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(dev->devname);
  76         dev->devname = NULL;
  77
  78         kfree(master->unique);
  79         master->unique = NULL;
  80         master->unique_len = 0;
  81         master->unique_size = 0;
  82 }
  83
  84 /**
  85  * Set the bus id.
  86  *
  87  * \param inode device inode.
  88  * \param file_priv DRM file private.
  89  * \param cmd command.
  90  * \param arg user argument, pointing to a drm_unique structure.
  91  * \return zero on success or a negative number on failure.
  92  *
  93  * Copies the bus id from userspace into drm_device::unique, and verifies that
  94  * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
  95  * in interface version 1.1 and will return EBUSY when setversion has requested
  96  * version 1.1 or greater.
  97  */
  98 int drm_setunique(struct drm_device *dev, void *data,
  99                   struct drm_file *file_priv)
 100 {
 101         struct drm_unique *u = data;
 102         struct drm_master *master = file_priv->master;
 103         int ret;
 104
 105         if (master->unique_len || master->unique)
 106                 return -EBUSY;
 107
 108         if (!u->unique_len || u->unique_len > 1024)
 109                 return -EINVAL;
 110
 111         if (!dev->driver->bus->set_unique)
 112                 return -EINVAL;
 113
 114         ret = dev->driver->bus->set_unique(dev, master, u);
 115         if (ret)
 116                 goto err;
 117
 118         return 0;
 119
 120 err:
 121         drm_unset_busid(dev, master);
 122         return ret;
 123 }
 124
 125 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 126 {
 127         struct drm_master *master = file_priv->master;
 128         int ret;
 129
 130         if (master->unique != NULL)
 131                 drm_unset_busid(dev, master);
 132
 133         ret = dev->driver->bus->set_busid(dev, master);
 134         if (ret)
 135                 goto err;
 136         return 0;
 137 err:
 138         drm_unset_busid(dev, master);
 139         return ret;
 140 }
 141
 142 /**
 143  * Get a mapping information.
 144  *
 145  * \param inode device inode.
 146  * \param file_priv DRM file private.
 147  * \param cmd command.
 148  * \param arg user argument, pointing to a drm_map structure.
 149  *
 150  * \return zero on success or a negative number on failure.
 151  *
 152  * Searches for the mapping with the specified offset and copies its information
 153  * into userspace
 154  */
 155 int drm_getmap(struct drm_device *dev, void *data,
 156                struct drm_file *file_priv)
 157 {
 158         struct drm_map *map = data;
 159         struct drm_map_list *r_list = NULL;
 160         struct list_head *list;
 161         int idx;
 162         int i;
 163
 164         idx = map->offset;
 165         if (idx < 0)
 166                 return -EINVAL;
 167
 168         i = 0;
 169         mutex_lock(&dev->struct_mutex);
 170         list_for_each(list, &dev->maplist) {
 171                 if (i == idx) {
 172                         r_list = list_entry(list, struct drm_map_list, head);
 173                         break;
 174                 }
 175                 i++;
 176         }
 177         if (!r_list || !r_list->map) {
 178                 mutex_unlock(&dev->struct_mutex);
 179                 return -EINVAL;
 180         }
 181
 182         map->offset = r_list->map->offset;
 183         map->size = r_list->map->size;
 184         map->type = r_list->map->type;
 185         map->flags = r_list->map->flags;
 186         map->handle = (void *)(unsigned long) r_list->user_token;
 187
 188 #ifdef CONFIG_X86
 189         /*
 190          * There appears to be exactly one user of the mtrr index: dritest.
 191          * It's easy enough to keep it working on non-PAT systems.
 192          */
 193         map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
 194 #else
 195         map->mtrr = -1;
 196 #endif
 197
 198         mutex_unlock(&dev->struct_mutex);
 199
 200         return 0;
 201 }
 202
 203 /**
 204  * Get client information.
 205  *
 206  * \param inode device inode.
 207  * \param file_priv DRM file private.
 208  * \param cmd command.
 209  * \param arg user argument, pointing to a drm_client structure.
 210  *
 211  * \return zero on success or a negative number on failure.
 212  *
 213  * Searches for the client with the specified index and copies its information
 214  * into userspace
 215  */
 216 int drm_getclient(struct drm_device *dev, void *data,
 217                   struct drm_file *file_priv)
 218 {
 219         struct drm_client *client = data;
 220
 221         /*
 222          * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
 223          * not breaking completely. Userspace tools stop enumerating one they
 224          * get -EINVAL, hence this is the return value we need to hand back for
 225          * no clients tracked.
