drm_drv.c revision 4ed0ce3d0bccd74416ba6beb33a8a79d1617e97b
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 39unsigned int drm_debug = 0; /* 1 to enable debug output */ 40EXPORT_SYMBOL(drm_debug); 41 42int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */ 43 44unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */ 45 46/* 47 * Default to use monotonic timestamps for wait-for-vblank and page-flip 48 * complete events. 49 */ 50unsigned int drm_timestamp_monotonic = 1; 51 52MODULE_AUTHOR(CORE_AUTHOR); 53MODULE_DESCRIPTION(CORE_DESC); 54MODULE_LICENSE("GPL and additional rights"); 55MODULE_PARM_DESC(debug, "Enable debug output"); 56MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs] (0: never disable, <0: disable immediately)"); 57MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]"); 58MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps"); 59 60module_param_named(debug, drm_debug, int, 0600); 61module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600); 62module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600); 63module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600); 64 65static DEFINE_SPINLOCK(drm_minor_lock); 66static struct idr drm_minors_idr; 67 68struct class *drm_class; 69static struct dentry *drm_debugfs_root; 70 71int drm_err(const char *func, const char *format, ...) 72{ 73 struct va_format vaf; 74 va_list args; 75 int r; 76 77 va_start(args, format); 78 79 vaf.fmt = format; 80 vaf.va = &args; 81 82 r = printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* %pV", func, &vaf); 83 84 va_end(args); 85 86 return r; 87} 88EXPORT_SYMBOL(drm_err); 89 90void drm_ut_debug_printk(const char *function_name, const char *format, ...) 91{ 92 struct va_format vaf; 93 va_list args; 94 95 va_start(args, format); 96 vaf.fmt = format; 97 vaf.va = &args; 98 99 printk(KERN_DEBUG "[" DRM_NAME ":%s] %pV", function_name, &vaf); 100 101 va_end(args); 102} 103EXPORT_SYMBOL(drm_ut_debug_printk); 104 105struct drm_master *drm_master_create(struct drm_minor *minor) 106{ 107 struct drm_master *master; 108 109 master = kzalloc(sizeof(*master), GFP_KERNEL); 110 if (!master) 111 return NULL; 112 113 kref_init(&master->refcount); 114 spin_lock_init(&master->lock.spinlock); 115 init_waitqueue_head(&master->lock.lock_queue); 116 if (drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER)) { 117 kfree(master); 118 return NULL; 119 } 120 INIT_LIST_HEAD(&master->magicfree); 121 master->minor = minor; 122 123 return master; 124} 125 126struct drm_master *drm_master_get(struct drm_master *master) 127{ 128 kref_get(&master->refcount); 129 return master; 130} 131EXPORT_SYMBOL(drm_master_get); 132 133static void drm_master_destroy(struct kref *kref) 134{ 135 struct drm_master *master = container_of(kref, struct drm_master, refcount); 136 struct drm_magic_entry *pt, *next; 137 struct drm_device *dev = master->minor->dev; 138 struct drm_map_list *r_list, *list_temp; 139 140 mutex_lock(&dev->struct_mutex); 141 if (dev->driver->master_destroy) 142 dev->driver->master_destroy(dev, master); 143 144 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) { 145 if (r_list->master == master) { 146 drm_rmmap_locked(dev, r_list->map); 147 r_list = NULL; 148 } 149 } 150 151 if (master->unique) { 152 kfree(master->unique); 153 master->unique = NULL; 154 master->unique_len = 0; 155 } 156 157 list_for_each_entry_safe(pt, next, &master->magicfree, head) { 158 list_del(&pt->head); 