1 /* 2 * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com 3 * 4 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 6 * All Rights Reserved. 7 * 8 * Author Rickard E. (Rik) Faith <faith@valinux.com> 9 * Author Gareth Hughes <gareth@valinux.com> 10 * 11 * Permission is hereby granted, free of charge, to any person obtaining a 12 * copy of this software and associated documentation files (the "Software"), 13 * to deal in the Software without restriction, including without limitation 14 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 15 * and/or sell copies of the Software, and to permit persons to whom the 16 * Software is furnished to do so, subject to the following conditions: 17 * 18 * The above copyright notice and this permission notice (including the next 19 * paragraph) shall be included in all copies or substantial portions of the 20 * Software. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 25 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 28 * OTHER DEALINGS IN THE SOFTWARE. 29 */ 30 31 #include <drm/drmP.h> 32 #include <drm/drm_core.h> 33 #include "drm_legacy.h" 34 35 #include <linux/pci.h> 36 #include <linux/export.h> 37 #ifdef CONFIG_X86 38 #include <asm/mtrr.h> 39 #endif 40 41 static int drm_version(struct drm_device *dev, void *data, 42 struct drm_file *file_priv); 43 44 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 45 [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl} 46 47 /** Ioctl table */ 48 static const struct drm_ioctl_desc drm_ioctls[] = { 49 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED|DRM_RENDER_ALLOW), 50 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 51 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 52 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 53 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED), 54 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), 55 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), 56 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), 57 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 58 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 59 60 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 61 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 62 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 63 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 64 65 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 66 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH), 67 68 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 69 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 70 71 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 72 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 73 74 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 75 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 76 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 77 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 78 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 79 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 80 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 81 82 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 83 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 84 85 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH), 86 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH), 87 88 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 89 90 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 91 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 92 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH), 93 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH), 94 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH), 95 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_dma_ioctl, DRM_AUTH), 96 97 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 98 99 #if __OS_HAS_AGP 100 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 101 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 102 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 103 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 104 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 105 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 106 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 107 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 108 #endif 109 110 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 111 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 112 113 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED), 114 115 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 116 117 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 