drivers/gpu/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 <drm/drmP.h>
  32 #include <drm/drm_core.h>
  33 #include "drm_legacy.h"
  34
  35 #include <linux/pci.h>
  36 #include <linux/export.h>
  37 #ifdef CONFIG_X86
  38 #include <asm/mtrr.h>
  39 #endif
  40
  41 static int drm_version(struct drm_device *dev, void *data,
  42                        struct drm_file *file_priv);
  43
  44 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \
  45         [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}
  46
  47 /** Ioctl table */
  48 static const struct drm_ioctl_desc drm_ioctls[] = {
  49         DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED|DRM_RENDER_ALLOW),
  50         DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
  51         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
  52         DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
  53         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED),
  54         DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
  55         DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
  56         DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),
  57         DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
  58         DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
  59
  60         DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  61         DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  62         DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  63         DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
  64
  65         DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  66         DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
  67
  68         DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  69         DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
  70
  71         DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
  72         DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
  73
  74         DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
  75         DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  76         DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  77         DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
  78         DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  79         DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  80         DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
  81
  82         DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  83         DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  84
  85         DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
  86         DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
  87
  88         DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
  89
  90         DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  91         DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  92         DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
  93         DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
  94         DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
  95         DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
  96
  97         DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  98
  99 #if __OS_HAS_AGP
 100         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 101         DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 102         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 103         DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
 104         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 105         DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 106         DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 107         DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 108 #endif
 109
 110         DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 111         DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 112
 113         DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
 114
 115         DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
 116
 117         DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 118
 119         DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
 120         DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
 121         DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
 122
 123         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 124
 125         DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
 126         DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
 127
 128         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 129         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 130         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 131         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 132         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 133         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 134         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
 135         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
 136         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 137         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 138         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 139         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 140         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 141         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 142         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 143         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 144         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 145         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 146         DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 147         DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 148         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 149         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 150         DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 151         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 152         DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 153         DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 154         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 155 };
 156
 157 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
 158
 159 /**
 160  * Get the bus id.
 161  *
 162  * \param inode device inode.
 163  * \param file_priv DRM file private.
 164  * \param cmd command.
 165  * \param arg user argument, pointing to a drm_unique structure.
 166  * \return zero on success or a negative number on failure.
 167  *
 168  * Copies the bus id from drm_device::unique into user space.
 169  */
 170 int drm_getunique(struct drm_device *dev, void *data,
 171                   struct drm_file *file_priv)
 172 {
 173         struct drm_unique *u = data;
 174         struct drm_master *master = file_priv->master;
 175
 176         if (u->unique_len >= master->unique_len) {
 177                 if (copy_to_user(u->unique, master->unique, master->unique_len))
 178                         return -EFAULT;
 179         }
 180         u->unique_len = master->unique_len;
 181
 182         return 0;
 183 }
 184
 185 static void
 186 drm_unset_busid(struct drm_device *dev,
 187                 struct drm_master *master)
 188 {
 189         kfree(master->unique);
 190         master->unique = NULL;
 191         master->unique_len = 0;
 192 }
 193
 194 /**
 195  * Set the bus id.
 196  *
 197  * \param inode device inode.
 198  * \param file_priv DRM file private.
 199  * \param cmd command.
 200  * \param arg user argument, pointing to a drm_unique structure.
 201  * \return zero on success or a negative number on failure.
 202  *
 203  * Copies the bus id from userspace into drm_device::unique, and verifies that
 204  * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
 205  * in interface version 1.1 and will return EBUSY when setversion has requested
 206  * version 1.1 or greater. Also note that KMS is all version 1.1 and later and
 207  * UMS was only ever supported on pci devices.