159 drm_ht_remove_item(&master->magiclist, &pt->hash_item); 160 kfree(pt); 161 } 162 163 drm_ht_remove(&master->magiclist); 164 165 mutex_unlock(&dev->struct_mutex); 166 kfree(master); 167} 168 169void drm_master_put(struct drm_master **master) 170{ 171 kref_put(&(*master)->refcount, drm_master_destroy); 172 *master = NULL; 173} 174EXPORT_SYMBOL(drm_master_put); 175 176int drm_setmaster_ioctl(struct drm_device *dev, void *data, 177 struct drm_file *file_priv) 178{ 179 int ret = 0; 180 181 mutex_lock(&dev->master_mutex); 182 if (drm_is_master(file_priv)) 183 goto out_unlock; 184 185 if (file_priv->minor->master) { 186 ret = -EINVAL; 187 goto out_unlock; 188 } 189 190 if (!file_priv->master) { 191 ret = -EINVAL; 192 goto out_unlock; 193 } 194 195 file_priv->minor->master = drm_master_get(file_priv->master); 196 if (dev->driver->master_set) { 197 ret = dev->driver->master_set(dev, file_priv, false); 198 if (unlikely(ret != 0)) 199 drm_master_put(&file_priv->minor->master); 200 } 201 202out_unlock: 203 mutex_unlock(&dev->master_mutex); 204 return ret; 205} 206 207int drm_dropmaster_ioctl(struct drm_device *dev, void *data, 208 struct drm_file *file_priv) 209{ 210 int ret = -EINVAL; 211 212 mutex_lock(&dev->master_mutex); 213 if (!drm_is_master(file_priv)) 214 goto out_unlock; 215 216 if (!file_priv->minor->master) 217 goto out_unlock; 218 219 ret = 0; 220 if (dev->driver->master_drop) 221 dev->driver->master_drop(dev, file_priv, false); 222 drm_master_put(&file_priv->minor->master); 223 224out_unlock: 225 mutex_unlock(&dev->master_mutex); 226 return ret; 227} 228 229/* 230 * DRM Minors 231 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each 232 * of them is represented by a drm_minor object. Depending on the capabilities 233 * of the device-driver, different interfaces are registered. 234 * 235 * Minors can be accessed via dev->$minor_name. This pointer is either 236 * NULL or a valid drm_minor pointer and stays valid as long as the device is 237 * valid. This means, DRM minors have the same life-time as the underlying 238 * device. However, this doesn't mean that the minor is active. Minors are 239 * registered and unregistered dynamically according to device-state. 240 */ 241 242static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, 243 unsigned int type) 244{ 245 switch (type) { 246 case DRM_MINOR_LEGACY: 247 return &dev->primary; 248 case DRM_MINOR_RENDER: 249 return &dev->render; 250 case DRM_MINOR_CONTROL: 251 return &dev->control; 252 default: 253 return NULL; 254 } 255} 256 257static int drm_minor_alloc(struct drm_device *dev, unsigned int type) 258{ 259 struct drm_minor *minor; 260 unsigned long flags; 261 int r; 262 263 minor = kzalloc(sizeof(*minor), GFP_KERNEL); 264 if (!minor) 265 return -ENOMEM; 266 267 minor->type = type; 268 minor->dev = dev; 269 270 idr_preload(GFP_KERNEL); 271 spin_lock_irqsave(&drm_minor_lock, flags); 272 r = idr_alloc(&drm_minors_idr, 273 NULL, 274 64 * type, 275 64 * (type + 1), 276 GFP_NOWAIT); 277 spin_unlock_irqrestore(&drm_minor_lock, flags); 278 idr_preload_end(); 279 280 if (r < 0) 281 goto err_free; 282 283 minor->index = r; 284 285 minor->kdev = drm_sysfs_minor_alloc(minor); 286 if (IS_ERR(minor->kdev)) { 287 r = PTR_ERR(minor->kdev); 288 goto err_index; 289 } 290 291 *drm_minor_get_slot(dev, type) = minor; 292 return 0; 293 294err_index: 295 spin_lock_irqsave(&drm_minor_lock, flags); 296 idr_remove(&drm_minors_idr, minor->index); 