drm_drv.c revision 1.1
1 /** 2 * \file drm_drv.c 3 * Generic driver template 4 * 5 * \author Rickard E. (Rik) Faith <faith (at) valinux.com> 6 * \author Gareth Hughes <gareth (at) 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 (at) 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 <linux/export.h> 52 #include <drm/drmP.h> 53 #include <drm/drm_core.h> 54 55 56 static int drm_version(struct drm_device *dev, void *data, 57 struct drm_file *file_priv); 58 59 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 60 [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0} 61 62 /** Ioctl table */ 63 static struct drm_ioctl_desc drm_ioctls[] = { 64 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED), 65 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 66 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 67 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 68 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED), 69 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), 70 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), 71 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED), 72 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 73 74 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 75 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 76 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 77 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 78 79 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 80 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH), 81 82 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 83 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH), 84 85 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 86 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 87 88 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY), 89 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 90 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 91 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH), 92 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 93 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 94 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH), 95 96 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 97 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 98 99 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH), 100 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH), 101 102 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 103 104 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 105 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 106 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH), 107 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH), 108 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH), 109 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */ 110 DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH), 111 112 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 113 114 #if __OS_HAS_AGP 115 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 116 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 117 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 118 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 119 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 120 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 121 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 122 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 123 #endif 124 125 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 126 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 127 128 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED), 129 130 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 131 132 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 133 134 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED), 135 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 136 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 137 138 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 139 140 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED), 141 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED), 142 143 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 144 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 145 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 146 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 147 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 148 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 149 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), 150 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 151 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 152 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 153 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 154 