drivers/gpu/drm/drm_drv.c

   1 /*
   2  * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
   3  *
   4  * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
   5  * All Rights Reserved.
   6  *
   7  * Author Rickard E. (Rik) Faith <faith@valinux.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the next
  17  * paragraph) shall be included in all copies or substantial portions of the
  18  * Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  26  * DEALINGS IN THE SOFTWARE.
  27  */
  28
  29 #include <linux/debugfs.h>
  30 #include <linux/fs.h>
  31 #include <linux/module.h>
  32 #include <linux/moduleparam.h>
  33 #include <linux/mount.h>
  34 #include <linux/slab.h>
  35 #include <drm/drmP.h>
  36 #include <drm/drm_core.h>
  37 #include "drm_legacy.h"
  38 #include "drm_internal.h"
  39
  40 unsigned int drm_debug = 0;     /* 1 to enable debug output */
  41 EXPORT_SYMBOL(drm_debug);
  42
  43 bool drm_atomic = 0;
  44
  45 MODULE_AUTHOR(CORE_AUTHOR);
  46 MODULE_DESCRIPTION(CORE_DESC);
  47 MODULE_LICENSE("GPL and additional rights");
  48 MODULE_PARM_DESC(debug, "Enable debug output");
  49 MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)");
  50 MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
  51 MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
  52
  53 module_param_named(debug, drm_debug, int, 0600);
  54
  55 static DEFINE_SPINLOCK(drm_minor_lock);
  56 static struct idr drm_minors_idr;
  57
  58 struct class *drm_class;
  59 static struct dentry *drm_debugfs_root;
  60
  61 void drm_err(const char *format, ...)
  62 {
  63         struct va_format vaf;
  64         va_list args;
  65
  66         va_start(args, format);
  67
  68         vaf.fmt = format;
  69         vaf.va = &args;
  70
  71         printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
  72                __builtin_return_address(0), &vaf);
  73
  74         va_end(args);
  75 }
  76 EXPORT_SYMBOL(drm_err);
  77
  78 void drm_ut_debug_printk(const char *function_name, const char *format, ...)
  79 {
  80         struct va_format vaf;
  81         va_list args;
  82
  83         va_start(args, format);
  84         vaf.fmt = format;
  85         vaf.va = &args;
  86
  87         printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf);
  88
  89         va_end(args);
  90 }
  91 EXPORT_SYMBOL(drm_ut_debug_printk);
  92
  93 struct drm_master *drm_master_create(struct drm_minor *minor)
  94 {
  95         struct drm_master *master;
  96
  97         master = kzalloc(sizeof(*master), GFP_KERNEL);
  98         if (!master)
  99                 return NULL;
 100
 101         kref_init(&master->refcount);
 102         spin_lock_init(&master->lock.spinlock);
 103         init_waitqueue_head(&master->lock.lock_queue);
 104         idr_init(&master->magic_map);
 105         master->minor = minor;
 106
 107         return master;
 108 }
 109
 110 struct drm_master *drm_master_get(struct drm_master *master)
 111 {
 112         kref_get(&master->refcount);
 113         return master;
 114 }
 115 EXPORT_SYMBOL(drm_master_get);
 116
 117 static void drm_master_destroy(struct kref *kref)
 118 {
 119         struct drm_master *master = container_of(kref, struct drm_master, refcount);
 120         struct drm_device *dev = master->minor->dev;
 121         struct drm_map_list *r_list, *list_temp;
 122
 123         mutex_lock(&dev->struct_mutex);
 124         if (dev->driver->master_destroy)
 125                 dev->driver->master_destroy(dev, master);
 126
 127         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 128                 if (r_list->master == master) {
 129                         drm_legacy_rmmap_locked(dev, r_list->map);
 130                         r_list = NULL;
 131                 }
 132         }
 133         mutex_unlock(&dev->struct_mutex);
 134
 135         idr_destroy(&master->magic_map);
 136         kfree(master->unique);
 137         kfree(master);
 138 }
 139
 140 void drm_master_put(struct drm_master **master)
 141 {
 142         kref_put(&(*master)->refcount, drm_master_destroy);
 143         *master = NULL;
 144 }
 145 EXPORT_SYMBOL(drm_master_put);
 146
