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 <drm/drm_encoder.h>
  24 #include <drm/drm_mode_config.h>
  25 #include <drm/drmP.h>
  26
  27 #include "drm_crtc_internal.h"
  28 #include "drm_internal.h"
  29
  30 int drm_modeset_register_all(struct drm_device *dev)
  31 {
  32         int ret;
  33
  34         ret = drm_plane_register_all(dev);
  35         if (ret)
  36                 goto err_plane;
  37
  38         ret = drm_crtc_register_all(dev);
  39         if  (ret)
  40                 goto err_crtc;
  41
  42         ret = drm_encoder_register_all(dev);
  43         if (ret)
  44                 goto err_encoder;
  45
  46         ret = drm_connector_register_all(dev);
  47         if (ret)
  48                 goto err_connector;
  49
  50         return 0;
  51
  52 err_connector:
  53         drm_encoder_unregister_all(dev);
  54 err_encoder:
  55         drm_crtc_unregister_all(dev);
  56 err_crtc:
  57         drm_plane_unregister_all(dev);
  58 err_plane:
  59         return ret;
  60 }
  61
  62 void drm_modeset_unregister_all(struct drm_device *dev)
  63 {
  64         drm_connector_unregister_all(dev);
  65         drm_encoder_unregister_all(dev);
  66         drm_crtc_unregister_all(dev);
  67         drm_plane_unregister_all(dev);
  68 }
  69
  70 /**
  71  * drm_mode_getresources - get graphics configuration
  72  * @dev: drm device for the ioctl
  73  * @data: data pointer for the ioctl
  74  * @file_priv: drm file for the ioctl call
  75  *
  76  * Construct a set of configuration description structures and return
  77  * them to the user, including CRTC, connector and framebuffer configuration.
  78  *
  79  * Called by the user via ioctl.
  80  *
  81  * Returns:
  82  * Zero on success, negative errno on failure.
  83  */
  84 int drm_mode_getresources(struct drm_device *dev, void *data,
  85                           struct drm_file *file_priv)
  86 {
  87         struct drm_mode_card_res *card_res = data;
  88         struct drm_framebuffer *fb;
  89         struct drm_connector *connector;
  90         struct drm_crtc *crtc;
  91         struct drm_encoder *encoder;
  92         int count, ret = 0;
  93         uint32_t __user *fb_id;
  94         uint32_t __user *crtc_id;
  95         uint32_t __user *connector_id;
  96         uint32_t __user *encoder_id;
  97         struct drm_connector_list_iter conn_iter;
  98
  99         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 100                 return -EINVAL;
 101
 102
 103         mutex_lock(&file_priv->fbs_lock);
 104         count = 0;
 105         fb_id = u64_to_user_ptr(card_res->fb_id_ptr);
 106         list_for_each_entry(fb, &file_priv->fbs, filp_head) {
 107                 if (count < card_res->count_fbs &&
 108                     put_user(fb->base.id, fb_id + count)) {
 109                         mutex_unlock(&file_priv->fbs_lock);
 110                         return -EFAULT;
 111                 }
 112                 count++;
 113         }
 114         card_res->count_fbs = count;
 115         mutex_unlock(&file_priv->fbs_lock);
 116
 117         card_res->max_height = dev->mode_config.max_height;
 118         card_res->min_height = dev->mode_config.min_height;
 119         card_res->max_width = dev->mode_config.max_width;
 120         card_res->min_width = dev->mode_config.min_width;
 121
 122         count = 0;
 123         crtc_id = u64_to_user_ptr(card_res->crtc_id_ptr);
 124         drm_for_each_crtc(crtc, dev) {
 125                 if (drm_lease_held(file_priv, crtc->base.id)) {
 126                         if (count < card_res->count_crtcs &&
 127                             put_user(crtc->base.id, crtc_id + count))
 128                                 return -EFAULT;
 129                         count++;
 130                 }
 131         }
 132         card_res->count_crtcs = count;
 133
 134         count = 0;
 135         encoder_id = u64_to_user_ptr(card_res->encoder_id_ptr);
 136         drm_for_each_encoder(encoder, dev) {
 137                 if (count < card_res->count_encoders &&
 138                     put_user(encoder->base.id, encoder_id + count))
 139                         return -EFAULT;
 140                 count++;
 141         }
 142         card_res->count_encoders = count;
 143
 144         drm_connector_list_iter_begin(dev, &conn_iter);
 145         count = 0;
 146         connector_id = u64_to_user_ptr(card_res->connector_id_ptr);
 147         drm_for_each_connector_iter(connector, &conn_iter) {
 148                 /* only expose writeback connectors if userspace understands them */
 149                 if (!file_priv->writeback_connectors &&
 150                     (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK))
 151                         continue;
 152
 153                 if (drm_lease_held(file_priv, connector->base.id)) {
 154                         if (count < card_res->count_connectors &&
 155                             put_user(connector->base.id, connector_id + count)) {
 156                                 drm_connector_list_iter_end(&conn_iter);
 157                                 return -EFAULT;
 158                         }
 159                         count++;
 160                 }
 161         }
 162         card_res->count_connectors = count;
 163         drm_connector_list_iter_end(&conn_iter);
 164
 165         return ret;
 166 }
 167
 168 /**
 169  * drm_mode_config_reset - call ->reset callbacks
 170  * @dev: drm device
 171  *
 172  * This functions calls all the crtc's, encoder's and connector's ->reset
 173  * callback. Drivers can use this in e.g. their driver load or resume code to
 174  * reset hardware and software state.