297 spin_unlock_irqrestore(&drm_minor_lock, flags); 298err_free: 299 kfree(minor); 300 return r; 301} 302 303static void drm_minor_free(struct drm_device *dev, unsigned int type) 304{ 305 struct drm_minor **slot, *minor; 306 unsigned long flags; 307 308 slot = drm_minor_get_slot(dev, type); 309 minor = *slot; 310 if (!minor) 311 return; 312 313 drm_mode_group_destroy(&minor->mode_group); 314 put_device(minor->kdev); 315 316 spin_lock_irqsave(&drm_minor_lock, flags); 317 idr_remove(&drm_minors_idr, minor->index); 318 spin_unlock_irqrestore(&drm_minor_lock, flags); 319 320 kfree(minor); 321 *slot = NULL; 322} 323 324static int drm_minor_register(struct drm_device *dev, unsigned int type) 325{ 326 struct drm_minor *minor; 327 unsigned long flags; 328 int ret; 329 330 DRM_DEBUG("\n"); 331 332 minor = *drm_minor_get_slot(dev, type); 333 if (!minor) 334 return 0; 335 336 ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); 337 if (ret) { 338 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); 339 return ret; 340 } 341 342 ret = device_add(minor->kdev); 343 if (ret) 344 goto err_debugfs; 345 346 /* replace NULL with @minor so lookups will succeed from now on */ 347 spin_lock_irqsave(&drm_minor_lock, flags); 348 idr_replace(&drm_minors_idr, minor, minor->index); 349 spin_unlock_irqrestore(&drm_minor_lock, flags); 350 351 DRM_DEBUG("new minor registered %d\n", minor->index); 352 return 0; 353 354err_debugfs: 355 drm_debugfs_cleanup(minor); 356 return ret; 357} 358 359static void drm_minor_unregister(struct drm_device *dev, unsigned int type) 360{ 361 struct drm_minor *minor; 362 unsigned long flags; 363 364 minor = *drm_minor_get_slot(dev, type); 365 if (!minor || !device_is_registered(minor->kdev)) 366 return; 367 368 /* replace @minor with NULL so lookups will fail from now on */ 369 spin_lock_irqsave(&drm_minor_lock, flags); 370 idr_replace(&drm_minors_idr, NULL, minor->index); 371 spin_unlock_irqrestore(&drm_minor_lock, flags); 372 373 device_del(minor->kdev); 374 dev_set_drvdata(minor->kdev, NULL); /* safety belt */ 375 drm_debugfs_cleanup(minor); 376} 377 378/** 379 * drm_minor_acquire - Acquire a DRM minor 380 * @minor_id: Minor ID of the DRM-minor 381 * 382 * Looks up the given minor-ID and returns the respective DRM-minor object. The 383 * refence-count of the underlying device is increased so you must release this 384 * object with drm_minor_release(). 385 * 386 * As long as you hold this minor, it is guaranteed that the object and the 387 * minor->dev pointer will stay valid! However, the device may get unplugged and 388 * unregistered while you hold the minor. 389 * 390 * Returns: 391 * Pointer to minor-object with increased device-refcount, or PTR_ERR on 392 * failure. 393 */ 394struct drm_minor *drm_minor_acquire(unsigned int minor_id) 395{ 396 struct drm_minor *minor; 397 unsigned long flags; 398 399 spin_lock_irqsave(&drm_minor_lock, flags); 400 minor = idr_find(&drm_minors_idr, minor_id); 401 if (minor) 402 drm_dev_ref(minor->dev); 403 spin_unlock_irqrestore(&drm_minor_lock, flags); 404 405 if (!minor) { 406 return ERR_PTR(-ENODEV); 407 } else if (drm_device_is_unplugged(minor->dev)) { 408 drm_dev_unref(minor->dev); 409 return ERR_PTR(-ENODEV); 410 } 411 412 return minor; 413} 414 415/** 416 * drm_minor_release - Release DRM minor 417 * @minor: Pointer to DRM minor object 418 * 419 * Release a minor that was previously acquired via drm_minor_acquire(). 