drivers/gpu/drm/drm_stub.c

   1 /**
   2  * \file drm_stub.h
   3  * Stub support
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  */
   7
   8 /*
   9  * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
  10  *
  11  * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
  12  * All Rights Reserved.
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a
  15  * copy of this software and associated documentation files (the "Software"),
  16  * to deal in the Software without restriction, including without limitation
  17  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  18  * and/or sell copies of the Software, and to permit persons to whom the
  19  * Software is furnished to do so, subject to the following conditions:
  20  *
  21  * The above copyright notice and this permission notice (including the next
  22  * paragraph) shall be included in all copies or substantial portions of the
  23  * Software.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  26  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  27  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  28  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  29  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  30  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  31  * DEALINGS IN THE SOFTWARE.
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/slab.h>
  37 #include <drm/drmP.h>
  38 #include <drm/drm_core.h>
  39
  40 unsigned int drm_debug = 0;     /* 1 to enable debug output */
  41 EXPORT_SYMBOL(drm_debug);
  42
  43 unsigned int drm_rnodes = 0;    /* 1 to enable experimental render nodes API */
  44 EXPORT_SYMBOL(drm_rnodes);
  45
  46 unsigned int drm_vblank_offdelay = 5000;    /* Default to 5000 msecs. */
  47 EXPORT_SYMBOL(drm_vblank_offdelay);
  48
  49 unsigned int drm_timestamp_precision = 20;  /* Default to 20 usecs. */
  50 EXPORT_SYMBOL(drm_timestamp_precision);
  51
  52 /*
  53  * Default to use monotonic timestamps for wait-for-vblank and page-flip
  54  * complete events.
  55  */
  56 unsigned int drm_timestamp_monotonic = 1;
  57
  58 MODULE_AUTHOR(CORE_AUTHOR);
  59 MODULE_DESCRIPTION(CORE_DESC);
  60 MODULE_LICENSE("GPL and additional rights");
  61 MODULE_PARM_DESC(debug, "Enable debug output");
  62 MODULE_PARM_DESC(rnodes, "Enable experimental render nodes API");
  63 MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs]");
  64 MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
  65 MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");
  66
  67 module_param_named(debug, drm_debug, int, 0600);
  68 module_param_named(rnodes, drm_rnodes, int, 0600);
  69 module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
  70 module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
  71 module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
  72
  73 struct idr drm_minors_idr;
  74
  75 struct class *drm_class;
  76 struct dentry *drm_debugfs_root;
  77
  78 int drm_err(const char *func, const char *format, ...)
  79 {
  80         struct va_format vaf;
  81         va_list args;
  82         int r;
  83
  84         va_start(args, format);
  85
  86         vaf.fmt = format;
  87         vaf.va = &args;
  88
  89         r = printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* %pV", func, &vaf);
  90
  91         va_end(args);
  92
  93         return r;
  94 }
  95 EXPORT_SYMBOL(drm_err);
  96
  97 void drm_ut_debug_printk(unsigned int request_level,
  98                          const char *prefix,
  99                          const char *function_name,
 100                          const char *format, ...)
