drivers/gpu/drm/drm_mode_config.c

   1 /*
   2  * Copyright (c) 2016 Intel Corporation
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that copyright
   7  * notice and this permission notice appear in supporting documentation, and
   8  * that the name of the copyright holders not be used in advertising or
   9  * publicity pertaining to distribution of the software without specific,
  10  * written prior permission.  The copyright holders make no representations
  11  * about the suitability of this software for any purpose.  It is provided "as
  12  * is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  20  * OF THIS SOFTWARE.
  21  */
  22
  23 #include <linux/uaccess.h>
  24
  25 #include <drm/drm_drv.h>
  26 #include <drm/drm_encoder.h>
  27 #include <drm/drm_file.h>
  28 #include <drm/drm_framebuffer.h>
  29 #include <drm/drm_managed.h>
  30 #include <drm/drm_mode_config.h>
  31 #include <drm/drm_print.h>
  32 #include <linux/dma-resv.h>
  33
  34 #include "drm_crtc_internal.h"
  35 #include "drm_internal.h"
  36
  37 int drm_modeset_register_all(struct drm_device *dev)
  38 {
  39         int ret;
  40
  41         ret = drm_plane_register_all(dev);
  42         if (ret)
  43                 goto err_plane;
  44
  45         ret = drm_crtc_register_all(dev);
  46         if  (ret)
  47                 goto err_crtc;
  48
  49         ret = drm_encoder_register_all(dev);
  50         if (ret)
  51                 goto err_encoder;
  52
  53         ret = drm_connector_register_all(dev);
  54         if (ret)
  55                 goto err_connector;
  56
  57         return 0;
  58
  59 err_connector:
  60         drm_encoder_unregister_all(dev);
  61 err_encoder:
  62         drm_crtc_unregister_all(dev);
  63 err_crtc:
  64         drm_plane_unregister_all(dev);
  65 err_plane:
  66         return ret;
  67 }
  68
  69 void drm_modeset_unregister_all(struct drm_device *dev)
  70 {
  71         drm_connector_unregister_all(dev);
  72         drm_encoder_unregister_all(dev);
  73         drm_crtc_unregister_all(dev);
  74         drm_plane_unregister_all(dev);
  75 }
  76
  77 /**
  78  * drm_mode_getresources - get graphics configuration
  79  * @dev: drm device for the ioctl
  80  * @data: data pointer for the ioctl
  81  * @file_priv: drm file for the ioctl call
  82  *
  83  * Construct a set of configuration description structures and return
  84  * them to the user, including CRTC, connector and framebuffer configuration.
  85  *
  86  * Called by the user via ioctl.
  87  *
  88  * Returns:
  89  * Zero on success, negative errno on failure.
  90  */
  91 int drm_mode_getresources(struct drm_device *dev, void *data,
  92                           struct drm_file *file_priv)
  93 {
  94         struct drm_mode_card_res *card_res = data;
  95         struct drm_framebuffer *fb;
  96         struct drm_connector *connector;
  97         struct drm_crtc *crtc;
  98         struct drm_encoder *encoder;
  99         int count, ret = 0;
 100         uint32_t __user *fb_id;
 101         uint32_t __user *crtc_id;
 102         uint32_t __user *connector_id;
 103         uint32_t __user *encoder_id;
 104         struct drm_connector_list_iter conn_iter;
 105
 106         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 107                 return -EOPNOTSUPP;
 108
 109         mutex_lock(&file_priv->fbs_lock);
 110         count = 0;
 111         fb_id = u64_to_user_ptr(card_res->fb_id_ptr);
 112         list_for_each_entry(fb, &file_priv->fbs, filp_head) {
 113                 if (count < card_res->count_fbs &&
 114                     put_user(fb->base.id, fb_id + count)) {
 115                         mutex_unlock(&file_priv->fbs_lock);
 116                         return -EFAULT;
 117                 }
 118                 count++;
 119         }
 120         card_res->count_fbs = count;
 121         mutex_unlock(&file_priv->fbs_lock);
 122
 123         card_res->max_height = dev->mode_config.max_height;
 124         card_res->min_height = dev->mode_config.min_height;
 125         card_res->max_width = dev->mode_config.max_width;
 126         card_res->min_width = dev->mode_config.min_width;
 127
 128         count = 0;
 129         crtc_id = u64_to_user_ptr(card_res->crtc_id_ptr);
 130         drm_for_each_crtc(crtc, dev) {
 131                 if (drm_lease_held(file_priv, crtc->base.id)) {
 132                         if (count < card_res->count_crtcs &&
