sys/dev/drm/drm_bufs.c

   1 /*
   2  * Legacy: Generic DRM Buffer Management
   3  *
   4  * Copyright 1999, 2000 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 <linux/vmalloc.h>
  32 #include <linux/slab.h>
  33 #include <linux/log2.h>
  34 #include <linux/export.h>
  35 #include <asm/shmparam.h>
  36 #include <drm/drmP.h>
  37 #include "drm_legacy.h"
  38
  39 #include <sys/conf.h>
  40 #include <sys/mman.h>
  41 #include <vm/vm_map.h>
  42
  43 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  44                                                   struct drm_local_map *map)
  45 {
  46         struct drm_map_list *entry;
  47         list_for_each_entry(entry, &dev->maplist, head) {
  48                 /*
  49                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  50                  * while PCI resources may live above that, we only compare the
  51                  * lower 32 bits of the map offset for maps of type
  52                  * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  53                  * It is assumed that if a driver have more than one resource
  54                  * of each type, the lower 32 bits are different.
  55                  */
  56                 if (!entry->map ||
  57                     map->type != entry->map->type ||
  58                     entry->master != dev->master)
  59                         continue;
  60                 switch (map->type) {
  61                 case _DRM_SHM:
  62                         if (map->flags != _DRM_CONTAINS_LOCK)
  63                                 break;
  64                         return entry;
  65                 case _DRM_REGISTERS:
  66                 case _DRM_FRAME_BUFFER:
  67                         if ((entry->map->offset & 0xffffffff) ==
  68                             (map->offset & 0xffffffff))
  69                                 return entry;
  70                 default: /* Make gcc happy */
  71                         ;
  72                 }
  73                 if (entry->map->offset == map->offset)
  74                         return entry;
  75         }
  76
  77         return NULL;
  78 }
  79
  80 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  81                           unsigned long user_token, int hashed_handle, int shm)
  82 {
  83         int use_hashed_handle, shift;
  84         unsigned long add;
  85
  86 #if (BITS_PER_LONG == 64)
  87         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  88 #elif (BITS_PER_LONG == 32)
  89         use_hashed_handle = hashed_handle;
  90 #else
  91 #error Unsupported long size. Neither 64 nor 32 bits.
  92 #endif
  93
  94         if (!use_hashed_handle) {
  95                 int ret;
  96                 hash->key = user_token >> PAGE_SHIFT;
  97                 ret = drm_ht_insert_item(&dev->map_hash, hash);
  98                 if (ret != -EINVAL)
  99                         return ret;
 100         }
 101
 102         shift = 0;
 103         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 104         if (shm && (SHMLBA > PAGE_SIZE)) {
 105                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 106
 107                 /* For shared memory, we have to preserve the SHMLBA
 108                  * bits of the eventual vma->vm_pgoff value during
 109                  * mmap().  Otherwise we run into cache aliasing problems
 110                  * on some platforms.  On these platforms, the pgoff of
 111                  * a mmap() request is used to pick a suitable virtual
 112                  * address for the mmap() region such that it will not
 113                  * cause cache aliasing problems.
 114                  *
 115                  * Therefore, make sure the SHMLBA relevant bits of the
 116                  * hash value we use are equal to those in the original
 117                  * kernel virtual address.
 118                  */
 119                 shift = bits;
 120                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 121         }
 122
 123         return drm_ht_just_insert_please(&dev->map_hash, hash,
 124                                          user_token, 32 - PAGE_SHIFT - 3,
 125                                          shift, add);
 126 }
 127
 128 /**
 129  * Core function to create a range of memory available for mapping by a
 130  * non-root process.
 131  *
 132  * Adjusts the memory offset to its absolute value according to the mapping
 133  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 134  * applicable and if supported by the kernel.
 135  */
 136 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 137                            unsigned int size, enum drm_map_type type,
 138                            enum drm_map_flags flags,
 139                            struct drm_map_list ** maplist)
 140 {
 141         struct drm_local_map *map;
 142         struct drm_map_list *list;
 143         drm_dma_handle_t *dmah;
 144         unsigned long user_token;
 145         int ret;
 146
 147         map = kmalloc(sizeof(*map), M_DRM, GFP_KERNEL);
 148         if (!map)
 149                 return -ENOMEM;
 150
 151         map->offset = offset;
 152         map->size = size;
 153         map->flags = flags;
 154         map->type = type;
 155
 156         /* Only allow shared memory to be removable since we only keep enough
 157          * book keeping information about shared memory to allow for removal
 158          * when processes fork.
 159          */
 160         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 161                 kfree(map);
 162                 return -EINVAL;
 163         }
 164         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 165                   (unsigned long long)map->offset, map->size, map->type);
 166
 167         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 168          * hole created by that and it works around various broken drivers that use
 169          * a non-aligned quantity to map the SAREA. --BenH
 170          */
 171         if (map->type == _DRM_SHM)
 172                 map->size = PAGE_ALIGN(map->size);
 173
 174         if ((map->offset & (~(resource_size_t) LINUX_PAGE_MASK)) || (map->size & (~LINUX_PAGE_MASK))) {
 175                 kfree(map);
 176                 return -EINVAL;
 177         }
 178         map->mtrr = -1;
 179         map->handle = NULL;
 180
 181         switch (map->type) {
 182         case _DRM_REGISTERS:
 183         case _DRM_FRAME_BUFFER:
 184 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
 185                 if (map->offset + (map->size-1) < map->offset ||
 186                     map->offset < virt_to_phys(high_memory)) {
 187                         kfree(map);
 188                         return -EINVAL;
 189                 }
 190 #endif
 191                 /* Some drivers preinitialize some maps, without the X Server
 192                  * needing to be aware of it.  Therefore, we just return success
 193                  * when the server tries to create a duplicate map.
