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 static void
  68 drm_unset_busid(struct drm_device *dev,
  69                 struct drm_master *master)
  70 {
  71         kfree(dev->devname);
  72         dev->devname = NULL;
  73
  74         kfree(master->unique);
  75         master->unique = NULL;
  76         master->unique_len = 0;
  77         master->unique_size = 0;
  78 }
  79
  80 /**
  81  * Set the bus id.
  82  *
  83  * \param inode device inode.
  84  * \param file_priv DRM file private.
  85  * \param cmd command.
  86  * \param arg user argument, pointing to a drm_unique structure.
  87  * \return zero on success or a negative number on failure.
  88  *
  89  * Copies the bus id from userspace into drm_device::unique, and verifies that
  90  * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
  91  * in interface version 1.1 and will return EBUSY when setversion has requested
  92  * version 1.1 or greater.
  93  */
  94 int drm_setunique(struct drm_device *dev, void *data,
  95                   struct drm_file *file_priv)
  96 {
  97         struct drm_unique *u = data;
  98         struct drm_master *master = file_priv->master;
  99         int ret;
 100
 101         if (master->unique_len || master->unique)
 102                 return -EBUSY;
 103
 104         if (!u->unique_len || u->unique_len > 1024)
 105                 return -EINVAL;
 106
 107         if (!dev->driver->bus->set_unique)
 108                 return -EINVAL;
 109
 110         ret = dev->driver->bus->set_unique(dev, master, u);
 111         if (ret)
 112                 goto err;
 113
 114         return 0;
 115
 116 err:
 117         drm_unset_busid(dev, master);
 118         return ret;
 119 }
 120
 121 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 122 {
 123         struct drm_master *master = file_priv->master;
 124         int ret;
 125
 126         if (master->unique != NULL)
 127                 drm_unset_busid(dev, master);
 128
 129         ret = dev->driver->bus->set_busid(dev, master);
 130         if (ret)
 131                 goto err;
 132         return 0;
 133 err:
 134         drm_unset_busid(dev, master);
 135         return ret;
 136 }
 137
 138 /**
 139  * Get a mapping information.
 140  *
 141  * \param inode device inode.
 142  * \param file_priv DRM file private.
 143  * \param cmd command.
 144  * \param arg user argument, pointing to a drm_map structure.
 145  *
 146  * \return zero on success or a negative number on failure.
 147  *
 148  * Searches for the mapping with the specified offset and copies its information
 149  * into userspace
 150  */
 151 int drm_getmap(struct drm_device *dev, void *data,
 152                struct drm_file *file_priv)
 153 {
 154         struct drm_map *map = data;
 155         struct drm_map_list *r_list = NULL;
 156         struct list_head *list;
 157         int idx;
 158         int i;
 159
 160         idx = map->offset;
 161         if (idx < 0)
 162                 return -EINVAL;
 163
 164         i = 0;
 165         mutex_lock(&dev->struct_mutex);
 166         list_for_each(list, &dev->maplist) {
 167                 if (i == idx) {
 168                         r_list = list_entry(list, struct drm_map_list, head);
 169                         break;
 170                 }
 171                 i++;
 172         }
 173         if (!r_list || !r_list->map) {
 174                 mutex_unlock(&dev->struct_mutex);
 175                 return -EINVAL;
 176         }
 177
 178         map->offset = r_list->map->offset;
 179         map->size = r_list->map->size;
 180         map->type = r_list->map->type;
 181         map->flags = r_list->map->flags;
 182         map->handle = (void *)(unsigned long) r_list->user_token;
 183         map->mtrr = r_list->map->mtrr;
 184         mutex_unlock(&dev->struct_mutex);
 185
 186         return 0;
 187 }
 188
 189 /**
 190  * Get client information.
 191  *
 192  * \param inode device inode.
 193  * \param file_priv DRM file private.
 194  * \param cmd command.
 195  * \param arg user argument, pointing to a drm_client structure.
 196  *
 197  * \return zero on success or a negative number on failure.
