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 57 if (u->unique_len >= dev->unique_len) { 58 if (copy_to_user(u->unique, dev->unique, dev->unique_len)) 59 return -EFAULT; 60 } 61 u->unique_len = dev->unique_len; 62 63 return 0; 64 } 65 66 /** 67 * Set the bus id. 68 * 69 * \param inode device inode. 70 * \param file_priv DRM file private. 71 * \param cmd command. 72 * \param arg user argument, pointing to a drm_unique structure. 73 * \return zero on success or a negative number on failure. 74 * 75 * Copies the bus id from userspace into drm_device::unique, and verifies that 76 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated 77 * in interface version 1.1 and will return EBUSY when setversion has requested 78 * version 1.1 or greater. 79 */ 80 int drm_setunique(struct drm_device *dev, void *data, 81 struct drm_file *file_priv) 82 { 83 struct drm_unique *u = data; 84 int domain, bus, slot, func, ret; 85 86 if (dev->unique_len || dev->unique) 87 return -EBUSY; 88 89 if (!u->unique_len || u->unique_len > 1024) 90 return -EINVAL; 91 92 dev->unique_len = u->unique_len; 93 dev->unique = drm_alloc(u->unique_len + 1, DRM_MEM_DRIVER); 94 if (!dev->unique) 95 return -ENOMEM; 96 if (copy_from_user(dev->unique, u->unique, dev->unique_len)) 97 return -EFAULT; 98 99 dev->unique[dev->unique_len] = '\0'; 100 101 dev->devname = 102 drm_alloc(strlen(dev->driver->pci_driver.name) + 103 strlen(dev->unique) + 2, DRM_MEM_DRIVER); 104 if (!dev->devname) 105 return -ENOMEM; 106 107 sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name, 108 dev->unique); 109 110 /* Return error if the busid submitted doesn't match the device's actual 111 * busid. 112 */ 113 ret = sscanf(dev->unique, "PCI:%d:%d:%d", &bus, &slot, &func); 114 if (ret != 3) 115 return -EINVAL; 116 domain = bus >> 8; 117 bus &= 0xff; 118 119 if ((domain != drm_get_pci_domain(dev)) || 120 (bus != dev->pdev->bus->number) || 121 (slot != PCI_SLOT(dev->pdev->devfn)) || 122 (func != PCI_FUNC(dev->pdev->devfn))) 123 return -EINVAL; 124 125 return 0; 126 } 127 128 static int drm_set_busid(struct drm_device * dev) 129 { 130 int len; 131 132 if (dev->unique != NULL) 133 return 0; 134 135 dev->unique_len = 40; 136 dev->unique = drm_alloc(dev->unique_len + 1, DRM_MEM_DRIVER); 137 if (dev->unique == NULL) 138 return -ENOMEM; 139 140 len = snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d", 141 drm_get_pci_domain(dev), dev->pdev->bus->number, 142 PCI_SLOT(dev->pdev->devfn), 143 PCI_FUNC(dev->pdev->devfn)); 144 145 if (len > dev->unique_len) 146 DRM_ERROR("Unique buffer overflowed\n"); 147 148 dev->devname = 149 drm_alloc(strlen(dev->driver->pci_driver.name) + dev->unique_len + 150 2, DRM_MEM_DRIVER); 151 if (dev->devname == NULL) 152 return -ENOMEM; 153 154 sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name, 155 dev->unique); 156 157 return 0; 158 } 159 160 /** 161 * Get a mapping information. 162 * 163 * \param inode device inode. 164 * \param file_priv DRM file private. 165 * \param cmd command. 166 * \param arg user argument, pointing to a drm_map structure. 167 * 168 * \return zero on success or a negative number on failure. 