 175  */
 176 void drm_mode_config_reset(struct drm_device *dev)
 177 {
 178         struct drm_crtc *crtc;
 179         struct drm_plane *plane;
 180         struct drm_encoder *encoder;
 181         struct drm_connector *connector;
 182         struct drm_connector_list_iter conn_iter;
 183
 184         drm_for_each_plane(plane, dev)
 185                 if (plane->funcs->reset)
 186                         plane->funcs->reset(plane);
 187
 188         drm_for_each_crtc(crtc, dev)
 189                 if (crtc->funcs->reset)
 190                         crtc->funcs->reset(crtc);
 191
 192         drm_for_each_encoder(encoder, dev)
 193                 if (encoder->funcs->reset)
 194                         encoder->funcs->reset(encoder);
 195
 196         drm_connector_list_iter_begin(dev, &conn_iter);
 197         drm_for_each_connector_iter(connector, &conn_iter)
 198                 if (connector->funcs->reset)
 199                         connector->funcs->reset(connector);
 200         drm_connector_list_iter_end(&conn_iter);
 201 }
 202 EXPORT_SYMBOL(drm_mode_config_reset);
 203
 204 /*
 205  * Global properties
 206  */
 207 static const struct drm_prop_enum_list drm_plane_type_enum_list[] = {
 208         { DRM_PLANE_TYPE_OVERLAY, "Overlay" },
 209         { DRM_PLANE_TYPE_PRIMARY, "Primary" },
 210         { DRM_PLANE_TYPE_CURSOR, "Cursor" },
 211 };
 212
 213 static int drm_mode_create_standard_properties(struct drm_device *dev)
 214 {
 215         struct drm_property *prop;
 216         int ret;
 217
 218         ret = drm_connector_create_standard_properties(dev);
 219         if (ret)
 220                 return ret;
 221
 222         prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
 223                                         "type", drm_plane_type_enum_list,
 224                                         ARRAY_SIZE(drm_plane_type_enum_list));
 225         if (!prop)
 226                 return -ENOMEM;
 227         dev->mode_config.plane_type_property = prop;
 228
 229         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 230                         "SRC_X", 0, UINT_MAX);
 231         if (!prop)
 232                 return -ENOMEM;
 233         dev->mode_config.prop_src_x = prop;
 234
 235         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 236                         "SRC_Y", 0, UINT_MAX);
 237         if (!prop)
 238                 return -ENOMEM;
 239         dev->mode_config.prop_src_y = prop;
 240
 241         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 242                         "SRC_W", 0, UINT_MAX);
 243         if (!prop)
 244                 return -ENOMEM;
 245         dev->mode_config.prop_src_w = prop;
 246
 247         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 248                         "SRC_H", 0, UINT_MAX);
 249         if (!prop)
 250                 return -ENOMEM;
 251         dev->mode_config.prop_src_h = prop;
 252
 253         prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
 254                         "CRTC_X", INT_MIN, INT_MAX);
 255         if (!prop)
 256                 return -ENOMEM;
 257         dev->mode_config.prop_crtc_x = prop;
 258
 259         prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
 260                         "CRTC_Y", INT_MIN, INT_MAX);
 261         if (!prop)
 262                 return -ENOMEM;
 263         dev->mode_config.prop_crtc_y = prop;
 264
 265         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 266                         "CRTC_W", 0, INT_MAX);
 267         if (!prop)
 268                 return -ENOMEM;
 269         dev->mode_config.prop_crtc_w = prop;
 270
 271         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 272                         "CRTC_H", 0, INT_MAX);
 273         if (!prop)
 274                 return -ENOMEM;
 275         dev->mode_config.prop_crtc_h = prop;
 276
 277         prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
 278                         "FB_ID", DRM_MODE_OBJECT_FB);
 279         if (!prop)
 280                 return -ENOMEM;
 281         dev->mode_config.prop_fb_id = prop;
 282
 283         prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
 284                         "IN_FENCE_FD", -1, INT_MAX);
 285         if (!prop)
 286                 return -ENOMEM;
 287         dev->mode_config.prop_in_fence_fd = prop;
 288
 289         prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
 290                         "OUT_FENCE_PTR", 0, U64_MAX);
 291         if (!prop)
 292                 return -ENOMEM;
 293         dev->mode_config.prop_out_fence_ptr = prop;
 294
 295         prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