 198  *
 199  * Searches for the client with the specified index and copies its information
 200  * into userspace
 201  */
 202 int drm_getclient(struct drm_device *dev, void *data,
 203                   struct drm_file *file_priv)
 204 {
 205         struct drm_client *client = data;
 206         struct drm_file *pt;
 207         int idx;
 208         int i;
 209
 210         idx = client->idx;
 211         i = 0;
 212
 213         mutex_lock(&dev->struct_mutex);
 214         list_for_each_entry(pt, &dev->filelist, lhead) {
 215                 if (i++ >= idx) {
 216                         client->auth = pt->authenticated;
 217                         client->pid = pt->pid;
 218                         client->uid = pt->uid;
 219                         client->magic = pt->magic;
 220                         client->iocs = pt->ioctl_count;
 221                         mutex_unlock(&dev->struct_mutex);
 222
 223                         return 0;
 224                 }
 225         }
 226         mutex_unlock(&dev->struct_mutex);
 227
 228         return -EINVAL;
 229 }
 230
 231 /**
 232  * Get statistics information.
 233  *
 234  * \param inode device inode.
 235  * \param file_priv DRM file private.
 236  * \param cmd command.
 237  * \param arg user argument, pointing to a drm_stats structure.
 238  *
 239  * \return zero on success or a negative number on failure.
 240  */
 241 int drm_getstats(struct drm_device *dev, void *data,
 242                  struct drm_file *file_priv)
 243 {
 244         struct drm_stats *stats = data;
 245         int i;
 246
 247         memset(stats, 0, sizeof(*stats));
 248
 249         for (i = 0; i < dev->counters; i++) {
 250                 if (dev->types[i] == _DRM_STAT_LOCK)
 251                         stats->data[i].value =
 252                             (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
 253                 else
 254                         stats->data[i].value = atomic_read(&dev->counts[i]);
 255                 stats->data[i].type = dev->types[i];
 256         }
 257
 258         stats->count = dev->counters;
 259
 260         return 0;
 261 }
 262
 263 /**
 264  * Get device/driver capabilities
 265  */
 266 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 267 {
 268         struct drm_get_cap *req = data;
 269
 270         req->value = 0;
 271         switch (req->capability) {
 272         case DRM_CAP_DUMB_BUFFER:
 273                 if (dev->driver->dumb_create)
 274                         req->value = 1;
 275                 break;
 276         case DRM_CAP_VBLANK_HIGH_CRTC:
 277                 req->value = 1;
 278                 break;
 279         default:
 280                 return -EINVAL;
 281         }
 282         return 0;
 283 }
 284
 285 /**
 286  * Setversion ioctl.
 287  *
 288  * \param inode device inode.
 289  * \param file_priv DRM file private.
 290  * \param cmd command.
 291  * \param arg user argument, pointing to a drm_lock structure.
 292  * \return zero on success or negative number on failure.
 293  *
 294  * Sets the requested interface version
 295  */
 296 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 297 {
 298         struct drm_set_version *sv = data;
 299         int if_version, retcode = 0;
 300
 301         if (sv->drm_di_major != -1) {
 302                 if (sv->drm_di_major != DRM_IF_MAJOR ||
 303                     sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
 304                         retcode = -EINVAL;
 305                         goto done;
 306                 }
 307                 if_version = DRM_IF_VERSION(sv->drm_di_major,
 308                                             sv->drm_di_minor);
 309                 dev->if_version = max(if_version, dev->if_version);
 310                 if (sv->drm_di_minor >= 1) {
 311                         /*
 312                          * Version 1.1 includes tying of DRM to specific device
 313                          * Version 1.4 has proper PCI domain support
 314                          */
 315                         retcode = drm_set_busid(dev, file_priv);
 316                         if (retcode)
 317                                 goto done;
 318                 }
 319         }
 320
 321         if (sv->drm_dd_major != -1) {
 322                 if (sv->drm_dd_major != dev->driver->major ||
 323                     sv->drm_dd_minor < 0 || sv->drm_dd_minor >
 324                     dev->driver->minor) {
 325                         retcode = -EINVAL;
 326                         goto done;
 327                 }
 328
 329                 if (dev->driver->set_version)
 330                         dev->driver->set_version(dev, sv);
 331         }
 332
 333 done:
 334         sv->drm_di_major = DRM_IF_MAJOR;
 335         sv->drm_di_minor = DRM_IF_MINOR;
 336         sv->drm_dd_major = dev->driver->major;
 337         sv->drm_dd_minor = dev->driver->minor;
 338
 339         return retcode;
 340 }
 341
 342 /** No-op ioctl. */
 343 int drm_noop(struct drm_device *dev, void *data,
 344              struct drm_file *file_priv)
 345 {
 346         DRM_DEBUG("\n");
 347         return 0;
 348 }