 226          *
 227          * Unfortunately some clients (*cough* libva *cough*) use this in a fun
 228          * attempt to figure out whether they're authenticated or not. Since
 229          * that's the only thing they care about, give it to the directly
 230          * instead of walking one giant list.
 231          */
 232         if (client->idx == 0) {
 233                 client->auth = file_priv->authenticated;
 234                 client->pid = pid_vnr(file_priv->pid);
 235                 client->uid = from_kuid_munged(current_user_ns(),
 236                                                file_priv->uid);
 237                 client->magic = 0;
 238                 client->iocs = 0;
 239
 240                 return 0;
 241         } else {
 242                 return -EINVAL;
 243         }
 244 }
 245
 246 /**
 247  * Get statistics information.
 248  *
 249  * \param inode device inode.
 250  * \param file_priv DRM file private.
 251  * \param cmd command.
 252  * \param arg user argument, pointing to a drm_stats structure.
 253  *
 254  * \return zero on success or a negative number on failure.
 255  */
 256 int drm_getstats(struct drm_device *dev, void *data,
 257                  struct drm_file *file_priv)
 258 {
 259         struct drm_stats *stats = data;
 260
 261         /* Clear stats to prevent userspace from eating its stack garbage. */
 262         memset(stats, 0, sizeof(*stats));
 263
 264         return 0;
 265 }
 266
 267 /**
 268  * Get device/driver capabilities
 269  */
 270 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 271 {
 272         struct drm_get_cap *req = data;
 273
 274         req->value = 0;
 275         switch (req->capability) {
 276         case DRM_CAP_DUMB_BUFFER:
 277                 if (dev->driver->dumb_create)
 278                         req->value = 1;
 279                 break;
 280         case DRM_CAP_VBLANK_HIGH_CRTC:
 281                 req->value = 1;
 282                 break;
 283         case DRM_CAP_DUMB_PREFERRED_DEPTH:
 284                 req->value = dev->mode_config.preferred_depth;
 285                 break;
 286         case DRM_CAP_DUMB_PREFER_SHADOW:
 287                 req->value = dev->mode_config.prefer_shadow;
 288                 break;
 289         case DRM_CAP_PRIME:
 290                 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
 291                 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
 292                 break;
 293         case DRM_CAP_TIMESTAMP_MONOTONIC:
 294                 req->value = drm_timestamp_monotonic;
 295                 break;
 296         case DRM_CAP_ASYNC_PAGE_FLIP:
 297                 req->value = dev->mode_config.async_page_flip;
 298                 break;
 299         default:
 300                 return -EINVAL;
 301         }
 302         return 0;
 303 }
 304
 305 /**
 306  * Setversion ioctl.
 307  *
 308  * \param inode device inode.
 309  * \param file_priv DRM file private.
 310  * \param cmd command.
 311  * \param arg user argument, pointing to a drm_lock structure.
 312  * \return zero on success or negative number on failure.
 313  *
 314  * Sets the requested interface version
 315  */
 316 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 317 {
 318         struct drm_set_version *sv = data;
 319         int if_version, retcode = 0;
 320
 321         if (sv->drm_di_major != -1) {
 322                 if (sv->drm_di_major != DRM_IF_MAJOR ||
 323                     sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
 324                         retcode = -EINVAL;
 325                         goto done;
 326                 }
 327                 if_version = DRM_IF_VERSION(sv->drm_di_major,
 328                                             sv->drm_di_minor);
 329                 dev->if_version = max(if_version, dev->if_version);
 330                 if (sv->drm_di_minor >= 1) {
 331                         /*
 332                          * Version 1.1 includes tying of DRM to specific device
 333                          * Version 1.4 has proper PCI domain support
 334                          */
 335                         retcode = drm_set_busid(dev, file_priv);
 336                         if (retcode)
 337                                 goto done;
 338                 }
 339         }
 340
 341         if (sv->drm_dd_major != -1) {
 342                 if (sv->drm_dd_major != dev->driver->major ||
 343                     sv->drm_dd_minor < 0 || sv->drm_dd_minor >
 344                     dev->driver->minor) {
 345                         retcode = -EINVAL;
 346                         goto done;
 347                 }
 348         }
 349
 350 done:
 351         sv->drm_di_major = DRM_IF_MAJOR;
 352         sv->drm_di_minor = DRM_IF_MINOR;
 353         sv->drm_dd_major = dev->driver->major;
 354         sv->drm_dd_minor = dev->driver->minor;
 355
 356         return retcode;
 357 }
 358
 359 /** No-op ioctl. */
 360 int drm_noop(struct drm_device *dev, void *data,
 361              struct drm_file *file_priv)
 362 {
 363         DRM_DEBUG("\n");
 364         return 0;
 365 }
 366 EXPORT_SYMBOL(drm_noop);