1 /** 2 * \file drm_ioctl.c 3 * IOCTL processing for DRM 4 * 5 * \author Rickard E. (Rik) Faith <faith@valinux.com> 6 * \author Gareth Hughes <gareth@valinux.com> 7 */ 8 9 /* 10 * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com 11 * 12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 14 * All Rights Reserved. 15 * 16 * Permission is hereby granted, free of charge, to any person obtaining a 17 * copy of this software and associated documentation files (the "Software"), 18 * to deal in the Software without restriction, including without limitation 19 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 20 * and/or sell copies of the Software, and to permit persons to whom the 21 * Software is furnished to do so, subject to the following conditions: 22 * 23 * The above copyright notice and this permission notice (including the next 24 * paragraph) shall be included in all copies or substantial portions of the 25 * Software. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 33 * OTHER DEALINGS IN THE SOFTWARE. 34 */ 35 36 #include <drm/drmP.h> 37 #include <drm/drm_core.h> 38 39 #include <linux/pci.h> 40 #include <linux/export.h> 41 #ifdef CONFIG_X86 42 #include <asm/mtrr.h> 43 #endif 44 45 /** 46 * Get the bus id. 47 * 48 * \param inode device inode. 49 * \param file_priv DRM file private. 50 * \param cmd command. 51 * \param arg user argument, pointing to a drm_unique structure. 52 * \return zero on success or a negative number on failure. 53 * 54 * Copies the bus id from drm_device::unique into user space. 55 */ 56 int drm_getunique(struct drm_device *dev, void *data, 57 struct drm_file *file_priv) 58 { 59 struct drm_unique *u = data; 60 struct drm_master *master = file_priv->master; 61 62 if (u->unique_len >= master->unique_len) { 63 if (copy_to_user(u->unique, master->unique, master->unique_len)) 64 return -EFAULT; 65 } 66 u->unique_len = master->unique_len; 67 68 return 0; 69 } 70 71 static void 72 drm_unset_busid(struct drm_device *dev, 73 struct drm_master *master) 74 { 75 kfree(master->unique); 76 master->unique = NULL; 77 master->unique_len = 0; 78 master->unique_size = 0; 79 } 80 81 /** 82 * Set the bus id. 83 * 84 * \param inode device inode. 85 * \param file_priv DRM file private. 86 * \param cmd command. 87 * \param arg user argument, pointing to a drm_unique structure. 88 * \return zero on success or a negative number on failure. 89 * 90 * Copies the bus id from userspace into drm_device::unique, and verifies that 91 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated 92 * in interface version 1.1 and will return EBUSY when setversion has requested 93 * version 1.1 or greater. Also note that KMS is all version 1.1 and later and 94 * UMS was only ever supported on pci devices. 95 */ 96 int drm_setunique(struct drm_device *dev, void *data, 97 struct drm_file *file_priv) 98 { 99 struct drm_unique *u = data; 100 struct drm_master *master = file_priv->master; 101 int ret; 102 103 if (master->unique_len || master->unique) 104 return -EBUSY; 105 106 if (!u->unique_len || u->unique_len > 1024) 107 return -EINVAL; 108 109 if (drm_core_check_feature(dev, DRIVER_MODESET)) 110 return 0; 111 112 if (WARN_ON(!dev->pdev)) 113 return -EINVAL; 114 115 ret = drm_pci_set_unique(dev, master, u); 116 if (ret) 117 goto err; 118 119 return 0; 120 121 err: 122 drm_unset_busid(dev, master); 123 return ret; 124 } 125 126 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 127 { 128 struct drm_master *master = file_priv->master; 129 int ret; 130 131 if (master->unique != NULL) 132 drm_unset_busid(dev, master); 133 134 if (dev->driver->bus && dev->driver->bus->set_busid) { 135 ret = dev->driver->bus->set_busid(dev, master); 136 if (ret) { 137 drm_unset_busid(dev, master); 138 return ret; 139 } 140 } else { 141 if (WARN(dev->unique == NULL, 142 "No drm_bus.set_busid() implementation provided by " 143 "%ps. Use drm_dev_set_unique() to set the unique " 144 "name explicitly.", dev->driver)) 145 return -EINVAL; 146 147 master->unique = kstrdup(dev->unique, GFP_KERNEL); 148 if (master->unique) 149 master->unique_len = strlen(dev->unique); 150 } 151 152 return 0; 153 } 154 155 /** 156 * Get a mapping information. 