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 /** 68 * Set the bus id. 69 * 70 * \param inode device inode. 71 * \param file_priv DRM file private. 72 * \param cmd command. 73 * \param arg user argument, pointing to a drm_unique structure. 74 * \return zero on success or a negative number on failure. 75 * 76 * Copies the bus id from userspace into drm_device::unique, and verifies that 77 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated 78 * in interface version 1.1 and will return EBUSY when setversion has requested 79 * version 1.1 or greater. 80 */ 81 int drm_setunique(struct drm_device *dev, void *data, 82 struct drm_file *file_priv) 83 { 84 struct drm_unique *u = data; 85 struct drm_master *master = file_priv->master; 86 int domain, bus, slot, func, ret; 87 88 if (master->unique_len || master->unique) 89 return -EBUSY; 90 91 if (!u->unique_len || u->unique_len > 1024) 92 return -EINVAL; 93 94 master->unique_len = u->unique_len; 95 master->unique_size = u->unique_len + 1; 96 master->unique = kmalloc(master->unique_size, GFP_KERNEL); 97 if (!master->unique) 98 return -ENOMEM; 99 if (copy_from_user(master->unique, u->unique, master->unique_len)) 100 return -EFAULT; 101 102 master->unique[master->unique_len] = '\0'; 103 104 dev->devname = kmalloc(strlen(dev->driver->pci_driver.name) + 105 strlen(master->unique) + 2, GFP_KERNEL); 106 if (!dev->devname) 107 return -ENOMEM; 108 109 sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name, 110 master->unique); 111 112 /* Return error if the busid submitted doesn't match the device's actual 113 * busid. 114 */ 115 ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func); 116 if (ret != 3) 117 return -EINVAL; 118 domain = bus >> 8; 119 bus &= 0xff; 120 121 if ((domain != drm_get_pci_domain(dev)) || 122 (bus != dev->pdev->bus->number) || 123 (slot != PCI_SLOT(dev->pdev->devfn)) || 124 (func != PCI_FUNC(dev->pdev->devfn))) 125 return -EINVAL; 126 127 return 0; 128 } 129 130 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 131 { 132 struct drm_master *master = file_priv->master; 133 int len; 134 135 if (master->unique != NULL) 136 return -EBUSY; 137 138 master->unique_len = 40; 139 master->unique_size = master->unique_len; 140 master->unique = kmalloc(master->unique_size, GFP_KERNEL); 141 if (master->unique == NULL) 142 return -ENOMEM; 143 144 len = snprintf(master->unique, master->unique_len, "pci:%04x:%02x:%02x.%d", 145 drm_get_pci_domain(dev), 146 dev->pdev->bus->number, 147 PCI_SLOT(dev->pdev->devfn), 148 PCI_FUNC(dev->pdev->devfn)); 149 if (len >= master->unique_len) 150 DRM_ERROR("buffer overflow"); 151 else 152 master->unique_len = len; 153 154 dev->devname = kmalloc(strlen(dev->driver->pci_driver.name) + 155 master->unique_len + 2, GFP_KERNEL); 156 if (dev->devname == NULL) 157 return -ENOMEM; 158 159 sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name, 160 master->unique); 161 162 return 0; 163 } 164 165 /** 166 * Get a mapping information. 167 * 168 * \param inode device inode. 169 * \param file_priv DRM file private. 170 * \param cmd command. 171 * \param arg user argument, pointing to a drm_map structure. 172 * 173 * \return zero on success or a negative number on failure. 174 * 175 * Searches for the mapping with the specified offset and copies its information 176 * into userspace 177 */ 178 int drm_getmap(struct drm_device *dev, void *data, 179 struct drm_file *file_priv) 180 { 181 struct drm_map *map = data; 182 struct drm_map_list *r_list = NULL; 183 struct list_head *list; 184 int idx; 185 int i; 186 187 idx = map->offset; 188 189 mutex_lock(&dev->struct_mutex); 190 if (idx < 0) { 191 mutex_unlock(&dev->struct_mutex); 192 return -EINVAL; 193 } 194 195 i = 0; 196 list_for_each(list, &dev->maplist) { 197 if (i == idx) { 198 r_list = list_entry(list, struct drm_map_list, head); 199 break; 200 } 201 i++; 202 } 203 if (!r_list || !r_list->map) { 204 mutex_unlock(&dev->struct_mutex); 205 return -EINVAL; 206 } 207 208 map->offset = r_list->map->offset; 209 map->size = r_list->map->size; 210 map->type = r_list->map->type; 211 map->flags = r_list->map->flags; 212 map->handle = (void *)(unsigned long) r_list->user_token; 213 map->mtrr = r_list->map->mtrr; 214 mutex_unlock(&dev->struct_mutex); 215 216 return 0; 217 } 218 219 /** 220 * Get client information. 