remove the drm_crtc at runtime we would have to decrement all
359 * the indices on the drm_crtc after us in the crtc_list.
360 */
361
362 drm_crtc_crc_fini(crtc);
363
364 kfree(crtc->gamma_store);
365 crtc->gamma_store = NULL;
366
367 drm_modeset_lock_fini(&crtc->mutex);
368
369 drm_mode_object_unregister(dev, &crtc->base);
370 list_del(&crtc->head);
371 dev->mode_config.num_crtc--;
372
373 WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
374 if (crtc->state && crtc->funcs->atomic_destroy_state)
375 crtc->funcs->atomic_destroy_state(crtc, crtc->state);
376
377 kfree(crtc->name);
378
379 memset(crtc, 0, sizeof(*crtc));
380 }
381 EXPORT_SYMBOL(drm_crtc_cleanup);
382
383 /**
384 * drm_connector_index - find the index of a registered connector
385 * @connector: connector to find index for
386 *
387 * Given a registered connector, return the index of that connector within a DRM
388 * device's list of connectors.
389 */
drm_connector_index(struct drm_connector * connector)390 unsigned int drm_connector_index(struct drm_connector *connector)
391 {
392 unsigned int index = 0;
393 struct drm_connector *tmp;
394 struct drm_mode_config *config = &connector->dev->mode_config;
395 struct drm_connector_list_iter conn_iter;
396
397 WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
398
399 drm_connector_list_iter_begin(connector->dev, &conn_iter);
400 drm_for_each_connector_iter(tmp, &conn_iter) {
401 if (tmp == connector) {
402 drm_connector_list_iter_end(&conn_iter);
403 return index;
404 }
405
406 index++;
407 }
408 drm_connector_list_iter_end(&conn_iter);
409
410 BUG();
411 }
412 EXPORT_SYMBOL(drm_connector_index);
413
414 /**
415 * drm_mode_getcrtc - get CRTC configuration
416 * @dev: drm device for the ioctl
417 * @data: data pointer for the ioctl
418 * @file_priv: drm file for the ioctl call
419 *
420 * Construct a CRTC configuration structure to return to the user.
421 *
422 * Called by the user via ioctl.
423 *
424 * Returns:
425 * Zero on success, negative errno on failure.
426 */
drm_mode_getcrtc(struct drm_device * dev,void * data,struct drm_file * file_priv)427 int drm_mode_getcrtc(struct drm_device *dev,
428 void *data, struct drm_file *file_priv)
429 {
430 struct drm_mode_crtc *crtc_resp = data;
431 struct drm_crtc *crtc;
432
433 if (!drm_core_check_feature(dev, DRIVER_MODESET))
434 return -EINVAL;
435
436 crtc = drm_crtc_find(dev, file_priv, crtc_resp->crtc_id);
437 if (!crtc)
438 return -ENOENT;
439
440 crtc_resp->gamma_size = crtc->gamma_size;
441
442 drm_modeset_lock(&crtc->primary->mutex, NULL);
443 if (crtc->primary->state && crtc->primary->state->fb)
444 crtc_resp->fb_id = crtc->primary->state->fb->base.id;
445 else if (!crtc->primary->state && crtc->primary->fb)
446 crtc_resp->fb_id = crtc->primary->fb->base.id;
447 else
448 crtc_resp->fb_id = 0;
449
450 if (crtc->primary->state) {
451 crtc_resp->x = crtc->primary->state->src_x >> 16;
452 crtc_resp->y = crtc->primary->state->src_y >> 16;
453 }
454 drm_modeset_unlock(&crtc->primary->mutex);
455
456 drm_modeset_lock(&crtc->mutex, NULL);
457 if (crtc->state) {
458 if (crtc->state->enable) {
459 drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
460 crtc_resp->mode_valid = 1;
461
462 } else {
463 crtc_resp->mode_valid = 0;
464 }
465 } else {
466 crtc_resp->x = crtc->x;
467 crtc_resp->y = crtc->y;
468 if (crtc->enabled) {
469 drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->mode);
470 crtc_resp->mode_valid = 1;
471
472 } else {
473 crtc_resp->mode_valid = 0;
474 }
475 }
476 drm_modeset_unlock(&crtc->mutex);
477
478 return 0;
479 }
480
__drm_mode_set_config_internal(struct drm_mode_set * set,struct drm_modeset_acquire_ctx * ctx)481 static int __drm_mode_set_config_internal(struct drm_mode_set *set,
482 struct drm_modeset_acquire_ctx *ctx)
483 {
484 struct drm_crtc *crtc = set->crtc;
485 struct drm_framebuffer *fb;
486 struct drm_crtc *tmp;
487 int ret;
488
489 /*
490 * NOTE: ->set_config can also disable other crtcs (if we steal all
491 * connectors from it), hence we need to refcount the fbs across all
492 * crtcs. Atomic modeset will have saner semantics ...