 208  */
 209 int drm_setunique(struct drm_device *dev, void *data,
 210                   struct drm_file *file_priv)
 211 {
 212         struct drm_unique *u = data;
 213         struct drm_master *master = file_priv->master;
 214         int ret;
 215
 216         if (master->unique_len || master->unique)
 217                 return -EBUSY;
 218
 219         if (!u->unique_len || u->unique_len > 1024)
 220                 return -EINVAL;
 221
 222         if (drm_core_check_feature(dev, DRIVER_MODESET))
 223                 return 0;
 224
 225         if (WARN_ON(!dev->pdev))
 226                 return -EINVAL;
 227
 228         ret = drm_pci_set_unique(dev, master, u);
 229         if (ret)
 230                 goto err;
 231
 232         return 0;
 233
 234 err:
 235         drm_unset_busid(dev, master);
 236         return ret;
 237 }
 238
 239 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 240 {
 241         struct drm_master *master = file_priv->master;
 242         int ret;
 243
 244         if (master->unique != NULL)
 245                 drm_unset_busid(dev, master);
 246
 247         if (dev->driver->set_busid) {
 248                 ret = dev->driver->set_busid(dev, master);
 249                 if (ret) {
 250                         drm_unset_busid(dev, master);
 251                         return ret;
 252                 }
 253         } else {
 254                 if (WARN(dev->unique == NULL,
 255                          "No drm_driver.set_busid() implementation provided by "
 256                          "%ps. Use drm_dev_set_unique() to set the unique "
 257                          "name explicitly.", dev->driver))
 258                         return -EINVAL;
 259
 260                 master->unique = kstrdup(dev->unique, GFP_KERNEL);
 261                 if (master->unique)
 262                         master->unique_len = strlen(dev->unique);
 263         }
 264
 265         return 0;
 266 }
 267
 268 /**
 269  * Get a mapping information.
 270  *
 271  * \param inode device inode.
 272  * \param file_priv DRM file private.
 273  * \param cmd command.
 274  * \param arg user argument, pointing to a drm_map structure.
 275  *
 276  * \return zero on success or a negative number on failure.
 277  *
 278  * Searches for the mapping with the specified offset and copies its information
 279  * into userspace
 280  */
 281 int drm_getmap(struct drm_device *dev, void *data,
 282                struct drm_file *file_priv)
 283 {
 284         struct drm_map *map = data;
 285         struct drm_map_list *r_list = NULL;
 286         struct list_head *list;
 287         int idx;
 288         int i;
 289
 290         idx = map->offset;
 291         if (idx < 0)
 292                 return -EINVAL;
 293
 294         i = 0;
 295         mutex_lock(&dev->struct_mutex);
 296         list_for_each(list, &dev->maplist) {
 297                 if (i == idx) {
 298                         r_list = list_entry(list, struct drm_map_list, head);
 299                         break;
 300                 }
 301                 i++;
 302         }
 303         if (!r_list || !r_list->map) {
 304                 mutex_unlock(&dev->struct_mutex);
 305                 return -EINVAL;
 306         }
 307
 308         map->offset = r_list->map->offset;
 309         map->size = r_list->map->size;
 310         map->type = r_list->map->type;
 311         map->flags = r_list->map->flags;
 312         map->handle = (void *)(unsigned long) r_list->user_token;
 313
 314 #ifdef CONFIG_X86
 315         /*
 316          * There appears to be exactly one user of the mtrr index: dritest.
 317          * It's easy enough to keep it working on non-PAT systems.
 318          */
 319         map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
 320 #else
 321         map->mtrr = -1;
 322 #endif
 323
 324         mutex_unlock(&dev->struct_mutex);
 325
 326         return 0;
 327 }
 328
 329 /**
 330  * Get client information.
 331  *
 332  * \param inode device inode.
 333  * \param file_priv DRM file private.
 334  * \param cmd command.
 335  * \param arg user argument, pointing to a drm_client structure.
 336  *
 337  * \return zero on success or a negative number on failure.
 338  *
 339  * Searches for the client with the specified index and copies its information
 340  * into userspace
 341  */
 342 int drm_getclient(struct drm_device *dev, void *data,
 343                   struct drm_file *file_priv)
 344 {
 345         struct drm_client *client = data;
 346
 347         /*
 348          * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
 349          * not breaking completely. Userspace tools stop enumerating one they
 350          * get -EINVAL, hence this is the return value we need to hand back for
 351          * no clients tracked.
 352          *
 353          * Unfortunately some clients (*cough* libva *cough*) use this in a fun
 354          * attempt to figure out whether they're authenticated or not. Since
 355          * that's the only thing they care about, give it to the directly
 356          * instead of walking one giant list.
 357          */
 358         if (client->idx == 0) {
 359                 client->auth = file_priv->authenticated;
 360                 client->pid = pid_vnr(file_priv->pid);
 361                 client->uid = from_kuid_munged(current_user_ns(),
 362                                                file_priv->uid);
 363                 client->magic = 0;
 364                 client->iocs = 0;
 365
 366                 return 0;
 367         } else {
 368                 return -EINVAL;
 369         }
 370 }
 371
 372 /**
 373  * Get statistics information.
