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 <drm/drmP.h>
  37 #include <drm/drm_core.h>
  38
  39 #include <linux/pci.h>
  40 #include <linux/export.h>
  41
  42 /**
  43  * Get the bus id.
  44  *
  45  * \param inode device inode.
  46  * \param file_priv DRM file private.
  47  * \param cmd command.
  48  * \param arg user argument, pointing to a drm_unique structure.
  49  * \return zero on success or a negative number on failure.
  50  *
  51  * Copies the bus id from drm_device::unique into user space.
  52  */
  53 int drm_getunique(struct drm_device *dev, void *data,
  54                   struct drm_file *file_priv)
  55 {
  56         struct drm_unique *u = data;
  57         struct drm_master *master = file_priv->master;
  58
  59         if (u->unique_len >= master->unique_len) {
  60                 if (copy_to_user(u->unique, master->unique, master->unique_len))
  61                         return -EFAULT;
  62         }
  63         u->unique_len = master->unique_len;
  64
  65         return 0;
  66 }
  67
  68 static void
  69 drm_unset_busid(struct drm_device *dev,
  70                 struct drm_master *master)
  71 {
  72         kfree(dev->devname);
  73         dev->devname = NULL;
  74
  75         kfree(master->unique);
  76         master->unique = NULL;
  77         master->unique_len = 0;
  78         master->unique_size = 0;
  79 }
  80
  81 /**
  82  * Set the bus id.
  83  *
  84  * \param inode device inode.
  85  * \param file_priv DRM file private.
  86  * \param cmd command.
  87  * \param arg user argument, pointing to a drm_unique structure.
  88  * \return zero on success or a negative number on failure.
  89  *
  90  * Copies the bus id from userspace into drm_device::unique, and verifies that
  91  * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
  92  * in interface version 1.1 and will return EBUSY when setversion has requested
  93  * version 1.1 or greater.
  94  */
  95 int drm_setunique(struct drm_device *dev, void *data,
  96                   struct drm_file *file_priv)
  97 {
  98         struct drm_unique *u = data;
  99         struct drm_master *master = file_priv->master;
 100         int ret;
 101
 102         if (master->unique_len || master->unique)
 103                 return -EBUSY;
 104
 105         if (!u->unique_len || u->unique_len > 1024)
 106                 return -EINVAL;
 107
 108         if (!dev->driver->bus->set_unique)
 109                 return -EINVAL;
 110
 111         ret = dev->driver->bus->set_unique(dev, master, u);
 112         if (ret)
 113                 goto err;
 114
 115         return 0;
 116
 117 err:
 118         drm_unset_busid(dev, master);
 119         return ret;
 120 }
 121
 122 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 123 {
 124         struct drm_master *master = file_priv->master;
 125         int ret;
 126
 127         if (master->unique != NULL)
 128                 drm_unset_busid(dev, master);
 129
 130         ret = dev->driver->bus->set_busid(dev, master);
 131         if (ret)
 132                 goto err;
 133         return 0;
 134 err:
 135         drm_unset_busid(dev, master);
 136         return ret;
 137 }
 138
 139 /**
 140  * Get a mapping information.
 141  *
 142  * \param inode device inode.
 143  * \param file_priv DRM file private.
 144  * \param cmd command.
 145  * \param arg user argument, pointing to a drm_map structure.
 146  *
 147  * \return zero on success or a negative number on failure.
 148  *
 149  * Searches for the mapping with the specified offset and copies its information
 150  * into userspace
 151  */
 152 int drm_getmap(struct drm_device *dev, void *data,
 153                struct drm_file *file_priv)
 154 {
 155         struct drm_map *map = data;
 156         struct drm_map_list *r_list = NULL;
 157         struct list_head *list;
 158         int idx;
 159         int i;
 160
 161         idx = map->offset;
 162         if (idx < 0)
 163                 return -EINVAL;
 164
 165         i = 0;
 166         mutex_lock(&dev->struct_mutex);
 167         list_for_each(list, &dev->maplist) {
 168                 if (i == idx) {
 169                         r_list = list_entry(list, struct drm_map_list, head);
 170                         break;
 171                 }
 172                 i++;
 173         }
 174         if (!r_list || !r_list->map) {
 175                 mutex_unlock(&dev->struct_mutex);
 176                 return -EINVAL;
 177         }
 178
 179         map->offset = r_list->map->offset;
 180         map->size = r_list->map->size;
 181         map->type = r_list->map->type;
 182         map->flags = r_list->map->flags;
 183         map->handle = (void *)(unsigned long) r_list->user_token;
 184         map->mtrr = r_list->map->mtrr;
 185         mutex_unlock(&dev->struct_mutex);
 186
 187         return 0;
 188 }
 189
 190 /**
 191  * Get client 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_client structure.
 197  *
 198  * \return zero on success or a negative number on failure.