221 * 222 * \param inode device inode. 223 * \param file_priv DRM file private. 224 * \param cmd command. 225 * \param arg user argument, pointing to a drm_client structure. 226 * 227 * \return zero on success or a negative number on failure. 228 * 229 * Searches for the client with the specified index and copies its information 230 * into userspace 231 */ 232 int drm_getclient(struct drm_device *dev, void *data, 233 struct drm_file *file_priv) 234 { 235 struct drm_client *client = data; 236 struct drm_file *pt; 237 int idx; 238 int i; 239 240 idx = client->idx; 241 mutex_lock(&dev->struct_mutex); 242 243 i = 0; 244 list_for_each_entry(pt, &dev->filelist, lhead) { 245 if (i++ >= idx) { 246 client->auth = pt->authenticated; 247 client->pid = pt->pid; 248 client->uid = pt->uid; 249 client->magic = pt->magic; 250 client->iocs = pt->ioctl_count; 251 mutex_unlock(&dev->struct_mutex); 252 253 return 0; 254 } 255 } 256 mutex_unlock(&dev->struct_mutex); 257 258 return -EINVAL; 259 } 260 261 /** 262 * Get statistics information. 263 * 264 * \param inode device inode. 265 * \param file_priv DRM file private. 266 * \param cmd command. 267 * \param arg user argument, pointing to a drm_stats structure. 268 * 269 * \return zero on success or a negative number on failure. 270 */ 271 int drm_getstats(struct drm_device *dev, void *data, 272 struct drm_file *file_priv) 273 { 274 struct drm_stats *stats = data; 275 int i; 276 277 memset(stats, 0, sizeof(*stats)); 278 279 mutex_lock(&dev->struct_mutex); 280 281 for (i = 0; i < dev->counters; i++) { 282 if (dev->types[i] == _DRM_STAT_LOCK) 283 stats->data[i].value = 284 (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0); 285 else 286 stats->data[i].value = atomic_read(&dev->counts[i]); 287 stats->data[i].type = dev->types[i]; 288 } 289 290 stats->count = dev->counters; 291 292 mutex_unlock(&dev->struct_mutex); 293 294 return 0; 295 } 296 297 /** 298 * Setversion ioctl. 299 * 300 * \param inode device inode. 301 * \param file_priv DRM file private. 302 * \param cmd command. 303 * \param arg user argument, pointing to a drm_lock structure. 304 * \return zero on success or negative number on failure. 305 * 306 * Sets the requested interface version 307 */ 308 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 309 { 310 struct drm_set_version *sv = data; 311 int if_version, retcode = 0; 312 313 if (sv->drm_di_major != -1) { 314 if (sv->drm_di_major != DRM_IF_MAJOR || 315 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 316 retcode = -EINVAL; 317 goto done; 318 } 319 if_version = DRM_IF_VERSION(sv->drm_di_major, 320 sv->drm_di_minor); 321 dev->if_version = max(if_version, dev->if_version); 322 if (sv->drm_di_minor >= 1) { 323 /* 324 * Version 1.1 includes tying of DRM to specific device 325 */ 326 drm_set_busid(dev, file_priv); 327 } 328 } 329 330 if (sv->drm_dd_major != -1) { 331 if (sv->drm_dd_major != dev->driver->major || 332 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 333 dev->driver->minor) { 334 retcode = -EINVAL; 335 goto done; 336 } 337 338 if (dev->driver->set_version) 339 dev->driver->set_version(dev, sv); 340 } 341 342 done: 343 sv->drm_di_major = DRM_IF_MAJOR; 344 sv->drm_di_minor = DRM_IF_MINOR; 345 sv->drm_dd_major = dev->driver->major; 346 sv->drm_dd_minor = dev->driver->minor; 347 348 return retcode; 349 } 350 351 /** No-op ioctl. */ 352 int drm_noop(struct drm_device *dev, void *data, 353 struct drm_file *file_priv) 354 { 355 DRM_DEBUG("\n"); 356 return 0; 357 } 358