 147 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 148                         struct drm_file *file_priv)
 149 {
 150         int ret = 0;
 151
 152         mutex_lock(&dev->master_mutex);
 153         if (file_priv->is_master)
 154                 goto out_unlock;
 155
 156         if (file_priv->minor->master) {
 157                 ret = -EINVAL;
 158                 goto out_unlock;
 159         }
 160
 161         if (!file_priv->master) {
 162                 ret = -EINVAL;
 163                 goto out_unlock;
 164         }
 165
 166         file_priv->minor->master = drm_master_get(file_priv->master);
 167         file_priv->is_master = 1;
 168         if (dev->driver->master_set) {
 169                 ret = dev->driver->master_set(dev, file_priv, false);
 170                 if (unlikely(ret != 0)) {
 171                         file_priv->is_master = 0;
 172                         drm_master_put(&file_priv->minor->master);
 173                 }
 174         }
 175
 176 out_unlock:
 177         mutex_unlock(&dev->master_mutex);
 178         return ret;
 179 }
 180
 181 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
 182                          struct drm_file *file_priv)
 183 {
 184         int ret = -EINVAL;
 185
 186         mutex_lock(&dev->master_mutex);
 187         if (!file_priv->is_master)
 188                 goto out_unlock;
 189
 190         if (!file_priv->minor->master)
 191                 goto out_unlock;
 192
 193         ret = 0;
 194         if (dev->driver->master_drop)
 195                 dev->driver->master_drop(dev, file_priv, false);
 196         drm_master_put(&file_priv->minor->master);
 197         file_priv->is_master = 0;
 198
 199 out_unlock:
 200         mutex_unlock(&dev->master_mutex);
 201         return ret;
 202 }
 203
 204 /*
 205  * DRM Minors
 206  * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
 207  * of them is represented by a drm_minor object. Depending on the capabilities
 208  * of the device-driver, different interfaces are registered.
 209  *
 210  * Minors can be accessed via dev->$minor_name. This pointer is either
 211  * NULL or a valid drm_minor pointer and stays valid as long as the device is
 212  * valid. This means, DRM minors have the same life-time as the underlying
 213  * device. However, this doesn't mean that the minor is active. Minors are
 214  * registered and unregistered dynamically according to device-state.
 215  */
 216
 217 static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
 218                                              unsigned int type)
 219 {
 220         switch (type) {
 221         case DRM_MINOR_LEGACY:
 222                 return &dev->primary;
 223         case DRM_MINOR_RENDER:
 224                 return &dev->render;
 225         case DRM_MINOR_CONTROL:
 226                 return &dev->control;
 227         default:
 228                 return NULL;
 229         }
 230 }
 231
 232 static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
 233 {
 234         struct drm_minor *minor;
 235         unsigned long flags;
 236         int r;
 237
 238         minor = kzalloc(sizeof(*minor), GFP_KERNEL);
 239         if (!minor)
 240                 return -ENOMEM;
 241
 242         minor->type = type;
 243         minor->dev = dev;
 244
 245         idr_preload(GFP_KERNEL);
 246         spin_lock_irqsave(&drm_minor_lock, flags);
 247         r = idr_alloc(&drm_minors_idr,
 248                       NULL,
 249                       64 * type,
 250                       64 * (type + 1),
 251                       GFP_NOWAIT);
 252         spin_unlock_irqrestore(&drm_minor_lock, flags);
 253         idr_preload_end();
 254
 255         if (r < 0)
 256                 goto err_free;
 257
 258         minor->index = r;
 259
 260         minor->kdev = drm_sysfs_minor_alloc(minor);
 261         if (IS_ERR(minor->kdev)) {
 262                 r = PTR_ERR(minor->kdev);
 263                 goto err_index;
 264         }
 265
 266         *drm_minor_get_slot(dev, type) = minor;
 267         return 0;
 268
 269 err_index:
 270         spin_lock_irqsave(&drm_minor_lock, flags);