 133                             put_user(crtc->base.id, crtc_id + count))
 134                                 return -EFAULT;
 135                         count++;
 136                 }
 137         }
 138         card_res->count_crtcs = count;
 139
 140         count = 0;
 141         encoder_id = u64_to_user_ptr(card_res->encoder_id_ptr);
 142         drm_for_each_encoder(encoder, dev) {
 143                 if (count < card_res->count_encoders &&
 144                     put_user(encoder->base.id, encoder_id + count))
 145                         return -EFAULT;
 146                 count++;
 147         }
 148         card_res->count_encoders = count;
 149
 150         drm_connector_list_iter_begin(dev, &conn_iter);
 151         count = 0;
 152         connector_id = u64_to_user_ptr(card_res->connector_id_ptr);
 153         /*
 154          * FIXME: the connectors on the list may not be fully initialized yet,
 155          * if the ioctl is called before the connectors are registered. (See
 156          * drm_dev_register()->drm_modeset_register_all() for static and
 157          * drm_connector_dynamic_register() for dynamic connectors.)
 158          * The driver should only get registered after static connectors are
 159          * fully initialized and dynamic connectors should be added to the
 160          * connector list only after fully initializing them.
 161          */
 162         drm_for_each_connector_iter(connector, &conn_iter) {
 163                 /* only expose writeback connectors if userspace understands them */
 164                 if (!file_priv->writeback_connectors &&
 165                     (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK))
 166                         continue;
 167
 168                 if (drm_lease_held(file_priv, connector->base.id)) {
 169                         if (count < card_res->count_connectors &&
 170                             put_user(connector->base.id, connector_id + count)) {
 171                                 drm_connector_list_iter_end(&conn_iter);
 172                                 return -EFAULT;
 173                         }
 174                         count++;
 175                 }
 176         }
 177         card_res->count_connectors = count;
 178         drm_connector_list_iter_end(&conn_iter);
 179
 180         return ret;
 181 }
 182
 183 /**
 184  * drm_mode_config_reset - call ->reset callbacks
 185  * @dev: drm device
 186  *
 187  * This functions calls all the crtc's, encoder's and connector's ->reset
 188  * callback. Drivers can use this in e.g. their driver load or resume code to
 189  * reset hardware and software state.
 190  */
 191 void drm_mode_config_reset(struct drm_device *dev)
 192 {
 193         struct drm_crtc *crtc;
 194         struct drm_plane *plane;
 195         struct drm_encoder *encoder;
 196         struct drm_connector *connector;
 197         struct drm_connector_list_iter conn_iter;
 198
 199         drm_for_each_plane(plane, dev)
 200                 if (plane->funcs->reset)
 201                         plane->funcs->reset(plane);
 202
 203         drm_for_each_crtc(crtc, dev)
 204                 if (crtc->funcs->reset)
 205                         crtc->funcs->reset(crtc);
 206
 207         drm_for_each_encoder(encoder, dev)
 208                 if (encoder->funcs && encoder->funcs->reset)
 209                         encoder->funcs->reset(encoder);
 210
 211         drm_connector_list_iter_begin(dev, &conn_iter);
 212         drm_for_each_connector_iter(connector, &conn_iter)
 213                 if (connector->funcs->reset)
 214                         connector->funcs->reset(connector);
 215         drm_connector_list_iter_end(&conn_iter);
 216 }
 217 EXPORT_SYMBOL(drm_mode_config_reset);
 218
 219 /*
 220  * Global properties
 221  */
 222 static const struct drm_prop_enum_list drm_plane_type_enum_list[] = {
 223         { DRM_PLANE_TYPE_OVERLAY, "Overlay" },
 224         { DRM_PLANE_TYPE_PRIMARY, "Primary" },
 225         { DRM_PLANE_TYPE_CURSOR, "Cursor" },
 226 };
 227
 228 static int drm_mode_create_standard_properties(struct drm_device *dev)
 229 {
 230         struct drm_property *prop;
 231         int ret;
 232
 233         ret = drm_connector_create_standard_properties(dev);
 234         if (ret)
 235                 return ret;
 236
 237         prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
 238                                         "type", drm_plane_type_enum_list,
