drm_drv.c revision 58374713c9dfb4d231f8c56cac089f6fbdedc2ec
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 <linux/debugfs.h> 50#include <linux/slab.h> 51#include "drmP.h" 52#include "drm_core.h" 53 54 55static int drm_version(struct drm_device *dev, void *data, 56 struct drm_file *file_priv); 57 58/** Ioctl table */ 59static struct drm_ioctl_desc drm_ioctls[] = { 60 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0), 61 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 62 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 63 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 64 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0), 65 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0), 66 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0), 67 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 68 69 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 70 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 71 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 72 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 73 74 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 75 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH), 76 77 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 78 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH), 79 80 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 81 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 82 83 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY), 84 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 85 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 86 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH), 87 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 88 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 89 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH), 90 91 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 92 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 93 94 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH), 95 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH), 96 97 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 98 99 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 100 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 101 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH), 102 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH), 103 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH), 104 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */ 105 DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH), 106 107 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 108 109#if __OS_HAS_AGP 110 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 111 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 112 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 113 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 114 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 115 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 116 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 117 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 118#endif 119 120 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 121 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 122 123 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0), 124 125 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 126 127 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 128 129 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED), 130 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 131 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 132 133 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 134 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 135 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 136 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 137 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER|DRM_UNLOCKED), 138 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 139 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 140 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 141 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 142 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 143 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW|DRM_UNLOCKED), 144 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 145 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 146 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 147 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 148 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 149 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 150 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED) 151}; 152 153#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 154 155/** 156 * Take down the DRM device. 157 * 158 * \param dev DRM device structure. 