420 */ 421void drm_minor_release(struct drm_minor *minor) 422{ 423 drm_dev_unref(minor->dev); 424} 425 426/** 427 * drm_put_dev - Unregister and release a DRM device 428 * @dev: DRM device 429 * 430 * Called at module unload time or when a PCI device is unplugged. 431 * 432 * Use of this function is discouraged. It will eventually go away completely. 433 * Please use drm_dev_unregister() and drm_dev_unref() explicitly instead. 434 * 435 * Cleans up all DRM device, calling drm_lastclose(). 436 */ 437void drm_put_dev(struct drm_device *dev) 438{ 439 DRM_DEBUG("\n"); 440 441 if (!dev) { 442 DRM_ERROR("cleanup called no dev\n"); 443 return; 444 } 445 446 drm_dev_unregister(dev); 447 drm_dev_unref(dev); 448} 449EXPORT_SYMBOL(drm_put_dev); 450 451void drm_unplug_dev(struct drm_device *dev) 452{ 453 /* for a USB device */ 454 drm_minor_unregister(dev, DRM_MINOR_LEGACY); 455 drm_minor_unregister(dev, DRM_MINOR_RENDER); 456 drm_minor_unregister(dev, DRM_MINOR_CONTROL); 457 458 mutex_lock(&drm_global_mutex); 459 460 drm_device_set_unplugged(dev); 461 462 if (dev->open_count == 0) { 463 drm_put_dev(dev); 464 } 465 mutex_unlock(&drm_global_mutex); 466} 467EXPORT_SYMBOL(drm_unplug_dev); 468 469/* 470 * DRM internal mount 471 * We want to be able to allocate our own "struct address_space" to control 472 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow 473 * stand-alone address_space objects, so we need an underlying inode. As there 474 * is no way to allocate an independent inode easily, we need a fake internal 475 * VFS mount-point. 476 * 477 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() 478 * frees it again. You are allowed to use iget() and iput() to get references to 479 * the inode. But each drm_fs_inode_new() call must be paired with exactly one 480 * drm_fs_inode_free() call (which does not have to be the last iput()). 481 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it 482 * between multiple inode-users. You could, technically, call 483 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an 484 * iput(), but this way you'd end up with a new vfsmount for each inode. 485 */ 486 487static int drm_fs_cnt; 488static struct vfsmount *drm_fs_mnt; 489 490static const struct dentry_operations drm_fs_dops = { 491 .d_dname = simple_dname, 492}; 493 494static const struct super_operations drm_fs_sops = { 495 .statfs = simple_statfs, 496}; 497 498static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, 499 const char *dev_name, void *data) 500{ 501 return mount_pseudo(fs_type, 502 "drm:", 503 &drm_fs_sops, 504 &drm_fs_dops, 505 0x010203ff); 506} 507 508static struct file_system_type drm_fs_type = { 509 .name = "drm", 510 .owner = THIS_MODULE, 511 .mount = drm_fs_mount, 512 .kill_sb = kill_anon_super, 513}; 514 515static struct inode *drm_fs_inode_new(void) 516{ 517 struct inode *inode; 518 int r; 519 520 r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); 521 if (r < 0) { 522 DRM_ERROR("Cannot mount pseudo fs: %d\n", r); 523 return ERR_PTR(r); 524 } 525 526 inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); 527 if (IS_ERR(inode)) 528 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); 529 530 return inode; 531} 532 533static void drm_fs_inode_free(struct inode *inode) 534{ 535 if (inode) { 536 iput(inode); 537 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); 538 } 539} 540 541/** 542 * drm_dev_alloc - Allocate new DRM device 543 * @driver: DRM driver to allocate device for 544 * @parent: Parent device object 545 * 546 * Allocate and initialize a new DRM device. No device registration is done. 547 * Call drm_dev_register() to advertice the device to user space and register it 548 * with other core subsystems. 