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 "drmP.h" 37 #include "drm_core.h" 38 39 #include "linux/pci.h" 40 41 /** 42 * Get the bus id. 43 * 44 * \param inode device inode. 45 * \param file_priv DRM file private. 46 * \param cmd command. 47 * \param arg user argument, pointing to a drm_unique structure. 48 * \return zero on success or a negative number on failure. 49 * 50 * Copies the bus id from drm_device::unique into user space. 51 */ 52 int drm_getunique(struct drm_device *dev, void *data, 53 struct drm_file *file_priv) 54 { 55 struct drm_unique *u = data; 56 struct drm_master *master = file_priv->master; 57 58 if (u->unique_len >= master->unique_len) { 59 if (copy_to_user(u->unique, master->unique, master->unique_len)) 60 return -EFAULT; 61 } 62 u->unique_len = master->unique_len; 63 64 return 0; 65 } 66 67 static void 68 drm_unset_busid(struct drm_device *dev, 69 struct drm_master *master) 70 { 71 kfree(dev->devname); 72 dev->devname = NULL; 73 74 kfree(master->unique); 75 master->unique = NULL; 76 master->unique_len = 0; 77 master->unique_size = 0; 78 } 79 80 /** 81 * Set the bus id. 82 * 83 * \param inode device inode. 84 * \param file_priv DRM file private. 85 * \param cmd command. 86 * \param arg user argument, pointing to a drm_unique structure. 87 * \return zero on success or a negative number on failure. 88 * 89 * Copies the bus id from userspace into drm_device::unique, and verifies that 90 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated 91 * in interface version 1.1 and will return EBUSY when setversion has requested 92 * version 1.1 or greater. 93 */ 94 int drm_setunique(struct drm_device *dev, void *data, 95 struct drm_file *file_priv) 96 { 97 struct drm_unique *u = data; 98 struct drm_master *master = file_priv->master; 99 int ret; 100 101 if (master->unique_len || master->unique) 102 return -EBUSY; 103 104 if (!u->unique_len || u->unique_len > 1024) 105 return -EINVAL; 106 107 if (!dev->driver->bus->set_unique) 108 return -EINVAL; 109 110 ret = dev->driver->bus->set_unique(dev, master, u); 111 if (ret) 112 goto err; 113 114 return 0; 115 116 err: 117 drm_unset_busid(dev, master); 118 return ret; 119 } 120 121 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 122 { 123 struct drm_master *master = file_priv->master; 124 int ret; 125 126 if (master->unique != NULL) 127 drm_unset_busid(dev, master); 128 129 ret = dev->driver->bus->set_busid(dev, master); 130 if (ret) 131 goto err; 132 return 0; 133 err: 134 drm_unset_busid(dev, master); 135 return ret; 136 } 137 138 /** 139 * Get a mapping information. 140 * 141 * \param inode device inode. 142 * \param file_priv DRM file private. 143 * \param cmd command. 144 * \param arg user argument, pointing to a drm_map structure. 145 * 146 * \return zero on success or a negative number on failure. 147 * 148 * Searches for the mapping with the specified offset and copies its information 149 * into userspace 150 */ 151 int drm_getmap(struct drm_device *dev, void *data, 152 struct drm_file *file_priv) 153 { 154 struct drm_map *map = data; 155 struct drm_map_list *r_list = NULL; 156 struct list_head *list; 157 int idx; 158 int i; 159 160 idx = map->offset; 161 162 mutex_lock(&dev->struct_mutex); 163 if (idx < 0) { 164 mutex_unlock(&dev->struct_mutex); 165 return -EINVAL; 166 } 167 168 i = 0; 169 list_for_each(list, &dev->maplist) { 170 if (i == idx) { 171 r_list = list_entry(list, struct drm_map_list, head); 172 break; 173 } 174 i++; 175 } 176 if (!r_list || !r_list->map) { 177 mutex_unlock(&dev->struct_mutex); 178 return -EINVAL; 179 } 180 181 map->offset = r_list->map->offset; 182 map->size = r_list->map->size; 183 map->type = r_list->map->type; 184 map->flags = r_list->map->flags; 185 map->handle = (void *)(unsigned long) r_list->user_token; 186 map->mtrr = r_list->map->mtrr; 187 mutex_unlock(&dev->struct_mutex); 188 189 return 0; 190 } 191 192 /** 193 * Get client information. 