 194                  */
 195                 list = drm_find_matching_map(dev, map);
 196                 if (list != NULL) {
 197                         if (list->map->size != map->size) {
 198                                 DRM_DEBUG("Matching maps of type %d with "
 199                                           "mismatched sizes, (%ld vs %ld)\n",
 200                                           map->type, map->size,
 201                                           list->map->size);
 202                                 list->map->size = map->size;
 203                         }
 204
 205                         kfree(map);
 206                         *maplist = list;
 207                         return 0;
 208                 }
 209
 210                 if (map->type == _DRM_FRAME_BUFFER ||
 211                     (map->flags & _DRM_WRITE_COMBINING)) {
 212                         map->mtrr =
 213                                 arch_phys_wc_add(map->offset, map->size);
 214                 }
 215                 if (map->type == _DRM_REGISTERS) {
 216                         if (map->flags & _DRM_WRITE_COMBINING)
 217                                 map->handle = ioremap_wc(map->offset,
 218                                                          map->size);
 219                         else
 220                                 map->handle = ioremap(map->offset, map->size);
 221                         if (!map->handle) {
 222                                 kfree(map);
 223                                 return -ENOMEM;
 224                         }
 225                 }
 226
 227                 break;
 228         case _DRM_SHM:
 229                 list = drm_find_matching_map(dev, map);
 230                 if (list != NULL) {
 231                         if(list->map->size != map->size) {
 232                                 DRM_DEBUG("Matching maps of type %d with "
 233                                           "mismatched sizes, (%ld vs %ld)\n",
 234                                           map->type, map->size, list->map->size);
 235                                 list->map->size = map->size;
 236                         }
 237
 238                         kfree(map);
 239                         *maplist = list;
 240                         return 0;
 241                 }
 242                 map->handle = vmalloc_user(map->size);
 243                 DRM_DEBUG("%lu %d %p\n",
 244                           map->size, order_base_2(map->size), map->handle);
 245                 if (!map->handle) {
 246                         kfree(map);
 247                         return -ENOMEM;
 248                 }
 249                 map->offset = (unsigned long)map->handle;
 250                 if (map->flags & _DRM_CONTAINS_LOCK) {
 251                         /* Prevent a 2nd X Server from creating a 2nd lock */
 252                         if (dev->master->lock.hw_lock != NULL) {
 253                                 vfree(map->handle);
 254                                 kfree(map);
 255                                 return -EBUSY;
 256                         }
 257                         dev->sigdata.lock = dev->master->lock.hw_lock = map->handle;    /* Pointer to lock */
 258                 }
 259                 break;
 260         case _DRM_AGP: {
 261 #if 0
 262                 struct drm_agp_mem *entry;
 263                 int valid = 0;
 264
 265                 if (!dev->agp) {
 266                         kfree(map);
 267                         return -EINVAL;
 268                 }
 269 #ifdef __alpha__
 270                 map->offset += dev->hose->mem_space->start;
 271 #endif
 272                 /* In some cases (i810 driver), user space may have already
 273                  * added the AGP base itself, because dev->agp->base previously
 274                  * only got set during AGP enable.  So, only add the base
 275                  * address if the map's offset isn't already within the
 276                  * aperture.
 277                  */
 278                 if (map->offset < dev->agp->base ||
 279                     map->offset > dev->agp->base +
 280                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 281                         map->offset += dev->agp->base;
 282                 }
 283                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 284
 285                 /* This assumes the DRM is in total control of AGP space.
