drm_drv.c revision c0e09200dc0813972442e550a5905a132768e56c
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_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 120}; 121 122#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 123 124/** 125 * Take down the DRM device. 126 * 127 * \param dev DRM device structure. 128 * 129 * Frees every resource in \p dev. 130 * 131 * \sa drm_device 132 */ 133int drm_lastclose(struct drm_device * dev) 134{ 135 struct drm_magic_entry *pt, *next; 136 struct drm_map_list *r_list, *list_t; 137 struct drm_vma_entry *vma, *vma_temp; 138 int i; 139 140 DRM_DEBUG("\n"); 141 142 if (dev->driver->lastclose) 143 dev->driver->lastclose(dev); 144 DRM_DEBUG("driver lastclose completed\n"); 145 146 if (dev->unique) { 147 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER); 148 dev->unique = NULL; 149 dev->unique_len = 0; 150 } 151 152 if (dev->irq_enabled) 153 drm_irq_uninstall(dev); 154 155 mutex_lock(&dev->struct_mutex); 156 157 /* Free drawable information memory */ 158 drm_drawable_free_all(dev); 159 del_timer(&dev->timer); 160 161 /* Clear pid list */ 162 if (dev->magicfree.next) { 163 list_for_each_entry_safe(pt, next, &dev->magicfree, head) { 164 list_del(&pt->head); 165 drm_ht_remove_item(&dev->magiclist, &pt->hash_item); 166 drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC); 167 } 168 drm_ht_remove(&dev->magiclist); 169 } 170 171 /* Clear AGP information */ 172 if (drm_core_has_AGP(dev) && dev->agp) { 173 struct drm_agp_mem *entry, *tempe; 174 175 /* Remove AGP resources, but leave dev->agp 176 intact until drv_cleanup is called. */ 177 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) { 178 if (entry->bound) 179 drm_unbind_agp(entry->memory); 180 drm_free_agp(entry->memory, entry->pages); 181 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS); 182 } 183 INIT_LIST_HEAD(&dev->agp->memory); 184 185 if (dev->agp->acquired) 186 drm_agp_release(dev); 187 188 dev->agp->acquired = 0; 189 dev->agp->enabled = 0; 190 } 191 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) { 192 drm_sg_cleanup(dev->sg); 193 dev->sg = NULL; 194 } 195 196 /* Clear vma list (only built for debugging) */ 197 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { 198 list_del(&vma->head); 199 drm_free(vma, sizeof(*vma), DRM_MEM_VMAS); 200 } 201 202 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) { 203 if (!(r_list->map->flags & _DRM_DRIVER)) { 204 drm_rmmap_locked(dev, r_list->map); 205 r_list = NULL; 206 } 207 } 208 209 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) { 210 for (i = 0; i < dev->queue_count; i++) { 211 if (dev->queuelist[i]) { 212 drm_free(dev->queuelist[i], 213 sizeof(*dev->queuelist[0]), 214 DRM_MEM_QUEUES); 215 dev->queuelist[i] = NULL; 216 } 217 } 218 drm_free(dev->queuelist, 219 dev->queue_slots * sizeof(*dev->queuelist), 220 DRM_MEM_QUEUES); 221 dev->queuelist = NULL; 222 } 223 dev->queue_count = 0; 224 225 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 226 drm_dma_takedown(dev); 227 228 if (dev->lock.hw_lock) { 229 dev->sigdata.lock = dev->lock.hw_lock = NULL; /* SHM removed */ 230 dev->lock.file_priv = NULL; 231 wake_up_interruptible(&dev->lock.lock_queue); 232 } 233 mutex_unlock(&dev->struct_mutex); 234 235 DRM_DEBUG("lastclose completed\n"); 236 return 0; 237} 238 239/** 240 * Module initialization. Called via init_module at module load time, or via 241 * linux/init/main.c (this is not currently supported). 242 * 243 * \return zero on success or a negative number on failure. 244 * 245 * Initializes an array of drm_device structures, and attempts to 246 * initialize all available devices, using consecutive minors, registering the 247 * stubs and initializing the AGP device. 