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 #ifdef CONFIG_X86
  42 #include <asm/mtrr.h>
  43 #endif
  44
  45 /**
  46  * Get the bus id.
  47  *
  48  * \param inode device inode.
  49  * \param file_priv DRM file private.
  50  * \param cmd command.
  51  * \param arg user argument, pointing to a drm_unique structure.
  52  * \return zero on success or a negative number on failure.
  53  *
  54  * Copies the bus id from drm_device::unique into user space.
  55  */
  56 int drm_getunique(struct drm_device *dev, void *data,
  57                   struct drm_file *file_priv)
  58 {
  59         struct drm_unique *u = data;
  60         struct drm_master *master = file_priv->master;
  61
  62         if (u->unique_len >= master->unique_len) {
  63                 if (copy_to_user(u->unique, master->unique, master->unique_len))
  64                         return -EFAULT;
  65         }
  66         u->unique_len = master->unique_len;
  67
  68         return 0;
  69 }
  70
  71 static void
  72 drm_unset_busid(struct drm_device *dev,
  73                 struct drm_master *master)
  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. Also note that KMS is all version 1.1 and later and
  94  * UMS was only ever supported on pci devices.
  95  */
  96 int drm_setunique(struct drm_device *dev, void *data,
  97                   struct drm_file *file_priv)
  98 {
  99         struct drm_unique *u = data;
 100         struct drm_master *master = file_priv->master;
 101         int ret;
 102
 103         if (master->unique_len || master->unique)
 104                 return -EBUSY;
 105
 106         if (!u->unique_len || u->unique_len > 1024)
 107                 return -EINVAL;
 108
 109         if (drm_core_check_feature(dev, DRIVER_MODESET))
 110                 return 0;
 111
 112         if (WARN_ON(!dev->pdev))
 113                 return -EINVAL;
 114
 115         ret = drm_pci_set_unique(dev, master, u);
 116         if (ret)
 117                 goto err;
 118
 119         return 0;
 120
 121 err:
 122         drm_unset_busid(dev, master);
 123         return ret;
 124 }
 125
 126 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 127 {
 128         struct drm_master *master = file_priv->master;
 129         int ret;
 130
 131         if (master->unique != NULL)
 132                 drm_unset_busid(dev, master);
 133
 134         if (dev->driver->bus && dev->driver->bus->set_busid) {
 135                 ret = dev->driver->bus->set_busid(dev, master);
 136                 if (ret) {
 137                         drm_unset_busid(dev, master);
 138                         return ret;
 139                 }
 140         } else {
 141                 if (WARN(dev->unique == NULL,
 142                          "No drm_bus.set_busid() implementation provided by "
 143                          "%ps. Use drm_dev_set_unique() to set the unique "
 144                          "name explicitly.", dev->driver))
 145                         return -EINVAL;
 146
 147                 master->unique = kstrdup(dev->unique, GFP_KERNEL);
 148                 if (master->unique)
 149                         master->unique_len = strlen(dev->unique);
 150         }
 151
 152         return 0;
 153 }
 154
 155 /**
 156  * Get a mapping information.
 157  *
 158  * \param inode device inode.
 159  * \param file_priv DRM file private.
 160  * \param cmd command.
 161  * \param arg user argument, pointing to a drm_map structure.
 162  *
 163  * \return zero on success or a negative number on failure.