 101 {
 102         va_list args;
 103
 104         if (drm_debug & request_level) {
 105                 if (function_name)
 106                         printk(KERN_DEBUG "[%s:%s], ", prefix, function_name);
 107                 va_start(args, format);
 108                 vprintk(format, args);
 109                 va_end(args);
 110         }
 111 }
 112 EXPORT_SYMBOL(drm_ut_debug_printk);
 113
 114 static int drm_minor_get_id(struct drm_device *dev, int type)
 115 {
 116         int ret;
 117         int base = 0, limit = 63;
 118
 119         if (type == DRM_MINOR_CONTROL) {
 120                 base += 64;
 121                 limit = base + 63;
 122         } else if (type == DRM_MINOR_RENDER) {
 123                 base += 128;
 124                 limit = base + 63;
 125         }
 126
 127         mutex_lock(&dev->struct_mutex);
 128         ret = idr_alloc(&drm_minors_idr, NULL, base, limit, GFP_KERNEL);
 129         mutex_unlock(&dev->struct_mutex);
 130
 131         return ret == -ENOSPC ? -EINVAL : ret;
 132 }
 133
 134 struct drm_master *drm_master_create(struct drm_minor *minor)
 135 {
 136         struct drm_master *master;
 137
 138         master = kzalloc(sizeof(*master), GFP_KERNEL);
 139         if (!master)
 140                 return NULL;
 141
 142         kref_init(&master->refcount);
 143         spin_lock_init(&master->lock.spinlock);
 144         init_waitqueue_head(&master->lock.lock_queue);
 145         drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER);
 146         INIT_LIST_HEAD(&master->magicfree);
 147         master->minor = minor;
 148
 149         list_add_tail(&master->head, &minor->master_list);
 150
 151         return master;
 152 }
 153
 154 struct drm_master *drm_master_get(struct drm_master *master)
 155 {
 156         kref_get(&master->refcount);
 157         return master;
 158 }
 159 EXPORT_SYMBOL(drm_master_get);
 160
 161 static void drm_master_destroy(struct kref *kref)
 162 {
 163         struct drm_master *master = container_of(kref, struct drm_master, refcount);
 164         struct drm_magic_entry *pt, *next;
 165         struct drm_device *dev = master->minor->dev;
 166         struct drm_map_list *r_list, *list_temp;
 167
 168         list_del(&master->head);
 169
 170         if (dev->driver->master_destroy)
 171                 dev->driver->master_destroy(dev, master);
 172
 173         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 174                 if (r_list->master == master) {
 175                         drm_rmmap_locked(dev, r_list->map);
 176                         r_list = NULL;
 177                 }
 178         }
 179
 180         if (master->unique) {
 181                 kfree(master->unique);
 182                 master->unique = NULL;
 183                 master->unique_len = 0;
 184         }
 185
 186         kfree(dev->devname);
 187         dev->devname = NULL;
 188
 189         list_for_each_entry_safe(pt, next, &master->magicfree, head) {
 190                 list_del(&pt->head);
 191                 drm_ht_remove_item(&master->magiclist, &pt->hash_item);
 192                 kfree(pt);
 193         }
 194
 195         drm_ht_remove(&master->magiclist);
 196
 197         kfree(master);
 198 }
 199
 200 void drm_master_put(struct drm_master **master)
 201 {
 202         kref_put(&(*master)->refcount, drm_master_destroy);
 203         *master = NULL;
 204 }
 205 EXPORT_SYMBOL(drm_master_put);
 206
 207 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 208                         struct drm_file *file_priv)
 209 {
 210         int ret = 0;
 211
 212         if (file_priv->is_master)
 213                 return 0;
 214
 215         if (file_priv->minor->master && file_priv->minor->master != file_priv->master)
 216                 return -EINVAL;
 217
 218         if (!file_priv->master)
 219                 return -EINVAL;
 220
 221         if (file_priv->minor->master)
 222                 return -EINVAL;
 223
 224         mutex_lock(&dev->struct_mutex);
 225         file_priv->minor->master = drm_master_get(file_priv->master);
 226         file_priv->is_master = 1;
 227         if (dev->driver->master_set) {
 228                 ret = dev->driver->master_set(dev, file_priv, false);
 229                 if (unlikely(ret != 0)) {
 230                         file_priv->is_master = 0;
 231                         drm_master_put(&file_priv->minor->master);
 232                 }
 233         }
 234         mutex_unlock(&dev->struct_mutex);
 235
 236         return ret;
 237 }
 238
 239 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
 240                          struct drm_file *file_priv)
 241 {
 242         if (!file_priv->is_master)
 243                 return -EINVAL;
 244
 245         if (!file_priv->minor->master)
 246                 return -EINVAL;
 247
 248         mutex_lock(&dev->struct_mutex);
 249         if (dev->driver->master_drop)
 250                 dev->driver->master_drop(dev, file_priv, false);
 251         drm_master_put(&file_priv->minor->master);
 252         file_priv->is_master = 0;
 253         mutex_unlock(&dev->struct_mutex);
 254         return 0;
 255 }
 256
 257 /**
 258  * Get a secondary minor number.
