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