 296                         "CRTC_ID", DRM_MODE_OBJECT_CRTC);
 297         if (!prop)
 298                 return -ENOMEM;
 299         dev->mode_config.prop_crtc_id = prop;
 300
 301         prop = drm_property_create_bool(dev, DRM_MODE_PROP_ATOMIC,
 302                         "ACTIVE");
 303         if (!prop)
 304                 return -ENOMEM;
 305         dev->mode_config.prop_active = prop;
 306
 307         prop = drm_property_create(dev,
 308                         DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
 309                         "MODE_ID", 0);
 310         if (!prop)
 311                 return -ENOMEM;
 312         dev->mode_config.prop_mode_id = prop;
 313
 314         prop = drm_property_create(dev,
 315                         DRM_MODE_PROP_BLOB,
 316                         "DEGAMMA_LUT", 0);
 317         if (!prop)
 318                 return -ENOMEM;
 319         dev->mode_config.degamma_lut_property = prop;
 320
 321         prop = drm_property_create_range(dev,
 322                         DRM_MODE_PROP_IMMUTABLE,
 323                         "DEGAMMA_LUT_SIZE", 0, UINT_MAX);
 324         if (!prop)
 325                 return -ENOMEM;
 326         dev->mode_config.degamma_lut_size_property = prop;
 327
 328         prop = drm_property_create(dev,
 329                         DRM_MODE_PROP_BLOB,
 330                         "CTM", 0);
 331         if (!prop)
 332                 return -ENOMEM;
 333         dev->mode_config.ctm_property = prop;
 334
 335         prop = drm_property_create(dev,
 336                         DRM_MODE_PROP_BLOB,
 337                         "GAMMA_LUT", 0);
 338         if (!prop)
 339                 return -ENOMEM;
 340         dev->mode_config.gamma_lut_property = prop;
 341
 342         prop = drm_property_create_range(dev,
 343                         DRM_MODE_PROP_IMMUTABLE,
 344                         "GAMMA_LUT_SIZE", 0, UINT_MAX);
 345         if (!prop)
 346                 return -ENOMEM;
 347         dev->mode_config.gamma_lut_size_property = prop;
 348
 349         prop = drm_property_create(dev,
 350                                    DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_BLOB,
 351                                    "IN_FORMATS", 0);
 352         if (!prop)
 353                 return -ENOMEM;
 354         dev->mode_config.modifiers_property = prop;
 355
 356         return 0;
 357 }
 358
 359 /**
 360  * drm_mode_config_init - initialize DRM mode_configuration structure
 361  * @dev: DRM device
 362  *
 363  * Initialize @dev's mode_config structure, used for tracking the graphics
 364  * configuration of @dev.
 365  *
 366  * Since this initializes the modeset locks, no locking is possible. Which is no
 367  * problem, since this should happen single threaded at init time. It is the
 368  * driver's problem to ensure this guarantee.
 369  *
 370  */
 371 void drm_mode_config_init(struct drm_device *dev)
 372 {
 373         mutex_init(&dev->mode_config.mutex);
 374         drm_modeset_lock_init(&dev->mode_config.connection_mutex);
 375         mutex_init(&dev->mode_config.idr_mutex);
 376         mutex_init(&dev->mode_config.fb_lock);
 377         mutex_init(&dev->mode_config.blob_lock);
 378         INIT_LIST_HEAD(&dev->mode_config.fb_list);
 379         INIT_LIST_HEAD(&dev->mode_config.crtc_list);
 380         INIT_LIST_HEAD(&dev->mode_config.connector_list);
 381         INIT_LIST_HEAD(&dev->mode_config.encoder_list);
 382         INIT_LIST_HEAD(&dev->mode_config.property_list);
 383         INIT_LIST_HEAD(&dev->mode_config.property_blob_list);
 384         INIT_LIST_HEAD(&dev->mode_config.plane_list);
 385         idr_init(&dev->mode_config.crtc_idr);
 386         idr_init(&dev->mode_config.tile_idr);
 387         ida_init(&dev->mode_config.connector_ida);
 388         spin_lock_init(&dev->mode_config.connector_list_lock);
 389
 390         init_llist_head(&dev->mode_config.connector_free_list);
 391         INIT_WORK(&dev->mode_config.connector_free_work, drm_connector_free_work_fn);
 392
 393         drm_mode_create_standard_properties(dev);
 394
 395         /* Just to be sure */
 396         dev->mode_config.num_fb = 0;
 397         dev->mode_config.num_connector = 0;
 398         dev->mode_config.num_crtc = 0;
 399         dev->mode_config.num_encoder = 0;
 400         dev->mode_config.num_total_plane = 0;
 401 }
 402 EXPORT_SYMBOL(drm_mode_config_init);
 403
 404 /**
 405  * drm_mode_config_cleanup - free up DRM mode_config info
 406  * @dev: DRM device
 407  *
 408  * Free up all the connectors and CRTCs associated with this DRM device, then
 409  * free up the framebuffers and associated buffer objects.