 239                                         ARRAY_SIZE(drm_plane_type_enum_list));
 240         if (!prop)
 241                 return -ENOMEM;
 242         dev->mode_config.plane_type_property = prop;
 243
 244         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 245                         "SRC_X", 0, UINT_MAX);
 246         if (!prop)
 247                 return -ENOMEM;
 248         dev->mode_config.prop_src_x = prop;
 249
 250         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 251                         "SRC_Y", 0, UINT_MAX);
 252         if (!prop)
 253                 return -ENOMEM;
 254         dev->mode_config.prop_src_y = prop;
 255
 256         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 257                         "SRC_W", 0, UINT_MAX);
 258         if (!prop)
 259                 return -ENOMEM;
 260         dev->mode_config.prop_src_w = prop;
 261
 262         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 263                         "SRC_H", 0, UINT_MAX);
 264         if (!prop)
 265                 return -ENOMEM;
 266         dev->mode_config.prop_src_h = prop;
 267
 268         prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
 269                         "CRTC_X", INT_MIN, INT_MAX);
 270         if (!prop)
 271                 return -ENOMEM;
 272         dev->mode_config.prop_crtc_x = prop;
 273
 274         prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
 275                         "CRTC_Y", INT_MIN, INT_MAX);
 276         if (!prop)
 277                 return -ENOMEM;
 278         dev->mode_config.prop_crtc_y = prop;
 279
 280         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 281                         "CRTC_W", 0, INT_MAX);
 282         if (!prop)
 283                 return -ENOMEM;
 284         dev->mode_config.prop_crtc_w = prop;
 285
 286         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 287                         "CRTC_H", 0, INT_MAX);
 288         if (!prop)
 289                 return -ENOMEM;
 290         dev->mode_config.prop_crtc_h = prop;
 291
 292         prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
 293                         "FB_ID", DRM_MODE_OBJECT_FB);
 294         if (!prop)
 295                 return -ENOMEM;
 296         dev->mode_config.prop_fb_id = prop;
 297
 298         prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
 299                         "IN_FENCE_FD", -1, INT_MAX);
 300         if (!prop)
 301                 return -ENOMEM;
 302         dev->mode_config.prop_in_fence_fd = prop;
 303
 304         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 305                         "OUT_FENCE_PTR", 0, U64_MAX);
 306         if (!prop)
 307                 return -ENOMEM;
 308         dev->mode_config.prop_out_fence_ptr = prop;
 309
 310         prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
 311                         "CRTC_ID", DRM_MODE_OBJECT_CRTC);
 312         if (!prop)
 313                 return -ENOMEM;
 314         dev->mode_config.prop_crtc_id = prop;
 315
 316         prop = drm_property_create(dev,
 317                         DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
 318                         "FB_DAMAGE_CLIPS", 0);
 319         if (!prop)
 320                 return -ENOMEM;
 321         dev->mode_config.prop_fb_damage_clips = prop;
 322
 323         prop = drm_property_create_bool(dev, DRM_MODE_PROP_ATOMIC,
 324                         "ACTIVE");
 325         if (!prop)
 326                 return -ENOMEM;
 327         dev->mode_config.prop_active = prop;
 328
 329         prop = drm_property_create(dev,
 330                         DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
 331                         "MODE_ID", 0);
 332         if (!prop)
 333                 return -ENOMEM;
 334         dev->mode_config.prop_mode_id = prop;
 335
 336         prop = drm_property_create_bool(dev, 0,
 337                         "VRR_ENABLED");
 338         if (!prop)
 339                 return -ENOMEM;
 340         dev->mode_config.prop_vrr_enabled = prop;
 341
 342         prop = drm_property_create(dev,
 343                         DRM_MODE_PROP_BLOB,
 344                         "DEGAMMA_LUT", 0);
 345         if (!prop)
 346                 return -ENOMEM;
 347         dev->mode_config.degamma_lut_property = prop;
 348
 349         prop = drm_property_create_range(dev,
 350                         DRM_MODE_PROP_IMMUTABLE,
