sys/dev/drm/drm_ioctl.c

   1 /*
   2  * Created: Fri Jan  8 09:01:26 1999 by faith@valinux.com
   3  *
   4  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
   5  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   6  * All Rights Reserved.
   7  *
   8  * Author Rickard E. (Rik) Faith <faith@valinux.com>
   9  * Author Gareth Hughes <gareth@valinux.com>
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice (including the next
  19  * paragraph) shall be included in all copies or substantial portions of the
  20  * Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  26  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  27  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  28  * OTHER DEALINGS IN THE SOFTWARE.
  29  */
  30
  31 #include <sys/devfs.h>
  32
  33 #include <drm/drmP.h>
  34 #include <drm/drm_core.h>
  35 #include "drm_legacy.h"
  36
  37 #include <linux/export.h>
  38
  39 static int drm_version(struct drm_device *dev, void *data,
  40                        struct drm_file *file_priv);
  41
  42 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \
  43         [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}
  44
  45 /** Ioctl table */
  46 static const struct drm_ioctl_desc drm_ioctls[] = {
  47         DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED),
  48         DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
  49         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
  50         DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
  51         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED),
  52         DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
  53         DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
  54         DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED),
  55         DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
  56
  57         DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  58         DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  59         DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  60         DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
  61
  62         DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  63         DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
  64
  65         DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  66         DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
  67
  68         DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
  69         DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
  70
  71         DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
  72         DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  73         DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  74         DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
  75         DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  76         DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  77         DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
  78
  79         DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  80         DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  81
  82         DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
  83         DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
  84
  85         DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
  86
  87         DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  88         DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  89         DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
  90         DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
  91         DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
  92         DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_dma, DRM_AUTH),
  93
  94         DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  95
  96         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  97         DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  98         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  99         DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
 100         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 101         DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 102         DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 103         DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 104
 105         DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 106         DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 107
 108         DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
 109
 110         DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
 111
 112         DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 113
 114         DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED),
 115         DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
 116         DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
 117
 118         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 119
 120 #if 0
 121         DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED),
 122         DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED),
 123 #endif
 124
 125         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 126         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 127         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 128         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 129         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 130         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 131         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
 132         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
 133         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 134         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 135         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 136         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 137         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 138         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 139         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 140         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 141         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 142         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 143         DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 144         DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 145         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 146         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 147         DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 148         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 149         DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 150         DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 151         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 152 };
 153
 154 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
 155
 156 /**
 157  * Get the bus id.
 158  *
 159  * \param inode device inode.
 160  * \param file_priv DRM file private.
 161  * \param cmd command.
 162  * \param arg user argument, pointing to a drm_unique structure.
 163  * \return zero on success or a negative number on failure.
 164  *
 165  * Copies the bus id from drm_device::unique into user space.
 166  */
 167 int drm_getunique(struct drm_device *dev, void *data,
 168                   struct drm_file *file_priv)
 169 {
 170         struct drm_unique *u = data;
 171
 172         if (u->unique_len >= dev->unique_len) {
 173                 if (copy_to_user(u->unique, dev->unique, dev->unique_len))
 174                         return EFAULT;
 175         }
 176         u->unique_len = dev->unique_len;
 177
 178         return 0;
 179 }
 180
 181 /**
 182  * Set the bus id.
 183  *
 184  * \param inode device inode.
 185  * \param file_priv DRM file private.
 186  * \param cmd command.
 187  * \param arg user argument, pointing to a drm_unique structure.
 188  * \return zero on success or a negative number on failure.
 189  *
 190  * Copies the bus id from userspace into drm_device::unique, and verifies that
 191  * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
 192  * in interface version 1.1 and will return EBUSY when setversion has requested
 193  * version 1.1 or greater.
 194  */
 195 int drm_setunique(struct drm_device *dev, void *data,
 196                   struct drm_file *file_priv)
 197 {
 198         struct drm_unique *u = data;
 199         int domain, bus, slot, func, ret;
 200         char *busid;
 201
 202         /* Check and copy in the submitted Bus ID */
 203         if (!u->unique_len || u->unique_len > 1024)
 204                 return EINVAL;
 205
 206         busid = kmalloc(u->unique_len + 1, M_DRM, M_WAITOK);
 207         if (busid == NULL)
 208                 return ENOMEM;
 209
 210         if (copy_from_user(busid, u->unique, u->unique_len)) {
 211                 drm_free(busid, M_DRM);
 212                 return EFAULT;
 213         }
 214         busid[u->unique_len] = '\0';
 215
 216         /* Return error if the busid submitted doesn't match the device's actual
 217          * busid.
