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         drm_file_t *priv = filp->private_data;
  56         drm_device_t *dev = priv->head->dev;
  57         drm_unique_t __user *argp = (void __user *)arg;
  58         drm_unique_t 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         drm_file_t *priv = filp->private_data;
  90         drm_device_t *dev = priv->head->dev;
  91         drm_unique_t 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, (drm_unique_t __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(drm_device_t * 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         drm_file_t *priv = filp->private_data;
 188         drm_device_t *dev = priv->head->dev;
 189         drm_map_t __user *argp = (void __user *)arg;
 190         drm_map_t 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->head) {
 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         drm_file_t *priv = filp->private_data;
 249         drm_device_t *dev = priv->head->dev;
 250         drm_client_t __user *argp = (drm_client_t __user *)arg;
 251         drm_client_t client;
 252         drm_file_t *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         for (i = 0, pt = dev->file_first; i < idx && pt; i++, pt = pt->next) ;
 261
 262         if (!pt) {
 263                 mutex_unlock(&dev->struct_mutex);
 264                 return -EINVAL;
 265         }
 266         client.auth = pt->authenticated;
 267         client.pid = pt->pid;
 268         client.uid = pt->uid;
 269         client.magic = pt->magic;
 270         client.iocs = pt->ioctl_count;
 271         mutex_unlock(&dev->struct_mutex);
 272
 273         if (copy_to_user(argp, &client, sizeof(client)))
 274                 return -EFAULT;
 275         return 0;
 276 }
 277
 278 /**
 279  * Get statistics information.
 280  *
 281  * \param inode device inode.
 282  * \param filp file pointer.
 283  * \param cmd command.
 284  * \param arg user argument, pointing to a drm_stats structure.
 285  *
 286  * \return zero on success or a negative number on failure.
 287  */
 288 int drm_getstats(struct inode *inode, struct file *filp,
 289                  unsigned int cmd, unsigned long arg)
 290 {
 291         drm_file_t *priv = filp->private_data;
 292         drm_device_t *dev = priv->head->dev;
 293         drm_stats_t stats;
 294         int i;
 295
 296         memset(&stats, 0, sizeof(stats));
 297
 298         mutex_lock(&dev->struct_mutex);
 299
 300         for (i = 0; i < dev->counters; i++) {
 301                 if (dev->types[i] == _DRM_STAT_LOCK)
 302                         stats.data[i].value
 303                             = (dev->lock.hw_lock ? dev->lock.hw_lock->lock : 0);
 304                 else
 305                         stats.data[i].value = atomic_read(&dev->counts[i]);
 306                 stats.data[i].type = dev->types[i];
 307         }
 308
 309         stats.count = dev->counters;
 310
 311         mutex_unlock(&dev->struct_mutex);
 312
 313         if (copy_to_user((drm_stats_t __user *) arg, &stats, sizeof(stats)))
 314                 return -EFAULT;
 315         return 0;
 316 }
 317
 318 /**
 319  * Setversion ioctl.
 320  *
 321  * \param inode device inode.
 322  * \param filp file pointer.
 323  * \param cmd command.
 324  * \param arg user argument, pointing to a drm_lock structure.
 325  * \return zero on success or negative number on failure.
 326  *
 327  * Sets the requested interface version
 328  */
 329 int drm_setversion(DRM_IOCTL_ARGS)
 330 {
 331         DRM_DEVICE;
 332         drm_set_version_t sv;
 333         drm_set_version_t retv;
 334         int if_version;
 335         drm_set_version_t __user *argp = (void __user *)data;
 336         int ret;
 337
 338         if (copy_from_user(&sv, argp, sizeof(sv)))
 339                 return -EFAULT;
 340
 341         retv.drm_di_major = DRM_IF_MAJOR;
 342         retv.drm_di_minor = DRM_IF_MINOR;
 343         retv.drm_dd_major = dev->driver->major;
 344         retv.drm_dd_minor = dev->driver->minor;
 345
 346         if (copy_to_user(argp, &retv, sizeof(retv)))
 347                 return -EFAULT;
 348
 349         if (sv.drm_di_major != -1) {
 350                 if (sv.drm_di_major != DRM_IF_MAJOR ||
 351                     sv.drm_di_minor < 0 || sv.drm_di_minor > DRM_IF_MINOR)
 352                         return -EINVAL;
 353                 if_version = DRM_IF_VERSION(sv.drm_di_major, sv.drm_di_minor);
 354                 dev->if_version = max(if_version, dev->if_version);
 355                 if (sv.drm_di_minor >= 1) {
 356                         /*
 357                          * Version 1.1 includes tying of DRM to specific device
 358                          */
 359                         ret = drm_set_busid(dev);
 360                         if (ret)
 361                                 return ret;
 362                 }
 363         }
 364
 365         if (sv.drm_dd_major != -1) {
 366                 if (sv.drm_dd_major != dev->driver->major ||
 367                     sv.drm_dd_minor < 0
 368                     || sv.drm_dd_minor > dev->driver->minor)
 369                         return -EINVAL;
 370
 371                 if (dev->driver->set_version)
 372                         dev->driver->set_version(dev, &sv);
 373         }
 374         return 0;
 375 }
 376
 377 /** No-op ioctl. */
 378 int drm_noop(struct inode *inode, struct file *filp, unsigned int cmd,
 379              unsigned long arg)
 380 {
 381         DRM_DEBUG("\n");
 382         return 0;
 383 }