194 * 195 * \param inode device inode. 196 * \param file_priv DRM file private. 197 * \param cmd command. 198 * \param arg user argument, pointing to a drm_client structure. 199 * 200 * \return zero on success or a negative number on failure. 201 * 202 * Searches for the client with the specified index and copies its information 203 * into userspace 204 */ 205 int drm_getclient(struct drm_device *dev, void *data, 206 struct drm_file *file_priv) 207 { 208 struct drm_client *client = data; 209 struct drm_file *pt; 210 int idx; 211 int i; 212 213 idx = client->idx; 214 mutex_lock(&dev->struct_mutex); 215 216 i = 0; 217 list_for_each_entry(pt, &dev->filelist, lhead) { 218 if (i++ >= idx) { 219 client->auth = pt->authenticated; 220 client->pid = pt->pid; 221 client->uid = pt->uid; 222 client->magic = pt->magic; 223 client->iocs = pt->ioctl_count; 224 mutex_unlock(&dev->struct_mutex); 225 226 return 0; 227 } 228 } 229 mutex_unlock(&dev->struct_mutex); 230 231 return -EINVAL; 232 } 233 234 /** 235 * Get statistics information. 236 * 237 * \param inode device inode. 238 * \param file_priv DRM file private. 239 * \param cmd command. 240 * \param arg user argument, pointing to a drm_stats structure. 241 * 242 * \return zero on success or a negative number on failure. 243 */ 244 int drm_getstats(struct drm_device *dev, void *data, 245 struct drm_file *file_priv) 246 { 247 struct drm_stats *stats = data; 248 int i; 249 250 memset(stats, 0, sizeof(*stats)); 251 252 mutex_lock(&dev->struct_mutex); 253 254 for (i = 0; i < dev->counters; i++) { 255 if (dev->types[i] == _DRM_STAT_LOCK) 256 stats->data[i].value = 257 (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0); 258 else 259 stats->data[i].value = atomic_read(&dev->counts[i]); 260 stats->data[i].type = dev->types[i]; 261 } 262 263 stats->count = dev->counters; 264 265 mutex_unlock(&dev->struct_mutex); 266 267 return 0; 268 } 269 270 /** 271 * Get device/driver capabilities 272 */ 273 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 274 { 275 struct drm_get_cap *req = data; 276 277 req->value = 0; 278 switch (req->capability) { 279 case DRM_CAP_DUMB_BUFFER: 280 if (dev->driver->dumb_create) 281 req->value = 1; 282 break; 283 default: 284 return -EINVAL; 285 } 286 return 0; 287 } 288 289 /** 290 * Setversion ioctl. 291 * 292 * \param inode device inode. 293 * \param file_priv DRM file private. 294 * \param cmd command. 295 * \param arg user argument, pointing to a drm_lock structure. 296 * \return zero on success or negative number on failure. 297 * 298 * Sets the requested interface version 299 */ 300 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 301 { 302 struct drm_set_version *sv = data; 303 int if_version, retcode = 0; 304 305 if (sv->drm_di_major != -1) { 306 if (sv->drm_di_major != DRM_IF_MAJOR || 307 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 308 retcode = -EINVAL; 309 goto done; 310 } 311 if_version = DRM_IF_VERSION(sv->drm_di_major, 312 sv->drm_di_minor); 313 dev->if_version = max(if_version, dev->if_version); 314 if (sv->drm_di_minor >= 1) { 315 /* 316 * Version 1.1 includes tying of DRM to specific device 317 * Version 1.4 has proper PCI domain support 318 */ 319 retcode = drm_set_busid(dev, file_priv); 320 if (retcode) 321 goto done; 322 } 323 } 324 325 if (sv->drm_dd_major != -1) { 326 if (sv->drm_dd_major != dev->driver->major || 327 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 328 dev->driver->minor) { 329 retcode = -EINVAL; 330 goto done; 331 } 332 333 if (dev->driver->set_version) 334 dev->driver->set_version(dev, sv); 335 } 336 337 done: 338 sv->drm_di_major = DRM_IF_MAJOR; 339 sv->drm_di_minor = DRM_IF_MINOR; 340 sv->drm_dd_major = dev->driver->major; 341 sv->drm_dd_minor = dev->driver->minor; 342 343 return retcode; 344 } 345 346 /** No-op ioctl. */ 347 int drm_noop(struct drm_device *dev, void *data, 348 struct drm_file *file_priv) 349 { 350 DRM_DEBUG("\n"); 351 return 0; 352 } 353