 218          */
 219         ret = ksscanf(busid, "PCI:%d:%d:%d", &bus, &slot, &func);
 220         if (ret != 3) {
 221                 drm_free(busid, M_DRM);
 222                 return EINVAL;
 223         }
 224         domain = bus >> 8;
 225         bus &= 0xff;
 226
 227         if ((domain != dev->pci_domain) ||
 228             (bus != dev->pci_bus) ||
 229             (slot != dev->pci_slot) ||
 230             (func != dev->pci_func)) {
 231                 drm_free(busid, M_DRM);
 232                 return EINVAL;
 233         }
 234
 235         /* Actually set the device's busid now. */
 236         DRM_LOCK(dev);
 237         if (dev->unique_len || dev->unique) {
 238                 DRM_UNLOCK(dev);
 239                 return EBUSY;
 240         }
 241
 242         dev->unique_len = u->unique_len;
 243         dev->unique = busid;
 244         DRM_UNLOCK(dev);
 245
 246         return 0;
 247 }
 248
 249 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 250 {
 251
 252         DRM_LOCK(dev);
 253
 254         dev->unique_len = 20;
 255         dev->unique = kmalloc(dev->unique_len + 1, M_DRM, M_WAITOK | M_NULLOK);
 256         if (dev->unique == NULL) {
 257                 DRM_UNLOCK(dev);
 258                 return ENOMEM;
 259         }
 260
 261         ksnprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%1x",
 262             dev->pci_domain, dev->pci_bus, dev->pci_slot, dev->pci_func);
 263
 264         DRM_UNLOCK(dev);
 265
 266         return 0;
 267 }
 268
 269 /**
 270  * Get a mapping information.
 271  *
 272  * \param inode device inode.
 273  * \param file_priv DRM file private.
 274  * \param cmd command.
 275  * \param arg user argument, pointing to a drm_map structure.
 276  *
 277  * \return zero on success or a negative number on failure.
 278  *
 279  * Searches for the mapping with the specified offset and copies its information
 280  * into userspace
 281  */
 282 int drm_getmap(struct drm_device *dev, void *data,
 283                struct drm_file *file_priv)
 284 {
 285         struct drm_map *map = data;
 286         struct drm_map_list *r_list = NULL;
 287         struct list_head *list;
 288         int idx;
 289         int i;
 290
 291         idx = map->offset;
 292         if (idx < 0) {
 293                 return EINVAL;
 294         }
 295
 296         i = 0;
 297         DRM_LOCK(dev);
 298         list_for_each(list, &dev->maplist) {
 299                 if (i == idx) {
 300                         r_list = list_entry(list, struct drm_map_list, head);
 301                         break;
 302                 }
 303                 i++;
 304         }
 305         if (!r_list || !r_list->map) {
 306                 DRM_UNLOCK(dev);
 307                 return -EINVAL;
 308         }
 309
 310         map->offset = r_list->map->offset;
 311         map->size = r_list->map->size;
 312         map->type = r_list->map->type;
 313         map->flags = r_list->map->flags;
 314         map->handle = r_list->map->handle;
 315         map->mtrr   = r_list->map->mtrr;
 316         DRM_UNLOCK(dev);
 317
 318         return 0;
 319 }
 320
 321 /**
 322  * Get client information.
 323  *
 324  * \param inode device inode.
 325  * \param file_priv DRM file private.
 326  * \param cmd command.
 327  * \param arg user argument, pointing to a drm_client structure.
 328  *
 329  * \return zero on success or a negative number on failure.
 330  *
 331  * Searches for the client with the specified index and copies its information
 332  * into userspace
 333  */
 334 int drm_getclient(struct drm_device *dev, void *data,
 335                   struct drm_file *file_priv)
 336 {
 337         struct drm_client *client = data;
 338         struct drm_file *pt;
 339         int idx;
 340         int i = 0;
 341
 342         idx = client->idx;
 343         DRM_LOCK(dev);
 344         list_for_each_entry(pt, &dev->filelist, lhead) {
 345                 if (i++ >= idx) {
 346                         client->auth  = pt->authenticated;
 347                         client->pid   = pt->pid;
 348                         client->uid   = pt->uid;
 349                         client->magic = pt->magic;
 350                         client->iocs  = pt->ioctl_count;
 351                         DRM_UNLOCK(dev);
 352
 353                         return 0;
 354                 }
 355         }
 356         DRM_UNLOCK(dev);
 357
 358         return EINVAL;
 359 }
 360
 361 /**
 362  * Get statistics information.