 271         idr_remove(&drm_minors_idr, minor->index);
 272         spin_unlock_irqrestore(&drm_minor_lock, flags);
 273 err_free:
 274         kfree(minor);
 275         return r;
 276 }
 277
 278 static void drm_minor_free(struct drm_device *dev, unsigned int type)
 279 {
 280         struct drm_minor **slot, *minor;
 281         unsigned long flags;
 282
 283         slot = drm_minor_get_slot(dev, type);
 284         minor = *slot;
 285         if (!minor)
 286                 return;
 287
 288         put_device(minor->kdev);
 289
 290         spin_lock_irqsave(&drm_minor_lock, flags);
 291         idr_remove(&drm_minors_idr, minor->index);
 292         spin_unlock_irqrestore(&drm_minor_lock, flags);
 293
 294         kfree(minor);
 295         *slot = NULL;
 296 }
 297
 298 static int drm_minor_register(struct drm_device *dev, unsigned int type)
 299 {
 300         struct drm_minor *minor;
 301         unsigned long flags;
 302         int ret;
 303
 304         DRM_DEBUG("\n");
 305
 306         minor = *drm_minor_get_slot(dev, type);
 307         if (!minor)
 308                 return 0;
 309
 310         ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root);
 311         if (ret) {
 312                 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
 313                 return ret;
 314         }
 315
 316         ret = device_add(minor->kdev);
 317         if (ret)
 318                 goto err_debugfs;
 319
 320         /* replace NULL with @minor so lookups will succeed from now on */
 321         spin_lock_irqsave(&drm_minor_lock, flags);
 322         idr_replace(&drm_minors_idr, minor, minor->index);
 323         spin_unlock_irqrestore(&drm_minor_lock, flags);
 324
 325         DRM_DEBUG("new minor registered %d\n", minor->index);
 326         return 0;
 327
 328 err_debugfs:
 329         drm_debugfs_cleanup(minor);
 330         return ret;
 331 }
 332
 333 static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
 334 {
 335         struct drm_minor *minor;
 336         unsigned long flags;
 337
 338         minor = *drm_minor_get_slot(dev, type);
 339         if (!minor || !device_is_registered(minor->kdev))
 340                 return;
 341
 342         /* replace @minor with NULL so lookups will fail from now on */
 343         spin_lock_irqsave(&drm_minor_lock, flags);
 344         idr_replace(&drm_minors_idr, NULL, minor->index);
 345         spin_unlock_irqrestore(&drm_minor_lock, flags);
 346
 347         device_del(minor->kdev);
 348         dev_set_drvdata(minor->kdev, NULL); /* safety belt */
 349         drm_debugfs_cleanup(minor);
 350 }
 351
 352 /**
 353  * drm_minor_acquire - Acquire a DRM minor
 354  * @minor_id: Minor ID of the DRM-minor
 355  *
 356  * Looks up the given minor-ID and returns the respective DRM-minor object. The
 357  * refence-count of the underlying device is increased so you must release this
 358  * object with drm_minor_release().
 359  *
 360  * As long as you hold this minor, it is guaranteed that the object and the
 361  * minor->dev pointer will stay valid! However, the device may get unplugged and
 362  * unregistered while you hold the minor.
 363  *
 364  * Returns:
 365  * Pointer to minor-object with increased device-refcount, or PTR_ERR on
 366  * failure.
 367  */
 368 struct drm_minor *drm_minor_acquire(unsigned int minor_id)
 369 {
 370         struct drm_minor *minor;
 371         unsigned long flags;
 372
 373         spin_lock_irqsave(&drm_minor_lock, flags);
 374         minor = idr_find(&drm_minors_idr, minor_id);
 375         if (minor)
 376                 drm_dev_ref(minor->dev);
 377         spin_unlock_irqrestore(&drm_minor_lock, flags);
 378
 379         if (!minor) {
 380                 return ERR_PTR(-ENODEV);
 381         } else if (drm_device_is_unplugged(minor->dev)) {
 382                 drm_dev_unref(minor->dev);
 383                 return ERR_PTR(-ENODEV);
 384         }
 385
 386         return minor;
 387 }
 388
 389 /**
 390  * drm_minor_release - Release DRM minor
 391  * @minor: Pointer to DRM minor object
 392  *
 393  * Release a minor that was previously acquired via drm_minor_acquire().
