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 (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE)) {
 136                 master->unique_len = 10 + strlen(dev->platformdev->name);
 137                 master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
 138
 139                 if (master->unique == NULL)
 140                         return -ENOMEM;
 141
 142                 len = snprintf(master->unique, master->unique_len,
 143                         "platform:%s", dev->platformdev->name);
 144
 145                 if (len > master->unique_len)
 146                         DRM_ERROR("Unique buffer overflowed\n");
 147
 148                 dev->devname =
 149                         kmalloc(strlen(dev->platformdev->name) +
 150                                 master->unique_len + 2, GFP_KERNEL);
 151
 152                 if (dev->devname == NULL)
 153                         return -ENOMEM;
 154
 155                 sprintf(dev->devname, "%s@%s", dev->platformdev->name,
 156                         master->unique);
 157
 158         } else {
 159                 master->unique_len = 40;
 160                 master->unique_size = master->unique_len;
 161                 master->unique = kmalloc(master->unique_size, GFP_KERNEL);
 162                 if (master->unique == NULL)
 163                         return -ENOMEM;
 164
 165                 len = snprintf(master->unique, master->unique_len,
 166                         "pci:%04x:%02x:%02x.%d",
 167                         drm_get_pci_domain(dev),
 168                         dev->pdev->bus->number,
 169                         PCI_SLOT(dev->pdev->devfn),
 170                         PCI_FUNC(dev->pdev->devfn));
 171                 if (len >= master->unique_len)
 172                         DRM_ERROR("buffer overflow");
 173                 else
 174                         master->unique_len = len;
 175
 176                 dev->devname =
 177                         kmalloc(strlen(dev->driver->pci_driver.name) +
 178                                 master->unique_len + 2, GFP_KERNEL);
 179
 180                 if (dev->devname == NULL)
 181                         return -ENOMEM;
 182
 183                 sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
 184                         master->unique);
 185         }
 186
 187         return 0;
 188 }
 189
 190 /**
 191  * Get a mapping information.
 192  *
 193  * \param inode device inode.
 194  * \param file_priv DRM file private.
 195  * \param cmd command.
 196  * \param arg user argument, pointing to a drm_map structure.
 197  *
 198  * \return zero on success or a negative number on failure.
 199  *
 200  * Searches for the mapping with the specified offset and copies its information
 201  * into userspace
 202  */
 203 int drm_getmap(struct drm_device *dev, void *data,
 204                struct drm_file *file_priv)
 205 {
 206         struct drm_map *map = data;
 207         struct drm_map_list *r_list = NULL;
 208         struct list_head *list;
 209         int idx;
 210         int i;
 211
 212         idx = map->offset;
 213
 214         mutex_lock(&dev->struct_mutex);
 215         if (idx < 0) {
 216                 mutex_unlock(&dev->struct_mutex);
 217                 return -EINVAL;
 218         }
 219
 220         i = 0;
 221         list_for_each(list, &dev->maplist) {
 222                 if (i == idx) {
 223                         r_list = list_entry(list, struct drm_map_list, head);
 224                         break;
 225                 }
 226                 i++;
 227         }
 228         if (!r_list || !r_list->map) {
 229                 mutex_unlock(&dev->struct_mutex);
 230                 return -EINVAL;
 231         }
 232
 233         map->offset = r_list->map->offset;
 234         map->size = r_list->map->size;
 235         map->type = r_list->map->type;
 236         map->flags = r_list->map->flags;
 237         map->handle = (void *)(unsigned long) r_list->user_token;
 238         map->mtrr = r_list->map->mtrr;
 239         mutex_unlock(&dev->struct_mutex);
 240
 241         return 0;
 242 }
 243
 244 /**
 245  * Get client information.
 246  *
 247  * \param inode device inode.
 248  * \param file_priv DRM file private.
 249  * \param cmd command.
 250  * \param arg user argument, pointing to a drm_client structure.
 251  *
 252  * \return zero on success or a negative number on failure.
