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 /**
  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 }