 374  *
 375  * \param inode device inode.
 376  * \param file_priv DRM file private.
 377  * \param cmd command.
 378  * \param arg user argument, pointing to a drm_stats structure.
 379  *
 380  * \return zero on success or a negative number on failure.
 381  */
 382 int drm_getstats(struct drm_device *dev, void *data,
 383                  struct drm_file *file_priv)
 384 {
 385         struct drm_stats *stats = data;
 386
 387         /* Clear stats to prevent userspace from eating its stack garbage. */
 388         memset(stats, 0, sizeof(*stats));
 389
 390         return 0;
 391 }
 392
 393 /**
 394  * Get device/driver capabilities
 395  */
 396 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 397 {
 398         struct drm_get_cap *req = data;
 399
 400         req->value = 0;
 401         switch (req->capability) {
 402         case DRM_CAP_DUMB_BUFFER:
 403                 if (dev->driver->dumb_create)
 404                         req->value = 1;
 405                 break;
 406         case DRM_CAP_VBLANK_HIGH_CRTC:
 407                 req->value = 1;
 408                 break;
 409         case DRM_CAP_DUMB_PREFERRED_DEPTH:
 410                 req->value = dev->mode_config.preferred_depth;
 411                 break;
 412         case DRM_CAP_DUMB_PREFER_SHADOW:
 413                 req->value = dev->mode_config.prefer_shadow;
 414                 break;
 415         case DRM_CAP_PRIME:
 416                 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
 417                 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
 418                 break;
 419         case DRM_CAP_TIMESTAMP_MONOTONIC:
 420                 req->value = drm_timestamp_monotonic;
 421                 break;
 422         case DRM_CAP_ASYNC_PAGE_FLIP:
 423                 req->value = dev->mode_config.async_page_flip;
 424                 break;
 425         case DRM_CAP_CURSOR_WIDTH:
 426                 if (dev->mode_config.cursor_width)
 427                         req->value = dev->mode_config.cursor_width;
 428                 else
 429                         req->value = 64;
 430                 break;
 431         case DRM_CAP_CURSOR_HEIGHT:
 432                 if (dev->mode_config.cursor_height)
 433                         req->value = dev->mode_config.cursor_height;
 434                 else
 435                         req->value = 64;
 436                 break;
 437         default:
 438                 return -EINVAL;
 439         }
 440         return 0;
 441 }
 442
 443 /**
 444  * Set device/driver capabilities
 445  */
 446 int
 447 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 448 {
 449         struct drm_set_client_cap *req = data;
 450
 451         switch (req->capability) {
 452         case DRM_CLIENT_CAP_STEREO_3D:
 453                 if (req->value > 1)
 454                         return -EINVAL;
 455                 file_priv->stereo_allowed = req->value;
 456                 break;
 457         case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
 458                 if (req->value > 1)
 459                         return -EINVAL;
 460                 file_priv->universal_planes = req->value;
 461                 break;
 462         default:
 463                 return -EINVAL;
 464         }
 465
 466         return 0;
 467 }
 468
 469 /**
 470  * Setversion ioctl.
 471  *
 472  * \param inode device inode.
 473  * \param file_priv DRM file private.
 474  * \param cmd command.
 475  * \param arg user argument, pointing to a drm_lock structure.
 476  * \return zero on success or negative number on failure.