 394  */
 395 void drm_minor_release(struct drm_minor *minor)
 396 {
 397         drm_dev_unref(minor->dev);
 398 }
 399
 400 /**
 401  * drm_put_dev - Unregister and release a DRM device
 402  * @dev: DRM device
 403  *
 404  * Called at module unload time or when a PCI device is unplugged.
 405  *
 406  * Use of this function is discouraged. It will eventually go away completely.
 407  * Please use drm_dev_unregister() and drm_dev_unref() explicitly instead.
 408  *
 409  * Cleans up all DRM device, calling drm_lastclose().
 410  */
 411 void drm_put_dev(struct drm_device *dev)
 412 {
 413         DRM_DEBUG("\n");
 414
 415         if (!dev) {
 416                 DRM_ERROR("cleanup called no dev\n");
 417                 return;
 418         }
 419
 420         drm_dev_unregister(dev);
 421         drm_dev_unref(dev);
 422 }
 423 EXPORT_SYMBOL(drm_put_dev);
 424
 425 void drm_unplug_dev(struct drm_device *dev)
 426 {
 427         /* for a USB device */
 428         drm_minor_unregister(dev, DRM_MINOR_LEGACY);
 429         drm_minor_unregister(dev, DRM_MINOR_RENDER);
 430         drm_minor_unregister(dev, DRM_MINOR_CONTROL);
 431
 432         mutex_lock(&drm_global_mutex);
 433
 434         drm_device_set_unplugged(dev);
 435
 436         if (dev->open_count == 0) {
 437                 drm_put_dev(dev);
 438         }
 439         mutex_unlock(&drm_global_mutex);
 440 }
 441 EXPORT_SYMBOL(drm_unplug_dev);
 442
 443 /*
 444  * DRM internal mount
 445  * We want to be able to allocate our own "struct address_space" to control
 446  * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
 447  * stand-alone address_space objects, so we need an underlying inode. As there
 448  * is no way to allocate an independent inode easily, we need a fake internal
 449  * VFS mount-point.
 450  *
 451  * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
 452  * frees it again. You are allowed to use iget() and iput() to get references to
 453  * the inode. But each drm_fs_inode_new() call must be paired with exactly one
 454  * drm_fs_inode_free() call (which does not have to be the last iput()).
 455  * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
 456  * between multiple inode-users. You could, technically, call
 457  * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
 458  * iput(), but this way you'd end up with a new vfsmount for each inode.
 459  */
 460
 461 static int drm_fs_cnt;
 462 static struct vfsmount *drm_fs_mnt;
 463
 464 static const struct dentry_operations drm_fs_dops = {
 465         .d_dname        = simple_dname,
 466 };
 467
 468 static const struct super_operations drm_fs_sops = {
 469         .statfs         = simple_statfs,
 470 };
 471
 472 static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags,
 473                                    const char *dev_name, void *data)
 474 {
 475         return mount_pseudo(fs_type,
 476                             "drm:",
 477                             &drm_fs_sops,
 478                             &drm_fs_dops,
 479                             0x010203ff);
 480 }
 481
 482 static struct file_system_type drm_fs_type = {
 483         .name           = "drm",
 484         .owner          = THIS_MODULE,
 485         .mount          = drm_fs_mount,
 486         .kill_sb        = kill_anon_super,
 487 };
 488
 489 static struct inode *drm_fs_inode_new(void)
 490 {
 491         struct inode *inode;
 492         int r;
 493
 494         r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
 495         if (r < 0) {
 496                 DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
 497                 return ERR_PTR(r);
 498         }
 499
 500         inode = alloc_anon_inode(drm_fs_mnt->mnt_sb);
 501         if (IS_ERR(inode))
 502                 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
 503
 504         return inode;
 505 }
 506
 507 static void drm_fs_inode_free(struct inode *inode)
 508 {
 509         if (inode) {
 510                 iput(inode);
 511                 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
 512         }
 513 }
 514
 515 /**
 516  * drm_dev_alloc - Allocate new DRM device
 517  * @driver: DRM driver to allocate device for
 518  * @parent: Parent device object
 519  *
 520  * Allocate and initialize a new DRM device. No device registration is done.
 521  * Call drm_dev_register() to advertice the device to user space and register it
 522  * with other core subsystems.