 259  *
 260  * \param dev device data structure
 261  * \param sec-minor structure to hold the assigned minor
 262  * \return negative number on failure.
 263  *
 264  * Search an empty entry and initialize it to the given parameters. This
 265  * routines assigns minor numbers to secondary heads of multi-headed cards
 266  */
 267 int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type)
 268 {
 269         struct drm_minor *new_minor;
 270         int ret;
 271         int minor_id;
 272
 273         DRM_DEBUG("\n");
 274
 275         minor_id = drm_minor_get_id(dev, type);
 276         if (minor_id < 0)
 277                 return minor_id;
 278
 279         new_minor = kzalloc(sizeof(struct drm_minor), GFP_KERNEL);
 280         if (!new_minor) {
 281                 ret = -ENOMEM;
 282                 goto err_idr;
 283         }
 284
 285         new_minor->type = type;
 286         new_minor->device = MKDEV(DRM_MAJOR, minor_id);
 287         new_minor->dev = dev;
 288         new_minor->index = minor_id;
 289         INIT_LIST_HEAD(&new_minor->master_list);
 290
 291         idr_replace(&drm_minors_idr, new_minor, minor_id);
 292
 293 #if defined(CONFIG_DEBUG_FS)
 294         ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
 295         if (ret) {
 296                 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
 297                 goto err_mem;
 298         }
 299 #endif
 300
 301         ret = drm_sysfs_device_add(new_minor);
 302         if (ret) {
 303                 printk(KERN_ERR
 304                        "DRM: Error sysfs_device_add.\n");
 305                 goto err_debugfs;
 306         }
 307         *minor = new_minor;
 308
 309         DRM_DEBUG("new minor assigned %d\n", minor_id);
 310         return 0;
 311
 312
 313 err_debugfs:
 314 #if defined(CONFIG_DEBUG_FS)
 315         drm_debugfs_cleanup(new_minor);
 316 err_mem:
 317 #endif
 318         kfree(new_minor);
 319 err_idr:
 320         idr_remove(&drm_minors_idr, minor_id);
 321         *minor = NULL;
 322         return ret;
 323 }
 324 EXPORT_SYMBOL(drm_get_minor);
 325
 326 /**
 327  * Put a secondary minor number.
 328  *
 329  * \param sec_minor - structure to be released
 330  * \return always zero
 331  */
 332 int drm_put_minor(struct drm_minor **minor_p)
 333 {
 334         struct drm_minor *minor = *minor_p;
 335
 336         DRM_DEBUG("release secondary minor %d\n", minor->index);
 337
 338 #if defined(CONFIG_DEBUG_FS)
 339         drm_debugfs_cleanup(minor);
 340 #endif
 341
 342         drm_sysfs_device_remove(minor);
 343
 344         idr_remove(&drm_minors_idr, minor->index);
 345
 346         kfree(minor);
 347         *minor_p = NULL;
 348         return 0;
 349 }
 350 EXPORT_SYMBOL(drm_put_minor);
 351
 352 static void drm_unplug_minor(struct drm_minor *minor)
 353 {
 354         drm_sysfs_device_remove(minor);
 355 }
 356
 357 /**
 358  * Called via drm_exit() at module unload time or when pci device is
 359  * unplugged.
 360  *
 361  * Cleans up all DRM device, calling drm_lastclose().