 477  *
 478  * Sets the requested interface version
 479  */
 480 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 481 {
 482         struct drm_set_version *sv = data;
 483         int if_version, retcode = 0;
 484
 485         if (sv->drm_di_major != -1) {
 486                 if (sv->drm_di_major != DRM_IF_MAJOR ||
 487                     sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
 488                         retcode = -EINVAL;
 489                         goto done;
 490                 }
 491                 if_version = DRM_IF_VERSION(sv->drm_di_major,
 492                                             sv->drm_di_minor);
 493                 dev->if_version = max(if_version, dev->if_version);
 494                 if (sv->drm_di_minor >= 1) {
 495                         /*
 496                          * Version 1.1 includes tying of DRM to specific device
 497                          * Version 1.4 has proper PCI domain support
 498                          */
 499                         retcode = drm_set_busid(dev, file_priv);
 500                         if (retcode)
 501                                 goto done;
 502                 }
 503         }
 504
 505         if (sv->drm_dd_major != -1) {
 506                 if (sv->drm_dd_major != dev->driver->major ||
 507                     sv->drm_dd_minor < 0 || sv->drm_dd_minor >
 508                     dev->driver->minor) {
 509                         retcode = -EINVAL;
 510                         goto done;
 511                 }
 512         }
 513
 514 done:
 515         sv->drm_di_major = DRM_IF_MAJOR;
 516         sv->drm_di_minor = DRM_IF_MINOR;
 517         sv->drm_dd_major = dev->driver->major;
 518         sv->drm_dd_minor = dev->driver->minor;
 519
 520         return retcode;
 521 }
 522
 523 /** No-op ioctl. */
 524 int drm_noop(struct drm_device *dev, void *data,
 525              struct drm_file *file_priv)
 526 {
 527         DRM_DEBUG("\n");
 528         return 0;
 529 }
 530 EXPORT_SYMBOL(drm_noop);
 531
 532 /**
 533  * Copy and IOCTL return string to user space
 534  */
 535 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
 536 {
 537         int len;
 538
 539         /* don't overflow userbuf */
 540         len = strlen(value);
 541         if (len > *buf_len)
 542                 len = *buf_len;
 543
 544         /* let userspace know exact length of driver value (which could be
 545          * larger than the userspace-supplied buffer) */
 546         *buf_len = strlen(value);
 547
 548         /* finally, try filling in the userbuf */
 549         if (len && buf)
 550                 if (copy_to_user(buf, value, len))
 551                         return -EFAULT;
 552         return 0;
 553 }
 554
 555 /**
 556  * Get version information
 557  *
 558  * \param inode device inode.
 559  * \param filp file pointer.
 560  * \param cmd command.
 561  * \param arg user argument, pointing to a drm_version structure.
 562  * \return zero on success or negative number on failure.
 563  *
 564  * Fills in the version information in \p arg.
 565  */
 566 static int drm_version(struct drm_device *dev, void *data,
 567                        struct drm_file *file_priv)
 568 {
 569         struct drm_version *version = data;
 570         int err;
 571
 572         version->version_major = dev->driver->major;
 573         version->version_minor = dev->driver->minor;
 574         version->version_patchlevel = dev->driver->patchlevel;
 575         err = drm_copy_field(version->name, &version->name_len,
 576                         dev->driver->name);
 577         if (!err)
 578                 err = drm_copy_field(version->date, &version->date_len,
 579                                 dev->driver->date);
 580         if (!err)
 581                 err = drm_copy_field(version->desc, &version->desc_len,
 582                                 dev->driver->desc);
 583
 584         return err;
 585 }
 586
 587 /**
 588  * drm_ioctl_permit - Check ioctl permissions against caller
 589  *
 590  * @flags: ioctl permission flags.
 591  * @file_priv: Pointer to struct drm_file identifying the caller.
 592  *
 593  * Checks whether the caller is allowed to run an ioctl with the
 594  * indicated permissions. If so, returns zero. Otherwise returns an
 595  * error code suitable for ioctl return.
 596  */
 597 static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
 598 {
 599         /* ROOT_ONLY is only for CAP_SYS_ADMIN */
 600         if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
 601                 return -EACCES;
 602
 603         /* AUTH is only for authenticated or render client */
 604         if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
 605                      !file_priv->authenticated))
 606                 return -EACCES;
 607
 608         /* MASTER is only for master or control clients */
 609         if (unlikely((flags & DRM_MASTER) && !file_priv->is_master &&
 610                      !drm_is_control_client(file_priv)))
 611                 return -EACCES;
 612
 613         /* Control clients must be explicitly allowed */
 614         if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
 615                      drm_is_control_client(file_priv)))
 616                 return -EACCES;
 617
 618         /* Render clients must be explicitly allowed */
 619         if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
 620                      drm_is_render_client(file_priv)))
 621                 return -EACCES;
 622
 623         return 0;
 624 }
 625
 626 /**
 627  * Called whenever a process performs an ioctl on /dev/drm.
 628  *
 629  * \param inode device inode.
 630  * \param file_priv DRM file private.
 631  * \param cmd command.
 632  * \param arg user argument.
 633  * \return zero on success or negative number on failure.
 634  *
 635  * Looks up the ioctl function in the ::ioctls table, checking for root
 636  * previleges if so required, and dispatches to the respective function.