 351                         "DEGAMMA_LUT_SIZE", 0, UINT_MAX);
 352         if (!prop)
 353                 return -ENOMEM;
 354         dev->mode_config.degamma_lut_size_property = prop;
 355
 356         prop = drm_property_create(dev,
 357                         DRM_MODE_PROP_BLOB,
 358                         "CTM", 0);
 359         if (!prop)
 360                 return -ENOMEM;
 361         dev->mode_config.ctm_property = prop;
 362
 363         prop = drm_property_create(dev,
 364                         DRM_MODE_PROP_BLOB,
 365                         "GAMMA_LUT", 0);
 366         if (!prop)
 367                 return -ENOMEM;
 368         dev->mode_config.gamma_lut_property = prop;
 369
 370         prop = drm_property_create_range(dev,
 371                         DRM_MODE_PROP_IMMUTABLE,
 372                         "GAMMA_LUT_SIZE", 0, UINT_MAX);
 373         if (!prop)
 374                 return -ENOMEM;
 375         dev->mode_config.gamma_lut_size_property = prop;
 376
 377         prop = drm_property_create(dev,
 378                                    DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_BLOB,
 379                                    "IN_FORMATS", 0);
 380         if (!prop)
 381                 return -ENOMEM;
 382         dev->mode_config.modifiers_property = prop;
 383
 384         prop = drm_property_create(dev,
 385                                    DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_BLOB,
 386                                    "SIZE_HINTS", 0);
 387         if (!prop)
 388                 return -ENOMEM;
 389         dev->mode_config.size_hints_property = prop;
 390
 391         return 0;
 392 }
 393
 394 static void drm_mode_config_init_release(struct drm_device *dev, void *ptr)
 395 {
 396         drm_mode_config_cleanup(dev);
 397 }
 398
 399 /**
 400  * drmm_mode_config_init - managed DRM mode_configuration structure
 401  *      initialization
 402  * @dev: DRM device
 403  *
 404  * Initialize @dev's mode_config structure, used for tracking the graphics
 405  * configuration of @dev.
 406  *
 407  * Since this initializes the modeset locks, no locking is possible. Which is no
 408  * problem, since this should happen single threaded at init time. It is the
 409  * driver's problem to ensure this guarantee.
 410  *
 411  * Cleanup is automatically handled through registering drm_mode_config_cleanup
 412  * with drmm_add_action().
 413  *
 414  * Returns: 0 on success, negative error value on failure.
 415  */
 416 int drmm_mode_config_init(struct drm_device *dev)
 417 {
 418         int ret;
 419
 420         mutex_init(&dev->mode_config.mutex);
 421         drm_modeset_lock_init(&dev->mode_config.connection_mutex);
 422         mutex_init(&dev->mode_config.idr_mutex);
 423         mutex_init(&dev->mode_config.fb_lock);
 424         mutex_init(&dev->mode_config.blob_lock);
 425         INIT_LIST_HEAD(&dev->mode_config.fb_list);
 426         INIT_LIST_HEAD(&dev->mode_config.crtc_list);
 427         INIT_LIST_HEAD(&dev->mode_config.connector_list);
 428         INIT_LIST_HEAD(&dev->mode_config.encoder_list);
 429         INIT_LIST_HEAD(&dev->mode_config.property_list);
 430         INIT_LIST_HEAD(&dev->mode_config.property_blob_list);
 431         INIT_LIST_HEAD(&dev->mode_config.plane_list);
 432         INIT_LIST_HEAD(&dev->mode_config.privobj_list);
 433         idr_init_base(&dev->mode_config.object_idr, 1);
 434         idr_init_base(&dev->mode_config.tile_idr, 1);
 435         ida_init(&dev->mode_config.connector_ida);
 436         spin_lock_init(&dev->mode_config.connector_list_lock);
 437
 438         init_llist_head(&dev->mode_config.connector_free_list);
 439         INIT_WORK(&dev->mode_config.connector_free_work, drm_connector_free_work_fn);
 440
 441         ret = drm_mode_create_standard_properties(dev);
 442         if (ret) {
 443                 drm_mode_config_cleanup(dev);
 444                 return ret;
 445         }
 446
 447         /* Just to be sure */
 448         dev->mode_config.num_fb = 0;
 449         dev->mode_config.num_connector = 0;
 450         dev->mode_config.num_crtc = 0;
 451         dev->mode_config.num_encoder = 0;
 452         dev->mode_config.num_total_plane = 0;
 453
 454         if (IS_ENABLED(CONFIG_LOCKDEP)) {
 455                 struct drm_modeset_acquire_ctx modeset_ctx;
 456                 struct ww_acquire_ctx resv_ctx;
 457                 struct dma_resv resv;
 458                 int ret;
 459
