drivers/char/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 filp file pointer.
  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 inode *inode, struct file *filp,
  53                   unsigned int cmd, unsigned long arg)
  54 {
  55         struct drm_file *priv = filp->private_data;
  56         struct drm_device *dev = priv->head->dev;
  57         struct drm_unique __user *argp = (void __user *)arg;
  58         struct drm_unique u;
  59
  60         if (copy_from_user(&u, argp, sizeof(u)))
  61                 return -EFAULT;
  62         if (u.unique_len >= dev->unique_len) {
  63                 if (copy_to_user(u.unique, dev->unique, dev->unique_len))
  64                         return -EFAULT;
  65         }
  66         u.unique_len = dev->unique_len;
  67         if (copy_to_user(argp, &u, sizeof(u)))
  68                 return -EFAULT;
  69         return 0;
  70 }
  71
  72 /**
  73  * Set the bus id.
  74  *
  75  * \param inode device inode.
  76  * \param filp file pointer.
  77  * \param cmd command.
  78  * \param arg user argument, pointing to a drm_unique structure.
  79  * \return zero on success or a negative number on failure.
  80  *
  81  * Copies the bus id from userspace into drm_device::unique, and verifies that
  82  * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
  83  * in interface version 1.1 and will return EBUSY when setversion has requested
  84  * version 1.1 or greater.
  85  */
  86 int drm_setunique(struct inode *inode, struct file *filp,
  87                   unsigned int cmd, unsigned long arg)
  88 {
  89         struct drm_file *priv = filp->private_data;
  90         struct drm_device *dev = priv->head->dev;
  91         struct drm_unique u;
  92         int domain, bus, slot, func, ret;
  93
  94         if (dev->unique_len || dev->unique)
  95                 return -EBUSY;
  96
  97         if (copy_from_user(&u, (struct drm_unique __user *) arg, sizeof(u)))
  98                 return -EFAULT;
  99
 100         if (!u.unique_len || u.unique_len > 1024)
 101                 return -EINVAL;
 102
 103         dev->unique_len = u.unique_len;
 104         dev->unique = drm_alloc(u.unique_len + 1, DRM_MEM_DRIVER);
 105         if (!dev->unique)
 106                 return -ENOMEM;
 107         if (copy_from_user(dev->unique, u.unique, dev->unique_len))
 108                 return -EFAULT;
 109
 110         dev->unique[dev->unique_len] = '\0';
 111
 112         dev->devname =
 113             drm_alloc(strlen(dev->driver->pci_driver.name) +
 114                       strlen(dev->unique) + 2, DRM_MEM_DRIVER);
 115         if (!dev->devname)
 116                 return -ENOMEM;
 117
 118         sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
 119                 dev->unique);
 120
 121         /* Return error if the busid submitted doesn't match the device's actual
 122          * busid.
 123          */
 124         ret = sscanf(dev->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
 125         if (ret != 3)
 126                 return DRM_ERR(EINVAL);
 127         domain = bus >> 8;
 128         bus &= 0xff;
 129
 130         if ((domain != drm_get_pci_domain(dev)) ||
 131             (bus != dev->pdev->bus->number) ||
 132             (slot != PCI_SLOT(dev->pdev->devfn)) ||
 133             (func != PCI_FUNC(dev->pdev->devfn)))
 134                 return -EINVAL;
 135
 136         return 0;
 137 }
 138
 139 static int drm_set_busid(struct drm_device * dev)
 140 {
 141         int len;
 142
 143         if (dev->unique != NULL)
 144                 return 0;
 145
 146         dev->unique_len = 40;
 147         dev->unique = drm_alloc(dev->unique_len + 1, DRM_MEM_DRIVER);
 148         if (dev->unique == NULL)
 149                 return -ENOMEM;
 150
 151         len = snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d",
 152                        drm_get_pci_domain(dev), dev->pdev->bus->number,
 153                        PCI_SLOT(dev->pdev->devfn),
 154                        PCI_FUNC(dev->pdev->devfn));
 155
 156         if (len > dev->unique_len)
 157                 DRM_ERROR("Unique buffer overflowed\n");
 158
 159         dev->devname =
 160             drm_alloc(strlen(dev->driver->pci_driver.name) + dev->unique_len +
 161                       2, DRM_MEM_DRIVER);
 162         if (dev->devname == NULL)
 163                 return -ENOMEM;
 164
 165         sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
 166                 dev->unique);
 167
 168         return 0;
 169 }
 170
 171 /**
 172  * Get a mapping information.
