drm_drv.c revision 673a394b1e3b69be886ff24abfd6df97c52e8d08
1/** 2 * \file drm_drv.c 3 * Generic driver template 4 * 5 * \author Rickard E. (Rik) Faith <faith@valinux.com> 6 * \author Gareth Hughes <gareth@valinux.com> 7 * 8 * To use this template, you must at least define the following (samples 9 * given for the MGA driver): 10 * 11 * \code 12 * #define DRIVER_AUTHOR "VA Linux Systems, Inc." 13 * 14 * #define DRIVER_NAME "mga" 15 * #define DRIVER_DESC "Matrox G200/G400" 16 * #define DRIVER_DATE "20001127" 17 * 18 * #define drm_x mga_##x 19 * \endcode 20 */ 21 22/* 23 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com 24 * 25 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. 26 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 27 * All Rights Reserved. 28 * 29 * Permission is hereby granted, free of charge, to any person obtaining a 30 * copy of this software and associated documentation files (the "Software"), 31 * to deal in the Software without restriction, including without limitation 32 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 33 * and/or sell copies of the Software, and to permit persons to whom the 34 * Software is furnished to do so, subject to the following conditions: 35 * 36 * The above copyright notice and this permission notice (including the next 37 * paragraph) shall be included in all copies or substantial portions of the 38 * Software. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 41 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 42 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 43 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 44 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 45 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 46 * OTHER DEALINGS IN THE SOFTWARE. 47 */ 48 49#include "drmP.h" 50#include "drm_core.h" 51 52static int drm_version(struct drm_device *dev, void *data, 53 struct drm_file *file_priv); 54 55/** Ioctl table */ 56static struct drm_ioctl_desc drm_ioctls[] = { 57 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0), 58 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 59 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 60 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 61 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0), 62 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0), 63 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0), 64 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER|DRM_ROOT_ONLY), 65 66 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 67 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 68 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 69 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 70 71 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 72 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH), 73 74 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 75 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH), 76 77 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY), 78 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 79 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 80 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH), 81 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 82 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 83 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH), 84 85 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 86 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 87 88 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH), 89 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH), 90 91 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 92 93 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 94 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 95 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH), 96 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH), 97 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH), 98 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */ 99 DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH), 100 101 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 102 103#if __OS_HAS_AGP 104 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 105 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 106 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 107 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 108 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 109 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 110 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 111 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 112#endif 113 114 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 115 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 116 117 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0), 118 119 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 120 121 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 122 123 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, 0), 124 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH), 125 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH), 126}; 127 128#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 129 130/** 131 * Take down the DRM device. 132 * 133 * \param dev DRM device structure. 