drivers/gpu/drm/drm_crtc.c

   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  */
  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  */
 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  */
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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  */
 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 index is used with 32bit bitmasks */
 286         if (WARN_ON(config->num_crtc >= 32))
 287                 return -EINVAL;
 288
 289         crtc->dev = dev;
 290         crtc->funcs = funcs;
 291
 292         INIT_LIST_HEAD(&crtc->commit_list);
 293         spin_lock_init(&crtc->commit_lock);
 294
 295         drm_modeset_lock_init(&crtc->mutex);
 296         ret = drm_mode_object_add(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
 297         if (ret)
 298                 return ret;
 299
 300         if (name) {
 301                 va_list ap;
 302
 303                 va_start(ap, name);
 304                 crtc->name = kvasprintf(GFP_KERNEL, name, ap);
 305                 va_end(ap);
 306         } else {
 307                 crtc->name = kasprintf(GFP_KERNEL, "crtc-%d",
 308                                        drm_num_crtcs(dev));
 309         }
 310         if (!crtc->name) {
 311                 drm_mode_object_unregister(dev, &crtc->base);
 312                 return -ENOMEM;
 313         }
 314
 315         crtc->fence_context = dma_fence_context_alloc(1);
 316         spin_lock_init(&crtc->fence_lock);
 317         snprintf(crtc->timeline_name, sizeof(crtc->timeline_name),
 318                  "CRTC:%d-%s", crtc->base.id, crtc->name);
 319
 320         crtc->base.properties = &crtc->properties;
 321
 322         list_add_tail(&crtc->head, &config->crtc_list);
 323         crtc->index = config->num_crtc++;
 324
 325         crtc->primary = primary;
 326         crtc->cursor = cursor;
 327         if (primary && !primary->possible_crtcs)
 328                 primary->possible_crtcs = 1 << drm_crtc_index(crtc);
 329         if (cursor && !cursor->possible_crtcs)
 330                 cursor->possible_crtcs = 1 << drm_crtc_index(crtc);
 331
 332         ret = drm_crtc_crc_init(crtc);
 333         if (ret) {
 334                 drm_mode_object_unregister(dev, &crtc->base);
 335                 return ret;
 336         }
 337
 338         if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 339                 drm_object_attach_property(&crtc->base, config->prop_active, 0);
 340                 drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
 341                 drm_object_attach_property(&crtc->base,
 342                                            config->prop_out_fence_ptr, 0);
 343         }
 344
 345         return 0;
 346 }
 347 EXPORT_SYMBOL(drm_crtc_init_with_planes);
 348
 349 /**
 350  * drm_crtc_cleanup - Clean up the core crtc usage
 351  * @crtc: CRTC to cleanup
 352  *
 353  * This function cleans up @crtc and removes it from the DRM mode setting
 354  * core. Note that the function does *not* free the crtc structure itself,
 355  * this is the responsibility of the caller.
 356  */
 357 void drm_crtc_cleanup(struct drm_crtc *crtc)
 358 {
 359         struct drm_device *dev = crtc->dev;
 360
 361         /* Note that the crtc_list is considered to be static; should we
 362          * remove the drm_crtc at runtime we would have to decrement all
 363          * the indices on the drm_crtc after us in the crtc_list.
 364          */
 365
 366         drm_crtc_crc_fini(crtc);
 367
 368         kfree(crtc->gamma_store);
 369         crtc->gamma_store = NULL;
 370
 371         drm_modeset_lock_fini(&crtc->mutex);
 372
 373         drm_mode_object_unregister(dev, &crtc->base);
 374         list_del(&crtc->head);
 375         dev->mode_config.num_crtc--;
 376
 377         WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
 378         if (crtc->state && crtc->funcs->atomic_destroy_state)
 379                 crtc->funcs->atomic_destroy_state(crtc, crtc->state);
 380
 381         kfree(crtc->name);
 382
 383         memset(crtc, 0, sizeof(*crtc));
 384 }
 385 EXPORT_SYMBOL(drm_crtc_cleanup);
 386
 387 /**
 388  * drm_mode_getcrtc - get CRTC configuration
 389  * @dev: drm device for the ioctl
 390  * @data: data pointer for the ioctl
 391  * @file_priv: drm file for the ioctl call
 392  *
 393  * Construct a CRTC configuration structure to return to the user.