 363  *
 364  * \param inode device inode.
 365  * \param file_priv DRM file private.
 366  * \param cmd command.
 367  * \param arg user argument, pointing to a drm_stats structure.
 368  *
 369  * \return zero on success or a negative number on failure.
 370  */
 371 int drm_getstats(struct drm_device *dev, void *data, struct drm_file *file_priv)
 372 {
 373         struct drm_stats *stats = data;
 374         int          i;
 375
 376         memset(stats, 0, sizeof(struct drm_stats));
 377
 378         DRM_LOCK(dev);
 379
 380         for (i = 0; i < dev->counters; i++) {
 381                 if (dev->types[i] == _DRM_STAT_LOCK)
 382                         stats->data[i].value =
 383                             (dev->lock.hw_lock ? dev->lock.hw_lock->lock : 0);
 384                 else
 385                         stats->data[i].value = atomic_read(&dev->counts[i]);
 386                 stats->data[i].type = dev->types[i];
 387         }
 388
 389         stats->count = dev->counters;
 390
 391         DRM_UNLOCK(dev);
 392
 393         return 0;
 394 }
 395
 396 /**
 397  * Get device/driver capabilities
 398  */
 399 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 400 {
 401         struct drm_get_cap *req = data;
 402
 403         req->value = 0;
 404         switch (req->capability) {
 405         case DRM_CAP_DUMB_BUFFER:
 406                 if (dev->driver->dumb_create)
 407                         req->value = 1;
 408                 break;
 409         case DRM_CAP_VBLANK_HIGH_CRTC:
 410                 req->value = 1;
 411                 break;
 412         case DRM_CAP_DUMB_PREFERRED_DEPTH:
 413                 req->value = dev->mode_config.preferred_depth;
 414                 break;
 415         case DRM_CAP_DUMB_PREFER_SHADOW:
 416                 req->value = dev->mode_config.prefer_shadow;
 417                 break;
 418         case DRM_CAP_TIMESTAMP_MONOTONIC:
 419                 req->value = drm_timestamp_monotonic;
 420                 break;
 421         default:
 422                 return EINVAL;
 423         }
 424         return 0;
 425 }
 426
 427 /**
 428  * Set device/driver capabilities
 429  */
 430 int
 431 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 432 {
 433         struct drm_set_client_cap *req = data;
 434
 435         switch (req->capability) {
 436         case DRM_CLIENT_CAP_STEREO_3D:
 437                 if (req->value > 1)
 438                         return -EINVAL;
 439                 file_priv->stereo_allowed = req->value;
 440                 break;
 441         case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
 442                 if (req->value > 1)
 443                         return -EINVAL;
 444                 file_priv->universal_planes = req->value;
 445                 break;
 446         default:
 447                 return -EINVAL;
 448         }
 449
 450         return 0;
 451 }
 452
 453 /**
 454  * Setversion ioctl.
 455  *
 456  * \param inode device inode.
 457  * \param file_priv DRM file private.
 458  * \param cmd command.
 459  * \param arg user argument, pointing to a drm_lock structure.
 460  * \return zero on success or negative number on failure.
 461  *
 462  * Sets the requested interface version
 463  */
 464 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 465 {
 466         struct drm_set_version *sv = data;
 467         struct drm_set_version ver;
 468         int if_version, retcode = 0;
 469
 470         /* Save the incoming data, and set the response before continuing
 471          * any further.