 286                  * It's not always the case as AGP can be in the control
 287                  * of user space (i.e. i810 driver). So this loop will get
 288                  * skipped and we double check that dev->agp->memory is
 289                  * actually set as well as being invalid before EPERM'ing
 290                  */
 291                 list_for_each_entry(entry, &dev->agp->memory, head) {
 292                         if ((map->offset >= entry->bound) &&
 293                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 294                                 valid = 1;
 295                                 break;
 296                         }
 297                 }
 298                 if (!list_empty(&dev->agp->memory) && !valid) {
 299                         kfree(map);
 300                         return -EPERM;
 301                 }
 302                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 303                           (unsigned long long)map->offset, map->size);
 304
 305                 break;
 306 #endif
 307                 return -EINVAL;         /* AGP hardware is no longer supported */
 308         }
 309         case _DRM_SCATTER_GATHER:
 310                 if (!dev->sg) {
 311                         kfree(map);
 312                         return -EINVAL;
 313                 }
 314                 map->handle = (void *)(uintptr_t)(dev->sg->vaddr + offset);
 315                 map->offset = dev->sg->vaddr + offset;
 316                 break;
 317         case _DRM_CONSISTENT:
 318                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 319                  * As we're limiting the address to 2^32-1 (or less),
 320                  * casting it down to 32 bits is no problem, but we
 321                  * need to point to a 64bit variable first. */
 322                 dmah = drm_pci_alloc(dev, map->size, map->size);
 323                 if (!dmah) {
 324                         kfree(map);
 325                         return -ENOMEM;
 326                 }
 327                 map->handle = dmah->vaddr;
 328                 map->offset = (unsigned long)dmah->busaddr;
 329                 kfree(dmah);
 330                 break;
 331         default:
 332                 kfree(map);
 333                 return -EINVAL;
 334         }
 335
 336         list = kzalloc(sizeof(*list), GFP_KERNEL);
 337         if (!list) {
 338                 if (map->type == _DRM_REGISTERS)
 339                         iounmap(map->handle);
 340                 kfree(map);
 341                 return -EINVAL;
 342         }
 343         list->map = map;
 344
 345         mutex_lock(&dev->struct_mutex);
 346         list_add(&list->head, &dev->maplist);
 347
 348         /* Assign a 32-bit handle */
 349         /* We do it here so that dev->struct_mutex protects the increment */
 350         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 351                 map->offset;
 352         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 353                              (map->type == _DRM_SHM));
 354         if (ret) {
 355                 if (map->type == _DRM_REGISTERS)
 356                         iounmap(map->handle);
 357                 kfree(map);
 358                 kfree(list);
 359                 mutex_unlock(&dev->struct_mutex);
 360                 return ret;
 361         }
 362
 363         list->user_token = list->hash.key << PAGE_SHIFT;
 364         mutex_unlock(&dev->struct_mutex);
 365
 366         if (!(map->flags & _DRM_DRIVER))
 367                 list->master = dev->master;
 368         *maplist = list;
 369         return 0;
 370 }
 371
 372 int drm_legacy_addmap(struct drm_device * dev, resource_size_t offset,
 373                       unsigned int size, enum drm_map_type type,
 374                       enum drm_map_flags flags, struct drm_local_map **map_ptr)
 375 {
 376         struct drm_map_list *list;
 377         int rc;
 378
 379         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 380         if (!rc)
 381                 *map_ptr = list->map;
 382         return rc;
 383 }
 384 EXPORT_SYMBOL(drm_legacy_addmap);
 385
 386 /**
 387  * Ioctl to specify a range of memory that is available for mapping by a
 388  * non-root process.
 389  *
 390  * \param inode device inode.
 391  * \param file_priv DRM file private.
 392  * \param cmd command.
 393  * \param arg pointer to a drm_map structure.
 394  * \return zero on success or a negative value on error.
 395  *
 396  */
 397 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
 398                             struct drm_file *file_priv)
 399 {
 400         struct drm_map *map = data;
 401         struct drm_map_list *maplist;
 402         int err;
 403
 404         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 405                 return -EPERM;
 406
 407         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 408             !drm_core_check_feature(dev, DRIVER_LEGACY))
 409                 return -EINVAL;
 410
 411         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 412                               map->flags, &maplist);
 413
 414         if (err)
 415                 return err;
 416
 417         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 418         map->handle = (void *)(unsigned long)maplist->user_token;
 419
 420         /*
 421          * It appears that there are no users of this value whatsoever --
 422          * drmAddMap just discards it.  Let's not encourage its use.
 423          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 424          *  it's not a real mtrr index anymore.)
 425          */
 426         map->mtrr = -1;
 427
 428         return 0;
 429 }
 430
 431 /*
 432  * Get a mapping information.
 433  *
 434  * \param inode device inode.
 435  * \param file_priv DRM file private.
 436  * \param cmd command.
 437  * \param arg user argument, pointing to a drm_map structure.
 438  *
 439  * \return zero on success or a negative number on failure.
 440  *
 441  * Searches for the mapping with the specified offset and copies its information
 442  * into userspace
 443  */
 444 int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
 445                             struct drm_file *file_priv)
 446 {
 447         struct drm_map *map = data;
 448         struct drm_map_list *r_list = NULL;
 449         struct list_head *list;
 450         int idx;
 451         int i;
 452
 453         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 454             !drm_core_check_feature(dev, DRIVER_LEGACY))
 455                 return -EINVAL;
 456
 457         idx = map->offset;
 458         if (idx < 0)
 459                 return -EINVAL;
 460
 461         i = 0;
 462         mutex_lock(&dev->struct_mutex);
 463         list_for_each(list, &dev->maplist) {
 464                 if (i == idx) {
 465                         r_list = list_entry(list, struct drm_map_list, head);
 466                         break;
 467                 }
 468                 i++;
 469         }
 470         if (!r_list || !r_list->map) {
 471                 mutex_unlock(&dev->struct_mutex);
 472                 return -EINVAL;
 473         }
 474
 475         map->offset = r_list->map->offset;
 476         map->size = r_list->map->size;
 477         map->type = r_list->map->type;
 478         map->flags = r_list->map->flags;
 479         map->handle = (void *)(unsigned long) r_list->user_token;
 480         map->mtrr = r_list->map->mtrr;
 481
 482         mutex_unlock(&dev->struct_mutex);
 483
 484         return 0;
 485 }
 486
 487 /**
 488  * Remove a map private from list and deallocate resources if the mapping
 489  * isn't in use.