118 119 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), 120 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 121 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 122 123 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 124 125 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 126 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 127 128 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 129 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 130 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 131 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 132 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 133 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 134 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), 135 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 136 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 137 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 138 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 139 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 140 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 141 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 142 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 143 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 144 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 145 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 146 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 147 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 148 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 149 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 150 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 151 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 152 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 153 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 154 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 155 }; 156 157 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 158 159 /** 160 * Get the bus id. 161 * 162 * \param inode device inode. 163 * \param file_priv DRM file private. 164 * \param cmd command. 165 * \param arg user argument, pointing to a drm_unique structure. 166 * \return zero on success or a negative number on failure. 167 * 168 * Copies the bus id from drm_device::unique into user space. 169 */ 170 int drm_getunique(struct drm_device *dev, void *data, 171 struct drm_file *file_priv) 172 { 173 struct drm_unique *u = data; 174 struct drm_master *master = file_priv->master; 175 176 if (u->unique_len >= master->unique_len) { 177 if (copy_to_user(u->unique, master->unique, master->unique_len)) 178 return -EFAULT; 179 } 180 u->unique_len = master->unique_len; 181 182 return 0; 183 } 184 185 static void 186 drm_unset_busid(struct drm_device *dev, 187 struct drm_master *master) 188 { 189 kfree(master->unique); 190 master->unique = NULL; 191 master->unique_len = 0; 192 master->unique_size = 0; 193 } 194 195 /** 196 * Set the bus id. 197 * 198 * \param inode device inode. 199 * \param file_priv DRM file private. 200 * \param cmd command. 201 * \param arg user argument, pointing to a drm_unique structure. 202 * \return zero on success or a negative number on failure. 203 * 204 * Copies the bus id from userspace into drm_device::unique, and verifies that 205 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated 206 * in interface version 1.1 and will return EBUSY when setversion has requested 207 * version 1.1 or greater. Also note that KMS is all version 1.1 and later and 208 * UMS was only ever supported on pci devices. 209 */ 210 int drm_setunique(struct drm_device *dev, void *data, 211 struct drm_file *file_priv) 212 { 213 struct drm_unique *u = data; 214 struct drm_master *master = file_priv->master; 215 int ret; 216 217 if (master->unique_len || master->unique) 218 return -EBUSY; 219 220 if (!u->unique_len || u->unique_len > 1024) 221 return -EINVAL; 222 223 if (drm_core_check_feature(dev, DRIVER_MODESET)) 224 return 0; 225 226 if (WARN_ON(!dev->pdev)) 227 return -EINVAL; 228 229 ret = drm_pci_set_unique(dev, master, u); 230 if (ret) 231 goto err; 232 233 return 0; 234 235 err: 236 drm_unset_busid(dev, master); 237 return ret; 238 } 239 240 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 241 { 242 struct drm_master *master = file_priv->master; 243 int ret; 244 245 if (master->unique != NULL) 246 drm_unset_busid(dev, master); 247 248 if (dev->driver->bus && dev->driver->bus->set_busid) { 249 ret = dev->driver->bus->set_busid(dev, master); 250 if (ret) { 251 drm_unset_busid(dev, master); 252 return ret; 253 } 254 } else { 255 if (WARN(dev->unique == NULL, 256 "No drm_bus.set_busid() implementation provided by " 257 "%ps. Use drm_dev_set_unique() to set the unique " 258 "name explicitly.", dev->driver)) 259 return -EINVAL; 260 261 master->unique = kstrdup(dev->unique, GFP_KERNEL); 262 if (master->unique) 263 master->unique_len = strlen(dev->unique); 264 } 265 266 return 0; 267 } 268 269 /** 270 * Get a mapping information. 