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 155 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 156 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 157 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 158 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 159 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 160 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 161 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 162 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 163 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 164 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 165 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 166 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 167 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 168 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 169 }; 170 171 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 172 173 /** 174 * Take down the DRM device. 175 * 176 * \param dev DRM device structure. 177 * 178 * Frees every resource in \p dev. 179 * 180 * \sa drm_device 181 */ 182 int drm_lastclose(struct drm_device * dev) 183 { 184 struct drm_vma_entry *vma, *vma_temp; 185 186 DRM_DEBUG("\n"); 187 188 if (dev->driver->lastclose) 189 dev->driver->lastclose(dev); 190 DRM_DEBUG("driver lastclose completed\n"); 191 192 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET)) 193 drm_irq_uninstall(dev); 194 195 mutex_lock(&dev->struct_mutex); 196 197 /* Clear AGP information */ 198 if (drm_core_has_AGP(dev) && dev->agp && 199 !drm_core_check_feature(dev, DRIVER_MODESET)) { 200 struct drm_agp_mem *entry, *tempe; 201 202 /* Remove AGP resources, but leave dev->agp 203 intact until drv_cleanup is called. */ 204 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) { 205 if (entry->bound) 206 drm_unbind_agp(entry->memory); 207 drm_free_agp(entry->memory, entry->pages); 208 kfree(entry); 209 } 210 INIT_LIST_HEAD(&dev->agp->memory); 211 212 if (dev->agp->acquired) 213 drm_agp_release(dev); 214 215 dev->agp->acquired = 0; 216 dev->agp->enabled = 0; 217 } 218 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg && 219 !drm_core_check_feature(dev, DRIVER_MODESET)) { 220 drm_sg_cleanup(dev->sg); 221 dev->sg = NULL; 222 } 223 224 /* Clear vma list (only built for debugging) */ 225 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { 226 list_del(&vma->head); 227 kfree(vma); 228 } 229 230 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && 231 !drm_core_check_feature(dev, DRIVER_MODESET)) 232 drm_dma_takedown(dev); 233 234 dev->dev_mapping = NULL; 235 mutex_unlock(&dev->struct_mutex); 236 237 DRM_DEBUG("lastclose completed\n"); 238 return 0; 239 } 240 241 /** File operations structure */ 242 static const struct file_operations drm_stub_fops = { 243 .owner = THIS_MODULE, 244 .open = drm_stub_open, 245 .llseek = noop_llseek, 246 }; 247 248 static int __init drm_core_init(void) 249 { 250 int ret = -ENOMEM; 251 252 drm_global_init(); 253 idr_init(&drm_minors_idr); 254 255 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 256 goto err_p1; 257 258 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 259 if (IS_ERR(drm_class)) { 260 printk(KERN_ERR "DRM: Error creating drm class.\n"); 261 ret = PTR_ERR(drm_class); 262 goto err_p2; 263 } 264 265 drm_proc_root = proc_mkdir("dri", NULL); 266 if (!drm_proc_root) { 267 DRM_ERROR("Cannot create /proc/dri\n"); 268 ret = -1; 269 goto err_p3; 270 } 271 272 drm_debugfs_root = debugfs_create_dir("dri", NULL); 273 if (!drm_debugfs_root) { 274 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); 275 ret = -1; 276 goto err_p3; 277 } 278 279 DRM_INFO("Initialized %s %d.%d.%d %s\n", 280 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 281 return 0; 282 err_p3: 283 drm_sysfs_destroy(); 284 err_p2: 285 unregister_chrdev(DRM_MAJOR, "drm"); 286 287 idr_destroy(&drm_minors_idr); 288 err_p1: 289 return ret; 290 } 291 292 static void __exit drm_core_exit(void) 293 { 294 remove_proc_entry("dri", NULL); 295 debugfs_remove(drm_debugfs_root); 296 drm_sysfs_destroy(); 297 298 unregister_chrdev(DRM_MAJOR, "drm"); 299 300 idr_remove_all(&drm_minors_idr); 301 idr_destroy(&drm_minors_idr); 302 } 303 304 module_init(drm_core_init); 305 module_exit(drm_core_exit); 306 307 /** 308 * Copy and IOCTL return string to user space 309 */ 310 static int drm_copy_field(char *buf, size_t *buf_len, const char *value) 311 { 312 int len; 313 314 /* don't overflow userbuf */ 315 len = strlen(value); 316 if (len > *buf_len) 317 len = *buf_len; 318 319 /* let userspace know exact length of driver value (which could be 320 * larger than the userspace-supplied buffer) */ 321 *buf_len = strlen(value); 322 323 /* finally, try filling in the userbuf */ 324 if (len && buf) 325 if (copy_to_user(buf, value, len)) 326 return -EFAULT; 327 return 0; 328 } 329 330 /** 331 * Get version information 332 * 333 * \param inode device inode. 