 490  *
 491  * Searches the map on drm_device::maplist, removes it from the list, see if
 492  * its being used, and free any associate resource (such as MTRR's) if it's not
 493  * being on use.
 494  *
 495  * \sa drm_legacy_addmap
 496  */
 497 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 498 {
 499         struct drm_map_list *r_list = NULL, *list_t;
 500         drm_dma_handle_t dmah;
 501         int found = 0;
 502         struct drm_master *master;
 503
 504         /* Find the list entry for the map and remove it */
 505         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 506                 if (r_list->map == map) {
 507                         master = r_list->master;
 508                         list_del(&r_list->head);
 509                         drm_ht_remove_key(&dev->map_hash,
 510                                           r_list->user_token >> PAGE_SHIFT);
 511                         kfree(r_list);
 512                         found = 1;
 513                         break;
 514                 }
 515         }
 516
 517         if (!found)
 518                 return -EINVAL;
 519
 520         switch (map->type) {
 521         case _DRM_REGISTERS:
 522                 iounmap(map->handle);
 523                 /* FALLTHROUGH */
 524         case _DRM_FRAME_BUFFER:
 525                 arch_phys_wc_del(map->mtrr);
 526                 break;
 527         case _DRM_SHM:
 528                 vfree(map->handle);
 529                 if (master) {
 530                         if (dev->sigdata.lock == master->lock.hw_lock)
 531                                 dev->sigdata.lock = NULL;
 532                         master->lock.hw_lock = NULL;   /* SHM removed */
 533                         master->lock.file_priv = NULL;
 534                         wake_up_interruptible_all(&master->lock.lock_queue);
 535                 }
 536                 break;
 537         case _DRM_AGP:
 538         case _DRM_SCATTER_GATHER:
 539                 break;
 540         case _DRM_CONSISTENT:
 541                 dmah.vaddr = map->handle;
 542                 dmah.busaddr = map->offset;
 543                 dmah.size = map->size;
 544                 __drm_legacy_pci_free(dev, &dmah);
 545                 break;
 546         }
 547         kfree(map);
 548
 549         return 0;
 550 }
 551 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
 552
 553 void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
 554 {
 555         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 556             !drm_core_check_feature(dev, DRIVER_LEGACY))
 557                 return;
 558
 559         mutex_lock(&dev->struct_mutex);
 560         drm_legacy_rmmap_locked(dev, map);
 561         mutex_unlock(&dev->struct_mutex);
 562 }
 563 EXPORT_SYMBOL(drm_legacy_rmmap);
 564
 565 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
 566 {
 567         struct drm_map_list *r_list, *list_temp;
 568
 569         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 570                 return;
 571
 572         mutex_lock(&dev->struct_mutex);
 573         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 574                 if (r_list->master == master) {
 575                         drm_legacy_rmmap_locked(dev, r_list->map);
 576                         r_list = NULL;
 577                 }
 578         }
 579         mutex_unlock(&dev->struct_mutex);
 580 }
 581
 582 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 583  * the last close of the device, and this is necessary for cleanup when things
 584  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 585  * like a pointless exercise since they're going away anyway.
 586  *
 587  * One use case might be after addmap is allowed for normal users for SHM and
 588  * gets used by drivers that the server doesn't need to care about.  This seems
 589  * unlikely.
 590  *
 591  * \param inode device inode.
 592  * \param file_priv DRM file private.
 593  * \param cmd command.
 594  * \param arg pointer to a struct drm_map structure.
 595  * \return zero on success or a negative value on error.
 596  */
 597 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
 598                            struct drm_file *file_priv)
 599 {
 600         struct drm_map *request = data;
 601         struct drm_local_map *map = NULL;
 602         struct drm_map_list *r_list;
 603         int ret;
 604
 605         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 606             !drm_core_check_feature(dev, DRIVER_LEGACY))
 607                 return -EINVAL;
 608
 609         mutex_lock(&dev->struct_mutex);
 610         list_for_each_entry(r_list, &dev->maplist, head) {
 611                 if (r_list->map &&
 612                     r_list->user_token == (unsigned long)request->handle &&
 613                     r_list->map->flags & _DRM_REMOVABLE) {
 614                         map = r_list->map;
 615                         break;
 616                 }
 617         }
 618
 619         /* List has wrapped around to the head pointer, or its empty we didn't
 620          * find anything.
 621          */
 622         if (list_empty(&dev->maplist) || !map) {
 623                 mutex_unlock(&dev->struct_mutex);
 624                 return -EINVAL;
 625         }
 626
 627         /* Register and framebuffer maps are permanent */
 628         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 629                 mutex_unlock(&dev->struct_mutex);
 630                 return 0;
 631         }
 632
 633         ret = drm_legacy_rmmap_locked(dev, map);
 634
 635         mutex_unlock(&dev->struct_mutex);
 636
 637         return ret;
 638 }
 639
 640 /**
 641  * Cleanup after an error on one of the addbufs() functions.