248 * 249 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and 250 * after the initialization for driver customization. 251 */ 252int drm_init(struct drm_driver *driver) 253{ 254 struct pci_dev *pdev = NULL; 255 struct pci_device_id *pid; 256 int i; 257 258 DRM_DEBUG("\n"); 259 260 for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) { 261 pid = (struct pci_device_id *)&driver->pci_driver.id_table[i]; 262 263 pdev = NULL; 264 /* pass back in pdev to account for multiple identical cards */ 265 while ((pdev = 266 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 267 pid->subdevice, pdev)) != NULL) { 268 /* stealth mode requires a manual probe */ 269 pci_dev_get(pdev); 270 drm_get_dev(pdev, pid, driver); 271 } 272 } 273 return 0; 274} 275 276EXPORT_SYMBOL(drm_init); 277 278/** 279 * Called via cleanup_module() at module unload time. 280 * 281 * Cleans up all DRM device, calling drm_lastclose(). 282 * 283 * \sa drm_init 284 */ 285static void drm_cleanup(struct drm_device * dev) 286{ 287 DRM_DEBUG("\n"); 288 289 if (!dev) { 290 DRM_ERROR("cleanup called no dev\n"); 291 return; 292 } 293 294 drm_lastclose(dev); 295 296 if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) && 297 dev->agp && dev->agp->agp_mtrr >= 0) { 298 int retval; 299 retval = mtrr_del(dev->agp->agp_mtrr, 300 dev->agp->agp_info.aper_base, 301 dev->agp->agp_info.aper_size * 1024 * 1024); 302 DRM_DEBUG("mtrr_del=%d\n", retval); 303 } 304 305 if (drm_core_has_AGP(dev) && dev->agp) { 306 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS); 307 dev->agp = NULL; 308 } 309 310 if (dev->driver->unload) 311 dev->driver->unload(dev); 312 313 drm_ht_remove(&dev->map_hash); 314 drm_ctxbitmap_cleanup(dev); 315 316 drm_put_minor(&dev->primary); 317 if (drm_put_dev(dev)) 318 DRM_ERROR("Cannot unload module\n"); 319} 320 321int drm_minors_cleanup(int id, void *ptr, void *data) 322{ 323 struct drm_minor *minor = ptr; 324 struct drm_device *dev; 325 struct drm_driver *driver = data; 326 327 dev = minor->dev; 328 if (minor->dev->driver != driver) 329 return 0; 330 331 if (minor->type != DRM_MINOR_LEGACY) 332 return 0; 333 334 if (dev) 335 pci_dev_put(dev->pdev); 336 drm_cleanup(dev); 337 return 1; 338} 339 340void drm_exit(struct drm_driver *driver) 341{ 342 DRM_DEBUG("\n"); 343 344 idr_for_each(&drm_minors_idr, &drm_minors_cleanup, driver); 345 346 DRM_INFO("Module unloaded\n"); 347} 348 349EXPORT_SYMBOL(drm_exit); 350 351/** File operations structure */ 352static const struct file_operations drm_stub_fops = { 353 .owner = THIS_MODULE, 354 .open = drm_stub_open 355}; 356 357static int __init drm_core_init(void) 358{ 359 int ret = -ENOMEM; 360 361 idr_init(&drm_minors_idr); 362 363 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 364 goto err_p1; 365 366 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 367 if (IS_ERR(drm_class)) { 368 printk(KERN_ERR "DRM: Error creating drm class.\n"); 369 ret = PTR_ERR(drm_class); 370 goto err_p2; 371 } 372 373 drm_proc_root = proc_mkdir("dri", NULL); 374 if (!drm_proc_root) { 375 DRM_ERROR("Cannot create /proc/dri\n"); 376 ret = -1; 377 goto err_p3; 378 } 379 380 drm_mem_init(); 381 382 DRM_INFO("Initialized %s %d.%d.%d %s\n", 383 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 384 return 0; 385err_p3: 386 drm_sysfs_destroy(); 387err_p2: 388 unregister_chrdev(DRM_MAJOR, "drm"); 389 390 idr_destroy(&drm_minors_idr); 391err_p1: 392 return ret; 393} 394 395static void __exit drm_core_exit(void) 396{ 397 remove_proc_entry("dri", NULL); 398 drm_sysfs_destroy(); 399 400 unregister_chrdev(DRM_MAJOR, "drm"); 401 402 idr_destroy(&drm_minors_idr); 403} 404 405module_init(drm_core_init); 406module_exit(drm_core_exit); 407 408/** 409 * Get version information 410 * 411 * \param inode device inode. 412 * \param filp file pointer. 413 * \param cmd command. 