drm_drv.c revision e2e99a8206bcce6f2d3d72ff8be42859f98dbcda
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 56static 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 */ 63static const 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_noop, 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, 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_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/** 175 * Take down the DRM device. 176 * 177 * \param dev DRM device structure. 178 * 179 * Frees every resource in \p dev. 180 * 181 * \sa drm_device 182 */ 183int drm_lastclose(struct drm_device * dev) 184{ 185 struct drm_vma_entry *vma, *vma_temp; 186 187 DRM_DEBUG("\n"); 188 189 if (dev->driver->lastclose) 190 dev->driver->lastclose(dev); 191 DRM_DEBUG("driver lastclose completed\n"); 192 193 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET)) 194 drm_irq_uninstall(dev); 195 196 mutex_lock(&dev->struct_mutex); 197 198 drm_agp_clear(dev); 199 200 drm_legacy_sg_cleanup(dev); 201 202 /* Clear vma list (only built for debugging) */ 203 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { 204 list_del(&vma->head); 205 kfree(vma); 206 } 207 208 drm_legacy_dma_takedown(dev); 209 210 dev->dev_mapping = NULL; 211 mutex_unlock(&dev->struct_mutex); 212 213 DRM_DEBUG("lastclose completed\n"); 214 return 0; 215} 216 217/** File operations structure */ 218static const struct file_operations drm_stub_fops = { 219 .owner = THIS_MODULE, 220 .open = drm_stub_open, 221 .llseek = noop_llseek, 222}; 223 224static int __init drm_core_init(void) 225{ 226 int ret = -ENOMEM; 227 228 drm_global_init(); 229 idr_init(&drm_minors_idr); 230 231 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 232 goto err_p1; 233 234 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 235 if (IS_ERR(drm_class)) { 236 printk(KERN_ERR "DRM: Error creating drm class.\n"); 237 ret = PTR_ERR(drm_class); 238 goto err_p2; 239 } 240 241 drm_proc_root = proc_mkdir("dri", NULL); 242 if (!drm_proc_root) { 243 DRM_ERROR("Cannot create /proc/dri\n"); 244 ret = -1; 245 goto err_p3; 246 } 247 248 drm_debugfs_root = debugfs_create_dir("dri", NULL); 249 if (!drm_debugfs_root) { 250 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); 251 ret = -1; 252 goto err_p3; 253 } 254 255 DRM_INFO("Initialized %s %d.%d.%d %s\n", 256 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 257 return 0; 258err_p3: 259 drm_sysfs_destroy(); 260err_p2: 261 unregister_chrdev(DRM_MAJOR, "drm"); 262 263 idr_destroy(&drm_minors_idr); 264err_p1: 265 return ret; 266} 267 268static void __exit drm_core_exit(void) 269{ 270 remove_proc_entry("dri", NULL); 271 debugfs_remove(drm_debugfs_root); 272 drm_sysfs_destroy(); 273 274 unregister_chrdev(DRM_MAJOR, "drm"); 275 276 idr_destroy(&drm_minors_idr); 277} 278 279module_init(drm_core_init); 280module_exit(drm_core_exit); 281 282/** 283 * Copy and IOCTL return string to user space 284 */ 285static int drm_copy_field(char *buf, size_t *buf_len, const char *value) 286{ 287 int len; 288 289 /* don't overflow userbuf */ 290 len = strlen(value); 291 if (len > *buf_len) 292 len = *buf_len; 293 294 /* let userspace know exact length of driver value (which could be 295 * larger than the userspace-supplied buffer) */ 296 *buf_len = strlen(value); 297 298 /* finally, try filling in the userbuf */ 299 if (len && buf) 300 if (copy_to_user(buf, value, len)) 301 return -EFAULT; 302 return 0; 303} 304 305/** 306 * Get version information 307 * 308 * \param inode device inode. 309 * \param filp file pointer. 310 * \param cmd command. 311 * \param arg user argument, pointing to a drm_version structure. 312 * \return zero on success or negative number on failure. 