549 * 550 * The initial ref-count of the object is 1. Use drm_dev_ref() and 551 * drm_dev_unref() to take and drop further ref-counts. 552 * 553 * RETURNS: 554 * Pointer to new DRM device, or NULL if out of memory. 555 */ 556struct drm_device *drm_dev_alloc(struct drm_driver *driver, 557 struct device *parent) 558{ 559 struct drm_device *dev; 560 int ret; 561 562 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 563 if (!dev) 564 return NULL; 565 566 kref_init(&dev->ref); 567 dev->dev = parent; 568 dev->driver = driver; 569 570 INIT_LIST_HEAD(&dev->filelist); 571 INIT_LIST_HEAD(&dev->ctxlist); 572 INIT_LIST_HEAD(&dev->vmalist); 573 INIT_LIST_HEAD(&dev->maplist); 574 INIT_LIST_HEAD(&dev->vblank_event_list); 575 576 spin_lock_init(&dev->buf_lock); 577 spin_lock_init(&dev->event_lock); 578 mutex_init(&dev->struct_mutex); 579 mutex_init(&dev->ctxlist_mutex); 580 mutex_init(&dev->master_mutex); 581 582 dev->anon_inode = drm_fs_inode_new(); 583 if (IS_ERR(dev->anon_inode)) { 584 ret = PTR_ERR(dev->anon_inode); 585 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); 586 goto err_free; 587 } 588 589 if (drm_core_check_feature(dev, DRIVER_MODESET)) { 590 ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL); 591 if (ret) 592 goto err_minors; 593 } 594 595 if (drm_core_check_feature(dev, DRIVER_RENDER)) { 596 ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); 597 if (ret) 598 goto err_minors; 599 } 600 601 ret = drm_minor_alloc(dev, DRM_MINOR_LEGACY); 602 if (ret) 603 goto err_minors; 604 605 if (drm_ht_create(&dev->map_hash, 12)) 606 goto err_minors; 607 608 ret = drm_legacy_ctxbitmap_init(dev); 609 if (ret) { 610 DRM_ERROR("Cannot allocate memory for context bitmap.\n"); 611 goto err_ht; 612 } 613 614 if (driver->driver_features & DRIVER_GEM) { 615 ret = drm_gem_init(dev); 616 if (ret) { 617 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); 618 goto err_ctxbitmap; 619 } 620 } 621 622 return dev; 623 624err_ctxbitmap: 625 drm_legacy_ctxbitmap_cleanup(dev); 626err_ht: 627 drm_ht_remove(&dev->map_hash); 628err_minors: 629 drm_minor_free(dev, DRM_MINOR_LEGACY); 630 drm_minor_free(dev, DRM_MINOR_RENDER); 631 drm_minor_free(dev, DRM_MINOR_CONTROL); 632 drm_fs_inode_free(dev->anon_inode); 633err_free: 634 mutex_destroy(&dev->master_mutex); 635 kfree(dev); 636 return NULL; 637} 638EXPORT_SYMBOL(drm_dev_alloc); 639 640static void drm_dev_release(struct kref *ref) 641{ 642 struct drm_device *dev = container_of(ref, struct drm_device, ref); 643 644 if (dev->driver->driver_features & DRIVER_GEM) 645 drm_gem_destroy(dev); 646 647 drm_legacy_ctxbitmap_cleanup(dev); 648 drm_ht_remove(&dev->map_hash); 649 drm_fs_inode_free(dev->anon_inode); 650 651 drm_minor_free(dev, DRM_MINOR_LEGACY); 652 drm_minor_free(dev, DRM_MINOR_RENDER); 653 drm_minor_free(dev, DRM_MINOR_CONTROL); 654 655 mutex_destroy(&dev->master_mutex); 656 kfree(dev->unique); 657 kfree(dev); 658} 659 660/** 661 * drm_dev_ref - Take reference of a DRM device 662 * @dev: device to take reference of or NULL 663 * 664 * This increases the ref-count of @dev by one. You *must* already own a 665 * reference when calling this. Use drm_dev_unref() to drop this reference 666 * again. 