 642  *
 643  * \param dev DRM device.
 644  * \param entry buffer entry where the error occurred.
 645  *
 646  * Frees any pages and buffers associated with the given entry.
 647  */
 648 static void drm_cleanup_buf_error(struct drm_device * dev,
 649                                   struct drm_buf_entry * entry)
 650 {
 651         int i;
 652
 653         if (entry->seg_count) {
 654                 for (i = 0; i < entry->seg_count; i++) {
 655                         if (entry->seglist[i]) {
 656                                 drm_pci_free(dev, entry->seglist[i]);
 657                         }
 658                 }
 659                 kfree(entry->seglist);
 660
 661                 entry->seg_count = 0;
 662         }
 663
 664         if (entry->buf_count) {
 665                 for (i = 0; i < entry->buf_count; i++) {
 666                         kfree(entry->buflist[i].dev_private);
 667                 }
 668                 kfree(entry->buflist);
 669
 670                 entry->buf_count = 0;
 671         }
 672 }
 673
 674 #if IS_ENABLED(CONFIG_AGP)
 675 /**
 676  * Add AGP buffers for DMA transfers.
 677  *
 678  * \param dev struct drm_device to which the buffers are to be added.
 679  * \param request pointer to a struct drm_buf_desc describing the request.
 680  * \return zero on success or a negative number on failure.
 681  *
 682  * After some sanity checks creates a drm_buf structure for each buffer and
 683  * reallocates the buffer list of the same size order to accommodate the new
 684  * buffers.
 685  */
 686 int drm_legacy_addbufs_agp(struct drm_device *dev,
 687                            struct drm_buf_desc *request)
 688 {
 689         struct drm_device_dma *dma = dev->dma;
 690         struct drm_buf_entry *entry;
 691         struct drm_agp_mem *agp_entry;
 692         struct drm_buf *buf;
 693         unsigned long offset;
 694         unsigned long agp_offset;
 695         int count;
 696         int order;
 697         int size;
 698         int alignment;
 699         int page_order;
 700         int total;
 701         int byte_count;
 702         int i, valid;
 703         struct drm_buf **temp_buflist;
 704
 705         if (!dma)
 706                 return -EINVAL;
 707
 708         count = request->count;
 709         order = order_base_2(request->size);
 710         size = 1 << order;
 711
 712         alignment = (request->flags & _DRM_PAGE_ALIGN)
 713             ? PAGE_ALIGN(size) : size;
 714         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 715         total = PAGE_SIZE << page_order;
 716
 717         byte_count = 0;
 718         agp_offset = dev->agp->base + request->agp_start;
 719
 720         DRM_DEBUG("count:      %d\n", count);
 721         DRM_DEBUG("order:      %d\n", order);
 722         DRM_DEBUG("size:       %d\n", size);
 723         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 724         DRM_DEBUG("alignment:  %d\n", alignment);
 725         DRM_DEBUG("page_order: %d\n", page_order);
 726         DRM_DEBUG("total:      %d\n", total);
 727
 728         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 729                 return -EINVAL;
 730
 731         /* Make sure buffers are located in AGP memory that we own */
 732         valid = 0;
 733         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 734                 if ((agp_offset >= agp_entry->bound) &&
 735                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 736                         valid = 1;
 737                         break;
 738                 }
 739         }
 740         if (!list_empty(&dev->agp->memory) && !valid) {
 741                 DRM_DEBUG("zone invalid\n");
 742                 return -EINVAL;
 743         }
 744         lockmgr(&dev->buf_lock, LK_EXCLUSIVE);
 745         if (dev->buf_use) {
 746                 lockmgr(&dev->buf_lock, LK_RELEASE);
 747                 return -EBUSY;
 748         }
 749         atomic_inc(&dev->buf_alloc);
 750         lockmgr(&dev->buf_lock, LK_RELEASE);
 751
 752         mutex_lock(&dev->struct_mutex);
 753         entry = &dma->bufs[order];
 754         if (entry->buf_count) {
 755                 mutex_unlock(&dev->struct_mutex);
 756                 atomic_dec(&dev->buf_alloc);
 757                 return -ENOMEM; /* May only call once for each order */
 758         }
 759
 760         if (count < 0 || count > 4096) {
 761                 mutex_unlock(&dev->struct_mutex);
 762                 atomic_dec(&dev->buf_alloc);
 763                 return -EINVAL;
 764         }
 765
 766         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 767         if (!entry->buflist) {
 768                 mutex_unlock(&dev->struct_mutex);
 769                 atomic_dec(&dev->buf_alloc);
 770                 return -ENOMEM;
 771         }
 772
 773         entry->buf_size = size;
 774         entry->page_order = page_order;
 775
 776         offset = 0;
 777
 778         while (entry->buf_count < count) {
 779                 buf = &entry->buflist[entry->buf_count];
 780                 buf->idx = dma->buf_count + entry->buf_count;
 781                 buf->total = alignment;
 782                 buf->order = order;
 783                 buf->used = 0;
 784
 785                 buf->offset = (dma->byte_count + offset);
 786                 buf->bus_address = agp_offset + offset;
 787                 buf->address = (void *)(agp_offset + offset);
 788                 buf->next = NULL;
 789                 buf->waiting = 0;
 790                 buf->pending = 0;
 791                 buf->file_priv = NULL;
 792
 793                 buf->dev_priv_size = dev->driver->dev_priv_size;
 794                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 795                 if (!buf->dev_private) {
