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 <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, .name = #ioctl} 61 62 /** Ioctl table */ 63 static const struct drm_ioctl_desc drm_ioctls[] = { 64 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED|DRM_RENDER_ALLOW), 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|DRM_RENDER_ALLOW), 72 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 73 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 74 75 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 76 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 77 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 78 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 79 80 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 81 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH), 82 83 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 84 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH), 85 86 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 87 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 88 89 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY), 90 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 91 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 92 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH), 93 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 94 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 95 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH), 96 97 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 98 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 99 100 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH), 101 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH), 102 103 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 104 105 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 106 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 107 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH), 108 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH), 109 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH), 110 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_dma_ioctl, 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, 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|DRM_RENDER_ALLOW), 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|DRM_RENDER_ALLOW), 141 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 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_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 154 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, 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 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 170 }; 171 172 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 173 174 /** File operations structure */ 175 static const struct file_operations drm_stub_fops = { 176 .owner = THIS_MODULE, 177 .open = drm_stub_open, 178 .llseek = noop_llseek, 179 }; 180 181 static int __init drm_core_init(void) 182 { 183 int ret = -ENOMEM; 184 185 drm_global_init(); 186 drm_connector_ida_init(); 187 idr_init(&drm_minors_idr); 188 189 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 190 goto err_p1; 191 192 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 193 if (IS_ERR(drm_class)) { 194 printk(KERN_ERR "DRM: Error creating drm class.\n"); 195 ret = PTR_ERR(drm_class); 196 goto err_p2; 197 } 198 199 drm_debugfs_root = debugfs_create_dir("dri", NULL); 200 if (!drm_debugfs_root) { 201 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); 202 ret = -1; 203 goto err_p3; 204 } 205 206 DRM_INFO("Initialized %s %d.%d.%d %s\n", 207 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 208 return 0; 209 err_p3: 210 drm_sysfs_destroy(); 211 err_p2: 212 unregister_chrdev(DRM_MAJOR, "drm"); 213 214 idr_destroy(&drm_minors_idr); 215 err_p1: 216 return ret; 217 } 218 219 static void __exit drm_core_exit(void) 220 { 221 debugfs_remove(drm_debugfs_root); 222 drm_sysfs_destroy(); 223 224 unregister_chrdev(DRM_MAJOR, "drm"); 225 226 drm_connector_ida_destroy(); 227 idr_destroy(&drm_minors_idr); 228 } 229 230 module_init(drm_core_init); 231 module_exit(drm_core_exit); 232 233 /** 234 * Copy and IOCTL return string to user space 235 */ 236 static int drm_copy_field(char *buf, size_t *buf_len, const char *value) 237 { 238 int len; 239 240 /* don't overflow userbuf */ 241 len = strlen(value); 242 if (len > *buf_len) 243 len = *buf_len; 244 245 /* let userspace know exact length of driver value (which could be 246 * larger than the userspace-supplied buffer) */ 247 *buf_len = strlen(value); 248 249 /* finally, try filling in the userbuf */ 250 if (len && buf) 251 if (copy_to_user(buf, value, len)) 252 return -EFAULT; 253 return 0; 254 } 255 256 /** 257 * Get version information 258 * 259 * \param inode device inode. 260 * \param filp file pointer. 261 * \param cmd command. 262 * \param arg user argument, pointing to a drm_version structure. 263 * \return zero on success or negative number on failure. 264 * 265 * Fills in the version information in \p arg. 266 */ 267 static int drm_version(struct drm_device *dev, void *data, 268 struct drm_file *file_priv) 269 { 270 struct drm_version *version = data; 271 int err; 272 273 version->version_major = dev->driver->major; 274 version->version_minor = dev->driver->minor; 275 version->version_patchlevel = dev->driver->patchlevel; 276 err = drm_copy_field(version->name, &version->name_len, 277 dev->driver->name); 278 if (!err) 279 err = drm_copy_field(version->date, &version->date_len, 280 dev->driver->date); 281 if (!err) 282 err = drm_copy_field(version->desc, &version->desc_len, 283 dev->driver->desc); 284 285 return err; 286 } 287 288 /** 289 * drm_ioctl_permit - Check ioctl permissions against caller 290 * 291 * @flags: ioctl permission flags. 