271 * 272 * \param inode device inode. 273 * \param file_priv DRM file private. 274 * \param cmd command. 275 * \param arg user argument, pointing to a drm_map structure. 276 * 277 * \return zero on success or a negative number on failure. 278 * 279 * Searches for the mapping with the specified offset and copies its information 280 * into userspace 281 */ 282 int drm_getmap(struct drm_device *dev, void *data, 283 struct drm_file *file_priv) 284 { 285 struct drm_map *map = data; 286 struct drm_map_list *r_list = NULL; 287 struct list_head *list; 288 int idx; 289 int i; 290 291 idx = map->offset; 292 if (idx < 0) 293 return -EINVAL; 294 295 i = 0; 296 mutex_lock(&dev->struct_mutex); 297 list_for_each(list, &dev->maplist) { 298 if (i == idx) { 299 r_list = list_entry(list, struct drm_map_list, head); 300 break; 301 } 302 i++; 303 } 304 if (!r_list || !r_list->map) { 305 mutex_unlock(&dev->struct_mutex); 306 return -EINVAL; 307 } 308 309 map->offset = r_list->map->offset; 310 map->size = r_list->map->size; 311 map->type = r_list->map->type; 312 map->flags = r_list->map->flags; 313 map->handle = (void *)(unsigned long) r_list->user_token; 314 315 #ifdef CONFIG_X86 316 /* 317 * There appears to be exactly one user of the mtrr index: dritest. 318 * It's easy enough to keep it working on non-PAT systems. 319 */ 320 map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr); 321 #else 322 map->mtrr = -1; 323 #endif 324 325 mutex_unlock(&dev->struct_mutex); 326 327 return 0; 328 } 329 330 /** 331 * Get client information. 332 * 333 * \param inode device inode. 334 * \param file_priv DRM file private. 335 * \param cmd command. 336 * \param arg user argument, pointing to a drm_client structure. 337 * 338 * \return zero on success or a negative number on failure. 339 * 340 * Searches for the client with the specified index and copies its information 341 * into userspace 342 */ 343 int drm_getclient(struct drm_device *dev, void *data, 344 struct drm_file *file_priv) 345 { 346 struct drm_client *client = data; 347 348 /* 349 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 350 * not breaking completely. Userspace tools stop enumerating one they 351 * get -EINVAL, hence this is the return value we need to hand back for 352 * no clients tracked. 353 * 354 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 355 * attempt to figure out whether they're authenticated or not. Since 356 * that's the only thing they care about, give it to the directly 357 * instead of walking one giant list. 358 */ 359 if (client->idx == 0) { 360 client->auth = file_priv->authenticated; 361 client->pid = pid_vnr(file_priv->pid); 362 client->uid = from_kuid_munged(current_user_ns(), 363 file_priv->uid); 364 client->magic = 0; 365 client->iocs = 0; 366 367 return 0; 368 } else { 369 return -EINVAL; 370 } 371 } 372 373 /** 374 * Get statistics information. 375 * 376 * \param inode device inode. 377 * \param file_priv DRM file private. 378 * \param cmd command. 379 * \param arg user argument, pointing to a drm_stats structure. 380 * 381 * \return zero on success or a negative number on failure. 382 */ 383 int drm_getstats(struct drm_device *dev, void *data, 384 struct drm_file *file_priv) 385 { 386 struct drm_stats *stats = data; 387 388 /* Clear stats to prevent userspace from eating its stack garbage. */ 389 memset(stats, 0, sizeof(*stats)); 390 391 return 0; 392 } 393 394 /** 395 * Get device/driver capabilities 396 */ 397 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 398 { 399 struct drm_get_cap *req = data; 400 401 req->value = 0; 402 switch (req->capability) { 403 case DRM_CAP_DUMB_BUFFER: 404 if (dev->driver->dumb_create) 405 req->value = 1; 406 break; 407 case DRM_CAP_VBLANK_HIGH_CRTC: 408 req->value = 1; 409 break; 410 case DRM_CAP_DUMB_PREFERRED_DEPTH: 411 req->value = dev->mode_config.preferred_depth; 412 break; 413 case DRM_CAP_DUMB_PREFER_SHADOW: 414 req->value = dev->mode_config.prefer_shadow; 415 break; 416 case DRM_CAP_PRIME: 417 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 418 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 419 break; 420 case DRM_CAP_TIMESTAMP_MONOTONIC: 421 req->value = drm_timestamp_monotonic; 422 break; 423 case DRM_CAP_ASYNC_PAGE_FLIP: 424 