313 * 314 * Fills in the version information in \p arg. 315 */ 316static int drm_version(struct drm_device *dev, void *data, 317 struct drm_file *file_priv) 318{ 319 struct drm_version *version = data; 320 int err; 321 322 version->version_major = dev->driver->major; 323 version->version_minor = dev->driver->minor; 324 version->version_patchlevel = dev->driver->patchlevel; 325 err = drm_copy_field(version->name, &version->name_len, 326 dev->driver->name); 327 if (!err) 328 err = drm_copy_field(version->date, &version->date_len, 329 dev->driver->date); 330 if (!err) 331 err = drm_copy_field(version->desc, &version->desc_len, 332 dev->driver->desc); 333 334 return err; 335} 336 337/** 338 * Called whenever a process performs an ioctl on /dev/drm. 339 * 340 * \param inode device inode. 341 * \param file_priv DRM file private. 342 * \param cmd command. 343 * \param arg user argument. 344 * \return zero on success or negative number on failure. 345 * 346 * Looks up the ioctl function in the ::ioctls table, checking for root 347 * previleges if so required, and dispatches to the respective function. 348 */ 349long drm_ioctl(struct file *filp, 350 unsigned int cmd, unsigned long arg) 351{ 352 struct drm_file *file_priv = filp->private_data; 353 struct drm_device *dev; 354 const struct drm_ioctl_desc *ioctl = NULL; 355 drm_ioctl_t *func; 356 unsigned int nr = DRM_IOCTL_NR(cmd); 357 int retcode = -EINVAL; 358 char stack_kdata[128]; 359 char *kdata = NULL; 360 unsigned int usize, asize; 361 362 dev = file_priv->minor->dev; 363 364 if (drm_device_is_unplugged(dev)) 365 return -ENODEV; 366 367 atomic_inc(&dev->ioctl_count); 368 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]); 369 ++file_priv->ioctl_count; 370 371 if ((nr >= DRM_CORE_IOCTL_COUNT) && 372 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 373 goto err_i1; 374 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 375 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) { 376 u32 drv_size; 377 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 378 drv_size = _IOC_SIZE(ioctl->cmd_drv); 379 usize = asize = _IOC_SIZE(cmd); 380 if (drv_size > asize) 381 asize = drv_size; 382 cmd = ioctl->cmd_drv; 383 } 384 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 385 ioctl = &drm_ioctls[nr]; 386 cmd = ioctl->cmd; 387 usize = asize = _IOC_SIZE(cmd); 388 } else 389 goto err_i1; 390 391 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 392 task_pid_nr(current), 393 (long)old_encode_dev(file_priv->minor->device), 394 file_priv->authenticated, ioctl->name); 395 396 /* Do not trust userspace, use our own definition */ 397 func = ioctl->func; 398 /* is there a local override? */ 399 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl) 400 func = dev->driver->dma_ioctl; 401 402 if (!func) { 403 DRM_DEBUG("no function\n"); 404 retcode = -EINVAL; 405 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) || 406 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) || 407 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) || 408 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) { 409 retcode = -EACCES; 410 } else { 411 if (cmd & (IOC_IN | IOC_OUT)) { 412 if (asize <= sizeof(stack_kdata)) { 413 kdata = stack_kdata; 414 } else { 415 kdata = kmalloc(asize, GFP_KERNEL); 416 if (!kdata) { 417 retcode = -ENOMEM; 418 goto err_i1; 419 } 420 } 421 if (asize > usize) 422 memset(kdata + usize, 0, asize - usize); 423 } 424 425 if (cmd & IOC_IN) { 426 if (copy_from_user(kdata, (void __user *)arg, 427 usize) != 0) { 428 retcode = -EFAULT; 429 goto err_i1; 430 } 431 } else 432 memset(kdata, 0, usize); 433 434 if (ioctl->flags & DRM_UNLOCKED) 435 retcode = func(dev, kdata, file_priv); 436 else { 437 mutex_lock(&drm_global_mutex); 438 retcode = func(dev, kdata, file_priv); 439 mutex_unlock(&drm_global_mutex); 440 } 441 442 if (cmd & IOC_OUT) { 443 if (copy_to_user((void __user *)arg, kdata, 444 usize) != 0) 445 retcode = -EFAULT; 446 } 447 } 448 449 err_i1: 450 if (!ioctl) 451 DRM_DEBUG("invalid iotcl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 452 task_pid_nr(current), 453 (long)old_encode_dev(file_priv->minor->device), 454 file_priv->authenticated, cmd, nr); 455 456 if (kdata != stack_kdata) 457 kfree(kdata); 458 atomic_dec(&dev->ioctl_count); 459 if (retcode) 460 DRM_DEBUG("ret = %d\n", retcode); 461 return retcode; 462} 463EXPORT_SYMBOL(drm_ioctl); 464