292 * @file_priv: Pointer to struct drm_file identifying the caller. 293 * 294 * Checks whether the caller is allowed to run an ioctl with the 295 * indicated permissions. If so, returns zero. Otherwise returns an 296 * error code suitable for ioctl return. 297 */ 298 static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 299 { 300 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 301 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 302 return -EACCES; 303 304 /* AUTH is only for authenticated or render client */ 305 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 306 !file_priv->authenticated)) 307 return -EACCES; 308 309 /* MASTER is only for master or control clients */ 310 if (unlikely((flags & DRM_MASTER) && !file_priv->is_master && 311 !drm_is_control_client(file_priv))) 312 return -EACCES; 313 314 /* Control clients must be explicitly allowed */ 315 if (unlikely(!(flags & DRM_CONTROL_ALLOW) && 316 drm_is_control_client(file_priv))) 317 return -EACCES; 318 319 /* Render clients must be explicitly allowed */ 320 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 321 drm_is_render_client(file_priv))) 322 return -EACCES; 323 324 return 0; 325 } 326 327 /** 328 * Called whenever a process performs an ioctl on /dev/drm. 329 * 330 * \param inode device inode. 331 * \param file_priv DRM file private. 332 * \param cmd command. 333 * \param arg user argument. 334 * \return zero on success or negative number on failure. 335 * 336 * Looks up the ioctl function in the ::ioctls table, checking for root 337 * previleges if so required, and dispatches to the respective function. 338 */ 339 long drm_ioctl(struct file *filp, 340 unsigned int cmd, unsigned long arg) 341 { 342 struct drm_file *file_priv = filp->private_data; 343 struct drm_device *dev; 344 const struct drm_ioctl_desc *ioctl = NULL; 345 drm_ioctl_t *func; 346 unsigned int nr = DRM_IOCTL_NR(cmd); 347 int retcode = -EINVAL; 348 char stack_kdata[128]; 349 char *kdata = NULL; 350 unsigned int usize, asize; 351 352 dev = file_priv->minor->dev; 353 354 if (drm_device_is_unplugged(dev)) 355 return -ENODEV; 356 357 if ((nr >= DRM_CORE_IOCTL_COUNT) && 358 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 359 goto err_i1; 360 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 361 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) { 362 u32 drv_size; 363 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 364 drv_size = _IOC_SIZE(ioctl->cmd_drv); 365 usize = asize = _IOC_SIZE(cmd); 366 if (drv_size > asize) 367 asize = drv_size; 368 cmd = ioctl->cmd_drv; 369 } 370 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 371 u32 drv_size; 372 373 ioctl = &drm_ioctls[nr]; 374 375 drv_size = _IOC_SIZE(ioctl->cmd); 376 usize = asize = _IOC_SIZE(cmd); 377 if (drv_size > asize) 378 asize = drv_size; 379 380 cmd = ioctl->cmd; 381 } else 382 goto err_i1; 383 384 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 385 task_pid_nr(current), 386 (long)old_encode_dev(file_priv->minor->kdev->devt), 387 file_priv->authenticated, ioctl->name); 388 389 /* Do not trust userspace, use our own definition */ 390 func = ioctl->func; 391 392 if (unlikely(!func)) { 393 DRM_DEBUG("no function\n"); 394 retcode = -EINVAL; 395 goto err_i1; 396 } 397 398 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 399 if (unlikely(retcode)) 400 goto err_i1; 401 402 if (cmd & (IOC_IN | IOC_OUT)) { 403 if (asize <= sizeof(stack_kdata)) { 404 kdata = stack_kdata; 405 } else { 406 kdata = kmalloc(asize, GFP_KERNEL); 407 if (!kdata) { 408 retcode = -ENOMEM; 409 goto err_i1; 410 } 411 } 412 if (asize > usize) 413 memset(kdata + usize, 0, asize - usize); 414 } 415 416 if (cmd & IOC_IN) { 417 if (copy_from_user(kdata, (void __user *)arg, 418 usize) != 0) { 419 retcode = -EFAULT; 420 goto err_i1; 421 } 422 } else 423 memset(kdata, 0, usize); 424 425 if (ioctl->flags & DRM_UNLOCKED) 426 retcode = func(dev, kdata, file_priv); 427 else { 428 mutex_lock(&drm_global_mutex); 429 retcode = func(dev, kdata, file_priv); 430 mutex_unlock(&drm_global_mutex); 431 } 432 433 if (cmd & IOC_OUT) { 434 if (copy_to_user((void __user *)arg, kdata, 435 usize) != 0) 436 retcode = -EFAULT; 437 } 438 439 err_i1: 440 if (!ioctl) 441 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 442 task_pid_nr(current), 443 (long)old_encode_dev(file_priv->minor->kdev->devt), 444 file_priv->authenticated, cmd, nr); 445 446 if (kdata != stack_kdata) 447 kfree(kdata); 448 if (retcode) 449 DRM_DEBUG("ret = %d\n", retcode); 450 return retcode; 451 } 452 EXPORT_SYMBOL(drm_ioctl); 453 454 /** 455 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 456 * 457 * @nr: Ioctl number. 458 * @flags: Where to return the ioctl permission flags 459 */ 460 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 461 { 462 if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) || 463 (nr < DRM_COMMAND_BASE)) { 464 *flags = drm_ioctls[nr].flags; 465 return true; 466 } 467 468 return false; 469 } 470 EXPORT_SYMBOL(drm_ioctl_flags); 471