 410  *
 411  * Note that since this /should/ happen single-threaded at driver/device
 412  * teardown time, no locking is required. It's the driver's job to ensure that
 413  * this guarantee actually holds true.
 414  *
 415  * FIXME: cleanup any dangling user buffer objects too
 416  */
 417 void drm_mode_config_cleanup(struct drm_device *dev)
 418 {
 419         struct drm_connector *connector;
 420         struct drm_connector_list_iter conn_iter;
 421         struct drm_crtc *crtc, *ct;
 422         struct drm_encoder *encoder, *enct;
 423         struct drm_framebuffer *fb, *fbt;
 424         struct drm_property *property, *pt;
 425         struct drm_property_blob *blob, *bt;
 426         struct drm_plane *plane, *plt;
 427
 428         list_for_each_entry_safe(encoder, enct, &dev->mode_config.encoder_list,
 429                                  head) {
 430                 encoder->funcs->destroy(encoder);
 431         }
 432
 433         drm_connector_list_iter_begin(dev, &conn_iter);
 434         drm_for_each_connector_iter(connector, &conn_iter) {
 435                 /* drm_connector_list_iter holds an full reference to the
 436                  * current connector itself, which means it is inherently safe
 437                  * against unreferencing the current connector - but not against
 438                  * deleting it right away. */
 439                 drm_connector_put(connector);
 440         }
 441         drm_connector_list_iter_end(&conn_iter);
 442         /* connector_iter drops references in a work item. */
 443         flush_work(&dev->mode_config.connector_free_work);
 444         if (WARN_ON(!list_empty(&dev->mode_config.connector_list))) {
 445                 drm_connector_list_iter_begin(dev, &conn_iter);
 446                 drm_for_each_connector_iter(connector, &conn_iter)
 447                         DRM_ERROR("connector %s leaked!\n", connector->name);
 448                 drm_connector_list_iter_end(&conn_iter);
 449         }
 450
 451         list_for_each_entry_safe(property, pt, &dev->mode_config.property_list,
 452                                  head) {
 453                 drm_property_destroy(dev, property);
 454         }
 455
 456         list_for_each_entry_safe(plane, plt, &dev->mode_config.plane_list,
 457                                  head) {
 458                 plane->funcs->destroy(plane);
 459         }
 460
 461         list_for_each_entry_safe(crtc, ct, &dev->mode_config.crtc_list, head) {
 462                 crtc->funcs->destroy(crtc);
 463         }
 464
 465         list_for_each_entry_safe(blob, bt, &dev->mode_config.property_blob_list,
 466                                  head_global) {
 467                 drm_property_blob_put(blob);
 468         }
 469
 470         /*
 471          * Single-threaded teardown context, so it's not required to grab the
 472          * fb_lock to protect against concurrent fb_list access. Contrary, it
 473          * would actually deadlock with the drm_framebuffer_cleanup function.
 474          *
 475          * Also, if there are any framebuffers left, that's a driver leak now,
 476          * so politely WARN about this.
 477          */
 478         WARN_ON(!list_empty(&dev->mode_config.fb_list));
 479         list_for_each_entry_safe(fb, fbt, &dev->mode_config.fb_list, head) {
 480                 struct drm_printer p = drm_debug_printer("[leaked fb]");
 481                 drm_printf(&p, "framebuffer[%u]:\n", fb->base.id);
 482                 drm_framebuffer_print_info(&p, 1, fb);
 483                 drm_framebuffer_free(&fb->base.refcount);
 484         }
 485
 486         ida_destroy(&dev->mode_config.connector_ida);
 487         idr_destroy(&dev->mode_config.tile_idr);
 488         idr_destroy(&dev->mode_config.crtc_idr);
 489         drm_modeset_lock_fini(&dev->mode_config.connection_mutex);
 490 }
 491 EXPORT_SYMBOL(drm_mode_config_cleanup);