req->value = dev->mode_config.async_page_flip; 425 break; 426 case DRM_CAP_CURSOR_WIDTH: 427 if (dev->mode_config.cursor_width) 428 req->value = dev->mode_config.cursor_width; 429 else 430 req->value = 64; 431 break; 432 case DRM_CAP_CURSOR_HEIGHT: 433 if (dev->mode_config.cursor_height) 434 req->value = dev->mode_config.cursor_height; 435 else 436 req->value = 64; 437 break; 438 default: 439 return -EINVAL; 440 } 441 return 0; 442 } 443 444 /** 445 * Set device/driver capabilities 446 */ 447 int 448 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 449 { 450 struct drm_set_client_cap *req = data; 451 452 switch (req->capability) { 453 case DRM_CLIENT_CAP_STEREO_3D: 454 if (req->value > 1) 455 return -EINVAL; 456 file_priv->stereo_allowed = req->value; 457 break; 458 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 459 if (req->value > 1) 460 return -EINVAL; 461 file_priv->universal_planes = req->value; 462 break; 463 default: 464 return -EINVAL; 465 } 466 467 return 0; 468 } 469 470 /** 471 * Setversion ioctl. 472 * 473 * \param inode device inode. 474 * \param file_priv DRM file private. 475 * \param cmd command. 476 * \param arg user argument, pointing to a drm_lock structure. 477 * \return zero on success or negative number on failure. 478 * 479 * Sets the requested interface version 480 */ 481 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 482 { 483 struct drm_set_version *sv = data; 484 int if_version, retcode = 0; 485 486 if (sv->drm_di_major != -1) { 487 if (sv->drm_di_major != DRM_IF_MAJOR || 488 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 489 retcode = -EINVAL; 490 goto done; 491 } 492 if_version = DRM_IF_VERSION(sv->drm_di_major, 493 sv->drm_di_minor); 494 dev->if_version = max(if_version, dev->if_version); 495 if (sv->drm_di_minor >= 1) { 496 /* 497 * Version 1.1 includes tying of DRM to specific device 498 * Version 1.4 has proper PCI domain support 499 */ 500 retcode = drm_set_busid(dev, file_priv); 501 if (retcode) 502 goto done; 503 } 504 } 505 506 if (sv->drm_dd_major != -1) { 507 if (sv->drm_dd_major != dev->driver->major || 508 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 509 dev->driver->minor) { 510 retcode = -EINVAL; 511 goto done; 512 } 513 } 514 515 done: 516 sv->drm_di_major = DRM_IF_MAJOR; 517 sv->drm_di_minor = DRM_IF_MINOR; 518 sv->drm_dd_major = dev->driver->major; 519 sv->drm_dd_minor = dev->driver->minor; 520 521 return retcode; 522 } 523 524 /** No-op ioctl. */ 525 int drm_noop(struct drm_device *dev, void *data, 526 struct drm_file *file_priv) 527 { 528 DRM_DEBUG("\n"); 529 return 0; 530 } 531 EXPORT_SYMBOL(drm_noop); 532 533 /** 534 * Copy and IOCTL return string to user space 535 */ 536 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 537 { 538 int len; 539 540 /* don't overflow userbuf */ 541 len = strlen(value); 542 if (len > *buf_len) 543 len = *buf_len; 544 545 /* let userspace know exact length of driver value (which could be 546 * larger than the userspace-supplied buffer) */ 547 *buf_len = strlen(value); 548 549 /* finally, try filling in the userbuf */ 550 if (len && buf) 551 if (copy_to_user(buf, value, len)) 552 return -EFAULT; 553 return 0; 554 } 555 556 /** 557 * Get version information 558 * 559 * \param inode device inode. 560 * \param filp file pointer. 561 * \param cmd command. 562 * \param arg user argument, pointing to a drm_version structure. 563 * \return zero on success or negative number on failure. 564 * 565 * Fills in the version information in \p arg. 566 */ 567 static int drm_version(struct drm_device *dev, void *data, 568 struct drm_file *file_priv) 569 { 570 struct drm_version *version = data; 571 int err; 572 573 version->version_major = dev->driver->major; 574 version->version_minor = dev->driver->minor; 575 version->version_patchlevel = dev->driver->patchlevel; 576 err = drm_copy_field(version->name, &version->name_len, 577 dev->driver->name); 578 if (!err) 579 err = drm_copy_field(version->date, &version->date_len, 580 dev->driver->date); 581 if (!err) 582 err = drm_copy_field(version->desc, &version->desc_len, 583 dev->driver->desc); 584 585 return err; 586 } 587 588 /** 589 * drm_ioctl_permit - Check ioctl permissions against caller 590 * 591 * @flags: ioctl permission flags. 592 * @file_priv: Pointer to struct drm_file identifying the caller. 593 * 594 * Checks whether the caller is allowed to run an ioctl with the 595 * indicated permissions. If so, returns zero. Otherwise returns an 596 * error code suitable for ioctl return. 