 460                 dma_resv_init(&resv);
 461
 462                 drm_modeset_acquire_init(&modeset_ctx, 0);
 463                 ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
 464                                        &modeset_ctx);
 465                 if (ret == -EDEADLK)
 466                         ret = drm_modeset_backoff(&modeset_ctx);
 467
 468                 might_fault();
 469
 470                 ww_acquire_init(&resv_ctx, &reservation_ww_class);
 471                 ret = dma_resv_lock(&resv, &resv_ctx);
 472                 if (ret == -EDEADLK)
 473                         dma_resv_lock_slow(&resv, &resv_ctx);
 474
 475                 dma_resv_unlock(&resv);
 476                 ww_acquire_fini(&resv_ctx);
 477
 478                 drm_modeset_drop_locks(&modeset_ctx);
 479                 drm_modeset_acquire_fini(&modeset_ctx);
 480                 dma_resv_fini(&resv);
 481         }
 482
 483         return drmm_add_action_or_reset(dev, drm_mode_config_init_release,
 484                                         NULL);
 485 }
 486 EXPORT_SYMBOL(drmm_mode_config_init);
 487
 488 /**
 489  * drm_mode_config_cleanup - free up DRM mode_config info
 490  * @dev: DRM device
 491  *
 492  * Free up all the connectors and CRTCs associated with this DRM device, then
 493  * free up the framebuffers and associated buffer objects.
 494  *
 495  * Note that since this /should/ happen single-threaded at driver/device
 496  * teardown time, no locking is required. It's the driver's job to ensure that
 497  * this guarantee actually holds true.
 498  *
 499  * FIXME: With the managed drmm_mode_config_init() it is no longer necessary for
 500  * drivers to explicitly call this function.
 501  */
 502 void drm_mode_config_cleanup(struct drm_device *dev)
 503 {
 504         struct drm_connector *connector;
 505         struct drm_connector_list_iter conn_iter;
 506         struct drm_crtc *crtc, *ct;
 507         struct drm_encoder *encoder, *enct;
 508         struct drm_framebuffer *fb, *fbt;
 509         struct drm_property *property, *pt;
 510         struct drm_property_blob *blob, *bt;
 511         struct drm_plane *plane, *plt;
 512
 513         list_for_each_entry_safe(encoder, enct, &dev->mode_config.encoder_list,
 514                                  head) {
 515                 encoder->funcs->destroy(encoder);
 516         }
 517
 518         drm_connector_list_iter_begin(dev, &conn_iter);
 519         drm_for_each_connector_iter(connector, &conn_iter) {
 520                 /* drm_connector_list_iter holds an full reference to the
 521                  * current connector itself, which means it is inherently safe
 522                  * against unreferencing the current connector - but not against
 523                  * deleting it right away. */
 524                 drm_connector_put(connector);
 525         }
 526         drm_connector_list_iter_end(&conn_iter);
 527         /* connector_iter drops references in a work item. */
 528         flush_work(&dev->mode_config.connector_free_work);
 529         if (WARN_ON(!list_empty(&dev->mode_config.connector_list))) {
 530                 drm_connector_list_iter_begin(dev, &conn_iter);
 531                 drm_for_each_connector_iter(connector, &conn_iter)
 532                         DRM_ERROR("connector %s leaked!\n", connector->name);
 533                 drm_connector_list_iter_end(&conn_iter);
 534         }
 535
 536         list_for_each_entry_safe(property, pt, &dev->mode_config.property_list,
 537                                  head) {
 538                 drm_property_destroy(dev, property);
 539         }
 540
 541         list_for_each_entry_safe(plane, plt, &dev->mode_config.plane_list,
 542                                  head) {
 543                 plane->funcs->destroy(plane);
 544         }
 545
 546         list_for_each_entry_safe(crtc, ct, &dev->mode_config.crtc_list, head) {
 547                 crtc->funcs->destroy(crtc);
 548         }
 549
 550         list_for_each_entry_safe(blob, bt, &dev->mode_config.property_blob_list,
 551                                  head_global) {
 552                 drm_property_blob_put(blob);
 553         }
 554
 555         /*
 556          * Single-threaded teardown context, so it's not required to grab the
 557          * fb_lock to protect against concurrent fb_list access. Contrary, it
 558          * would actually deadlock with the drm_framebuffer_cleanup function.