 164  *
 165  * Searches for the mapping with the specified offset and copies its information
 166  * into userspace
 167  */
 168 int drm_getmap(struct drm_device *dev, void *data,
 169                struct drm_file *file_priv)
 170 {
 171         struct drm_map *map = data;
 172         struct drm_map_list *r_list = NULL;
 173         struct list_head *list;
 174         int idx;
 175         int i;
 176
 177         idx = map->offset;
 178         if (idx < 0)
 179                 return -EINVAL;
 180
 181         i = 0;
 182         mutex_lock(&dev->struct_mutex);
 183         list_for_each(list, &dev->maplist) {
 184                 if (i == idx) {
 185                         r_list = list_entry(list, struct drm_map_list, head);
 186                         break;
 187                 }
 188                 i++;
 189         }
 190         if (!r_list || !r_list->map) {
 191                 mutex_unlock(&dev->struct_mutex);
 192                 return -EINVAL;
 193         }
 194
 195         map->offset = r_list->map->offset;
 196         map->size = r_list->map->size;
 197         map->type = r_list->map->type;
 198         map->flags = r_list->map->flags;
 199         map->handle = (void *)(unsigned long) r_list->user_token;
 200
 201 #ifdef CONFIG_X86
 202         /*
 203          * There appears to be exactly one user of the mtrr index: dritest.
 204          * It's easy enough to keep it working on non-PAT systems.
 205          */
 206         map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
 207 #else
 208         map->mtrr = -1;
 209 #endif
 210
 211         mutex_unlock(&dev->struct_mutex);
 212
 213         return 0;
 214 }
 215
 216 /**
 217  * Get client information.
 218  *
 219  * \param inode device inode.
 220  * \param file_priv DRM file private.
 221  * \param cmd command.
 222  * \param arg user argument, pointing to a drm_client structure.
 223  *
 224  * \return zero on success or a negative number on failure.
 225  *
 226  * Searches for the client with the specified index and copies its information
 227  * into userspace
 228  */
 229 int drm_getclient(struct drm_device *dev, void *data,
 230                   struct drm_file *file_priv)
 231 {
 232         struct drm_client *client = data;
 233
 234         /*
 235          * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
 236          * not breaking completely. Userspace tools stop enumerating one they
 237          * get -EINVAL, hence this is the return value we need to hand back for
 238          * no clients tracked.
 239          *
 240          * Unfortunately some clients (*cough* libva *cough*) use this in a fun
 241          * attempt to figure out whether they're authenticated or not. Since
 242          * that's the only thing they care about, give it to the directly
 243          * instead of walking one giant list.
 244          */
 245         if (client->idx == 0) {
 246                 client->auth = file_priv->authenticated;
 247                 client->pid = pid_vnr(file_priv->pid);
 248                 client->uid = from_kuid_munged(current_user_ns(),
 249                                                file_priv->uid);
 250                 client->magic = 0;
 251                 client->iocs = 0;
 252
 253                 return 0;
 254         } else {
 255                 return -EINVAL;
 256         }
 257 }
 258
 259 /**
 260  * Get statistics information.
 261  *
 262  * \param inode device inode.
 263  * \param file_priv DRM file private.
 264  * \param cmd command.
 265  * \param arg user argument, pointing to a drm_stats structure.
 266  *
 267  * \return zero on success or a negative number on failure.
