drivers/gpu/drm/drm_ioctl.c

   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 domain, bus, slot, func, 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         master->unique_len = u->unique_len;
 108         master->unique_size = u->unique_len + 1;
 109         master->unique = kmalloc(master->unique_size, GFP_KERNEL);
 110         if (!master->unique) {
 111                 ret = -ENOMEM;
 112                 goto err;
 113         }
 114
 115         if (copy_from_user(master->unique, u->unique, master->unique_len)) {
 116                 ret = -EFAULT;
 117                 goto err;
 118         }
 119
 120         master->unique[master->unique_len] = '\0';
 121
 122         dev->devname = kmalloc(strlen(dev->driver->pci_driver.name) +
 123                                strlen(master->unique) + 2, GFP_KERNEL);
 124         if (!dev->devname) {
 125                 ret = -ENOMEM;
 126                 goto err;
 127         }
 128
 129         sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
 130                 master->unique);
 131
 132         /* Return error if the busid submitted doesn't match the device's actual
 133          * busid.
 134          */
 135         ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
 136         if (ret != 3) {
 137                 ret = -EINVAL;
 138                 goto err;
 139         }
 140
 141         domain = bus >> 8;
 142         bus &= 0xff;
 143
 144         if ((domain != drm_get_pci_domain(dev)) ||
 145             (bus != dev->pdev->bus->number) ||
 146             (slot != PCI_SLOT(dev->pdev->devfn)) ||
 147             (func != PCI_FUNC(dev->pdev->devfn))) {
 148                 ret = -EINVAL;
 149                 goto err;
 150         }
 151
 152         return 0;
 153
 154 err:
 155         drm_unset_busid(dev, master);
 156         return ret;
 157 }
 158
 159 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 160 {
 161         struct drm_master *master = file_priv->master;
 162         int len, ret;
 163
 164         if (master->unique != NULL)
 165                 drm_unset_busid(dev, master);
 166
 167         if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE)) {
 168                 master->unique_len = 10 + strlen(dev->platformdev->name);
 169                 master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
 170
 171                 if (master->unique == NULL)
 172                         return -ENOMEM;
 173
 174                 len = snprintf(master->unique, master->unique_len,
 175                         "platform:%s", dev->platformdev->name);
 176
 177                 if (len > master->unique_len) {
 178                         DRM_ERROR("Unique buffer overflowed\n");
 179                         ret = -EINVAL;
 180                         goto err;
 181                 }
 182
 183                 dev->devname =
 184                         kmalloc(strlen(dev->platformdev->name) +
 185                                 master->unique_len + 2, GFP_KERNEL);
 186
 187                 if (dev->devname == NULL) {
 188                         ret = -ENOMEM;
 189                         goto err;
 190                 }
 191
 192                 sprintf(dev->devname, "%s@%s", dev->platformdev->name,
 193                         master->unique);
 194
 195         } else {
 196                 master->unique_len = 40;
 197                 master->unique_size = master->unique_len;
 198                 master->unique = kmalloc(master->unique_size, GFP_KERNEL);
 199                 if (master->unique == NULL)
 200                         return -ENOMEM;
 201
 202                 len = snprintf(master->unique, master->unique_len,
 203                         "pci:%04x:%02x:%02x.%d",
 204                         drm_get_pci_domain(dev),
 205                         dev->pdev->bus->number,
 206                         PCI_SLOT(dev->pdev->devfn),
 207                         PCI_FUNC(dev->pdev->devfn));
 208                 if (len >= master->unique_len) {
 209                         DRM_ERROR("buffer overflow");
 210                         ret = -EINVAL;
 211                         goto err;
 212                 } else
 213                         master->unique_len = len;
 214
 215                 dev->devname =
 216                         kmalloc(strlen(dev->driver->pci_driver.name) +
 217                                 master->unique_len + 2, GFP_KERNEL);
 218
 219                 if (dev->devname == NULL) {
 220                         ret = -ENOMEM;
 221                         goto err;
 222                 }
 223
 224                 sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
 225                         master->unique);
 226         }
 227
 228         return 0;
 229
 230 err:
 231         drm_unset_busid(dev, master);
 232         return ret;
 233 }
 234
 235 /**
 236  * Get a mapping information.
 237  *
 238  * \param inode device inode.
 239  * \param file_priv DRM file private.
 240  * \param cmd command.
 241  * \param arg user argument, pointing to a drm_map structure.
 242  *
 243  * \return zero on success or a negative number on failure.