 559          *
 560          * Also, if there are any framebuffers left, that's a driver leak now,
 561          * so politely WARN about this.
 562          */
 563         WARN_ON(!list_empty(&dev->mode_config.fb_list));
 564         list_for_each_entry_safe(fb, fbt, &dev->mode_config.fb_list, head) {
 565                 struct drm_printer p = drm_dbg_printer(dev, DRM_UT_KMS, "[leaked fb]");
 566
 567                 drm_printf(&p, "framebuffer[%u]:\n", fb->base.id);
 568                 drm_framebuffer_print_info(&p, 1, fb);
 569                 drm_framebuffer_free(&fb->base.refcount);
 570         }
 571
 572         ida_destroy(&dev->mode_config.connector_ida);
 573         idr_destroy(&dev->mode_config.tile_idr);
 574         idr_destroy(&dev->mode_config.object_idr);
 575         drm_modeset_lock_fini(&dev->mode_config.connection_mutex);
 576 }
 577 EXPORT_SYMBOL(drm_mode_config_cleanup);
 578
 579 static u32 full_encoder_mask(struct drm_device *dev)
 580 {
 581         struct drm_encoder *encoder;
 582         u32 encoder_mask = 0;
 583
 584         drm_for_each_encoder(encoder, dev)
 585                 encoder_mask |= drm_encoder_mask(encoder);
 586
 587         return encoder_mask;
 588 }
 589
 590 /*
 591  * For some reason we want the encoder itself included in
 592  * possible_clones. Make life easy for drivers by allowing them
 593  * to leave possible_clones unset if no cloning is possible.
 594  */
 595 static void fixup_encoder_possible_clones(struct drm_encoder *encoder)
 596 {
 597         if (encoder->possible_clones == 0)
 598                 encoder->possible_clones = drm_encoder_mask(encoder);
 599 }
 600
 601 static void validate_encoder_possible_clones(struct drm_encoder *encoder)
 602 {
 603         struct drm_device *dev = encoder->dev;
 604         u32 encoder_mask = full_encoder_mask(dev);
 605         struct drm_encoder *other;
 606
 607         drm_for_each_encoder(other, dev) {
 608                 WARN(!!(encoder->possible_clones & drm_encoder_mask(other)) !=
 609                      !!(other->possible_clones & drm_encoder_mask(encoder)),
 610                      "possible_clones mismatch: "
 611                      "[ENCODER:%d:%s] mask=0x%x possible_clones=0x%x vs. "
 612                      "[ENCODER:%d:%s] mask=0x%x possible_clones=0x%x\n",
 613                      encoder->base.id, encoder->name,
 614                      drm_encoder_mask(encoder), encoder->possible_clones,
 615                      other->base.id, other->name,
 616                      drm_encoder_mask(other), other->possible_clones);
 617         }
 618
 619         WARN((encoder->possible_clones & drm_encoder_mask(encoder)) == 0 ||
 620              (encoder->possible_clones & ~encoder_mask) != 0,
 621              "Bogus possible_clones: "
 622              "[ENCODER:%d:%s] possible_clones=0x%x (full encoder mask=0x%x)\n",
 623              encoder->base.id, encoder->name,
 624              encoder->possible_clones, encoder_mask);
 625 }
 626
 627 static u32 full_crtc_mask(struct drm_device *dev)
 628 {
 629         struct drm_crtc *crtc;
 630         u32 crtc_mask = 0;
 631
 632         drm_for_each_crtc(crtc, dev)
 633                 crtc_mask |= drm_crtc_mask(crtc);
 634
 635         return crtc_mask;
 636 }
 637
 638 static void validate_encoder_possible_crtcs(struct drm_encoder *encoder)
 639 {
 640         u32 crtc_mask = full_crtc_mask(encoder->dev);
 641
 642         WARN((encoder->possible_crtcs & crtc_mask) == 0 ||
 643              (encoder->possible_crtcs & ~crtc_mask) != 0,
 644              "Bogus possible_crtcs: "
 645              "[ENCODER:%d:%s] possible_crtcs=0x%x (full crtc mask=0x%x)\n",