 394  *
 395  * Called by the user via ioctl.
 396  *
 397  * Returns:
 398  * Zero on success, negative errno on failure.
 399  */
 400 int drm_mode_getcrtc(struct drm_device *dev,
 401                      void *data, struct drm_file *file_priv)
 402 {
 403         struct drm_mode_crtc *crtc_resp = data;
 404         struct drm_crtc *crtc;
 405
 406         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 407                 return -EINVAL;
 408
 409         crtc = drm_crtc_find(dev, file_priv, crtc_resp->crtc_id);
 410         if (!crtc)
 411                 return -ENOENT;
 412
 413         crtc_resp->gamma_size = crtc->gamma_size;
 414
 415         drm_modeset_lock(&crtc->primary->mutex, NULL);
 416         if (crtc->primary->state && crtc->primary->state->fb)
 417                 crtc_resp->fb_id = crtc->primary->state->fb->base.id;
 418         else if (!crtc->primary->state && crtc->primary->fb)
 419                 crtc_resp->fb_id = crtc->primary->fb->base.id;
 420         else
 421                 crtc_resp->fb_id = 0;
 422
 423         if (crtc->primary->state) {
 424                 crtc_resp->x = crtc->primary->state->src_x >> 16;
 425                 crtc_resp->y = crtc->primary->state->src_y >> 16;
 426         }
 427         drm_modeset_unlock(&crtc->primary->mutex);
 428
 429         drm_modeset_lock(&crtc->mutex, NULL);
 430         if (crtc->state) {
 431                 if (crtc->state->enable) {
 432                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
 433                         crtc_resp->mode_valid = 1;
 434
 435                 } else {
 436                         crtc_resp->mode_valid = 0;
 437                 }
 438         } else {
 439                 crtc_resp->x = crtc->x;
 440                 crtc_resp->y = crtc->y;
 441                 if (crtc->enabled) {
 442                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->mode);
 443                         crtc_resp->mode_valid = 1;
 444
 445                 } else {
 446                         crtc_resp->mode_valid = 0;
 447                 }
 448         }
 449         drm_modeset_unlock(&crtc->mutex);
 450
 451         return 0;
 452 }
 453
 454 static int __drm_mode_set_config_internal(struct drm_mode_set *set,
 455                                           struct drm_modeset_acquire_ctx *ctx)
 456 {
 457         struct drm_crtc *crtc = set->crtc;
 458         struct drm_framebuffer *fb;
 459         struct drm_crtc *tmp;
 460         int ret;
 461
 462         /*
 463          * NOTE: ->set_config can also disable other crtcs (if we steal all
 464          * connectors from it), hence we need to refcount the fbs across all
 465          * crtcs. Atomic modeset will have saner semantics ...
 466          */
 467         drm_for_each_crtc(tmp, crtc->dev)
 468                 tmp->primary->old_fb = tmp->primary->fb;
 469
 470         fb = set->fb;
 471
 472         ret = crtc->funcs->set_config(set, ctx);
 473         if (ret == 0) {
 474                 crtc->primary->crtc = crtc;
 475                 crtc->primary->fb = fb;
 476         }
 477
 478         drm_for_each_crtc(tmp, crtc->dev) {
 479                 if (tmp->primary->fb)
 480                         drm_framebuffer_get(tmp->primary->fb);
 481                 if (tmp->primary->old_fb)
 482                         drm_framebuffer_put(tmp->primary->old_fb);
 483                 tmp->primary->old_fb = NULL;
 484         }
 485
 486         return ret;
 487 }
 488 /**
 489  * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config
 490  * @set: modeset config to set
 491  *
 492  * This is a little helper to wrap internal calls to the
 493  * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is
 494  * correct refcounting dance.
 495  *
 496  * This should only be used by non-atomic legacy drivers.
 497  *
 498  * Returns:
 499  * Zero on success, negative errno on failure.