134 * 135 * Frees every resource in \p dev. 136 * 137 * \sa drm_device 138 */ 139int drm_lastclose(struct drm_device * dev) 140{ 141 struct drm_magic_entry *pt, *next; 142 struct drm_map_list *r_list, *list_t; 143 struct drm_vma_entry *vma, *vma_temp; 144 int i; 145 146 DRM_DEBUG("\n"); 147 148 if (dev->driver->lastclose) 149 dev->driver->lastclose(dev); 150 DRM_DEBUG("driver lastclose completed\n"); 151 152 if (dev->unique) { 153 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER); 154 dev->unique = NULL; 155 dev->unique_len = 0; 156 } 157 158 if (dev->irq_enabled) 159 drm_irq_uninstall(dev); 160 161 mutex_lock(&dev->struct_mutex); 162 163 /* Free drawable information memory */ 164 drm_drawable_free_all(dev); 165 del_timer(&dev->timer); 166 167 /* Clear pid list */ 168 if (dev->magicfree.next) { 169 list_for_each_entry_safe(pt, next, &dev->magicfree, head) { 170 list_del(&pt->head); 171 drm_ht_remove_item(&dev->magiclist, &pt->hash_item); 172 drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC); 173 } 174 drm_ht_remove(&dev->magiclist); 175 } 176 177 /* Clear AGP information */ 178 if (drm_core_has_AGP(dev) && dev->agp) { 179 struct drm_agp_mem *entry, *tempe; 180 181 /* Remove AGP resources, but leave dev->agp 182 intact until drv_cleanup is called. */ 183 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) { 184 if (entry->bound) 185 drm_unbind_agp(entry->memory); 186 drm_free_agp(entry->memory, entry->pages); 187 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS); 188 } 189 INIT_LIST_HEAD(&dev->agp->memory); 190 191 if (dev->agp->acquired) 192 drm_agp_release(dev); 193 194 dev->agp->acquired = 0; 195 dev->agp->enabled = 0; 196 } 197 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) { 198 drm_sg_cleanup(dev->sg); 199 dev->sg = NULL; 200 } 201 202 /* Clear vma list (only built for debugging) */ 203 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { 204 list_del(&vma->head); 205 drm_free(vma, sizeof(*vma), DRM_MEM_VMAS); 206 } 207 208 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) { 209 if (!(r_list->map->flags & _DRM_DRIVER)) { 210 drm_rmmap_locked(dev, r_list->map); 211 r_list = NULL; 212 } 213 } 214 215 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) { 216 for (i = 0; i < dev->queue_count; i++) { 217 if (dev->queuelist[i]) { 218 drm_free(dev->queuelist[i], 219 sizeof(*dev->queuelist[0]), 220 DRM_MEM_QUEUES); 221 dev->queuelist[i] = NULL; 222 } 223 } 224 drm_free(dev->queuelist, 225 dev->queue_slots * sizeof(*dev->queuelist), 226 DRM_MEM_QUEUES); 227 dev->queuelist = NULL; 228 } 229 dev->queue_count = 0; 230 231 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 232 drm_dma_takedown(dev); 233 234 if (dev->lock.hw_lock) { 235 dev->sigdata.lock = dev->lock.hw_lock = NULL; /* SHM removed */ 236 dev->lock.file_priv = NULL; 237 wake_up_interruptible(&dev->lock.lock_queue); 238 } 239 mutex_unlock(&dev->struct_mutex); 240 241 DRM_DEBUG("lastclose completed\n"); 242 return 0; 243} 244 245/** 246 * Module initialization. Called via init_module at module load time, or via 247 * linux/init/main.c (this is not currently supported). 248 * 249 * \return zero on success or a negative number on failure. 250 * 251 * Initializes an array of drm_device structures, and attempts to 252 * initialize all available devices, using consecutive minors, registering the 253 * stubs and initializing the AGP device. 254 * 255 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and 256 * after the initialization for driver customization. 257 */ 258int drm_init(struct drm_driver *driver) 259{ 260 struct pci_dev *pdev = NULL; 261 struct pci_device_id *pid; 262 int i; 263 264 DRM_DEBUG("\n"); 265 266 for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) { 267 pid = (struct pci_device_id *)&driver->pci_driver.id_table[i]; 268 269 pdev = NULL; 270 /* pass back in pdev to account for multiple identical cards */ 271 while ((pdev = 272 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 273 pid->subdevice, pdev)) != NULL) { 274 /* stealth mode requires a manual probe */ 275 pci_dev_get(pdev); 276 drm_get_dev(pdev, pid, driver); 277 } 278 } 279 return 0; 280} 281 282EXPORT_SYMBOL(drm_init); 283 284/** 285 * Called via cleanup_module() at module unload time. 286 * 287 * Cleans up all DRM device, calling drm_lastclose(). 288 * 289 * \sa drm_init 290 */ 291static void drm_cleanup(struct drm_device * dev) 292{ 293 DRM_DEBUG("\n"); 294 295 if (!dev) { 296 DRM_ERROR("cleanup called no dev\n"); 297 return; 298 } 299 300 drm_lastclose(dev); 301 302 if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) && 303 dev->agp && dev->agp->agp_mtrr >= 0) { 304 int retval; 305 retval = mtrr_del(dev->agp->agp_mtrr, 306 dev->agp->agp_info.aper_base, 307 dev->agp->agp_info.aper_size * 1024 * 1024); 308 DRM_DEBUG("mtrr_del=%d\n", retval); 309 } 310 311 if (drm_core_has_AGP(dev) && dev->agp) { 312 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS); 313 dev->agp = NULL; 314 } 315 316 if (dev->driver->unload) 317 dev->driver->unload(dev); 318 319 drm_ht_remove(&dev->map_hash); 320 drm_ctxbitmap_cleanup(dev); 321 322 drm_put_minor(&dev->primary); 323 if (drm_put_dev(dev)) 324 DRM_ERROR("Cannot unload module\n"); 325} 326 327static int drm_minors_cleanup(int id, void *ptr, void *data) 328{ 329 struct drm_minor *minor = ptr; 330 struct drm_device *dev; 331 struct drm_driver *driver = data; 332 333 dev = minor->dev; 334 if (minor->dev->driver != driver) 335 return 0; 336 337 if (minor->type != DRM_MINOR_LEGACY) 338 return 0; 339 340 if (dev) 341 pci_dev_put(dev->pdev); 342 drm_cleanup(dev); 343 return 1; 344} 345 346void drm_exit(struct drm_driver *driver) 347{ 348 DRM_DEBUG("\n"); 349 350 idr_for_each(&drm_minors_idr, &drm_minors_cleanup, driver); 351 352 DRM_INFO("Module unloaded\n"); 353} 354 355EXPORT_SYMBOL(drm_exit); 356 357/** File operations structure */ 358static const struct file_operations drm_stub_fops = { 359 .owner = THIS_MODULE, 360 .open = drm_stub_open 361}; 362 363static int __init drm_core_init(void) 364{ 365 int ret = -ENOMEM; 366 367 idr_init(&drm_minors_idr); 368 369 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 370 goto err_p1; 371 372 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 373 if (IS_ERR(drm_class)) { 374 printk(KERN_ERR "DRM: Error creating drm class.