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