493 */
494 drm_for_each_crtc(tmp, crtc->dev)
495 tmp->primary->old_fb = tmp->primary->fb;
496
497 fb = set->fb;
498
499 ret = crtc->funcs->set_config(set, ctx);
500 if (ret == 0) {
501 crtc->primary->crtc = crtc;
502 crtc->primary->fb = fb;
503 }
504
505 drm_for_each_crtc(tmp, crtc->dev) {
506 if (tmp->primary->fb)
507 drm_framebuffer_get(tmp->primary->fb);
508 if (tmp->primary->old_fb)
509 drm_framebuffer_put(tmp->primary->old_fb);
510 tmp->primary->old_fb = NULL;
511 }
512
513 return ret;
514 }
515 /**
516 * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config
517 * @set: modeset config to set
518 *
519 * This is a little helper to wrap internal calls to the
520 * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is
521 * correct refcounting dance.
522 *
523 * This should only be used by non-atomic legacy drivers.
524 *
525 * Returns:
526 * Zero on success, negative errno on failure.
527 */
drm_mode_set_config_internal(struct drm_mode_set * set)528 int drm_mode_set_config_internal(struct drm_mode_set *set)
529 {
530 WARN_ON(drm_drv_uses_atomic_modeset(set->crtc->dev));
531
532 return __drm_mode_set_config_internal(set, NULL);
533 }
534 EXPORT_SYMBOL(drm_mode_set_config_internal);
535
536 /**
537 * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
538 * CRTC viewport
539 * @crtc: CRTC that framebuffer will be displayed on
540 * @x: x panning
541 * @y: y panning
542 * @mode: mode that framebuffer will be displayed under
543 * @fb: framebuffer to check size of
544 */
drm_crtc_check_viewport(const struct drm_crtc * crtc,int x,int y,const struct drm_display_mode * mode,const struct drm_framebuffer * fb)545 int drm_crtc_check_viewport(const struct drm_crtc *crtc,
546 int x, int y,
547 const struct drm_display_mode *mode,
548 const struct drm_framebuffer *fb)
549
550 {
551 int hdisplay, vdisplay;
552
553 drm_mode_get_hv_timing(mode, &hdisplay, &vdisplay);
554
555 if (crtc->state &&
556 drm_rotation_90_or_270(crtc->primary->state->rotation))
557 swap(hdisplay, vdisplay);
558
559 return drm_framebuffer_check_src_coords(x << 16, y << 16,
560 hdisplay << 16, vdisplay << 16,
561 fb);
562 }
563 EXPORT_SYMBOL(drm_crtc_check_viewport);
564
565 /**
566 * drm_mode_setcrtc - set CRTC configuration
567 * @dev: drm device for the ioctl
568 * @data: data pointer for the ioctl
569 * @file_priv: drm file for the ioctl call
570 *
571 * Build a new CRTC configuration based on user request.
572 *
573 * Called by the user via ioctl.
574 *
575 * Returns:
576 * Zero on success, negative errno on failure.
577 */
drm_mode_setcrtc(struct drm_device * dev,void * data,struct drm_file * file_priv)578 int drm_mode_setcrtc(struct drm_device *dev, void *data,
579 struct drm_file *file_priv)
580 {
581 struct drm_mode_config *config = &dev->mode_config;
582 struct drm_mode_crtc *crtc_req = data;
583 struct drm_crtc *crtc;
584 struct drm_connector **connector_set = NULL, *connector;
585 struct drm_framebuffer *fb = NULL;
586 struct drm_display_mode *mode = NULL;
587 struct drm_mode_set set;
588 uint32_t __user *set_connectors_ptr;
589 struct drm_modeset_acquire_ctx ctx;
590 int ret;
591 int i;
592
593 if (!drm_core_check_feature(dev, DRIVER_MODESET))
594 return -EINVAL;
595
596 /*
597 * Universal plane src offsets are only 16.16, prevent havoc for
598 * drivers using universal plane code internally.