 796                         /* Set count correctly so we free the proper amount. */
 797                         entry->buf_count = count;
 798                         drm_cleanup_buf_error(dev, entry);
 799                         mutex_unlock(&dev->struct_mutex);
 800                         atomic_dec(&dev->buf_alloc);
 801                         return -ENOMEM;
 802                 }
 803
 804                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 805
 806                 offset += alignment;
 807                 entry->buf_count++;
 808                 byte_count += PAGE_SIZE << page_order;
 809         }
 810
 811         DRM_DEBUG("byte_count: %d\n", byte_count);
 812
 813         temp_buflist = krealloc(dma->buflist,
 814                                 (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist),
 815                                 M_DRM, GFP_KERNEL);
 816         if (!temp_buflist) {
 817                 /* Free the entry because it isn't valid */
 818                 drm_cleanup_buf_error(dev, entry);
 819                 mutex_unlock(&dev->struct_mutex);
 820                 atomic_dec(&dev->buf_alloc);
 821                 return -ENOMEM;
 822         }
 823         dma->buflist = temp_buflist;
 824
 825         for (i = 0; i < entry->buf_count; i++) {
 826                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 827         }
 828
 829         dma->buf_count += entry->buf_count;
 830         dma->seg_count += entry->seg_count;
 831         dma->page_count += byte_count >> PAGE_SHIFT;
 832         dma->byte_count += byte_count;
 833
 834         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 835         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 836
 837         mutex_unlock(&dev->struct_mutex);
 838
 839         request->count = entry->buf_count;
 840         request->size = size;
 841
 842         dma->flags = _DRM_DMA_USE_AGP;
 843
 844         atomic_dec(&dev->buf_alloc);
 845         return 0;
 846 }
 847 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
 848 #endif /* CONFIG_AGP */
 849
 850 int drm_legacy_addbufs_pci(struct drm_device *dev,
 851                            struct drm_buf_desc *request)
 852 {
 853         struct drm_device_dma *dma = dev->dma;
 854         int count;
 855         int order;
 856         int size;
 857         int total;
 858         int page_order;
 859         struct drm_buf_entry *entry;
 860         drm_dma_handle_t *dmah;
 861         struct drm_buf *buf;
 862         int alignment;
 863         unsigned long offset;
 864         int i;
 865         int byte_count;
 866         int page_count;
 867         unsigned long *temp_pagelist;
 868         struct drm_buf **temp_buflist;
 869
 870         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 871                 return -EINVAL;
 872
 873         if (!dma)
 874                 return -EINVAL;
 875
 876         if (!capable(CAP_SYS_ADMIN))
 877                 return -EPERM;
 878
 879         count = request->count;
 880         order = order_base_2(request->size);
 881         size = 1 << order;
 882
 883         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 884                   request->count, request->size, size, order);
 885
 886         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 887                 return -EINVAL;
 888
 889         alignment = (request->flags & _DRM_PAGE_ALIGN)
 890             ? PAGE_ALIGN(size) : size;
 891         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 892         total = PAGE_SIZE << page_order;
 893
 894         lockmgr(&dev->buf_lock, LK_EXCLUSIVE);
 895         if (dev->buf_use) {
 896                 lockmgr(&dev->buf_lock, LK_RELEASE);
 897                 return -EBUSY;
 898         }
 899         atomic_inc(&dev->buf_alloc);
 900         lockmgr(&dev->buf_lock, LK_RELEASE);
 901
 902         mutex_lock(&dev->struct_mutex);
 903         entry = &dma->bufs[order];
 904         if (entry->buf_count) {
 905                 mutex_unlock(&dev->struct_mutex);
 906                 atomic_dec(&dev->buf_alloc);
 907                 return -ENOMEM; /* May only call once for each order */
 908         }
 909
 910         if (count < 0 || count > 4096) {
 911                 mutex_unlock(&dev->struct_mutex);
 912                 atomic_dec(&dev->buf_alloc);
 913                 return -EINVAL;
 914         }
 915
 916         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 917         if (!entry->buflist) {
 918                 mutex_unlock(&dev->struct_mutex);
 919                 atomic_dec(&dev->buf_alloc);
 920                 return -ENOMEM;
 921         }
 922
 923         entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
 924         if (!entry->seglist) {
 925                 kfree(entry->buflist);
 926                 mutex_unlock(&dev->struct_mutex);
 927                 atomic_dec(&dev->buf_alloc);
 928                 return -ENOMEM;
 929         }
 930
 931         /* Keep the original pagelist until we know all the allocations
 932          * have succeeded
 933          */
 934         temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
 935                                       sizeof(*dma->pagelist),
 936                                       GFP_KERNEL);
 937         if (!temp_pagelist) {
 938                 kfree(entry->buflist);
 939                 kfree(entry->seglist);
 940                 mutex_unlock(&dev->struct_mutex);
 941                 atomic_dec(&dev->buf_alloc);
 942                 return -ENOMEM;
 943         }
 944         memcpy(temp_pagelist,
 945                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 946         DRM_DEBUG("pagelist: %d entries\n",
 947                   dma->page_count + (count << page_order));
 948