 362  *
 363  */
 364 void drm_put_dev(struct drm_device *dev)
 365 {
 366         DRM_DEBUG("\n");
 367
 368         if (!dev) {
 369                 DRM_ERROR("cleanup called no dev\n");
 370                 return;
 371         }
 372
 373         drm_dev_unregister(dev);
 374         drm_dev_free(dev);
 375 }
 376 EXPORT_SYMBOL(drm_put_dev);
 377
 378 void drm_unplug_dev(struct drm_device *dev)
 379 {
 380         /* for a USB device */
 381         if (drm_core_check_feature(dev, DRIVER_MODESET))
 382                 drm_unplug_minor(dev->control);
 383         if (dev->render)
 384                 drm_unplug_minor(dev->render);
 385         drm_unplug_minor(dev->primary);
 386
 387         mutex_lock(&drm_global_mutex);
 388
 389         drm_device_set_unplugged(dev);
 390
 391         if (dev->open_count == 0) {
 392                 drm_put_dev(dev);
 393         }
 394         mutex_unlock(&drm_global_mutex);
 395 }
 396 EXPORT_SYMBOL(drm_unplug_dev);
 397
 398 /**
 399  * drm_dev_alloc - Allocate new drm device
 400  * @driver: DRM driver to allocate device for
 401  * @parent: Parent device object
 402  *
 403  * Allocate and initialize a new DRM device. No device registration is done.
 404  * Call drm_dev_register() to advertice the device to user space and register it
 405  * with other core subsystems.
 406  *
 407  * RETURNS:
 408  * Pointer to new DRM device, or NULL if out of memory.
 409  */
 410 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
 411                                  struct device *parent)
 412 {
 413         struct drm_device *dev;
 414         int ret;
 415
 416         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 417         if (!dev)
 418                 return NULL;
 419
 420         dev->dev = parent;
 421         dev->driver = driver;
 422
 423         INIT_LIST_HEAD(&dev->filelist);
 424         INIT_LIST_HEAD(&dev->ctxlist);
 425         INIT_LIST_HEAD(&dev->vmalist);
 426         INIT_LIST_HEAD(&dev->maplist);
 427         INIT_LIST_HEAD(&dev->vblank_event_list);
 428
 429         spin_lock_init(&dev->count_lock);
 430         spin_lock_init(&dev->event_lock);
 431         mutex_init(&dev->struct_mutex);
 432         mutex_init(&dev->ctxlist_mutex);
 433
 434         /* the DRM has 6 basic counters */
 435         dev->counters = 6;
 436         dev->types[0] = _DRM_STAT_LOCK;
 437         dev->types[1] = _DRM_STAT_OPENS;
 438         dev->types[2] = _DRM_STAT_CLOSES;
 439         dev->types[3] = _DRM_STAT_IOCTLS;
 440         dev->types[4] = _DRM_STAT_LOCKS;
 441         dev->types[5] = _DRM_STAT_UNLOCKS;
 442
 443         if (drm_ht_create(&dev->map_hash, 12))
 444                 goto err_free;
 445
 446         ret = drm_ctxbitmap_init(dev);
 447         if (ret) {
 448                 DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 449                 goto err_ht;
 450         }
 451
 452         if (driver->driver_features & DRIVER_GEM) {
 453                 ret = drm_gem_init(dev);
 454                 if (ret) {
 455                         DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
 456                         goto err_ctxbitmap;
 457                 }
 458         }
 459
 460         return dev;
 461
 462 err_ctxbitmap:
 463         drm_ctxbitmap_cleanup(dev);
 464 err_ht:
 465         drm_ht_remove(&dev->map_hash);
 466 err_free:
 467         kfree(dev);
 468         return NULL;
 469 }
 470 EXPORT_SYMBOL(drm_dev_alloc);
 471
 472 /**
 473  * drm_dev_free - Free DRM device
 474  * @dev: DRM device to free
 475  *
 476  * Free a DRM device that has previously been allocated via drm_dev_alloc().
 477  * You must not use kfree() instead or you will leak memory.
 478  *
 479  * This must not be called once the device got registered. Use drm_put_dev()
 480  * instead, which then calls drm_dev_free().