159 * 160 * Frees every resource in \p dev. 161 * 162 * \sa drm_device 163 */ 164int drm_lastclose(struct drm_device * dev) 165{ 166 struct drm_vma_entry *vma, *vma_temp; 167 int i; 168 169 DRM_DEBUG("\n"); 170 171 if (dev->driver->lastclose) 172 dev->driver->lastclose(dev); 173 DRM_DEBUG("driver lastclose completed\n"); 174 175 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET)) 176 drm_irq_uninstall(dev); 177 178 mutex_lock(&dev->struct_mutex); 179 180 /* Free drawable information memory */ 181 drm_drawable_free_all(dev); 182 del_timer(&dev->timer); 183 184 /* Clear AGP information */ 185 if (drm_core_has_AGP(dev) && dev->agp && 186 !drm_core_check_feature(dev, DRIVER_MODESET)) { 187 struct drm_agp_mem *entry, *tempe; 188 189 /* Remove AGP resources, but leave dev->agp 190 intact until drv_cleanup is called. */ 191 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) { 192 if (entry->bound) 193 drm_unbind_agp(entry->memory); 194 drm_free_agp(entry->memory, entry->pages); 195 kfree(entry); 196 } 197 INIT_LIST_HEAD(&dev->agp->memory); 198 199 if (dev->agp->acquired) 200 drm_agp_release(dev); 201 202 dev->agp->acquired = 0; 203 dev->agp->enabled = 0; 204 } 205 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg && 206 !drm_core_check_feature(dev, DRIVER_MODESET)) { 207 drm_sg_cleanup(dev->sg); 208 dev->sg = NULL; 209 } 210 211 /* Clear vma list (only built for debugging) */ 212 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { 213 list_del(&vma->head); 214 kfree(vma); 215 } 216 217 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) { 218 for (i = 0; i < dev->queue_count; i++) { 219 kfree(dev->queuelist[i]); 220 dev->queuelist[i] = NULL; 221 } 222 kfree(dev->queuelist); 223 dev->queuelist = NULL; 224 } 225 dev->queue_count = 0; 226 227 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && 228 !drm_core_check_feature(dev, DRIVER_MODESET)) 229 drm_dma_takedown(dev); 230 231 dev->dev_mapping = NULL; 232 mutex_unlock(&dev->struct_mutex); 233 234 DRM_DEBUG("lastclose completed\n"); 235 return 0; 236} 237 238/** 239 * Module initialization. Called via init_module at module load time, or via 240 * linux/init/main.c (this is not currently supported). 241 * 242 * \return zero on success or a negative number on failure. 243 * 244 * Initializes an array of drm_device structures, and attempts to 245 * initialize all available devices, using consecutive minors, registering the 246 * stubs and initializing the device. 247 * 248 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and 249 * after the initialization for driver customization. 250 */ 251int drm_init(struct drm_driver *driver) 252{ 253 DRM_DEBUG("\n"); 254 INIT_LIST_HEAD(&driver->device_list); 255 256 if (driver->driver_features & DRIVER_USE_PLATFORM_DEVICE) 257 return drm_platform_init(driver); 258 else 259 return drm_pci_init(driver); 260} 261 262EXPORT_SYMBOL(drm_init); 263 264void drm_exit(struct drm_driver *driver) 265{ 266 struct drm_device *dev, *tmp; 267 DRM_DEBUG("\n"); 268 269 if (driver->driver_features & DRIVER_MODESET) { 270 pci_unregister_driver(&driver->pci_driver); 271 } else { 272 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item) 273 drm_put_dev(dev); 274 } 275 276 DRM_INFO("Module unloaded\n"); 277} 278 279EXPORT_SYMBOL(drm_exit); 280 281/** File operations structure */ 282static const struct file_operations drm_stub_fops = { 283 .owner = THIS_MODULE, 284 .open = drm_stub_open 285}; 286 287static int __init drm_core_init(void) 288{ 289 int ret = -ENOMEM; 290 291 drm_global_init(); 292 idr_init(&drm_minors_idr); 293 294 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 295 goto err_p1; 296 297 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 298 if (IS_ERR(drm_class)) { 299 printk(KERN_ERR "DRM: Error creating drm class.\n"); 300 ret = PTR_ERR(drm_class); 301 goto err_p2; 302 } 303 304 drm_proc_root = proc_mkdir("dri", NULL); 305 if (!drm_proc_root) { 306 DRM_ERROR("Cannot create /proc/dri\n"); 307 ret = -1; 308 goto err_p3; 309 } 310 311 drm_debugfs_root = debugfs_create_dir("dri", NULL); 312 if (!drm_debugfs_root) { 313 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); 314 ret = -1; 315 goto err_p3; 316 } 317 318 DRM_INFO("Initialized %s %d.%d.%d %s\n", 319 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 320 return 0; 321err_p3: 322 drm_sysfs_destroy(); 323err_p2: 324 unregister_chrdev(DRM_MAJOR, "drm"); 325 326 idr_destroy(&drm_minors_idr); 327err_p1: 328 return ret; 329} 330 331static void __exit drm_core_exit(void) 332{ 333 remove_proc_entry("dri", NULL); 334 debugfs_remove(drm_debugfs_root); 335 drm_sysfs_destroy(); 336 337 unregister_chrdev(DRM_MAJOR, "drm"); 338 339 idr_remove_all(&drm_minors_idr); 340 idr_destroy(&drm_minors_idr); 341} 342 343module_init(drm_core_init); 344module_exit(drm_core_exit); 345 346/** 347 * Copy and IOCTL return string to user space 348 */ 349static int drm_copy_field(char *buf, size_t *buf_len, const char *value) 350{ 351 int len; 352 353 /* don't overflow userbuf */ 354 len = strlen(value); 355 if (len > *buf_len) 356 len = *buf_len; 357 358 /* let userspace know exact length of driver value (which could be 359 * larger than the userspace-supplied buffer) */ 360 *buf_len = strlen(value); 361 362 /* finally, try filling in the userbuf */ 363 if (len && buf) 364 if (copy_to_user(buf, value, len)) 365 return -EFAULT; 366 return 0; 367} 368 369/** 370 * Get version information 371 * 372 * \param inode device inode. 