drivers/char/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
  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 }