 523  *
 524  * The initial ref-count of the object is 1. Use drm_dev_ref() and
 525  * drm_dev_unref() to take and drop further ref-counts.
 526  *
 527  * Note that for purely virtual devices @parent can be NULL.
 528  *
 529  * RETURNS:
 530  * Pointer to new DRM device, or NULL if out of memory.
 531  */
 532 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
 533                                  struct device *parent)
 534 {
 535         struct drm_device *dev;
 536         int ret;
 537
 538         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 539         if (!dev)
 540                 return NULL;
 541
 542         kref_init(&dev->ref);
 543         dev->dev = parent;
 544         dev->driver = driver;
 545
 546         INIT_LIST_HEAD(&dev->filelist);
 547         INIT_LIST_HEAD(&dev->ctxlist);
 548         INIT_LIST_HEAD(&dev->vmalist);
 549         INIT_LIST_HEAD(&dev->maplist);
 550         INIT_LIST_HEAD(&dev->vblank_event_list);
 551
 552         spin_lock_init(&dev->buf_lock);
 553         spin_lock_init(&dev->event_lock);
 554         mutex_init(&dev->struct_mutex);
 555         mutex_init(&dev->ctxlist_mutex);
 556         mutex_init(&dev->master_mutex);
 557
 558         dev->anon_inode = drm_fs_inode_new();
 559         if (IS_ERR(dev->anon_inode)) {
 560                 ret = PTR_ERR(dev->anon_inode);
 561                 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret);
 562                 goto err_free;
 563         }
 564
 565         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 566                 ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL);
 567                 if (ret)
 568                         goto err_minors;
 569         }
 570
 571         if (drm_core_check_feature(dev, DRIVER_RENDER)) {
 572                 ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
 573                 if (ret)
 574                         goto err_minors;
 575         }
 576
 577         ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY);
 578         if (ret)
 579                 goto err_minors;
 580
 581         if (drm_ht_create(&dev->map_hash, 12))
 582                 goto err_minors;
 583
 584         drm_legacy_ctxbitmap_init(dev);
 585
 586         if (drm_core_check_feature(dev, DRIVER_GEM)) {
 587                 ret = drm_gem_init(dev);
 588                 if (ret) {
 589                         DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
 590                         goto err_ctxbitmap;
 591                 }
 592         }
 593
 594         return dev;
 595
 596 err_ctxbitmap:
 597         drm_legacy_ctxbitmap_cleanup(dev);
 598         drm_ht_remove(&dev->map_hash);
 599 err_minors:
 600         drm_minor_free(dev, DRM_MINOR_LEGACY);
 601         drm_minor_free(dev, DRM_MINOR_RENDER);
 602         drm_minor_free(dev, DRM_MINOR_CONTROL);
 603         drm_fs_inode_free(dev->anon_inode);
 604 err_free:
 605         mutex_destroy(&dev->master_mutex);
 606         kfree(dev);
 607         return NULL;
 608 }
 609 EXPORT_SYMBOL(drm_dev_alloc);
 610
 611 static void drm_dev_release(struct kref *ref)
 612 {
 613         struct drm_device *dev = container_of(ref, struct drm_device, ref);
 614
 615         if (drm_core_check_feature(dev, DRIVER_GEM))
 616                 drm_gem_destroy(dev);
 617
 618         drm_legacy_ctxbitmap_cleanup(dev);
 619         drm_ht_remove(&dev->map_hash);
 620         drm_fs_inode_free(dev->anon_inode);
 621
 622         drm_minor_free(dev, DRM_MINOR_LEGACY);
 623         drm_minor_free(dev, DRM_MINOR_RENDER);
 624         drm_minor_free(dev, DRM_MINOR_CONTROL);
 625
 626         mutex_destroy(&dev->master_mutex);
 627         kfree(dev->unique);
 628         kfree(dev);
 629 }
 630
 631 /**
 632  * drm_dev_ref - Take reference of a DRM device
 633  * @dev: device to take reference of or NULL
 634  *
 635  * This increases the ref-count of @dev by one. You *must* already own a
 636  * reference when calling this. Use drm_dev_unref() to drop this reference
 637  * again.