373 * \param filp file pointer. 374 * \param cmd command. 375 * \param arg user argument, pointing to a drm_version structure. 376 * \return zero on success or negative number on failure. 377 * 378 * Fills in the version information in \p arg. 379 */ 380static int drm_version(struct drm_device *dev, void *data, 381 struct drm_file *file_priv) 382{ 383 struct drm_version *version = data; 384 int err; 385 386 version->version_major = dev->driver->major; 387 version->version_minor = dev->driver->minor; 388 version->version_patchlevel = dev->driver->patchlevel; 389 err = drm_copy_field(version->name, &version->name_len, 390 dev->driver->name); 391 if (!err) 392 err = drm_copy_field(version->date, &version->date_len, 393 dev->driver->date); 394 if (!err) 395 err = drm_copy_field(version->desc, &version->desc_len, 396 dev->driver->desc); 397 398 return err; 399} 400 401/** 402 * Called whenever a process performs an ioctl on /dev/drm. 403 * 404 * \param inode device inode. 405 * \param file_priv DRM file private. 406 * \param cmd command. 407 * \param arg user argument. 408 * \return zero on success or negative number on failure. 409 * 410 * Looks up the ioctl function in the ::ioctls table, checking for root 411 * previleges if so required, and dispatches to the respective function. 412 */ 413long drm_ioctl(struct file *filp, 414 unsigned int cmd, unsigned long arg) 415{ 416 struct drm_file *file_priv = filp->private_data; 417 struct drm_device *dev; 418 struct drm_ioctl_desc *ioctl; 419 drm_ioctl_t *func; 420 unsigned int nr = DRM_IOCTL_NR(cmd); 421 int retcode = -EINVAL; 422 char stack_kdata[128]; 423 char *kdata = NULL; 424 425 dev = file_priv->minor->dev; 426 atomic_inc(&dev->ioctl_count); 427 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]); 428 ++file_priv->ioctl_count; 429 430 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n", 431 task_pid_nr(current), cmd, nr, 432 (long)old_encode_dev(file_priv->minor->device), 433 file_priv->authenticated); 434 435 if ((nr >= DRM_CORE_IOCTL_COUNT) && 436 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 437 goto err_i1; 438 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 439 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) 440 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 441 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 442 ioctl = &drm_ioctls[nr]; 443 cmd = ioctl->cmd; 444 } else 445 goto err_i1; 446 447 /* Do not trust userspace, use our own definition */ 448 func = ioctl->func; 449 /* is there a local override? */ 450 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl) 451 func = dev->driver->dma_ioctl; 452 453 if (!func) { 454 DRM_DEBUG("no function\n"); 455 retcode = -EINVAL; 456 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) || 457 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) || 458 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) || 459 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) { 460 retcode = -EACCES; 461 } else { 462 if (cmd & (IOC_IN | IOC_OUT)) { 463 if (_IOC_SIZE(cmd) <= sizeof(stack_kdata)) { 464 kdata = stack_kdata; 465 } else { 466 kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 467 if (!kdata) { 468 retcode = -ENOMEM; 469 goto err_i1; 470 } 471 } 472 } 473 474 if (cmd & IOC_IN) { 475 if (copy_from_user(kdata, (void __user *)arg, 476 _IOC_SIZE(cmd)) != 0) { 477 retcode = -EFAULT; 478 goto err_i1; 479 } 480 } 481 if (ioctl->flags & DRM_UNLOCKED) 482 retcode = func(dev, kdata, file_priv); 483 else { 484 mutex_lock(&drm_global_mutex); 485 retcode = func(dev, kdata, file_priv); 486 mutex_unlock(&drm_global_mutex); 487 } 488 489 if (cmd & IOC_OUT) { 490 if (copy_to_user((void __user *)arg, kdata, 491 _IOC_SIZE(cmd)) != 0) 492 retcode = -EFAULT; 493 } 494 } 495 496 err_i1: 497 if (kdata != stack_kdata) 498 kfree(kdata); 499 atomic_dec(&dev->ioctl_count); 500 if (retcode) 501 DRM_DEBUG("ret = %x\n", retcode); 502 return retcode; 503} 504 505EXPORT_SYMBOL(drm_ioctl); 506 507struct drm_local_map *drm_getsarea(struct drm_device *dev) 508{ 509 struct drm_map_list *entry; 510 511 list_for_each_entry(entry, &dev->maplist, head) { 512 if (entry->map && entry->map->type == _DRM_SHM && 513 (entry->map->flags & _DRM_CONTAINS_LOCK)) { 514 return entry->map; 515 } 516 } 517 return NULL; 518} 519EXPORT_SYMBOL(drm_getsarea); 520