414 * \param arg user argument, pointing to a drm_version structure. 415 * \return zero on success or negative number on failure. 416 * 417 * Fills in the version information in \p arg. 418 */ 419static int drm_version(struct drm_device *dev, void *data, 420 struct drm_file *file_priv) 421{ 422 struct drm_version *version = data; 423 int len; 424 425 version->version_major = dev->driver->major; 426 version->version_minor = dev->driver->minor; 427 version->version_patchlevel = dev->driver->patchlevel; 428 DRM_COPY(version->name, dev->driver->name); 429 DRM_COPY(version->date, dev->driver->date); 430 DRM_COPY(version->desc, dev->driver->desc); 431 432 return 0; 433} 434 435/** 436 * Called whenever a process performs an ioctl on /dev/drm. 437 * 438 * \param inode device inode. 439 * \param file_priv DRM file private. 440 * \param cmd command. 441 * \param arg user argument. 442 * \return zero on success or negative number on failure. 443 * 444 * Looks up the ioctl function in the ::ioctls table, checking for root 445 * previleges if so required, and dispatches to the respective function. 446 */ 447int drm_ioctl(struct inode *inode, struct file *filp, 448 unsigned int cmd, unsigned long arg) 449{ 450 struct drm_file *file_priv = filp->private_data; 451 struct drm_device *dev = file_priv->minor->dev; 452 struct drm_ioctl_desc *ioctl; 453 drm_ioctl_t *func; 454 unsigned int nr = DRM_IOCTL_NR(cmd); 455 int retcode = -EINVAL; 456 char *kdata = NULL; 457 458 atomic_inc(&dev->ioctl_count); 459 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]); 460 ++file_priv->ioctl_count; 461 462 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n", 463 task_pid_nr(current), cmd, nr, 464 (long)old_encode_dev(file_priv->minor->device), 465 file_priv->authenticated); 466 467 if ((nr >= DRM_CORE_IOCTL_COUNT) && 468 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 469 goto err_i1; 470 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 471 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) 472 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 473 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 474 ioctl = &drm_ioctls[nr]; 475 cmd = ioctl->cmd; 476 } else 477 goto err_i1; 478 479 /* Do not trust userspace, use our own definition */ 480 func = ioctl->func; 481 /* is there a local override? */ 482 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl) 483 func = dev->driver->dma_ioctl; 484 485 if (!func) { 486 DRM_DEBUG("no function\n"); 487 retcode = -EINVAL; 488 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) || 489 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) || 490 ((ioctl->flags & DRM_MASTER) && !file_priv->master)) { 491 retcode = -EACCES; 492 } else { 493 if (cmd & (IOC_IN | IOC_OUT)) { 494 kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 495 if (!kdata) { 496 retcode = -ENOMEM; 497 goto err_i1; 498 } 499 } 500 501 if (cmd & IOC_IN) { 502 if (copy_from_user(kdata, (void __user *)arg, 503 _IOC_SIZE(cmd)) != 0) { 504 retcode = -EFAULT; 505 goto err_i1; 506 } 507 } 508 retcode = func(dev, kdata, file_priv); 509 510 if ((retcode == 0) && (cmd & IOC_OUT)) { 511 if (copy_to_user((void __user *)arg, kdata, 512 _IOC_SIZE(cmd)) != 0) 513 retcode = -EFAULT; 514 } 515 } 516 517 err_i1: 518 if (kdata) 519 kfree(kdata); 520 atomic_dec(&dev->ioctl_count); 521 if (retcode) 522 DRM_DEBUG("ret = %x\n", retcode); 523 return retcode; 524} 525 526EXPORT_SYMBOL(drm_ioctl); 527 528drm_local_map_t *drm_getsarea(struct drm_device *dev) 529{ 530 struct drm_map_list *entry; 531 532 list_for_each_entry(entry, &dev->maplist, head) { 533 if (entry->map && entry->map->type == _DRM_SHM && 534 (entry->map->flags & _DRM_CONTAINS_LOCK)) { 535 return entry->map; 536 } 537 } 538 return NULL; 539} 540EXPORT_SYMBOL(drm_getsarea); 541