 500  */
 501 int drm_mode_set_config_internal(struct drm_mode_set *set)
 502 {
 503         WARN_ON(drm_drv_uses_atomic_modeset(set->crtc->dev));
 504
 505         return __drm_mode_set_config_internal(set, NULL);
 506 }
 507 EXPORT_SYMBOL(drm_mode_set_config_internal);
 508
 509 /**
 510  * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
 511  *     CRTC viewport
 512  * @crtc: CRTC that framebuffer will be displayed on
 513  * @x: x panning
 514  * @y: y panning
 515  * @mode: mode that framebuffer will be displayed under
 516  * @fb: framebuffer to check size of
 517  */
 518 int drm_crtc_check_viewport(const struct drm_crtc *crtc,
 519                             int x, int y,
 520                             const struct drm_display_mode *mode,
 521                             const struct drm_framebuffer *fb)
 522
 523 {
 524         int hdisplay, vdisplay;
 525
 526         drm_mode_get_hv_timing(mode, &hdisplay, &vdisplay);
 527
 528         if (crtc->state &&
 529             drm_rotation_90_or_270(crtc->primary->state->rotation))
 530                 swap(hdisplay, vdisplay);
 531
 532         return drm_framebuffer_check_src_coords(x << 16, y << 16,
 533                                                 hdisplay << 16, vdisplay << 16,
 534                                                 fb);
 535 }
 536 EXPORT_SYMBOL(drm_crtc_check_viewport);
 537
 538 /**
 539  * drm_mode_setcrtc - set CRTC configuration
 540  * @dev: drm device for the ioctl
 541  * @data: data pointer for the ioctl
 542  * @file_priv: drm file for the ioctl call
 543  *
 544  * Build a new CRTC configuration based on user request.
 545  *
 546  * Called by the user via ioctl.
 547  *
 548  * Returns:
 549  * Zero on success, negative errno on failure.
 550  */
 551 int drm_mode_setcrtc(struct drm_device *dev, void *data,
 552                      struct drm_file *file_priv)
 553 {
 554         struct drm_mode_config *config = &dev->mode_config;
 555         struct drm_mode_crtc *crtc_req = data;
 556         struct drm_crtc *crtc;
 557         struct drm_connector **connector_set = NULL, *connector;
 558         struct drm_framebuffer *fb = NULL;
 559         struct drm_display_mode *mode = NULL;
 560         struct drm_mode_set set;
 561         uint32_t __user *set_connectors_ptr;
 562         struct drm_modeset_acquire_ctx ctx;
 563         int ret;
 564         int i;
 565
 566         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 567                 return -EINVAL;
 568
 569         /*
 570          * Universal plane src offsets are only 16.16, prevent havoc for
 571          * drivers using universal plane code internally.
 572          */
 573         if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
 574                 return -ERANGE;
 575
 576         crtc = drm_crtc_find(dev, file_priv, crtc_req->crtc_id);
 577         if (!crtc) {
 578                 DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
 579                 return -ENOENT;
 580         }
 581         DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
 582
 583         mutex_lock(&crtc->dev->mode_config.mutex);
 584         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
 585 retry:
 586         ret = drm_modeset_lock_all_ctx(crtc->dev, &ctx);
 587         if (ret)
 588                 goto out;
 589         if (crtc_req->mode_valid) {
 590                 /* If we have a mode we need a framebuffer. */
 591                 /* If we pass -1, set the mode with the currently bound fb */
 592                 if (crtc_req->fb_id == -1) {
 593                         if (!crtc->primary->fb) {
 594                                 DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
 595                                 ret = -EINVAL;
 596                                 goto out;
 597                         }
 598                         fb = crtc->primary->fb;
 599                         /* Make refcounting symmetric with the lookup path. */
 600                         drm_framebuffer_get(fb);
 601                 } else {
 602                         fb = drm_framebuffer_lookup(dev, file_priv, crtc_req->fb_id);
 603                         if (!fb) {
 604                                 DRM_DEBUG_KMS("Unknown FB ID%d\n",
 605                                                 crtc_req->fb_id);
 606                                 ret = -ENOENT;
 607                                 goto out;
 608                         }
 609                 }
 610
 611                 mode = drm_mode_create(dev);
 612                 if (!mode) {
 613                         ret = -ENOMEM;
 614                         goto out;
 615                 }
 616
 617                 ret = drm_mode_convert_umode(dev, mode, &crtc_req->mode);
 618                 if (ret) {
 619                         DRM_DEBUG_KMS("Invalid mode\n");
 620                         goto out;
 621                 }
 622
 623                 /*
 624                  * Check whether the primary plane supports the fb pixel format.