 949         entry->buf_size = size;
 950         entry->page_order = page_order;
 951         byte_count = 0;
 952         page_count = 0;
 953
 954         while (entry->buf_count < count) {
 955
 956                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 957
 958                 if (!dmah) {
 959                         /* Set count correctly so we free the proper amount. */
 960                         entry->buf_count = count;
 961                         entry->seg_count = count;
 962                         drm_cleanup_buf_error(dev, entry);
 963                         kfree(temp_pagelist);
 964                         mutex_unlock(&dev->struct_mutex);
 965                         atomic_dec(&dev->buf_alloc);
 966                         return -ENOMEM;
 967                 }
 968                 entry->seglist[entry->seg_count++] = dmah;
 969                 for (i = 0; i < (1 << page_order); i++) {
 970                         DRM_DEBUG("page %d @ 0x%08lx\n",
 971                                   dma->page_count + page_count,
 972                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 973                         temp_pagelist[dma->page_count + page_count++]
 974                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 975                 }
 976                 for (offset = 0;
 977                      offset + size <= total && entry->buf_count < count;
 978                      offset += alignment, ++entry->buf_count) {
 979                         buf = &entry->buflist[entry->buf_count];
 980                         buf->idx = dma->buf_count + entry->buf_count;
 981                         buf->total = alignment;
 982                         buf->order = order;
 983                         buf->used = 0;
 984                         buf->offset = (dma->byte_count + byte_count + offset);
 985                         buf->address = (void *)(dmah->vaddr + offset);
 986                         buf->bus_address = dmah->busaddr + offset;
 987                         buf->next = NULL;
 988                         buf->waiting = 0;
 989                         buf->pending = 0;
 990                         buf->file_priv = NULL;
 991
 992                         buf->dev_priv_size = dev->driver->dev_priv_size;
 993                         buf->dev_private = kzalloc(buf->dev_priv_size,
 994                                                 GFP_KERNEL);
 995                         if (!buf->dev_private) {
 996                                 /* Set count correctly so we free the proper amount. */
 997                                 entry->buf_count = count;
 998                                 entry->seg_count = count;
 999                                 drm_cleanup_buf_error(dev, entry);
1000                                 kfree(temp_pagelist);
1001                                 mutex_unlock(&dev->struct_mutex);
1002                                 atomic_dec(&dev->buf_alloc);
1003                                 return -ENOMEM;
1004                         }
1005
1006                         DRM_DEBUG("buffer %d @ %p\n",
1007                                   entry->buf_count, buf->address);
1008                 }
1009                 byte_count += PAGE_SIZE << page_order;
1010         }
1011
1012         temp_buflist = krealloc(dma->buflist,
1013                                 (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist),
1014                                 M_DRM, GFP_KERNEL);
1015         if (!temp_buflist) {
1016                 /* Free the entry because it isn't valid */
1017                 drm_cleanup_buf_error(dev, entry);
1018                 kfree(temp_pagelist);
1019                 mutex_unlock(&dev->struct_mutex);
1020                 atomic_dec(&dev->buf_alloc);
1021                 return -ENOMEM;
1022         }
1023         dma->buflist = temp_buflist;
1024
1025         for (i = 0; i < entry->buf_count; i++) {
1026                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1027         }
1028
1029         /* No allocations failed, so now we can replace the original pagelist
1030          * with the new one.
1031          */
1032         if (dma->page_count) {
1033                 kfree(dma->pagelist);
1034         }
1035         dma->pagelist = temp_pagelist;
1036
1037         dma->buf_count += entry->buf_count;
1038         dma->seg_count += entry->seg_count;
1039         dma->page_count += entry->seg_count << page_order;
1040         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1041
1042         mutex_unlock(&dev->struct_mutex);
1043
1044         request->count = entry->buf_count;
1045         request->size = size;
1046
1047         if (request->flags & _DRM_PCI_BUFFER_RO)
1048                 dma->flags = _DRM_DMA_USE_PCI_RO;
1049
1050         atomic_dec(&dev->buf_alloc);
1051         return 0;
1052
1053 }
1054 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1055
1056 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1057                                  struct drm_buf_desc *request)
1058 {
1059         struct drm_device_dma *dma = dev->dma;
1060         struct drm_buf_entry *entry;
1061         struct drm_buf *buf;
1062         unsigned long offset;
1063         unsigned long agp_offset;
1064         int count;
1065         int order;
1066         int size;
1067         int alignment;
1068         int page_order;
1069         int total;
1070         int byte_count;
1071         int i;
1072         struct drm_buf **temp_buflist;
1073
1074         if (!drm_core_check_feature(dev, DRIVER_SG))
1075                 return -EINVAL;
1076
1077         if (!dma)
1078                 return -EINVAL;
1079
1080         if (!capable(CAP_SYS_ADMIN))
1081                 return -EPERM;
1082
1083         count = request->count;