667 * 668 * This function never fails. However, this function does not provide *any* 669 * guarantee whether the device is alive or running. It only provides a 670 * reference to the object and the memory associated with it. 671 */ 672void drm_dev_ref(struct drm_device *dev) 673{ 674 if (dev) 675 kref_get(&dev->ref); 676} 677EXPORT_SYMBOL(drm_dev_ref); 678 679/** 680 * drm_dev_unref - Drop reference of a DRM device 681 * @dev: device to drop reference of or NULL 682 * 683 * This decreases the ref-count of @dev by one. The device is destroyed if the 684 * ref-count drops to zero. 685 */ 686void drm_dev_unref(struct drm_device *dev) 687{ 688 if (dev) 689 kref_put(&dev->ref, drm_dev_release); 690} 691EXPORT_SYMBOL(drm_dev_unref); 692 693/** 694 * drm_dev_register - Register DRM device 695 * @dev: Device to register 696 * @flags: Flags passed to the driver's .load() function 697 * 698 * Register the DRM device @dev with the system, advertise device to user-space 699 * and start normal device operation. @dev must be allocated via drm_dev_alloc() 700 * previously. 701 * 702 * Never call this twice on any device! 703 * 704 * RETURNS: 705 * 0 on success, negative error code on failure. 706 */ 707int drm_dev_register(struct drm_device *dev, unsigned long flags) 708{ 709 int ret; 710 711 mutex_lock(&drm_global_mutex); 712 713 ret = drm_minor_register(dev, DRM_MINOR_CONTROL); 714 if (ret) 715 goto err_minors; 716 717 ret = drm_minor_register(dev, DRM_MINOR_RENDER); 718 if (ret) 719 goto err_minors; 720 721 ret = drm_minor_register(dev, DRM_MINOR_LEGACY); 722 if (ret) 723 goto err_minors; 724 725 if (dev->driver->load) { 726 ret = dev->driver->load(dev, flags); 727 if (ret) 728 goto err_minors; 729 } 730 731 /* setup grouping for legacy outputs */ 732 if (drm_core_check_feature(dev, DRIVER_MODESET)) { 733 ret = drm_mode_group_init_legacy_group(dev, 734 &dev->primary->mode_group); 735 if (ret) 736 goto err_unload; 737 } 738 739 ret = 0; 740 goto out_unlock; 741 742err_unload: 743 if (dev->driver->unload) 744 dev->driver->unload(dev); 745err_minors: 746 drm_minor_unregister(dev, DRM_MINOR_LEGACY); 747 drm_minor_unregister(dev, DRM_MINOR_RENDER); 748 drm_minor_unregister(dev, DRM_MINOR_CONTROL); 749out_unlock: 750 mutex_unlock(&drm_global_mutex); 751 return ret; 752} 753EXPORT_SYMBOL(drm_dev_register); 754 755/** 756 * drm_dev_unregister - Unregister DRM device 757 * @dev: Device to unregister 758 * 759 * Unregister the DRM device from the system. This does the reverse of 760 * drm_dev_register() but does not deallocate the device. The caller must call 761 * drm_dev_unref() to drop their final reference. 762 */ 763void drm_dev_unregister(struct drm_device *dev) 764{ 765 struct drm_map_list *r_list, *list_temp; 766 767 drm_lastclose(dev); 768 769 if (dev->driver->unload) 770 dev->driver->unload(dev); 771 772 if (dev->agp) 773 drm_pci_agp_destroy(dev); 774 775 drm_vblank_cleanup(dev); 776 777 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) 778 drm_rmmap(dev, r_list->map); 779 780 drm_minor_unregister(dev, DRM_MINOR_LEGACY); 781 drm_minor_unregister(dev, DRM_MINOR_RENDER); 782 drm_minor_unregister(dev, DRM_MINOR_CONTROL); 783} 784EXPORT_SYMBOL(drm_dev_unregister); 785 786/** 787 * drm_dev_set_unique - Set the unique name of a DRM device 788 * @dev: device of which to set the unique name 789 * @fmt: format string for unique name 790 * 791 * Sets the unique name of a DRM device using the specified format string and 792 * a variable list of arguments. Drivers can use this at driver probe time if 793 * the unique name of the devices they drive is static. 