\n"); 375 ret = PTR_ERR(drm_class); 376 goto err_p2; 377 } 378 379 drm_proc_root = proc_mkdir("dri", NULL); 380 if (!drm_proc_root) { 381 DRM_ERROR("Cannot create /proc/dri\n"); 382 ret = -1; 383 goto err_p3; 384 } 385 386 drm_mem_init(); 387 388 DRM_INFO("Initialized %s %d.%d.%d %s\n", 389 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 390 return 0; 391err_p3: 392 drm_sysfs_destroy(); 393err_p2: 394 unregister_chrdev(DRM_MAJOR, "drm"); 395 396 idr_destroy(&drm_minors_idr); 397err_p1: 398 return ret; 399} 400 401static void __exit drm_core_exit(void) 402{ 403 remove_proc_entry("dri", NULL); 404 drm_sysfs_destroy(); 405 406 unregister_chrdev(DRM_MAJOR, "drm"); 407 408 idr_destroy(&drm_minors_idr); 409} 410 411module_init(drm_core_init); 412module_exit(drm_core_exit); 413 414/** 415 * Get version information 416 * 417 * \param inode device inode. 418 * \param filp file pointer. 419 * \param cmd command. 420 * \param arg user argument, pointing to a drm_version structure. 421 * \return zero on success or negative number on failure. 422 * 423 * Fills in the version information in \p arg. 424 */ 425static int drm_version(struct drm_device *dev, void *data, 426 struct drm_file *file_priv) 427{ 428 struct drm_version *version = data; 429 int len; 430 431 version->version_major = dev->driver->major; 432 version->version_minor = dev->driver->minor; 433 version->version_patchlevel = dev->driver->patchlevel; 434 DRM_COPY(version->name, dev->driver->name); 435 DRM_COPY(version->date, dev->driver->date); 436 DRM_COPY(version->desc, dev->driver->desc); 437 438 return 0; 439} 440 441/** 442 * Called whenever a process performs an ioctl on /dev/drm. 443 * 444 * \param inode device inode. 445 * \param file_priv DRM file private. 446 * \param cmd command. 447 * \param arg user argument. 448 * \return zero on success or negative number on failure. 449 * 450 * Looks up the ioctl function in the ::ioctls table, checking for root 451 * previleges if so required, and dispatches to the respective function. 452 */ 453int drm_ioctl(struct inode *inode, struct file *filp, 454 unsigned int cmd, unsigned long arg) 455{ 456 struct drm_file *file_priv = filp->private_data; 457 struct drm_device *dev = file_priv->minor->dev; 458 struct drm_ioctl_desc *ioctl; 459 drm_ioctl_t *func; 460 unsigned int nr = DRM_IOCTL_NR(cmd); 461 int retcode = -EINVAL; 462 char *kdata = NULL; 463 464 atomic_inc(&dev->ioctl_count); 465 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]); 466 ++file_priv->ioctl_count; 467 468 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n", 469 task_pid_nr(current), cmd, nr, 470 (long)old_encode_dev(file_priv->minor->device), 471 file_priv->authenticated); 472 473 if ((nr >= DRM_CORE_IOCTL_COUNT) && 474 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 475 goto err_i1; 476 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 477 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) 478 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 479 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 480 ioctl = &drm_ioctls[nr]; 481 cmd = ioctl->cmd; 482 } else 483 goto err_i1; 484 485 /* Do not trust userspace, use our own definition */ 486 func = ioctl->func; 487 /* is there a local override? */ 488 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl) 489 func = dev->driver->dma_ioctl; 490 491 if (!func) { 492 DRM_DEBUG("no function\n"); 493 retcode = -EINVAL; 494 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) || 495 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) || 496 ((ioctl->flags & DRM_MASTER) && !file_priv->master)) { 497 retcode = -EACCES; 498 } else { 499 if (cmd & (IOC_IN | IOC_OUT)) { 500 kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 501 if (!kdata) { 502 retcode = -ENOMEM; 503 goto err_i1; 504 } 505 } 506 507 if (cmd & IOC_IN) { 508 if (copy_from_user(kdata, (void __user *)arg, 509 _IOC_SIZE(cmd)) != 0) { 510 retcode = -EFAULT; 511 goto err_i1; 512 } 513 } 514 retcode = func(dev, kdata, file_priv); 515 516 if ((retcode == 0) && (cmd & IOC_OUT)) { 517 if (copy_to_user((void __user *)arg, kdata, 518 _IOC_SIZE(cmd)) != 0) 519 retcode = -EFAULT; 520 } 521 } 522 523 err_i1: 524 if (kdata) 525 kfree(kdata); 526 atomic_dec(&dev->ioctl_count); 527 if (retcode) 528 DRM_DEBUG("ret = %x\n", retcode); 529 return retcode; 530} 531 532EXPORT_SYMBOL(drm_ioctl); 533 534drm_local_map_t *drm_getsarea(struct drm_device *dev) 535{ 536 struct drm_map_list *entry; 537 538 list_for_each_entry(entry, &dev->maplist, head) { 539 if (entry->map && entry->map->type == _DRM_SHM && 540 (entry->map->flags & _DRM_CONTAINS_LOCK)) { 541 return entry->map; 542 } 543 } 544 return NULL; 545} 546EXPORT_SYMBOL(drm_getsarea); 547