 646              encoder->base.id, encoder->name,
 647              encoder->possible_crtcs, crtc_mask);
 648 }
 649
 650 void drm_mode_config_validate(struct drm_device *dev)
 651 {
 652         struct drm_encoder *encoder;
 653         struct drm_crtc *crtc;
 654         struct drm_plane *plane;
 655         u32 primary_with_crtc = 0, cursor_with_crtc = 0;
 656         unsigned int num_primary = 0;
 657
 658         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 659                 return;
 660
 661         drm_for_each_encoder(encoder, dev)
 662                 fixup_encoder_possible_clones(encoder);
 663
 664         drm_for_each_encoder(encoder, dev) {
 665                 validate_encoder_possible_clones(encoder);
 666                 validate_encoder_possible_crtcs(encoder);
 667         }
 668
 669         drm_for_each_crtc(crtc, dev) {
 670                 WARN(!crtc->primary, "Missing primary plane on [CRTC:%d:%s]\n",
 671                      crtc->base.id, crtc->name);
 672
 673                 WARN(crtc->cursor && crtc->funcs->cursor_set,
 674                      "[CRTC:%d:%s] must not have both a cursor plane and a cursor_set func",
 675                      crtc->base.id, crtc->name);
 676                 WARN(crtc->cursor && crtc->funcs->cursor_set2,
 677                      "[CRTC:%d:%s] must not have both a cursor plane and a cursor_set2 func",
 678                      crtc->base.id, crtc->name);
 679                 WARN(crtc->cursor && crtc->funcs->cursor_move,
 680                      "[CRTC:%d:%s] must not have both a cursor plane and a cursor_move func",
 681                      crtc->base.id, crtc->name);
 682
 683                 if (crtc->primary) {
 684                         WARN(!(crtc->primary->possible_crtcs & drm_crtc_mask(crtc)),
 685                              "Bogus primary plane possible_crtcs: [PLANE:%d:%s] must be compatible with [CRTC:%d:%s]\n",
 686                              crtc->primary->base.id, crtc->primary->name,
 687                              crtc->base.id, crtc->name);
 688                         WARN(primary_with_crtc & drm_plane_mask(crtc->primary),
 689                              "Primary plane [PLANE:%d:%s] used for multiple CRTCs",
 690                              crtc->primary->base.id, crtc->primary->name);
 691                         primary_with_crtc |= drm_plane_mask(crtc->primary);
 692                 }
 693                 if (crtc->cursor) {
 694                         WARN(!(crtc->cursor->possible_crtcs & drm_crtc_mask(crtc)),
 695                              "Bogus cursor plane possible_crtcs: [PLANE:%d:%s] must be compatible with [CRTC:%d:%s]\n",
 696                              crtc->cursor->base.id, crtc->cursor->name,
 697                              crtc->base.id, crtc->name);
 698                         WARN(cursor_with_crtc & drm_plane_mask(crtc->cursor),
 699                              "Cursor plane [PLANE:%d:%s] used for multiple CRTCs",
 700                              crtc->cursor->base.id, crtc->cursor->name);
 701                         cursor_with_crtc |= drm_plane_mask(crtc->cursor);
 702                 }
 703         }
 704
 705         drm_for_each_plane(plane, dev) {
 706                 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
 707                         num_primary++;
 708         }
 709
 710         WARN(num_primary != dev->mode_config.num_crtc,
 711              "Must have as many primary planes as there are CRTCs, but have %u primary planes and %u CRTCs",
 712              num_primary, dev->mode_config.num_crtc);
 713 }