 173  *
 174  * \param inode device inode.
 175  * \param filp file pointer.
 176  * \param cmd command.
 177  * \param arg user argument, pointing to a drm_map structure.
 178  *
 179  * \return zero on success or a negative number on failure.
 180  *
 181  * Searches for the mapping with the specified offset and copies its information
 182  * into userspace
 183  */
 184 int drm_getmap(struct inode *inode, struct file *filp,
 185                unsigned int cmd, unsigned long arg)
 186 {
 187         struct drm_file *priv = filp->private_data;
 188         struct drm_device *dev = priv->head->dev;
 189         struct drm_map __user *argp = (void __user *)arg;
 190         struct drm_map map;
 191         drm_map_list_t *r_list = NULL;
 192         struct list_head *list;
 193         int idx;
 194         int i;
 195
 196         if (copy_from_user(&map, argp, sizeof(map)))
 197                 return -EFAULT;
 198         idx = map.offset;
 199
 200         mutex_lock(&dev->struct_mutex);
 201         if (idx < 0) {
 202                 mutex_unlock(&dev->struct_mutex);
 203                 return -EINVAL;
 204         }
 205
 206         i = 0;
 207         list_for_each(list, &dev->maplist) {
 208                 if (i == idx) {
 209                         r_list = list_entry(list, drm_map_list_t, head);
 210                         break;
 211                 }
 212                 i++;
 213         }
 214         if (!r_list || !r_list->map) {
 215                 mutex_unlock(&dev->struct_mutex);
 216                 return -EINVAL;
 217         }
 218
 219         map.offset = r_list->map->offset;
 220         map.size = r_list->map->size;
 221         map.type = r_list->map->type;
 222         map.flags = r_list->map->flags;
 223         map.handle = (void *)(unsigned long)r_list->user_token;
 224         map.mtrr = r_list->map->mtrr;
 225         mutex_unlock(&dev->struct_mutex);
 226
 227         if (copy_to_user(argp, &map, sizeof(map)))
 228                 return -EFAULT;
 229         return 0;
 230 }
 231
 232 /**
 233  * Get client information.
 234  *
 235  * \param inode device inode.
 236  * \param filp file pointer.
 237  * \param cmd command.
 238  * \param arg user argument, pointing to a drm_client structure.
 239  *
 240  * \return zero on success or a negative number on failure.
 241  *
 242  * Searches for the client with the specified index and copies its information
 243  * into userspace
 244  */
 245 int drm_getclient(struct inode *inode, struct file *filp,
 246                   unsigned int cmd, unsigned long arg)
 247 {
 248         struct drm_file *priv = filp->private_data;
 249         struct drm_device *dev = priv->head->dev;
 250         struct drm_client __user *argp = (struct drm_client __user *)arg;
 251         struct drm_client client;
 252         struct drm_file *pt;
 253         int idx;
 254         int i;
 255
 256         if (copy_from_user(&client, argp, sizeof(client)))
 257                 return -EFAULT;
 258         idx = client.idx;
 259         mutex_lock(&dev->struct_mutex);
 260
 261         if (list_empty(&dev->filelist)) {
 262                 mutex_unlock(&dev->struct_mutex);
 263                 return -EINVAL;
 264         }
 265
 266         i = 0;
 267         list_for_each_entry(pt, &dev->filelist, lhead) {
 268                 if (i++ >= idx)
 269                         break;
 270         }
 271
 272         client.auth = pt->authenticated;
 273         client.pid = pt->pid;
 274         client.uid = pt->uid;
 275         client.magic = pt->magic;
 276         client.iocs = pt->ioctl_count;
 277         mutex_unlock(&dev->struct_mutex);
 278
 279         if (copy_to_user(argp, &client, sizeof(client)))
 280                 return -EFAULT;
 281         return 0;
 282 }
 283
 284 /**
 285  * Get statistics information.