794 * 795 * Return: 0 on success or a negative error code on failure. 796 */ 797int drm_dev_set_unique(struct drm_device *dev, const char *fmt, ...) 798{ 799 va_list ap; 800 801 kfree(dev->unique); 802 803 va_start(ap, fmt); 804 dev->unique = kvasprintf(GFP_KERNEL, fmt, ap); 805 va_end(ap); 806 807 return dev->unique ? 0 : -ENOMEM; 808} 809EXPORT_SYMBOL(drm_dev_set_unique); 810 811/* 812 * DRM Core 813 * The DRM core module initializes all global DRM objects and makes them 814 * available to drivers. Once setup, drivers can probe their respective 815 * devices. 816 * Currently, core management includes: 817 * - The "DRM-Global" key/value database 818 * - Global ID management for connectors 819 * - DRM major number allocation 820 * - DRM minor management 821 * - DRM sysfs class 822 * - DRM debugfs root 823 * 824 * Furthermore, the DRM core provides dynamic char-dev lookups. For each 825 * interface registered on a DRM device, you can request minor numbers from DRM 826 * core. DRM core takes care of major-number management and char-dev 827 * registration. A stub ->open() callback forwards any open() requests to the 828 * registered minor. 829 */ 830 831static int drm_stub_open(struct inode *inode, struct file *filp) 832{ 833 const struct file_operations *new_fops; 834 struct drm_minor *minor; 835 int err; 836 837 DRM_DEBUG("\n"); 838 839 mutex_lock(&drm_global_mutex); 840 minor = drm_minor_acquire(iminor(inode)); 841 if (IS_ERR(minor)) { 842 err = PTR_ERR(minor); 843 goto out_unlock; 844 } 845 846 new_fops = fops_get(minor->dev->driver->fops); 847 if (!new_fops) { 848 err = -ENODEV; 849 goto out_release; 850 } 851 852 replace_fops(filp, new_fops); 853 if (filp->f_op->open) 854 err = filp->f_op->open(inode, filp); 855 else 856 err = 0; 857 858out_release: 859 drm_minor_release(minor); 860out_unlock: 861 mutex_unlock(&drm_global_mutex); 862 return err; 863} 864 865static const struct file_operations drm_stub_fops = { 866 .owner = THIS_MODULE, 867 .open = drm_stub_open, 868 .llseek = noop_llseek, 869}; 870 871static int __init drm_core_init(void) 872{ 873 int ret = -ENOMEM; 874 875 drm_global_init(); 876 drm_connector_ida_init(); 877 idr_init(&drm_minors_idr); 878 879 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 880 goto err_p1; 881 882 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 883 if (IS_ERR(drm_class)) { 884 printk(KERN_ERR "DRM: Error creating drm class.\n"); 885 ret = PTR_ERR(drm_class); 886 goto err_p2; 887 } 888 889 drm_debugfs_root = debugfs_create_dir("dri", NULL); 890 if (!drm_debugfs_root) { 891 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); 892 ret = -1; 893 goto err_p3; 894 } 895 896 DRM_INFO("Initialized %s %d.%d.%d %s\n", 897 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 898 return 0; 899err_p3: 900 drm_sysfs_destroy(); 901err_p2: 902 unregister_chrdev(DRM_MAJOR, "drm"); 903 904 idr_destroy(&drm_minors_idr); 905err_p1: 906 return ret; 907} 908 909static void __exit drm_core_exit(void) 910{ 911 debugfs_remove(drm_debugfs_root); 912 drm_sysfs_destroy(); 913 914 unregister_chrdev(DRM_MAJOR, "drm"); 915 916 drm_connector_ida_destroy(); 917 idr_destroy(&drm_minors_idr); 918} 919 920module_init(drm_core_init); 921module_exit(drm_core_exit); 922