 638  *
 639  * This function never fails. However, this function does not provide *any*
 640  * guarantee whether the device is alive or running. It only provides a
 641  * reference to the object and the memory associated with it.
 642  */
 643 void drm_dev_ref(struct drm_device *dev)
 644 {
 645         if (dev)
 646                 kref_get(&dev->ref);
 647 }
 648 EXPORT_SYMBOL(drm_dev_ref);
 649
 650 /**
 651  * drm_dev_unref - Drop reference of a DRM device
 652  * @dev: device to drop reference of or NULL
 653  *
 654  * This decreases the ref-count of @dev by one. The device is destroyed if the
 655  * ref-count drops to zero.
 656  */
 657 void drm_dev_unref(struct drm_device *dev)
 658 {
 659         if (dev)
 660                 kref_put(&dev->ref, drm_dev_release);
 661 }
 662 EXPORT_SYMBOL(drm_dev_unref);
 663
 664 /**
 665  * drm_dev_register - Register DRM device
 666  * @dev: Device to register
 667  * @flags: Flags passed to the driver's .load() function
 668  *
 669  * Register the DRM device @dev with the system, advertise device to user-space
 670  * and start normal device operation. @dev must be allocated via drm_dev_alloc()
 671  * previously.
 672  *
 673  * Never call this twice on any device!
 674  *
 675  * RETURNS:
 676  * 0 on success, negative error code on failure.
 677  */
 678 int drm_dev_register(struct drm_device *dev, unsigned long flags)
 679 {
 680         int ret;
 681
 682         mutex_lock(&drm_global_mutex);
 683
 684         ret = drm_minor_register(dev, DRM_MINOR_CONTROL);
 685         if (ret)
 686                 goto err_minors;
 687
 688         ret = drm_minor_register(dev, DRM_MINOR_RENDER);
 689         if (ret)
 690                 goto err_minors;
 691
 692         ret = drm_minor_register(dev, DRM_MINOR_LEGACY);
 693         if (ret)
 694                 goto err_minors;
 695
 696         if (dev->driver->load) {
 697                 ret = dev->driver->load(dev, flags);
 698                 if (ret)
 699                         goto err_minors;
 700         }
 701
 702         ret = 0;
 703         goto out_unlock;
 704
 705 err_minors:
 706         drm_minor_unregister(dev, DRM_MINOR_LEGACY);
 707         drm_minor_unregister(dev, DRM_MINOR_RENDER);
 708         drm_minor_unregister(dev, DRM_MINOR_CONTROL);
 709 out_unlock:
 710         mutex_unlock(&drm_global_mutex);
 711         return ret;
 712 }
 713 EXPORT_SYMBOL(drm_dev_register);
 714
 715 /**
 716  * drm_dev_unregister - Unregister DRM device
 717  * @dev: Device to unregister
 718  *
 719  * Unregister the DRM device from the system. This does the reverse of
 720  * drm_dev_register() but does not deallocate the device. The caller must call
 721  * drm_dev_unref() to drop their final reference.
 722  */
 723 void drm_dev_unregister(struct drm_device *dev)
 724 {
 725         struct drm_map_list *r_list, *list_temp;
 726
 727         drm_lastclose(dev);
 728
 729         if (dev->driver->unload)
 730                 dev->driver->unload(dev);
 731
 732         if (dev->agp)
 733                 drm_pci_agp_destroy(dev);
 734
 735         drm_vblank_cleanup(dev);
 736
 737         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
 738                 drm_legacy_rmmap(dev, r_list->map);
 739
 740         drm_minor_unregister(dev, DRM_MINOR_LEGACY);
 741         drm_minor_unregister(dev, DRM_MINOR_RENDER);
 742         drm_minor_unregister(dev, DRM_MINOR_CONTROL);
 743 }
 744 EXPORT_SYMBOL(drm_dev_unregister);
 745
 746 /**
 747  * drm_dev_set_unique - Set the unique name of a DRM device
 748  * @dev: device of which to set the unique name
 749  * @fmt: format string for unique name
 750  *
 751  * Sets the unique name of a DRM device using the specified format string and
 752  * a variable list of arguments. Drivers can use this at driver probe time if
 753  * the unique name of the devices they drive is static.
 754  *
 755  * Return: 0 on success or a negative error code on failure.