 637  */
 638 long drm_ioctl(struct file *filp,
 639               unsigned int cmd, unsigned long arg)
 640 {
 641         struct drm_file *file_priv = filp->private_data;
 642         struct drm_device *dev;
 643         const struct drm_ioctl_desc *ioctl = NULL;
 644         drm_ioctl_t *func;
 645         unsigned int nr = DRM_IOCTL_NR(cmd);
 646         int retcode = -EINVAL;
 647         char stack_kdata[128];
 648         char *kdata = NULL;
 649         unsigned int usize, asize;
 650
 651         dev = file_priv->minor->dev;
 652
 653         if (drm_device_is_unplugged(dev))
 654                 return -ENODEV;
 655
 656         if ((nr >= DRM_CORE_IOCTL_COUNT) &&
 657             ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
 658                 goto err_i1;
 659         if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
 660             (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
 661                 u32 drv_size;
 662                 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
 663                 drv_size = _IOC_SIZE(ioctl->cmd_drv);
 664                 usize = asize = _IOC_SIZE(cmd);
 665                 if (drv_size > asize)
 666                         asize = drv_size;
 667                 cmd = ioctl->cmd_drv;
 668         }
 669         else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
 670                 u32 drv_size;
 671
 672                 ioctl = &drm_ioctls[nr];
 673
 674                 drv_size = _IOC_SIZE(ioctl->cmd);
 675                 usize = asize = _IOC_SIZE(cmd);
 676                 if (drv_size > asize)
 677                         asize = drv_size;
 678
 679                 cmd = ioctl->cmd;
 680         } else
 681                 goto err_i1;
 682
 683         DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
 684                   task_pid_nr(current),
 685                   (long)old_encode_dev(file_priv->minor->kdev->devt),
 686                   file_priv->authenticated, ioctl->name);
 687
 688         /* Do not trust userspace, use our own definition */
 689         func = ioctl->func;
 690
 691         if (unlikely(!func)) {
 692                 DRM_DEBUG("no function\n");
 693                 retcode = -EINVAL;
 694                 goto err_i1;
 695         }
 696
 697         retcode = drm_ioctl_permit(ioctl->flags, file_priv);
 698         if (unlikely(retcode))
 699                 goto err_i1;
 700
 701         if (cmd & (IOC_IN | IOC_OUT)) {
 702                 if (asize <= sizeof(stack_kdata)) {
 703                         kdata = stack_kdata;
 704                 } else {
 705                         kdata = kmalloc(asize, GFP_KERNEL);
 706                         if (!kdata) {
 707                                 retcode = -ENOMEM;
 708                                 goto err_i1;
 709                         }
 710                 }
 711                 if (asize > usize)
 712                         memset(kdata + usize, 0, asize - usize);
 713         }
 714
 715         if (cmd & IOC_IN) {
 716                 if (copy_from_user(kdata, (void __user *)arg,
 717                                    usize) != 0) {
 718                         retcode = -EFAULT;
 719                         goto err_i1;
 720                 }
 721         } else if (cmd & IOC_OUT) {
 722                 memset(kdata, 0, usize);
 723         }
 724
 725         if (ioctl->flags & DRM_UNLOCKED)
 726                 retcode = func(dev, kdata, file_priv);
 727         else {
 728                 mutex_lock(&drm_global_mutex);
 729                 retcode = func(dev, kdata, file_priv);
 730                 mutex_unlock(&drm_global_mutex);
 731         }
 732
 733         if (cmd & IOC_OUT) {
 734                 if (copy_to_user((void __user *)arg, kdata,
 735                                  usize) != 0)
 736                         retcode = -EFAULT;
 737         }
 738
 739       err_i1:
 740         if (!ioctl)
 741                 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
 742                           task_pid_nr(current),
 743                           (long)old_encode_dev(file_priv->minor->kdev->devt),
 744                           file_priv->authenticated, cmd, nr);
 745
 746         if (kdata != stack_kdata)
 747                 kfree(kdata);
 748         if (retcode)
 749                 DRM_DEBUG("ret = %d\n", retcode);
 750         return retcode;
 751 }
 752 EXPORT_SYMBOL(drm_ioctl);
 753
 754 /**
 755  * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
 756  *
 757  * @nr: Ioctl number.
 758  * @flags: Where to return the ioctl permission flags
 759  */
 760 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
 761 {
 762         if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) ||
 763             (nr < DRM_COMMAND_BASE)) {
 764                 *flags = drm_ioctls[nr].flags;
 765                 return true;
 766         }
 767
 768         return false;
 769 }
 770 EXPORT_SYMBOL(drm_ioctl_flags);