597 */ 598 static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 599 { 600 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 601 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 602 return -EACCES; 603 604 /* AUTH is only for authenticated or render client */ 605 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 606 !file_priv->authenticated)) 607 return -EACCES; 608 609 /* MASTER is only for master or control clients */ 610 if (unlikely((flags & DRM_MASTER) && !file_priv->is_master && 611 !drm_is_control_client(file_priv))) 612 return -EACCES; 613 614 /* Control clients must be explicitly allowed */ 615 if (unlikely(!(flags & DRM_CONTROL_ALLOW) && 616 drm_is_control_client(file_priv))) 617 return -EACCES; 618 619 /* Render clients must be explicitly allowed */ 620 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 621 drm_is_render_client(file_priv))) 622 return -EACCES; 623 624 return 0; 625 } 626 627 /** 628 * Called whenever a process performs an ioctl on /dev/drm. 629 * 630 * \param inode device inode. 631 * \param file_priv DRM file private. 632 * \param cmd command. 633 * \param arg user argument. 634 * \return zero on success or negative number on failure. 635 * 636 * Looks up the ioctl function in the ::ioctls table, checking for root 637 * previleges if so required, and dispatches to the respective function. 638 */ 639 long drm_ioctl(struct file *filp, 640 unsigned int cmd, unsigned long arg) 641 { 642 struct drm_file *file_priv = filp->private_data; 643 struct drm_device *dev; 644 const struct drm_ioctl_desc *ioctl = NULL; 645 drm_ioctl_t *func; 646 unsigned int nr = DRM_IOCTL_NR(cmd); 647 int retcode = -EINVAL; 648 char stack_kdata[128]; 649 char *kdata = NULL; 650 unsigned int usize, asize; 651 652 dev = file_priv->minor->dev; 653 654 if (drm_device_is_unplugged(dev)) 655 return -ENODEV; 656 657 if ((nr >= DRM_CORE_IOCTL_COUNT) && 658 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 659 goto err_i1; 660 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 661 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) { 662 u32 drv_size; 663 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 664 drv_size = _IOC_SIZE(ioctl->cmd_drv); 665 usize = asize = _IOC_SIZE(cmd); 666 if (drv_size > asize) 667 asize = drv_size; 668 cmd = ioctl->cmd_drv; 669 } 670 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 671 u32 drv_size; 672 673 ioctl = &drm_ioctls[nr]; 674 675 drv_size = _IOC_SIZE(ioctl->cmd); 676 usize = asize = _IOC_SIZE(cmd); 677 if (drv_size > asize) 678 asize = drv_size; 679 680 cmd = ioctl->cmd; 681 } else 682 goto err_i1; 683 684 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 685 task_pid_nr(current), 686 (long)old_encode_dev(file_priv->minor->kdev->devt), 687 file_priv->authenticated, ioctl->name); 688 689 /* Do not trust userspace, use our own definition */ 690 func = ioctl->func; 691 692 if (unlikely(!func)) { 693 DRM_DEBUG("no function\n"); 694 retcode = -EINVAL; 695 goto err_i1; 696 } 697 698 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 699 if (unlikely(retcode)) 700 goto err_i1; 701 702 if (cmd & (IOC_IN | IOC_OUT)) { 703 if (asize <= sizeof(stack_kdata)) { 704 kdata = stack_kdata; 705 } else { 706 kdata = kmalloc(asize, GFP_KERNEL); 707 if (!kdata) { 708 retcode = -ENOMEM; 709 goto err_i1; 710 } 711 } 712 if (asize > usize) 713 memset(kdata + usize, 0, asize - usize); 714 } 715 716 if (cmd & IOC_IN) { 717 if (copy_from_user(kdata, (void __user *)arg, 718 usize) != 0) { 719 retcode = -EFAULT; 720 goto err_i1; 721 } 722 } else if (cmd & IOC_OUT) { 723 memset(kdata, 0, usize); 724 } 725 726 if (ioctl->flags & DRM_UNLOCKED) 727 retcode = func(dev, kdata, file_priv); 728 else { 729 mutex_lock(&drm_global_mutex); 730 retcode = func(dev, kdata, file_priv); 731 mutex_unlock(&drm_global_mutex); 732 } 733 734 if (cmd & IOC_OUT) { 735 if (copy_to_user((void __user *)arg, kdata, 736 usize) != 0) 737 retcode = -EFAULT; 738 } 739 740 err_i1: 741 if (!ioctl) 742 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 743 task_pid_nr(current), 744 (long)old_encode_dev(file_priv->minor->kdev->devt), 745 file_priv->authenticated, cmd, nr); 746 747 if (kdata != stack_kdata) 748 kfree(kdata); 749 if (retcode) 750 DRM_DEBUG("ret = %d\n", retcode); 751 return retcode; 752 } 753 EXPORT_SYMBOL(drm_ioctl); 754 755 /** 756 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 757 * 758 * @nr: Ioctl number. 759 * @flags: Where to return the ioctl permission flags 760 */ 761 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 762 { 763 if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) || 764 (nr < DRM_COMMAND_BASE)) { 765 *flags = drm_ioctls[nr].flags; 766 return true; 767 } 768 769 return false; 770 } 771 EXPORT_SYMBOL(drm_ioctl_flags); 772