334 * \param filp file pointer. 335 * \param cmd command. 336 * \param arg user argument, pointing to a drm_version structure. 337 * \return zero on success or negative number on failure. 338 * 339 * Fills in the version information in \p arg. 340 */ 341 static int drm_version(struct drm_device *dev, void *data, 342 struct drm_file *file_priv) 343 { 344 struct drm_version *version = data; 345 int err; 346 347 version->version_major = dev->driver->major; 348 version->version_minor = dev->driver->minor; 349 version->version_patchlevel = dev->driver->patchlevel; 350 err = drm_copy_field(version->name, &version->name_len, 351 dev->driver->name); 352 if (!err) 353 err = drm_copy_field(version->date, &version->date_len, 354 dev->driver->date); 355 if (!err) 356 err = drm_copy_field(version->desc, &version->desc_len, 357 dev->driver->desc); 358 359 return err; 360 } 361 362 /** 363 * Called whenever a process performs an ioctl on /dev/drm. 364 * 365 * \param inode device inode. 366 * \param file_priv DRM file private. 367 * \param cmd command. 368 * \param arg user argument. 369 * \return zero on success or negative number on failure. 370 * 371 * Looks up the ioctl function in the ::ioctls table, checking for root 372 * previleges if so required, and dispatches to the respective function. 373 */ 374 long drm_ioctl(struct file *filp, 375 unsigned int cmd, unsigned long arg) 376 { 377 struct drm_file *file_priv = filp->private_data; 378 struct drm_device *dev; 379 struct drm_ioctl_desc *ioctl; 380 drm_ioctl_t *func; 381 unsigned int nr = DRM_IOCTL_NR(cmd); 382 int retcode = -EINVAL; 383 char stack_kdata[128]; 384 char *kdata = NULL; 385 unsigned int usize, asize; 386 387 dev = file_priv->minor->dev; 388 389 if (drm_device_is_unplugged(dev)) 390 return -ENODEV; 391 392 atomic_inc(&dev->ioctl_count); 393 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]); 394 ++file_priv->ioctl_count; 395 396 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n", 397 task_pid_nr(current), cmd, nr, 398 (long)old_encode_dev(file_priv->minor->device), 399 file_priv->authenticated); 400 401 if ((nr >= DRM_CORE_IOCTL_COUNT) && 402 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 403 goto err_i1; 404 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 405 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) { 406 u32 drv_size; 407 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 408 drv_size = _IOC_SIZE(ioctl->cmd_drv); 409 usize = asize = _IOC_SIZE(cmd); 410 if (drv_size > asize) 411 asize = drv_size; 412 } 413 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 414 ioctl = &drm_ioctls[nr]; 415 cmd = ioctl->cmd; 416 usize = asize = _IOC_SIZE(cmd); 417 } else 418 goto err_i1; 419 420 /* Do not trust userspace, use our own definition */ 421 func = ioctl->func; 422 /* is there a local override? */ 423 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl) 424 func = dev->driver->dma_ioctl; 425 426 if (!func) { 427 DRM_DEBUG("no function\n"); 428 retcode = -EINVAL; 429 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) || 430 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) || 431 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) || 432 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) { 433 retcode = -EACCES; 434 } else { 435 if (cmd & (IOC_IN | IOC_OUT)) { 436 if (asize <= sizeof(stack_kdata)) { 437 kdata = stack_kdata; 438 } else { 439 kdata = kmalloc(asize, GFP_KERNEL); 440 if (!kdata) { 441 retcode = -ENOMEM; 442 goto err_i1; 443 } 444 } 445 if (asize > usize) 446 memset(kdata + usize, 0, asize - usize); 447 } 448 449 if (cmd & IOC_IN) { 450 if (copy_from_user(kdata, (void __user *)arg, 451 usize) != 0) { 452 retcode = -EFAULT; 453 goto err_i1; 454 } 455 } else 456 memset(kdata, 0, usize); 457 458 if (ioctl->flags & DRM_UNLOCKED) 459 retcode = func(dev, kdata, file_priv); 460 else { 461 mutex_lock(&drm_global_mutex); 462 retcode = func(dev, kdata, file_priv); 463 mutex_unlock(&drm_global_mutex); 464 } 465 466 if (cmd & IOC_OUT) { 467 if (copy_to_user((void __user *)arg, kdata, 468 usize) != 0) 469 retcode = -EFAULT; 470 } 471 } 472 473 err_i1: 474 if (kdata != stack_kdata) 475 kfree(kdata); 476 atomic_dec(&dev->ioctl_count); 477 if (retcode) 478 DRM_DEBUG("ret = %d\n", retcode); 479 return retcode; 480 } 481 482 EXPORT_SYMBOL(drm_ioctl); 483 484 struct drm_local_map *drm_getsarea(struct drm_device *dev) 485 { 486 struct drm_map_list *entry; 487 488 list_for_each_entry(entry, &dev->maplist, head) { 489 if (entry->map && entry->map->type == _DRM_SHM && 490 (entry->map->flags & _DRM_CONTAINS_LOCK)) { 491 return entry->map; 492 } 493 } 494 return NULL; 495 } 496 EXPORT_SYMBOL(drm_getsarea); 497
Indexes created Fri Sep 26 08:10:20 GMT 2025