157 * 158 * \param inode device inode. 159 * \param file_priv DRM file private. 160 * \param cmd command. 161 * \param arg user argument, pointing to a drm_map structure. 162 * 163 * \return zero on success or a negative number on failure. 164 * 165 * Searches for the mapping with the specified offset and copies its information 166 * into userspace 167 */ 168 int drm_getmap(struct drm_device *dev, void *data, 169 struct drm_file *file_priv) 170 { 171 struct drm_map *map = data; 172 struct drm_map_list *r_list = NULL; 173 struct list_head *list; 174 int idx; 175 int i; 176 177 idx = map->offset; 178 if (idx < 0) 179 return -EINVAL; 180 181 i = 0; 182 mutex_lock(&dev->struct_mutex); 183 list_for_each(list, &dev->maplist) { 184 if (i == idx) { 185 r_list = list_entry(list, struct drm_map_list, head); 186 break; 187 } 188 i++; 189 } 190 if (!r_list || !r_list->map) { 191 mutex_unlock(&dev->struct_mutex); 192 return -EINVAL; 193 } 194 195 map->offset = r_list->map->offset; 196 map->size = r_list->map->size; 197 map->type = r_list->map->type; 198 map->flags = r_list->map->flags; 199 map->handle = (void *)(unsigned long) r_list->user_token; 200 201 #ifdef CONFIG_X86 202 /* 203 * There appears to be exactly one user of the mtrr index: dritest. 204 * It's easy enough to keep it working on non-PAT systems. 205 */ 206 map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr); 207 #else 208 map->mtrr = -1; 209 #endif 210 211 mutex_unlock(&dev->struct_mutex); 212 213 return 0; 214 } 215 216 /** 217 * Get client information. 218 * 219 * \param inode device inode. 220 * \param file_priv DRM file private. 221 * \param cmd command. 222 * \param arg user argument, pointing to a drm_client structure. 223 * 224 * \return zero on success or a negative number on failure. 225 * 226 * Searches for the client with the specified index and copies its information 227 * into userspace 228 */ 229 int drm_getclient(struct drm_device *dev, void *data, 230 struct drm_file *file_priv) 231 { 232 struct drm_client *client = data; 233 234 /* 235 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 236 * not breaking completely. Userspace tools stop enumerating one they 237 * get -EINVAL, hence this is the return value we need to hand back for 238 * no clients tracked. 239 * 240 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 241 * attempt to figure out whether they're authenticated or not. Since 242 * that's the only thing they care about, give it to the directly 243 * instead of walking one giant list. 244 */ 245 if (client->idx == 0) { 246 client->auth = file_priv->authenticated; 247 client->pid = pid_vnr(file_priv->pid); 248 client->uid = from_kuid_munged(current_user_ns(), 249 file_priv->uid); 250 client->magic = 0; 251 client->iocs = 0; 252 253 return 0; 254 } else { 255 return -EINVAL; 256 } 257 } 258 259 /** 260 * Get statistics information. 261 * 262 * \param inode device inode. 263 * \param file_priv DRM file private. 264 * \param cmd command. 265 * \param arg user argument, pointing to a drm_stats structure. 266 * 267 * \return zero on success or a negative number on failure. 