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 55 static int drm_version(struct drm_device *dev, void *data, 56 struct drm_file *file_priv); 57 58 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 59 [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0} 60 61 /** Ioctl table */ 62 static struct drm_ioctl_desc drm_ioctls[] = { 63 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0), 64 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 65 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 66 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 67 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0), 68 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0), 69 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0), 70 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 71 72 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 73 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 74 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 75 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 76 77 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 78 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH), 79 80 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 81 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH), 82 83 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 84 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 85 86 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY), 87 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 88 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 89 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH), 90 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 91 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 92 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH), 93 94 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 95 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 96 97 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH), 98 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH), 99 100 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 101 102 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 103 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 104 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH), 105 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH), 106 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH), 107 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */ 108 DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH), 109 110 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 111 112 #if __OS_HAS_AGP 113 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 114 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 115 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 116 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 117 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 118 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 119 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 120 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 121 #endif 122 123 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 124 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 125 126 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0), 127 128 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 129 130 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 131 132 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED), 133 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 134 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 135 136 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 137 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 138 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 139 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 140 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER|DRM_UNLOCKED), 141 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 142 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 143 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 144 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 145 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 146 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW|DRM_UNLOCKED), 147 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 148 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 149 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 150 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 151 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 152 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 153 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 154 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 155 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 156 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED) 157 }; 158 159 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 160 161 /** 162 * Take down the DRM device. 163 * 164 * \param dev DRM device structure. 165 * 166 * Frees every resource in \p dev. 167 * 168 * \sa drm_device 169 */ 170 int drm_lastclose(struct drm_device * dev) 171 { 172 struct drm_vma_entry *vma, *vma_temp; 173 int i; 174 175 DRM_DEBUG("\n"); 176 177 if (dev->driver->lastclose) 178 dev->driver->lastclose(dev); 179 DRM_DEBUG("driver lastclose completed\n"); 180 181 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET)) 182 drm_irq_uninstall(dev); 183 184 mutex_lock(&dev->struct_mutex); 185 186 /* Clear AGP information */ 187 if (drm_core_has_AGP(dev) && dev->agp && 188 !drm_core_check_feature(dev, DRIVER_MODESET)) { 189 struct drm_agp_mem *entry, *tempe; 190 191 /* Remove AGP resources, but leave dev->agp 192 intact until drv_cleanup is called. */ 193 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) { 194 if (entry->bound) 195 drm_unbind_agp(entry->memory); 196 drm_free_agp(entry->memory, entry->pages); 197 kfree(entry); 198 } 199 INIT_LIST_HEAD(&dev->agp->memory); 200 201 if (dev->agp->acquired) 202 drm_agp_release(dev); 203 204 dev->agp->acquired = 0; 205 dev->agp->enabled = 0; 206 } 207 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg && 208 !drm_core_check_feature(dev, DRIVER_MODESET)) { 209 drm_sg_cleanup(dev->sg); 210 dev->sg = NULL; 211 } 212 213 /* Clear vma list (only built for debugging) */ 214 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { 215 list_del(&vma->head); 216 kfree(vma); 217 } 218 219 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) { 220 for (i = 0; i < dev->queue_count; i++) { 221 kfree(dev->queuelist[i]); 222 dev->queuelist[i] = NULL; 223 } 224 kfree(dev->queuelist); 225 dev->queuelist = NULL; 226 } 227 dev->queue_count = 0; 228 229 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && 230 !drm_core_check_feature(dev, DRIVER_MODESET)) 231 drm_dma_takedown(dev); 232 233 dev->dev_mapping = NULL; 234 mutex_unlock(&dev->struct_mutex); 235 236 DRM_DEBUG("lastclose completed\n"); 237 return 0; 238 } 239 240 /** File operations structure */ 241 static const struct file_operations drm_stub_fops = { 242 .owner = THIS_MODULE, 243 .open = drm_stub_open, 244 .llseek = noop_llseek, 245 }; 246 247 static int __init drm_core_init(void) 248 { 249 int ret = -ENOMEM; 250 251 drm_global_init(); 252 idr_init(&drm_minors_idr); 253 254 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 255 goto err_p1; 256 257 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 258 if (IS_ERR(drm_class)) { 259 printk(KERN_ERR "DRM: Error creating drm class.