 199  *
 200  * Searches for the client with the specified index and copies its information
 201  * into userspace
 202  */
 203 int drm_getclient(struct drm_device *dev, void *data,
 204                   struct drm_file *file_priv)
 205 {
 206         struct drm_client *client = data;
 207         struct drm_file *pt;
 208         int idx;
 209         int i;
 210
 211         idx = client->idx;
 212         i = 0;
 213
 214         mutex_lock(&dev->struct_mutex);
 215         list_for_each_entry(pt, &dev->filelist, lhead) {
 216                 if (i++ >= idx) {
 217                         client->auth = pt->authenticated;
 218                         client->pid = pid_vnr(pt->pid);
 219                         client->uid = from_kuid_munged(current_user_ns(), pt->uid);
 220                         client->magic = pt->magic;
 221                         client->iocs = pt->ioctl_count;
 222                         mutex_unlock(&dev->struct_mutex);
 223
 224                         return 0;
 225                 }
 226         }
 227         mutex_unlock(&dev->struct_mutex);
 228
 229         return -EINVAL;
 230 }
 231
 232 /**
 233  * Get statistics information.
 234  *
 235  * \param inode device inode.
 236  * \param file_priv DRM file private.
 237  * \param cmd command.
 238  * \param arg user argument, pointing to a drm_stats structure.
 239  *
 240  * \return zero on success or a negative number on failure.
 241  */
 242 int drm_getstats(struct drm_device *dev, void *data,
 243                  struct drm_file *file_priv)
 244 {
 245         struct drm_stats *stats = data;
 246         int i;
 247
 248         memset(stats, 0, sizeof(*stats));
 249
 250         for (i = 0; i < dev->counters; i++) {
 251                 if (dev->types[i] == _DRM_STAT_LOCK)
 252                         stats->data[i].value =
 253                             (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
 254                 else
 255                         stats->data[i].value = atomic_read(&dev->counts[i]);
 256                 stats->data[i].type = dev->types[i];
 257         }
 258
 259         stats->count = dev->counters;
 260
 261         return 0;
 262 }
 263
 264 /**
 265  * Get device/driver capabilities
 266  */
 267 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 268 {
 269         struct drm_get_cap *req = data;
 270
 271         req->value = 0;
 272         switch (req->capability) {
 273         case DRM_CAP_DUMB_BUFFER:
 274                 if (dev->driver->dumb_create)
 275                         req->value = 1;
 276                 break;
 277         case DRM_CAP_VBLANK_HIGH_CRTC:
 278                 req->value = 1;
 279                 break;
 280         case DRM_CAP_DUMB_PREFERRED_DEPTH:
 281                 req->value = dev->mode_config.preferred_depth;
 282                 break;
 283         case DRM_CAP_DUMB_PREFER_SHADOW:
 284                 req->value = dev->mode_config.prefer_shadow;
 285                 break;
 286         case DRM_CAP_PRIME:
 287                 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
 288                 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
 289                 break;
 290         case DRM_CAP_TIMESTAMP_MONOTONIC:
 291                 req->value = drm_timestamp_monotonic;
 292                 break;
 293         default:
 294                 return -EINVAL;
 295         }
 296         return 0;
 297 }
 298
 299 /**
 300  * Setversion ioctl.
 301  *
 302  * \param inode device inode.
 303  * \param file_priv DRM file private.
 304  * \param cmd command.
 305  * \param arg user argument, pointing to a drm_lock structure.
 306  * \return zero on success or negative number on failure.
 307  *
 308  * Sets the requested interface version
 309  */
 310 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 311 {
 312         struct drm_set_version *sv = data;
 313         int if_version, retcode = 0;
 314
 315         if (sv->drm_di_major != -1) {
 316                 if (sv->drm_di_major != DRM_IF_MAJOR ||
 317                     sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
 318                         retcode = -EINVAL;
 319                         goto done;
 320                 }
 321                 if_version = DRM_IF_VERSION(sv->drm_di_major,
 322                                             sv->drm_di_minor);
 323                 dev->if_version = max(if_version, dev->if_version);
 324                 if (sv->drm_di_minor >= 1) {
 325                         /*
 326                          * Version 1.1 includes tying of DRM to specific device
 327                          * Version 1.4 has proper PCI domain support
 328                          */
 329                         retcode = drm_set_busid(dev, file_priv);
 330                         if (retcode)
 331                                 goto done;
 332                 }
 333         }
 334
 335         if (sv->drm_dd_major != -1) {
 336                 if (sv->drm_dd_major != dev->driver->major ||
 337                     sv->drm_dd_minor < 0 || sv->drm_dd_minor >
 338                     dev->driver->minor) {
 339                         retcode = -EINVAL;
 340                         goto done;
 341                 }
 342
 343                 if (dev->driver->set_version)
 344                         dev->driver->set_version(dev, sv);
 345         }
 346
 347 done:
 348         sv->drm_di_major = DRM_IF_MAJOR;
 349         sv->drm_di_minor = DRM_IF_MINOR;
 350         sv->drm_dd_major = dev->driver->major;
 351         sv->drm_dd_minor = dev->driver->minor;
 352
 353         return retcode;
 354 }
 355
 356 /** No-op ioctl. */
 357 int drm_noop(struct drm_device *dev, void *data,
 358              struct drm_file *file_priv)
 359 {
 360         DRM_DEBUG("\n");
 361         return 0;
 362 }
 363 EXPORT_SYMBOL(drm_noop);