 756  */
 757 int drm_dev_set_unique(struct drm_device *dev, const char *fmt, ...)
 758 {
 759         va_list ap;
 760
 761         kfree(dev->unique);
 762
 763         va_start(ap, fmt);
 764         dev->unique = kvasprintf(GFP_KERNEL, fmt, ap);
 765         va_end(ap);
 766
 767         return dev->unique ? 0 : -ENOMEM;
 768 }
 769 EXPORT_SYMBOL(drm_dev_set_unique);
 770
 771 /*
 772  * DRM Core
 773  * The DRM core module initializes all global DRM objects and makes them
 774  * available to drivers. Once setup, drivers can probe their respective
 775  * devices.
 776  * Currently, core management includes:
 777  *  - The "DRM-Global" key/value database
 778  *  - Global ID management for connectors
 779  *  - DRM major number allocation
 780  *  - DRM minor management
 781  *  - DRM sysfs class
 782  *  - DRM debugfs root
 783  *
 784  * Furthermore, the DRM core provides dynamic char-dev lookups. For each
 785  * interface registered on a DRM device, you can request minor numbers from DRM
 786  * core. DRM core takes care of major-number management and char-dev
 787  * registration. A stub ->open() callback forwards any open() requests to the
 788  * registered minor.
 789  */
 790
 791 static int drm_stub_open(struct inode *inode, struct file *filp)
 792 {
 793         const struct file_operations *new_fops;
 794         struct drm_minor *minor;
 795         int err;
 796
 797         DRM_DEBUG("\n");
 798
 799         mutex_lock(&drm_global_mutex);
 800         minor = drm_minor_acquire(iminor(inode));
 801         if (IS_ERR(minor)) {
 802                 err = PTR_ERR(minor);
 803                 goto out_unlock;
 804         }
 805
 806         new_fops = fops_get(minor->dev->driver->fops);
 807         if (!new_fops) {
 808                 err = -ENODEV;
 809                 goto out_release;
 810         }
 811
 812         replace_fops(filp, new_fops);
 813         if (filp->f_op->open)
 814                 err = filp->f_op->open(inode, filp);
 815         else
 816                 err = 0;
 817
 818 out_release:
 819         drm_minor_release(minor);
 820 out_unlock:
 821         mutex_unlock(&drm_global_mutex);
 822         return err;
 823 }
 824
 825 static const struct file_operations drm_stub_fops = {
 826         .owner = THIS_MODULE,
 827         .open = drm_stub_open,
 828         .llseek = noop_llseek,
 829 };
 830
 831 static int __init drm_core_init(void)
 832 {
 833         int ret = -ENOMEM;
 834
 835         drm_global_init();
 836         drm_connector_ida_init();
 837         idr_init(&drm_minors_idr);
 838
 839         if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
 840                 goto err_p1;
 841
 842         drm_class = drm_sysfs_create(THIS_MODULE, "drm");
 843         if (IS_ERR(drm_class)) {
 844                 printk(KERN_ERR "DRM: Error creating drm class.\n");
 845                 ret = PTR_ERR(drm_class);
 846                 goto err_p2;
 847         }
 848
 849         drm_debugfs_root = debugfs_create_dir("dri", NULL);
 850         if (!drm_debugfs_root) {
 851                 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
 852                 ret = -1;
 853                 goto err_p3;
 854         }
 855
 856         DRM_INFO("Initialized %s %d.%d.%d %s\n",
 857                  CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
 858         return 0;
 859 err_p3:
 860         drm_sysfs_destroy();
 861 err_p2:
 862         unregister_chrdev(DRM_MAJOR, "drm");
 863
 864         idr_destroy(&drm_minors_idr);
 865 err_p1:
 866         return ret;
 867 }
 868
 869 static void __exit drm_core_exit(void)
 870 {
 871         debugfs_remove(drm_debugfs_root);
 872         drm_sysfs_destroy();
 873
 874         unregister_chrdev(DRM_MAJOR, "drm");
 875
 876         drm_connector_ida_destroy();
 877         idr_destroy(&drm_minors_idr);
 878 }
 879
 880 module_init(drm_core_init);
 881 module_exit(drm_core_exit);