 253  *
 254  * Searches for the client with the specified index and copies its information
 255  * into userspace
 256  */
 257 int drm_getclient(struct drm_device *dev, void *data,
 258                   struct drm_file *file_priv)
 259 {
 260         struct drm_client *client = data;
 261         struct drm_file *pt;
 262         int idx;
 263         int i;
 264
 265         idx = client->idx;
 266         mutex_lock(&dev->struct_mutex);
 267
 268         i = 0;
 269         list_for_each_entry(pt, &dev->filelist, lhead) {
 270                 if (i++ >= idx) {
 271                         client->auth = pt->authenticated;
 272                         client->pid = pt->pid;
 273                         client->uid = pt->uid;
 274                         client->magic = pt->magic;
 275                         client->iocs = pt->ioctl_count;
 276                         mutex_unlock(&dev->struct_mutex);
 277
 278                         return 0;
 279                 }
 280         }
 281         mutex_unlock(&dev->struct_mutex);
 282
 283         return -EINVAL;
 284 }
 285
 286 /**
 287  * Get statistics information.
 288  *
 289  * \param inode device inode.
 290  * \param file_priv DRM file private.
 291  * \param cmd command.
 292  * \param arg user argument, pointing to a drm_stats structure.
 293  *
 294  * \return zero on success or a negative number on failure.
 295  */
 296 int drm_getstats(struct drm_device *dev, void *data,
 297                  struct drm_file *file_priv)
 298 {
 299         struct drm_stats *stats = data;
 300         int i;
 301
 302         memset(stats, 0, sizeof(*stats));
 303
 304         mutex_lock(&dev->struct_mutex);
 305
 306         for (i = 0; i < dev->counters; i++) {
 307                 if (dev->types[i] == _DRM_STAT_LOCK)
 308                         stats->data[i].value =
 309                             (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
 310                 else
 311                         stats->data[i].value = atomic_read(&dev->counts[i]);
 312                 stats->data[i].type = dev->types[i];
 313         }
 314
 315         stats->count = dev->counters;
 316
 317         mutex_unlock(&dev->struct_mutex);
 318
 319         return 0;
 320 }
 321
 322 /**
 323  * Setversion ioctl.
 324  *
 325  * \param inode device inode.
 326  * \param file_priv DRM file private.
 327  * \param cmd command.
 328  * \param arg user argument, pointing to a drm_lock structure.
 329  * \return zero on success or negative number on failure.
 330  *
 331  * Sets the requested interface version
 332  */
 333 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 334 {
 335         struct drm_set_version *sv = data;
 336         int if_version, retcode = 0;
 337
 338         if (sv->drm_di_major != -1) {
 339                 if (sv->drm_di_major != DRM_IF_MAJOR ||
 340                     sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
 341                         retcode = -EINVAL;
 342                         goto done;
 343                 }
 344                 if_version = DRM_IF_VERSION(sv->drm_di_major,
 345                                             sv->drm_di_minor);
 346                 dev->if_version = max(if_version, dev->if_version);
 347                 if (sv->drm_di_minor >= 1) {
 348                         /*
 349                          * Version 1.1 includes tying of DRM to specific device
 350                          */
 351                         drm_set_busid(dev, file_priv);
 352                 }
 353         }
 354
 355         if (sv->drm_dd_major != -1) {
 356                 if (sv->drm_dd_major != dev->driver->major ||
 357                     sv->drm_dd_minor < 0 || sv->drm_dd_minor >
 358                     dev->driver->minor) {
 359                         retcode = -EINVAL;
 360                         goto done;
 361                 }
 362
 363                 if (dev->driver->set_version)
 364                         dev->driver->set_version(dev, sv);
 365         }
 366
 367 done:
 368         sv->drm_di_major = DRM_IF_MAJOR;
 369         sv->drm_di_minor = DRM_IF_MINOR;
 370         sv->drm_dd_major = dev->driver->major;
 371         sv->drm_dd_minor = dev->driver->minor;
 372
 373         return retcode;
 374 }
 375
 376 /** No-op ioctl. */
 377 int drm_noop(struct drm_device *dev, void *data,
 378              struct drm_file *file_priv)
 379 {
 380         DRM_DEBUG("\n");
 381         return 0;
 382 }