 244  *
 245  * Searches for the mapping with the specified offset and copies its information
 246  * into userspace
 247  */
 248 int drm_getmap(struct drm_device *dev, void *data,
 249                struct drm_file *file_priv)
 250 {
 251         struct drm_map *map = data;
 252         struct drm_map_list *r_list = NULL;
 253         struct list_head *list;
 254         int idx;
 255         int i;
 256
 257         idx = map->offset;
 258
 259         mutex_lock(&dev->struct_mutex);
 260         if (idx < 0) {
 261                 mutex_unlock(&dev->struct_mutex);
 262                 return -EINVAL;
 263         }
 264
 265         i = 0;
 266         list_for_each(list, &dev->maplist) {
 267                 if (i == idx) {
 268                         r_list = list_entry(list, struct drm_map_list, head);
 269                         break;
 270                 }
 271                 i++;
 272         }
 273         if (!r_list || !r_list->map) {
 274                 mutex_unlock(&dev->struct_mutex);
 275                 return -EINVAL;
 276         }
 277
 278         map->offset = r_list->map->offset;
 279         map->size = r_list->map->size;
 280         map->type = r_list->map->type;
 281         map->flags = r_list->map->flags;
 282         map->handle = (void *)(unsigned long) r_list->user_token;
 283         map->mtrr = r_list->map->mtrr;
 284         mutex_unlock(&dev->struct_mutex);
 285
 286         return 0;
 287 }
 288
 289 /**
 290  * Get client information.
 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_client structure.
 296  *
 297  * \return zero on success or a negative number on failure.
 298  *
 299  * Searches for the client with the specified index and copies its information
 300  * into userspace
 301  */
 302 int drm_getclient(struct drm_device *dev, void *data,
 303                   struct drm_file *file_priv)
 304 {
 305         struct drm_client *client = data;
 306         struct drm_file *pt;
 307         int idx;
 308         int i;
 309
 310         idx = client->idx;
 311         mutex_lock(&dev->struct_mutex);
 312
 313         i = 0;
 314         list_for_each_entry(pt, &dev->filelist, lhead) {
 315                 if (i++ >= idx) {
 316                         client->auth = pt->authenticated;
 317                         client->pid = pt->pid;
 318                         client->uid = pt->uid;
 319                         client->magic = pt->magic;
 320                         client->iocs = pt->ioctl_count;
 321                         mutex_unlock(&dev->struct_mutex);
 322
 323                         return 0;
 324                 }
 325         }
 326         mutex_unlock(&dev->struct_mutex);
 327
 328         return -EINVAL;
 329 }
 330
 331 /**
 332  * Get statistics information.
 333  *
 334  * \param inode device inode.
 335  * \param file_priv DRM file private.
 336  * \param cmd command.
 337  * \param arg user argument, pointing to a drm_stats structure.
 338  *
 339  * \return zero on success or a negative number on failure.
 340  */
 341 int drm_getstats(struct drm_device *dev, void *data,
 342                  struct drm_file *file_priv)
 343 {
 344         struct drm_stats *stats = data;
 345         int i;
 346
 347         memset(stats, 0, sizeof(*stats));
 348
 349         mutex_lock(&dev->struct_mutex);
 350
 351         for (i = 0; i < dev->counters; i++) {
 352                 if (dev->types[i] == _DRM_STAT_LOCK)
 353                         stats->data[i].value =
 354                             (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
 355                 else
 356                         stats->data[i].value = atomic_read(&dev->counts[i]);
 357                 stats->data[i].type = dev->types[i];
 358         }
 359
 360         stats->count = dev->counters;
 361
 362         mutex_unlock(&dev->struct_mutex);
 363
 364         return 0;
 365 }
 366
 367 /**
 368  * Setversion ioctl.
 369  *
 370  * \param inode device inode.
 371  * \param file_priv DRM file private.
 372  * \param cmd command.
 373  * \param arg user argument, pointing to a drm_lock structure.
 374  * \return zero on success or negative number on failure.
 375  *
 376  * Sets the requested interface version
 377  */
 378 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 379 {
 380         struct drm_set_version *sv = data;
 381         int if_version, retcode = 0;
 382
 383         if (sv->drm_di_major != -1) {
 384                 if (sv->drm_di_major != DRM_IF_MAJOR ||
 385                     sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
 386                         retcode = -EINVAL;
 387                         goto done;
 388                 }
 389                 if_version = DRM_IF_VERSION(sv->drm_di_major,
 390                                             sv->drm_di_minor);
 391                 dev->if_version = max(if_version, dev->if_version);
 392                 if (sv->drm_di_minor >= 1) {
 393                         /*
 394                          * Version 1.1 includes tying of DRM to specific device
 395                          * Version 1.4 has proper PCI domain support
 396                          */
 397                         retcode = drm_set_busid(dev, file_priv);
 398                         if (retcode)
 399                                 goto done;
 400                 }
 401         }
 402
 403         if (sv->drm_dd_major != -1) {
 404                 if (sv->drm_dd_major != dev->driver->major ||
 405                     sv->drm_dd_minor < 0 || sv->drm_dd_minor >
 406                     dev->driver->minor) {
 407                         retcode = -EINVAL;
 408                         goto done;
 409                 }
 410
 411                 if (dev->driver->set_version)
 412                         dev->driver->set_version(dev, sv);
 413         }
 414
 415 done:
 416         sv->drm_di_major = DRM_IF_MAJOR;
 417         sv->drm_di_minor = DRM_IF_MINOR;
 418         sv->drm_dd_major = dev->driver->major;
 419         sv->drm_dd_minor = dev->driver->minor;
 420
 421         return retcode;
 422 }
 423
 424 /** No-op ioctl. */
 425 int drm_noop(struct drm_device *dev, void *data,
 426              struct drm_file *file_priv)
 427 {
 428         DRM_DEBUG("\n");
 429         return 0;
 430 }