 625                  * Drivers not implementing the universal planes API use a
 626                  * default formats list provided by the DRM core which doesn't
 627                  * match real hardware capabilities. Skip the check in that
 628                  * case.
 629                  */
 630                 if (!crtc->primary->format_default) {
 631                         ret = drm_plane_check_pixel_format(crtc->primary,
 632                                                            fb->format->format,
 633                                                            fb->modifier);
 634                         if (ret) {
 635                                 struct drm_format_name_buf format_name;
 636                                 DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
 637                                               drm_get_format_name(fb->format->format,
 638                                                                   &format_name),
 639                                               fb->modifier);
 640                                 goto out;
 641                         }
 642                 }
 643
 644                 ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
 645                                               mode, fb);
 646                 if (ret)
 647                         goto out;
 648
 649         }
 650
 651         if (crtc_req->count_connectors == 0 && mode) {
 652                 DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
 653                 ret = -EINVAL;
 654                 goto out;
 655         }
 656
 657         if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
 658                 DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
 659                           crtc_req->count_connectors);
 660                 ret = -EINVAL;
 661                 goto out;
 662         }
 663
 664         if (crtc_req->count_connectors > 0) {
 665                 u32 out_id;
 666
 667                 /* Avoid unbounded kernel memory allocation */
 668                 if (crtc_req->count_connectors > config->num_connector) {
 669                         ret = -EINVAL;
 670                         goto out;
 671                 }
 672
 673                 connector_set = kmalloc_array(crtc_req->count_connectors,
 674                                               sizeof(struct drm_connector *),
 675                                               GFP_KERNEL);
 676                 if (!connector_set) {
 677                         ret = -ENOMEM;
 678                         goto out;
 679                 }
 680
 681                 for (i = 0; i < crtc_req->count_connectors; i++) {
 682                         connector_set[i] = NULL;
 683                         set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
 684                         if (get_user(out_id, &set_connectors_ptr[i])) {
 685                                 ret = -EFAULT;
 686                                 goto out;
 687                         }
 688
 689                         connector = drm_connector_lookup(dev, file_priv, out_id);
 690                         if (!connector) {
 691                                 DRM_DEBUG_KMS("Connector id %d unknown\n",
 692                                                 out_id);
 693                                 ret = -ENOENT;
 694                                 goto out;
 695                         }
 696                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 697                                         connector->base.id,
 698                                         connector->name);
 699
 700                         connector_set[i] = connector;
 701                 }
 702         }
 703
 704         set.crtc = crtc;
 705         set.x = crtc_req->x;
 706         set.y = crtc_req->y;
 707         set.mode = mode;
 708         set.connectors = connector_set;
 709         set.num_connectors = crtc_req->count_connectors;
 710         set.fb = fb;
 711         ret = __drm_mode_set_config_internal(&set, &ctx);
 712
 713 out:
 714         if (fb)
 715                 drm_framebuffer_put(fb);
 716
 717         if (connector_set) {
 718                 for (i = 0; i < crtc_req->count_connectors; i++) {
 719                         if (connector_set[i])
 720                                 drm_connector_put(connector_set[i]);
 721                 }
 722         }
 723         kfree(connector_set);
 724         drm_mode_destroy(dev, mode);
 725         if (ret == -EDEADLK) {
 726                 ret = drm_modeset_backoff(&ctx);
 727                 if (!ret)
 728                         goto retry;
 729         }
 730         drm_modeset_drop_locks(&ctx);
 731         drm_modeset_acquire_fini(&ctx);
 732         mutex_unlock(&crtc->dev->mode_config.mutex);
 733
 734         return ret;
 735 }
 736
 737 int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
 738                                struct drm_property *property,
 739                                uint64_t value)
 740 {
 741         int ret = -EINVAL;
 742         struct drm_crtc *crtc = obj_to_crtc(obj);
 743
 744         if (crtc->funcs->set_property)
 745                 ret = crtc->funcs->set_property(crtc, property, value);
 746         if (!ret)
 747                 drm_object_property_set_value(obj, property, value);
 748
 749         return ret;
 750 }