 472          */
 473         ver = *sv;
 474         sv->drm_di_major = DRM_IF_MAJOR;
 475         sv->drm_di_minor = DRM_IF_MINOR;
 476         sv->drm_dd_major = dev->driver->major;
 477         sv->drm_dd_minor = dev->driver->minor;
 478
 479         if (ver.drm_di_major != -1) {
 480                 if (ver.drm_di_major != DRM_IF_MAJOR ||
 481                     ver.drm_di_minor < 0 || ver.drm_di_minor > DRM_IF_MINOR) {
 482                         return EINVAL;
 483                 }
 484                 if_version = DRM_IF_VERSION(ver.drm_di_major,
 485                     ver.drm_dd_minor);
 486                 dev->if_version = DRM_MAX(if_version, dev->if_version);
 487                 if (ver.drm_di_minor >= 1) {
 488                         /*
 489                          * Version 1.1 includes tying of DRM to specific device
 490                          * Version 1.4 has proper PCI domain support
 491                          */
 492                         retcode = drm_set_busid(dev, file_priv);
 493                         if (retcode)
 494                                 return retcode;
 495                 }
 496         }
 497
 498         if (ver.drm_dd_major != -1) {
 499                 if (ver.drm_dd_major != dev->driver->major ||
 500                     ver.drm_dd_minor < 0 ||
 501                     ver.drm_dd_minor > dev->driver->minor)
 502                 {
 503                         return EINVAL;
 504                 }
 505         }
 506
 507         return 0;
 508 }
 509
 510 /** No-op ioctl. */
 511 int drm_noop(struct drm_device *dev, void *data,
 512              struct drm_file *file_priv)
 513 {
 514         DRM_DEBUG("\n");
 515         return 0;
 516 }
 517 EXPORT_SYMBOL(drm_noop);
 518
 519 /**
 520  * Copy and IOCTL return string to user space
 521  */
 522 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
 523 {
 524         int len;
 525
 526         /* don't overflow userbuf */
 527         len = strlen(value);
 528         if (len > *buf_len)
 529                 len = *buf_len;
 530
 531         /* let userspace know exact length of driver value (which could be
 532          * larger than the userspace-supplied buffer) */
 533         *buf_len = strlen(value);
 534
 535         /* finally, try filling in the userbuf */
 536         if (len && buf)
 537                 if (copy_to_user(buf, value, len))
 538                         return -EFAULT;
 539         return 0;
 540 }
 541
 542 /**
 543  * Get version information
 544  *
 545  * \param inode device inode.
 546  * \param filp file pointer.
 547  * \param cmd command.
 548  * \param arg user argument, pointing to a drm_version structure.
 549  * \return zero on success or negative number on failure.
 550  *
 551  * Fills in the version information in \p arg.
 552  */
 553 static int drm_version(struct drm_device *dev, void *data,
 554                        struct drm_file *file_priv)
 555 {
 556         struct drm_version *version = data;
 557         int err;
 558
 559         version->version_major = dev->driver->major;
 560         version->version_minor = dev->driver->minor;
 561         version->version_patchlevel = dev->driver->patchlevel;
 562         err = drm_copy_field(version->name, &version->name_len,
 563                         dev->driver->name);
 564         if (!err)
 565                 err = drm_copy_field(version->date, &version->date_len,
 566                                 dev->driver->date);
 567         if (!err)
 568                 err = drm_copy_field(version->desc, &version->desc_len,
 569                                 dev->driver->desc);
 570
 571         return err;
 572 }
 573
 574 /**
 575  * drm_ioctl_permit - Check ioctl permissions against caller
 576  *
 577  * @flags: ioctl permission flags.
 578  * @file_priv: Pointer to struct drm_file identifying the caller.
 579  *
 580  * Checks whether the caller is allowed to run an ioctl with the
 581  * indicated permissions. If so, returns zero. Otherwise returns an
 582  * error code suitable for ioctl return.
 583  */
 584 #if 0
 585 static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
 586 {
 587         /* ROOT_ONLY is only for CAP_SYS_ADMIN */
 588         if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
 589                 return -EACCES;
 590
 591         /* AUTH is only for authenticated or render client */
 592         if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
 593                      !file_priv->authenticated))
 594                 return -EACCES;
 595
 596         /* MASTER is only for master or control clients */
 597         if (unlikely((flags & DRM_MASTER) && !file_priv->is_master &&
 598                      !drm_is_control_client(file_priv)))
 599                 return -EACCES;
 600
 601         /* Control clients must be explicitly allowed */
 602         if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
 603                      drm_is_control_client(file_priv)))
 604                 return -EACCES;
 605
 606         /* Render clients must be explicitly allowed */
 607         if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
 608                      drm_is_render_client(file_priv)))
 609                 return -EACCES;
 610
 611         return 0;
 612 }
 613 #endif
 614
 615 /**
 616  * Called whenever a process performs an ioctl on /dev/drm.