 481  */
 482 void drm_dev_free(struct drm_device *dev)
 483 {
 484         if (dev->driver->driver_features & DRIVER_GEM)
 485                 drm_gem_destroy(dev);
 486
 487         drm_ctxbitmap_cleanup(dev);
 488         drm_ht_remove(&dev->map_hash);
 489
 490         kfree(dev->devname);
 491         kfree(dev);
 492 }
 493 EXPORT_SYMBOL(drm_dev_free);
 494
 495 /**
 496  * drm_dev_register - Register DRM device
 497  * @dev: Device to register
 498  *
 499  * Register the DRM device @dev with the system, advertise device to user-space
 500  * and start normal device operation. @dev must be allocated via drm_dev_alloc()
 501  * previously.
 502  *
 503  * Never call this twice on any device!
 504  *
 505  * RETURNS:
 506  * 0 on success, negative error code on failure.
 507  */
 508 int drm_dev_register(struct drm_device *dev, unsigned long flags)
 509 {
 510         int ret;
 511
 512         mutex_lock(&drm_global_mutex);
 513
 514         if (dev->driver->bus->agp_init) {
 515                 ret = dev->driver->bus->agp_init(dev);
 516                 if (ret)
 517                         goto out_unlock;
 518         }
 519
 520         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 521                 ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
 522                 if (ret)
 523                         goto err_agp;
 524         }
 525
 526         if (drm_core_check_feature(dev, DRIVER_RENDER) && drm_rnodes) {
 527                 ret = drm_get_minor(dev, &dev->render, DRM_MINOR_RENDER);
 528                 if (ret)
 529                         goto err_control_node;
 530         }
 531
 532         ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
 533         if (ret)
 534                 goto err_render_node;
 535
 536         if (dev->driver->load) {
 537                 ret = dev->driver->load(dev, flags);
 538                 if (ret)
 539                         goto err_primary_node;
 540         }
 541
 542         /* setup grouping for legacy outputs */
 543         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 544                 ret = drm_mode_group_init_legacy_group(dev,
 545                                 &dev->primary->mode_group);
 546                 if (ret)
 547                         goto err_unload;
 548         }
 549
 550         list_add_tail(&dev->driver_item, &dev->driver->device_list);
 551
 552         ret = 0;
 553         goto out_unlock;
 554
 555 err_unload:
 556         if (dev->driver->unload)
 557                 dev->driver->unload(dev);
 558 err_primary_node:
 559         drm_put_minor(&dev->primary);
 560 err_render_node:
 561         if (dev->render)
 562                 drm_put_minor(&dev->render);
 563 err_control_node:
 564         if (dev->control)
 565                 drm_put_minor(&dev->control);
 566 err_agp:
 567         if (dev->driver->bus->agp_destroy)
 568                 dev->driver->bus->agp_destroy(dev);
 569 out_unlock:
 570         mutex_unlock(&drm_global_mutex);
 571         return ret;
 572 }
 573 EXPORT_SYMBOL(drm_dev_register);
 574
 575 /**
 576  * drm_dev_unregister - Unregister DRM device
 577  * @dev: Device to unregister
 578  *
 579  * Unregister the DRM device from the system. This does the reverse of
 580  * drm_dev_register() but does not deallocate the device. The caller must call
 581  * drm_dev_free() to free all resources.
 582  */
 583 void drm_dev_unregister(struct drm_device *dev)
 584 {
 585         struct drm_map_list *r_list, *list_temp;
 586
 587         drm_lastclose(dev);
 588
 589         if (dev->driver->unload)
 590                 dev->driver->unload(dev);
 591
 592         if (dev->driver->bus->agp_destroy)
 593                 dev->driver->bus->agp_destroy(dev);
 594
 595         drm_vblank_cleanup(dev);
 596
 597         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
 598                 drm_rmmap(dev, r_list->map);
 599
 600         if (dev->control)
 601                 drm_put_minor(&dev->control);
 602         if (dev->render)
 603                 drm_put_minor(&dev->render);
 604         drm_put_minor(&dev->primary);
 605
 606         list_del(&dev->driver_item);
 607 }
 608 EXPORT_SYMBOL(drm_dev_unregister);