\n"); 260 ret = PTR_ERR(drm_class); 261 goto err_p2; 262 } 263 264 drm_proc_root = proc_mkdir("dri", NULL); 265 if (!drm_proc_root) { 266 DRM_ERROR("Cannot create /proc/dri\n"); 267 ret = -1; 268 goto err_p3; 269 } 270 271 drm_debugfs_root = debugfs_create_dir("dri", NULL); 272 if (!drm_debugfs_root) { 273 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); 274 ret = -1; 275 goto err_p3; 276 } 277 278 DRM_INFO("Initialized %s %d.%d.%d %s\n", 279 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 280 return 0; 281 err_p3: 282 drm_sysfs_destroy(); 283 err_p2: 284 unregister_chrdev(DRM_MAJOR, "drm"); 285 286 idr_destroy(&drm_minors_idr); 287 err_p1: 288 return ret; 289 } 290 291 static void __exit drm_core_exit(void) 292 { 293 remove_proc_entry("dri", NULL); 294 debugfs_remove(drm_debugfs_root); 295 drm_sysfs_destroy(); 296 297 unregister_chrdev(DRM_MAJOR, "drm"); 298 299 idr_remove_all(&drm_minors_idr); 300 idr_destroy(&drm_minors_idr); 301 } 302 303 module_init(drm_core_init); 304 module_exit(drm_core_exit); 305 306 /** 307 * Copy and IOCTL return string to user space 308 */ 309 static int drm_copy_field(char *buf, size_t *buf_len, const char *value) 310 { 311 int len; 312 313 /* don't overflow userbuf */ 314 len = strlen(value); 315 if (len > *buf_len) 316 len = *buf_len; 317 318 /* let userspace know exact length of driver value (which could be 319 * larger than the userspace-supplied buffer) */ 320 *buf_len = strlen(value); 321 322 /* finally, try filling in the userbuf */ 323 if (len && buf) 324 if (copy_to_user(buf, value, len)) 325 return -EFAULT; 326 return 0; 327 } 328 329 /** 330 * Get version information 331 * 332 * \param inode device inode. 333 * \param filp file pointer. 334 * \param cmd command. 335 * \param arg user argument, pointing to a drm_version structure. 336 * \return zero on success or negative number on failure. 337 * 338 * Fills in the version information in \p arg. 339 */ 340 static int drm_version(struct drm_device *dev, void *data, 341 struct drm_file *file_priv) 342 { 343 struct drm_version *version = data; 344 int err; 345 346 version->version_major = dev->driver->major; 347 version->version_minor = dev->driver->minor; 348 version->version_patchlevel = dev->driver->patchlevel; 349 err = drm_copy_field(version->name, &version->name_len, 350 dev->driver->name); 351 if (!err) 352 err = drm_copy_field(version->date, &version->date_len, 353 dev->driver->date); 354 if (!err) 355 err = drm_copy_field(version->desc, &version->desc_len, 356 dev->driver->desc); 357 358 return err; 359 } 360 361 /** 362 * Called whenever a process performs an ioctl on /dev/drm. 363 * 364 * \param inode device inode. 365 * \param file_priv DRM file private. 366 * \param cmd command. 367 * \param arg user argument. 368 * \return zero on success or negative number on failure. 369 * 370 * Looks up the ioctl function in the ::ioctls table, checking for root 371 * previleges if so required, and dispatches to the respective function. 372 */ 373 long drm_ioctl(struct file *filp, 374 unsigned int cmd, unsigned long arg) 375 { 376 struct drm_file *file_priv = filp->private_data; 377 struct drm_device *dev; 378 struct drm_ioctl_desc *ioctl; 379 drm_ioctl_t *func; 380 unsigned int nr = DRM_IOCTL_NR(cmd); 381 int retcode = -EINVAL; 382 char stack_kdata[128]; 383 char *kdata = NULL; 384 unsigned int usize, asize; 385 386 dev = file_priv->minor->dev; 387 atomic_inc(&dev->ioctl_count); 388 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]); 389 ++file_priv->ioctl_count; 390 391 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n", 392 task_pid_nr(current), cmd, nr, 393 (long)old_encode_dev(file_priv->minor->device), 394 file_priv->authenticated); 395 396 if ((nr >= DRM_CORE_IOCTL_COUNT) && 397 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 398 goto err_i1; 399 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 400 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) { 401 u32 drv_size; 402 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 403 drv_size = _IOC_SIZE(ioctl->cmd_drv); 404 usize = asize = _IOC_SIZE(cmd); 405 if (drv_size > asize) 406 asize = drv_size; 407 } 408 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 409 ioctl = &drm_ioctls[nr]; 410 cmd = ioctl->cmd; 411 usize = asize = _IOC_SIZE(cmd); 412 } else 413 goto err_i1; 414 415 /* Do not trust userspace, use our own definition */ 416 func = ioctl->func; 417 /* is there a local override? */ 418 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl) 419 func = dev->driver->dma_ioctl; 420 421 if (!func) { 422 DRM_DEBUG("no function\n"); 423 retcode = -EINVAL; 424 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) || 425 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) || 426 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) || 427 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) { 428 retcode = -EACCES; 429 } else { 430 if (cmd & (IOC_IN | IOC_OUT)) { 431 if (asize <= sizeof(stack_kdata)) { 432 kdata = stack_kdata; 433 } else { 434 kdata = kmalloc(asize, GFP_KERNEL); 435 if (!kdata) { 436 retcode = -ENOMEM; 437 goto err_i1; 438 } 439 } 440 } 441 442 if (cmd & IOC_IN) { 443 if (copy_from_user(kdata, (void __user *)arg, 444 usize) != 0) { 445 retcode = -EFAULT; 446 goto err_i1; 447 } 448 } else 449 memset(kdata, 0, usize); 450 451 if (ioctl->flags & DRM_UNLOCKED) 452 retcode = func(dev, kdata, file_priv); 453 else { 454 mutex_lock(&drm_global_mutex); 455 retcode = func(dev, kdata, file_priv); 456 mutex_unlock(&drm_global_mutex); 457 } 458 459 if (cmd & IOC_OUT) { 460 if (copy_to_user((void __user *)arg, kdata, 461 usize) != 0) 462 retcode = -EFAULT; 463 } 464 } 465 466 err_i1: 467 if (kdata != stack_kdata) 468 kfree(kdata); 469 atomic_dec(&dev->ioctl_count); 470 if (retcode) 471 DRM_DEBUG("ret = %x\n", retcode); 472 return retcode; 473 } 474 475 EXPORT_SYMBOL(drm_ioctl); 476 477 struct drm_local_map *drm_getsarea(struct drm_device *dev) 478 { 479 struct drm_map_list *entry; 480 481 list_for_each_entry(entry, &dev->maplist, head) { 482 if (entry->map && entry->map->type == _DRM_SHM && 483 (entry->map->flags & _DRM_CONTAINS_LOCK)) { 484 return entry->map; 485 } 486 } 487 return NULL; 488 } 489 EXPORT_SYMBOL(drm_getsarea); 490