 286  *
 287  * \param inode device inode.
 288  * \param filp file pointer.
 289  * \param cmd command.
 290  * \param arg user argument, pointing to a drm_stats structure.
 291  *
 292  * \return zero on success or a negative number on failure.
 293  */
 294 int drm_getstats(struct inode *inode, struct file *filp,
 295                  unsigned int cmd, unsigned long arg)
 296 {
 297         struct drm_file *priv = filp->private_data;
 298         struct drm_device *dev = priv->head->dev;
 299         struct drm_stats stats;
 300         int i;
 301
 302         memset(&stats, 0, sizeof(stats));
 303
 304         mutex_lock(&dev->struct_mutex);
 305
 306         for (i = 0; i < dev->counters; i++) {
 307                 if (dev->types[i] == _DRM_STAT_LOCK)
 308                         stats.data[i].value
 309                             = (dev->lock.hw_lock ? dev->lock.hw_lock->lock : 0);
 310                 else
 311                         stats.data[i].value = atomic_read(&dev->counts[i]);
 312                 stats.data[i].type = dev->types[i];
 313         }
 314
 315         stats.count = dev->counters;
 316
 317         mutex_unlock(&dev->struct_mutex);
 318
 319         if (copy_to_user((struct drm_stats __user *) arg, &stats, sizeof(stats)))
 320                 return -EFAULT;
 321         return 0;
 322 }
 323
 324 /**
 325  * Setversion ioctl.
 326  *
 327  * \param inode device inode.
 328  * \param filp file pointer.
 329  * \param cmd command.
 330  * \param arg user argument, pointing to a drm_lock structure.
 331  * \return zero on success or negative number on failure.
 332  *
 333  * Sets the requested interface version
 334  */
 335 int drm_setversion(DRM_IOCTL_ARGS)
 336 {
 337         DRM_DEVICE;
 338         struct drm_set_version sv;
 339         struct drm_set_version retv;
 340         int if_version;
 341         struct drm_set_version __user *argp = (void __user *)data;
 342         int ret;
 343
 344         if (copy_from_user(&sv, argp, sizeof(sv)))
 345                 return -EFAULT;
 346
 347         retv.drm_di_major = DRM_IF_MAJOR;
 348         retv.drm_di_minor = DRM_IF_MINOR;
 349         retv.drm_dd_major = dev->driver->major;
 350         retv.drm_dd_minor = dev->driver->minor;
 351
 352         if (copy_to_user(argp, &retv, sizeof(retv)))
 353                 return -EFAULT;
 354
 355         if (sv.drm_di_major != -1) {
 356                 if (sv.drm_di_major != DRM_IF_MAJOR ||
 357                     sv.drm_di_minor < 0 || sv.drm_di_minor > DRM_IF_MINOR)
 358                         return -EINVAL;
 359                 if_version = DRM_IF_VERSION(sv.drm_di_major, sv.drm_di_minor);
 360                 dev->if_version = max(if_version, dev->if_version);
 361                 if (sv.drm_di_minor >= 1) {
 362                         /*
 363                          * Version 1.1 includes tying of DRM to specific device
 364                          */
 365                         ret = drm_set_busid(dev);
 366                         if (ret)
 367                                 return ret;
 368                 }
 369         }
 370
 371         if (sv.drm_dd_major != -1) {
 372                 if (sv.drm_dd_major != dev->driver->major ||
 373                     sv.drm_dd_minor < 0
 374                     || sv.drm_dd_minor > dev->driver->minor)
 375                         return -EINVAL;
 376
 377                 if (dev->driver->set_version)
 378                         dev->driver->set_version(dev, &sv);
 379         }
 380         return 0;
 381 }
 382
 383 /** No-op ioctl. */
 384 int drm_noop(struct inode *inode, struct file *filp, unsigned int cmd,
 385              unsigned long arg)
 386 {
 387         DRM_DEBUG("\n");
 388         return 0;
 389 }