268 */ 269 int drm_getstats(struct drm_device *dev, void *data, 270 struct drm_file *file_priv) 271 { 272 struct drm_stats *stats = data; 273 274 /* Clear stats to prevent userspace from eating its stack garbage. */ 275 memset(stats, 0, sizeof(*stats)); 276 277 return 0; 278 } 279 280 /** 281 * Get device/driver capabilities 282 */ 283 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 284 { 285 struct drm_get_cap *req = data; 286 287 req->value = 0; 288 switch (req->capability) { 289 case DRM_CAP_DUMB_BUFFER: 290 if (dev->driver->dumb_create) 291 req->value = 1; 292 break; 293 case DRM_CAP_VBLANK_HIGH_CRTC: 294 req->value = 1; 295 break; 296 case DRM_CAP_DUMB_PREFERRED_DEPTH: 297 req->value = dev->mode_config.preferred_depth; 298 break; 299 case DRM_CAP_DUMB_PREFER_SHADOW: 300 req->value = dev->mode_config.prefer_shadow; 301 break; 302 case DRM_CAP_PRIME: 303 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 304 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 305 break; 306 case DRM_CAP_TIMESTAMP_MONOTONIC: 307 req->value = drm_timestamp_monotonic; 308 break; 309 case DRM_CAP_ASYNC_PAGE_FLIP: 310 req->value = dev->mode_config.async_page_flip; 311 break; 312 case DRM_CAP_CURSOR_WIDTH: 313 if (dev->mode_config.cursor_width) 314 req->value = dev->mode_config.cursor_width; 315 else 316 req->value = 64; 317 break; 318 case DRM_CAP_CURSOR_HEIGHT: 319 if (dev->mode_config.cursor_height) 320 req->value = dev->mode_config.cursor_height; 321 else 322 req->value = 64; 323 break; 324 default: 325 return -EINVAL; 326 } 327 return 0; 328 } 329 330 /** 331 * Set device/driver capabilities 332 */ 333 int 334 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 335 { 336 struct drm_set_client_cap *req = data; 337 338 switch (req->capability) { 339 case DRM_CLIENT_CAP_STEREO_3D: 340 if (req->value > 1) 341 return -EINVAL; 342 file_priv->stereo_allowed = req->value; 343 break; 344 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 345 if (!drm_universal_planes) 346 return -EINVAL; 347 if (req->value > 1) 348 return -EINVAL; 349 file_priv->universal_planes = req->value; 350 break; 351 default: 352 return -EINVAL; 353 } 354 355 return 0; 356 } 357 358 /** 359 * Setversion ioctl. 360 * 361 * \param inode device inode. 362 * \param file_priv DRM file private. 363 * \param cmd command. 364 * \param arg user argument, pointing to a drm_lock structure. 365 * \return zero on success or negative number on failure. 366 * 367 * Sets the requested interface version 368 */ 369 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 370 { 371 struct drm_set_version *sv = data; 372 int if_version, retcode = 0; 373 374 if (sv->drm_di_major != -1) { 375 if (sv->drm_di_major != DRM_IF_MAJOR || 376 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 377 retcode = -EINVAL; 378 goto done; 379 } 380 if_version = DRM_IF_VERSION(sv->drm_di_major, 381 sv->drm_di_minor); 382 dev->if_version = max(if_version, dev->if_version); 383 if (sv->drm_di_minor >= 1) { 384 /* 385 * Version 1.1 includes tying of DRM to specific device 386 * Version 1.4 has proper PCI domain support 387 */ 388 retcode = drm_set_busid(dev, file_priv); 389 if (retcode) 390 goto done; 391 } 392 } 393 394 if (sv->drm_dd_major != -1) { 395 if (sv->drm_dd_major != dev->driver->major || 396 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 397 dev->driver->minor) { 398 retcode = -EINVAL; 399 goto done; 400 } 401 } 402 403 done: 404 sv->drm_di_major = DRM_IF_MAJOR; 405 sv->drm_di_minor = DRM_IF_MINOR; 406 sv->drm_dd_major = dev->driver->major; 407 sv->drm_dd_minor = dev->driver->minor; 408 409 return retcode; 410 } 411 412 /** No-op ioctl. */ 413 int drm_noop(struct drm_device *dev, void *data, 414 struct drm_file *file_priv) 415 { 416 DRM_DEBUG("\n"); 417 return 0; 418 } 419 EXPORT_SYMBOL(drm_noop); 420