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 != dev->pci_domain) ||
 131             (bus != dev->pci_bus) ||
 132             (slot != dev->pci_slot) || (func != dev->pci_func))
 133                 return -EINVAL;
 134
 135         return 0;
 136 }
 137
 138 static int drm_set_busid(drm_device_t * dev)
 139 {
 140         int len;
 141
 142         if (dev->unique != NULL)
 143                 return EBUSY;
 144
 145         dev->unique_len = 40;
 146         dev->unique = drm_alloc(dev->unique_len + 1, DRM_MEM_DRIVER);
 147         if (dev->unique == NULL)
 148                 return ENOMEM;
 149
 150         len = snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d",
 151                  dev->pci_domain, dev->pci_bus, dev->pci_slot, dev->pci_func);
 152
 153         if (len > dev->unique_len)
 154                 DRM_ERROR("Unique buffer overflowed\n");
 155
 156         dev->devname =
 157             drm_alloc(strlen(dev->driver->pci_driver.name) + dev->unique_len +
 158                       2, DRM_MEM_DRIVER);
 159         if (dev->devname == NULL)
 160                 return ENOMEM;
 161
 162         sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
 163                 dev->unique);
 164
 165         return 0;
 166 }
 167
 168 /**
 169  * Get a mapping information.
 170  *
 171  * \param inode device inode.
 172  * \param filp file pointer.
 173  * \param cmd command.
 174  * \param arg user argument, pointing to a drm_map structure.
 175  *
 176  * \return zero on success or a negative number on failure.
 177  *
 178  * Searches for the mapping with the specified offset and copies its information
 179  * into userspace
 180  */
 181 int drm_getmap(struct inode *inode, struct file *filp,
 182                unsigned int cmd, unsigned long arg)
 183 {
 184         drm_file_t *priv = filp->private_data;
 185         drm_device_t *dev = priv->head->dev;
 186         drm_map_t __user *argp = (void __user *)arg;
 187         drm_map_t map;
 188         drm_map_list_t *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         down(&dev->struct_sem);
 198         if (idx < 0) {
 199                 up(&dev->struct_sem);
 200                 return -EINVAL;
 201         }
 202
 203         i = 0;
 204         list_for_each(list, &dev->maplist->head) {
 205                 if (i == idx) {
 206                         r_list = list_entry(list, drm_map_list_t, head);
 207                         break;
 208                 }
 209                 i++;
 210         }
 211         if (!r_list || !r_list->map) {
 212                 up(&dev->struct_sem);
 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         up(&dev->struct_sem);
 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 filp file pointer.
 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 file *filp,
 243                   unsigned int cmd, unsigned long arg)
 244 {
 245         drm_file_t *priv = filp->private_data;
 246         drm_device_t *dev = priv->head->dev;
 247         drm_client_t __user *argp = (drm_client_t __user *)arg;
 248         drm_client_t client;
 249         drm_file_t *pt;
 250         int idx;
 251         int i;
 252
 253         if (copy_from_user(&client, argp, sizeof(client)))
 254                 return -EFAULT;
 255         idx = client.idx;
 256         down(&dev->struct_sem);
 257         for (i = 0, pt = dev->file_first; i < idx && pt; i++, pt = pt->next) ;
 258
 259         if (!pt) {
 260                 up(&dev->struct_sem);
 261                 return -EINVAL;
 262         }
 263         client.auth = pt->authenticated;
 264         client.pid = pt->pid;
 265         client.uid = pt->uid;
 266         client.magic = pt->magic;
 267         client.iocs = pt->ioctl_count;
 268         up(&dev->struct_sem);
 269
 270         if (copy_to_user(argp, &client, sizeof(client)))
 271                 return -EFAULT;
 272         return 0;
 273 }
 274
 275 /**
 276  * Get statistics information.
 277  *
 278  * \param inode device inode.
 279  * \param filp file pointer.
 280  * \param cmd command.
 281  * \param arg user argument, pointing to a drm_stats structure.
 282  *
 283  * \return zero on success or a negative number on failure.
 284  */
 285 int drm_getstats(struct inode *inode, struct file *filp,
 286                  unsigned int cmd, unsigned long arg)
 287 {
 288         drm_file_t *priv = filp->private_data;
 289         drm_device_t *dev = priv->head->dev;
 290         drm_stats_t stats;
 291         int i;
 292
 293         memset(&stats, 0, sizeof(stats));
 294
 295         down(&dev->struct_sem);
 296
 297         for (i = 0; i < dev->counters; i++) {
 298                 if (dev->types[i] == _DRM_STAT_LOCK)
 299                         stats.data[i].value
 300                             = (dev->lock.hw_lock ? dev->lock.hw_lock->lock : 0);
 301                 else
 302                         stats.data[i].value = atomic_read(&dev->counts[i]);
 303                 stats.data[i].type = dev->types[i];
 304         }
 305
 306         stats.count = dev->counters;
 307
 308         up(&dev->struct_sem);
 309
 310         if (copy_to_user((drm_stats_t __user *) arg, &stats, sizeof(stats)))
 311                 return -EFAULT;
 312         return 0;
 313 }
 314
 315 /**
 316  * Setversion ioctl.
 317  *
 318  * \param inode device inode.
 319  * \param filp file pointer.
 320  * \param cmd command.
 321  * \param arg user argument, pointing to a drm_lock structure.
 322  * \return zero on success or negative number on failure.
 323  *
 324  * Sets the requested interface version
 325  */
 326 int drm_setversion(DRM_IOCTL_ARGS)
 327 {
 328         DRM_DEVICE;
 329         drm_set_version_t sv;
 330         drm_set_version_t retv;
 331         int if_version;
 332         drm_set_version_t __user *argp = (void __user *)data;
 333
 334         DRM_COPY_FROM_USER_IOCTL(sv, argp, sizeof(sv));
 335
 336         retv.drm_di_major = DRM_IF_MAJOR;
 337         retv.drm_di_minor = DRM_IF_MINOR;
 338         retv.drm_dd_major = dev->driver->major;
 339         retv.drm_dd_minor = dev->driver->minor;
 340
 341         DRM_COPY_TO_USER_IOCTL(argp, retv, sizeof(sv));
 342
 343         if (sv.drm_di_major != -1) {
 344                 if (sv.drm_di_major != DRM_IF_MAJOR ||
 345                     sv.drm_di_minor < 0 || sv.drm_di_minor > DRM_IF_MINOR)
 346                         return EINVAL;
 347                 if_version = DRM_IF_VERSION(sv.drm_di_major, sv.drm_di_minor);
 348                 dev->if_version = DRM_MAX(if_version, dev->if_version);
 349                 if (sv.drm_di_minor >= 1) {
 350                         /*
 351                          * Version 1.1 includes tying of DRM to specific device
 352                          */
 353                         drm_set_busid(dev);
 354                 }
 355         }
 356
 357         if (sv.drm_dd_major != -1) {
 358                 if (sv.drm_dd_major != dev->driver->major ||
 359                     sv.drm_dd_minor < 0
 360                     || sv.drm_dd_minor > dev->driver->minor)
 361                         return EINVAL;
 362
 363                 if (dev->driver->set_version)
 364                         dev->driver->set_version(dev, &sv);
 365         }
 366         return 0;
 367 }
 368
 369 /** No-op ioctl. */
 370 int drm_noop(struct inode *inode, struct file *filp, unsigned int cmd,
 371              unsigned long arg)
 372 {
 373         DRM_DEBUG("\n");
 374         return 0;
 375 }