 268  */
 269 int drm_getstats(struct drm_device *dev, void *data,
 270                  struct drm_file *file_priv)
 271 {
 272         struct drm_stats *stats = data;
 273
 274         /* Clear stats to prevent userspace from eating its stack garbage. */
 275         memset(stats, 0, sizeof(*stats));
 276
 277         return 0;
 278 }
 279
 280 /**
 281  * Get device/driver capabilities
 282  */
 283 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 284 {
 285         struct drm_get_cap *req = data;
 286
 287         req->value = 0;
 288         switch (req->capability) {
 289         case DRM_CAP_DUMB_BUFFER:
 290                 if (dev->driver->dumb_create)
 291                         req->value = 1;
 292                 break;
 293         case DRM_CAP_VBLANK_HIGH_CRTC:
 294                 req->value = 1;
 295                 break;
 296         case DRM_CAP_DUMB_PREFERRED_DEPTH:
 297                 req->value = dev->mode_config.preferred_depth;
 298                 break;
 299         case DRM_CAP_DUMB_PREFER_SHADOW:
 300                 req->value = dev->mode_config.prefer_shadow;
 301                 break;
 302         case DRM_CAP_PRIME:
 303                 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
 304                 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
 305                 break;
 306         case DRM_CAP_TIMESTAMP_MONOTONIC:
 307                 req->value = drm_timestamp_monotonic;
 308                 break;
 309         case DRM_CAP_ASYNC_PAGE_FLIP:
 310                 req->value = dev->mode_config.async_page_flip;
 311                 break;
 312         case DRM_CAP_CURSOR_WIDTH:
 313                 if (dev->mode_config.cursor_width)
 314                         req->value = dev->mode_config.cursor_width;
 315                 else
 316                         req->value = 64;
 317                 break;
 318         case DRM_CAP_CURSOR_HEIGHT:
 319                 if (dev->mode_config.cursor_height)
 320                         req->value = dev->mode_config.cursor_height;
 321                 else
 322                         req->value = 64;
 323                 break;
 324         default:
 325                 return -EINVAL;
 326         }
 327         return 0;
 328 }
 329
 330 /**
 331  * Set device/driver capabilities
 332  */
 333 int
 334 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 335 {
 336         struct drm_set_client_cap *req = data;
 337
 338         switch (req->capability) {
 339         case DRM_CLIENT_CAP_STEREO_3D:
 340                 if (req->value > 1)
 341                         return -EINVAL;
 342                 file_priv->stereo_allowed = req->value;
 343                 break;
 344         case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
 345                 if (!drm_universal_planes)
 346                         return -EINVAL;
 347                 if (req->value > 1)
 348                         return -EINVAL;
 349                 file_priv->universal_planes = req->value;
 350                 break;
 351         default:
 352                 return -EINVAL;
 353         }
 354
 355         return 0;
 356 }
 357
 358 /**
 359  * Setversion ioctl.
 360  *
 361  * \param inode device inode.
 362  * \param file_priv DRM file private.
 363  * \param cmd command.
 364  * \param arg user argument, pointing to a drm_lock structure.
 365  * \return zero on success or negative number on failure.
 366  *
 367  * Sets the requested interface version
 368  */
 369 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 370 {
 371         struct drm_set_version *sv = data;
 372         int if_version, retcode = 0;
 373
 374         if (sv->drm_di_major != -1) {
 375                 if (sv->drm_di_major != DRM_IF_MAJOR ||
 376                     sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
 377                         retcode = -EINVAL;
 378                         goto done;
 379                 }
 380                 if_version = DRM_IF_VERSION(sv->drm_di_major,
 381                                             sv->drm_di_minor);
 382                 dev->if_version = max(if_version, dev->if_version);
 383                 if (sv->drm_di_minor >= 1) {
 384                         /*
 385                          * Version 1.1 includes tying of DRM to specific device
 386                          * Version 1.4 has proper PCI domain support
 387                          */
 388                         retcode = drm_set_busid(dev, file_priv);
 389                         if (retcode)
 390                                 goto done;
 391                 }
 392         }
 393
 394         if (sv->drm_dd_major != -1) {
 395                 if (sv->drm_dd_major != dev->driver->major ||
 396                     sv->drm_dd_minor < 0 || sv->drm_dd_minor >
 397                     dev->driver->minor) {
 398                         retcode = -EINVAL;
 399                         goto done;
 400                 }
 401         }
 402
 403 done:
 404         sv->drm_di_major = DRM_IF_MAJOR;
 405         sv->drm_di_minor = DRM_IF_MINOR;
 406         sv->drm_dd_major = dev->driver->major;
 407         sv->drm_dd_minor = dev->driver->minor;
 408
 409         return retcode;
 410 }
 411
 412 /** No-op ioctl. */
 413 int drm_noop(struct drm_device *dev, void *data,
 414              struct drm_file *file_priv)
 415 {
 416         DRM_DEBUG("\n");
 417         return 0;
 418 }
 419 EXPORT_SYMBOL(drm_noop);