 617  *
 618  * \param inode device inode.
 619  * \param file_priv DRM file private.
 620  * \param cmd command.
 621  * \param arg user argument.
 622  * \return zero on success or negative number on failure.
 623  *
 624  * Looks up the ioctl function in the ::ioctls table, checking for root
 625  * previleges if so required, and dispatches to the respective function.
 626  */
 627 int drm_ioctl(struct dev_ioctl_args *ap)
 628 {
 629         struct cdev *kdev = ap->a_head.a_dev;
 630         struct drm_device *dev;
 631         const struct drm_ioctl_desc *ioctl = NULL;
 632         u_long cmd = ap->a_cmd;
 633         unsigned int nr = DRM_IOCTL_NR(cmd);
 634         int retcode = 0;
 635         caddr_t data = ap->a_data;
 636         int (*func)(struct drm_device *dev, void *data, struct drm_file *file_priv);
 637         int is_driver_ioctl = 0;
 638         struct drm_file *file_priv;
 639
 640         dev = drm_get_device_from_kdev(kdev);
 641
 642         retcode = devfs_get_cdevpriv(ap->a_fp, (void **)&file_priv);
 643         if (retcode !=0) {
 644                 DRM_ERROR("can't find authenticator\n");
 645                 return EINVAL;
 646         }
 647
 648         atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
 649
 650         if (drm_device_is_unplugged(dev))
 651                 return -ENODEV;
 652
 653         if (IOCGROUP(cmd) != DRM_IOCTL_BASE) {
 654                 DRM_DEBUG("Bad ioctl group 0x%x\n", (int)IOCGROUP(cmd));
 655                 return EINVAL;
 656         }
 657
 658         ioctl = &drm_ioctls[nr];
 659         /* It's not a core DRM ioctl, try driver-specific. */
 660         if (ioctl->func == NULL && nr >= DRM_COMMAND_BASE) {
 661                 /* The array entries begin at DRM_COMMAND_BASE ioctl nr */
 662                 nr -= DRM_COMMAND_BASE;
 663                 if (nr >= dev->driver->num_ioctls) {
 664                         return EINVAL;
 665                 }
 666                 ioctl = &dev->driver->ioctls[nr];
 667                 is_driver_ioctl = 1;
 668         }
 669
 670         DRM_DEBUG_VERBOSE("pid=%d, cmd=0x%02lx, nr=0x%02x, dev 0x%lx, auth=%d\n",
 671             DRM_CURRENTPID, cmd, nr, (long)dev->dev,
 672             file_priv->authenticated);
 673
 674         /* Do not trust userspace, use our own definition */
 675         func = ioctl->func;
 676
 677         if (func == NULL) {
 678                 DRM_DEBUG("no function\n");
 679                 return EINVAL;
 680         }
 681
 682         if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
 683             ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
 684             ((ioctl->flags & DRM_MASTER) && !file_priv->master))
 685                 return EACCES;
 686
 687         if (is_driver_ioctl) {
 688                 if ((ioctl->flags & DRM_UNLOCKED) == 0)
 689                         mutex_lock(&drm_global_mutex);
 690                 /* shared code returns -errno */
 691                 retcode = -func(dev, data, file_priv);
 692                 if ((ioctl->flags & DRM_UNLOCKED) == 0)
 693                         mutex_unlock(&drm_global_mutex);
 694         } else {
 695                 retcode = func(dev, data, file_priv);
 696         }
 697
 698         if (!ioctl)
 699                 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02lx, nr=0x%02x\n",
 700                           DRM_CURRENTPID,
 701                           (long)dev->dev,
 702                           file_priv->authenticated, cmd, nr);
 703
 704         if (retcode)
 705                 DRM_DEBUG("ret = %d\n", retcode);
 706         return retcode;
 707 }
 708
 709 /**
 710  * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
 711  *
 712  * @nr: Ioctl number.
 713  * @flags: Where to return the ioctl permission flags
 714  */
 715 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
 716 {
 717         if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) ||
 718             (nr < DRM_COMMAND_BASE)) {
 719                 *flags = drm_ioctls[nr].flags;
 720                 return true;
 721         }
 722
 723         return false;
 724 }
 725 EXPORT_SYMBOL(drm_ioctl_flags);