169 * 170 * Searches for the mapping with the specified offset and copies its information 171 * into userspace 172 */ 173 int drm_getmap(struct drm_device *dev, void *data, 174 struct drm_file *file_priv) 175 { 176 struct drm_map *map = data; 177 struct drm_map_list *r_list = NULL; 178 struct list_head *list; 179 int idx; 180 int i; 181 182 idx = map->offset; 183 184 mutex_lock(&dev->struct_mutex); 185 if (idx < 0) { 186 mutex_unlock(&dev->struct_mutex); 187 return -EINVAL; 188 } 189 190 i = 0; 191 list_for_each(list, &dev->maplist) { 192 if (i == idx) { 193 r_list = list_entry(list, struct drm_map_list, head); 194 break; 195 } 196 i++; 197 } 198 if (!r_list || !r_list->map) { 199 mutex_unlock(&dev->struct_mutex); 200 return -EINVAL; 201 } 202 203 map->offset = r_list->map->offset; 204 map->size = r_list->map->size; 205 map->type = r_list->map->type; 206 map->flags = r_list->map->flags; 207 map->handle = (void *)(unsigned long) r_list->user_token; 208 map->mtrr = r_list->map->mtrr; 209 mutex_unlock(&dev->struct_mutex); 210 211 return 0; 212 } 213 214 /** 215 * Get client information. 216 * 217 * \param inode device inode. 218 * \param file_priv DRM file private. 219 * \param cmd command. 220 * \param arg user argument, pointing to a drm_client structure. 221 * 222 * \return zero on success or a negative number on failure. 223 * 224 * Searches for the client with the specified index and copies its information 225 * into userspace 226 */ 227 int drm_getclient(struct drm_device *dev, void *data, 228 struct drm_file *file_priv) 229 { 230 struct drm_client *client = data; 231 struct drm_file *pt; 232 int idx; 233 int i; 234 235 idx = client->idx; 236 mutex_lock(&dev->struct_mutex); 237 238 i = 0; 239 list_for_each_entry(pt, &dev->filelist, lhead) { 240 if (i++ >= idx) { 241 client->auth = pt->authenticated; 242 client->pid = pt->pid; 243 client->uid = pt->uid; 244 client->magic = pt->magic; 245 client->iocs = pt->ioctl_count; 246 mutex_unlock(&dev->struct_mutex); 247 248 return 0; 249 } 250 } 251 mutex_unlock(&dev->struct_mutex); 252 253 return -EINVAL; 254 } 255 256 /** 257 * Get statistics information. 258 * 259 * \param inode device inode. 260 * \param file_priv DRM file private. 261 * \param cmd command. 262 * \param arg user argument, pointing to a drm_stats structure. 263 * 264 * \return zero on success or a negative number on failure. 265 */ 266 int drm_getstats(struct drm_device *dev, void *data, 267 struct drm_file *file_priv) 268 { 269 struct drm_stats *stats = data; 270 int i; 271 272 memset(stats, 0, sizeof(*stats)); 273 274 mutex_lock(&dev->struct_mutex); 275 276 for (i = 0; i < dev->counters; i++) { 277 if (dev->types[i] == _DRM_STAT_LOCK) 278 stats->data[i].value = 279 (dev->lock.hw_lock ? dev->lock.hw_lock->lock : 0); 280 else 281 stats->data[i].value = atomic_read(&dev->counts[i]); 282 stats->data[i].type = dev->types[i]; 283 } 284 285 stats->count = dev->counters; 286 287 mutex_unlock(&dev->struct_mutex); 288 289 return 0; 290 } 291 292 /** 293 * Setversion ioctl. 294 * 295 * \param inode device inode. 296 * \param file_priv DRM file private. 297 * \param cmd command. 298 * \param arg user argument, pointing to a drm_lock structure. 299 * \return zero on success or negative number on failure. 300 * 301 * Sets the requested interface version 302 */ 303 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 304 { 305 struct drm_set_version *sv = data; 306 int if_version, retcode = 0; 307 308 if (sv->drm_di_major != -1) { 309 if (sv->drm_di_major != DRM_IF_MAJOR || 310 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 311 retcode = -EINVAL; 312 goto done; 313 } 314 if_version = DRM_IF_VERSION(sv->drm_di_major, 315 sv->drm_di_minor); 316 dev->if_version = max(if_version, dev->if_version); 317 if (sv->drm_di_minor >= 1) { 318 /* 319 * Version 1.1 includes tying of DRM to specific device 320 */ 321 drm_set_busid(dev); 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