599 */
600 if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
601 return -ERANGE;
602
603 crtc = drm_crtc_find(dev, file_priv, crtc_req->crtc_id);
604 if (!crtc) {
605 DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
606 return -ENOENT;
607 }
608 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
609
610 mutex_lock(&crtc->dev->mode_config.mutex);
611 drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
612 retry:
613 ret = drm_modeset_lock_all_ctx(crtc->dev, &ctx);
614 if (ret)
615 goto out;
616 if (crtc_req->mode_valid) {
617 /* If we have a mode we need a framebuffer. */
618 /* If we pass -1, set the mode with the currently bound fb */
619 if (crtc_req->fb_id == -1) {
620 if (!crtc->primary->fb) {
621 DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
622 ret = -EINVAL;
623 goto out;
624 }
625 fb = crtc->primary->fb;
626 /* Make refcounting symmetric with the lookup path. */
627 drm_framebuffer_get(fb);
628 } else {
629 fb = drm_framebuffer_lookup(dev, file_priv, crtc_req->fb_id);
630 if (!fb) {
631 DRM_DEBUG_KMS("Unknown FB ID%d\n",
632 crtc_req->fb_id);
633 ret = -ENOENT;
634 goto out;
635 }
636 }
637
638 mode = drm_mode_create(dev);
639 if (!mode) {
640 ret = -ENOMEM;
641 goto out;
642 }
643
644 ret = drm_mode_convert_umode(mode, &crtc_req->mode);
645 if (ret) {
646 DRM_DEBUG_KMS("Invalid mode\n");
647 goto out;
648 }
649
650 /*
651 * Check whether the primary plane supports the fb pixel format.
652 * Drivers not implementing the universal planes API use a
653 * default formats list provided by the DRM core which doesn't
654 * match real hardware capabilities. Skip the check in that
655 * case.
656 */
657 if (!crtc->primary->format_default) {
658 ret = drm_plane_check_pixel_format(crtc->primary,
659 fb->format->format);
660 if (ret) {
661 struct drm_format_name_buf format_name;
662 DRM_DEBUG_KMS("Invalid pixel format %s\n",
663 drm_get_format_name(fb->format->format,
664 &format_name));
665 goto out;
666 }
667 }
668
669 ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
670 mode, fb);
671 if (ret)
672 goto out;
673
674 }
675
676 if (crtc_req->count_connectors == 0 && mode) {
677 DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
678 ret = -EINVAL;
679 goto out;
680 }
681
682 if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
683 DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
684 crtc_req->count_connectors);
685 ret = -EINVAL;
686 goto out;
687 }
688
689 if (crtc_req->count_connectors > 0) {
690 u32 out_id;
691
692 /* Avoid unbounded kernel memory allocation */
693 if (crtc_req->count_connectors > config->num_connector) {
694 ret = -EINVAL;
695 goto out;
696 }
697
698 connector_set = kmalloc_array(crtc_req->count_connectors,
699 sizeof(struct drm_connector *),
700 GFP_KERNEL);
701 if (!connector_set) {
702 ret = -ENOMEM;
703 goto out;
704 }
705
706 for (i = 0; i < crtc_req->count_connectors; i++) {
707 connector_set[i] = NULL;
708 set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
709 if (get_user(out_id, &set_connectors_ptr[i])) {
710 ret = -EFAULT;
711 goto out;
712 }
713
714 connector = drm_connector_lookup(dev, file_priv, out_id);
715 if (!connector) {
716 DRM_DEBUG_KMS("Connector id %d unknown\n",
717 out_id);
718 ret = -ENOENT;
719 goto out;
720 }
721 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
722 connector->base.id,
723 connector->name);
724
725 connector_set[i] = connector;
726 }
727 }
728
729 set.crtc = crtc;
730 set.x = crtc_req->x;
731 set.y = crtc_req->y;
732 set.mode = mode;
733 set.connectors = connector_set;
734 set.num_connectors = crtc_req->count_connectors;
735 set.fb = fb;
736 ret = __drm_mode_set_config_internal(&set, &ctx);
737
738 out:
739 if (fb)
740 drm_framebuffer_put(fb);
741
742 if (connector_set) {
743 for (i = 0; i < crtc_req->count_connectors; i++) {
744 if (connector_set[i])
745 drm_connector_put(connector_set[i]);
746 }
747 }
748 kfree(connector_set);
749 drm_mode_destroy(dev, mode);
750 if (ret == -EDEADLK) {
751 ret = drm_modeset_backoff(&ctx);
752 if (!ret)
753 goto retry;
754 }
755 drm_modeset_drop_locks(&ctx);
756 drm_modeset_acquire_fini(&ctx);
757 mutex_unlock(&crtc->dev->mode_config.mutex);
758
759 return ret;
760 }
761
drm_mode_crtc_set_obj_prop(struct drm_mode_object * obj,struct drm_property * property,uint64_t value)762 int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
763 struct drm_property *property,
764 uint64_t value)
765 {
766 int ret = -EINVAL;
767 struct drm_crtc *crtc = obj_to_crtc(obj);
768
769 if (crtc->funcs->set_property)
770 ret = crtc->funcs->set_property(crtc, property, value);
771 if (!ret)
772 drm_object_property_set_value(obj, property, value);
773
774 return ret;
775 }
776