1084         order = order_base_2(request->size);
1085         size = 1 << order;
1086
1087         alignment = (request->flags & _DRM_PAGE_ALIGN)
1088             ? PAGE_ALIGN(size) : size;
1089         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1090         total = PAGE_SIZE << page_order;
1091
1092         byte_count = 0;
1093         agp_offset = request->agp_start;
1094
1095         DRM_DEBUG("count:      %d\n", count);
1096         DRM_DEBUG("order:      %d\n", order);
1097         DRM_DEBUG("size:       %d\n", size);
1098         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1099         DRM_DEBUG("alignment:  %d\n", alignment);
1100         DRM_DEBUG("page_order: %d\n", page_order);
1101         DRM_DEBUG("total:      %d\n", total);
1102
1103         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1104                 return -EINVAL;
1105
1106         lockmgr(&dev->buf_lock, LK_EXCLUSIVE);
1107         if (dev->buf_use) {
1108                 lockmgr(&dev->buf_lock, LK_RELEASE);
1109                 return -EBUSY;
1110         }
1111         atomic_inc(&dev->buf_alloc);
1112         lockmgr(&dev->buf_lock, LK_RELEASE);
1113
1114         mutex_lock(&dev->struct_mutex);
1115         entry = &dma->bufs[order];
1116         if (entry->buf_count) {
1117                 mutex_unlock(&dev->struct_mutex);
1118                 atomic_dec(&dev->buf_alloc);
1119                 return -ENOMEM; /* May only call once for each order */
1120         }
1121
1122         if (count < 0 || count > 4096) {
1123                 mutex_unlock(&dev->struct_mutex);
1124                 atomic_dec(&dev->buf_alloc);
1125                 return -EINVAL;
1126         }
1127
1128         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1129         if (!entry->buflist) {
1130                 mutex_unlock(&dev->struct_mutex);
1131                 atomic_dec(&dev->buf_alloc);
1132                 return -ENOMEM;
1133         }
1134
1135         entry->buf_size = size;
1136         entry->page_order = page_order;
1137
1138         offset = 0;
1139
1140         while (entry->buf_count < count) {
1141                 buf = &entry->buflist[entry->buf_count];
1142                 buf->idx = dma->buf_count + entry->buf_count;
1143                 buf->total = alignment;
1144                 buf->order = order;
1145                 buf->used = 0;
1146
1147                 buf->offset = (dma->byte_count + offset);
1148                 buf->bus_address = agp_offset + offset;
1149                 buf->address = (void *)(agp_offset + offset + dev->sg->vaddr);
1150                 buf->next = NULL;
1151                 buf->waiting = 0;
1152                 buf->pending = 0;
1153                 buf->file_priv = NULL;
1154
1155                 buf->dev_priv_size = dev->driver->dev_priv_size;
1156                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1157                 if (!buf->dev_private) {
1158                         /* Set count correctly so we free the proper amount. */
1159                         entry->buf_count = count;
1160                         drm_cleanup_buf_error(dev, entry);
1161                         mutex_unlock(&dev->struct_mutex);
1162                         atomic_dec(&dev->buf_alloc);
1163                         return -ENOMEM;
1164                 }
1165
1166                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1167
1168                 offset += alignment;
1169                 entry->buf_count++;
1170                 byte_count += PAGE_SIZE << page_order;
1171         }
1172
1173         DRM_DEBUG("byte_count: %d\n", byte_count);
1174
1175         temp_buflist = krealloc(dma->buflist,
1176                                 (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist),
1177                                 M_DRM, GFP_KERNEL);
1178         if (!temp_buflist) {
1179                 /* Free the entry because it isn't valid */
1180                 drm_cleanup_buf_error(dev, entry);
1181                 mutex_unlock(&dev->struct_mutex);
1182                 atomic_dec(&dev->buf_alloc);
1183                 return -ENOMEM;
1184         }
1185         dma->buflist = temp_buflist;
1186
1187         for (i = 0; i < entry->buf_count; i++) {
1188                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1189         }
1190
1191         dma->buf_count += entry->buf_count;
1192         dma->seg_count += entry->seg_count;
1193         dma->page_count += byte_count >> PAGE_SHIFT;
1194         dma->byte_count += byte_count;
1195
1196         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1197         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1198
1199         mutex_unlock(&dev->struct_mutex);
1200
1201         request->count = entry->buf_count;
1202         request->size = size;
1203
1204         dma->flags = _DRM_DMA_USE_SG;
1205
1206         atomic_dec(&dev->buf_alloc);
1207         return 0;
1208 }
1209
1210 /**
1211  * Add buffers for DMA transfers (ioctl).
1212  *
1213  * \param inode device inode.
1214  * \param file_priv DRM file private.
1215  * \param cmd command.
1216  * \param arg pointer to a struct drm_buf_desc request.
1217  * \return zero on success or a negative number on failure.
1218  *
1219  * According with the memory type specified in drm_buf_desc::flags and the
1220  * build options, it dispatches the call either to addbufs_agp(),
1221  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1222  * PCI memory respectively.
1223  */
1224 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1225                        struct drm_file *file_priv)
1226 {
1227         struct drm_buf_desc *request = data;
1228         int ret;
1229
1230         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1231                 return -EINVAL;
1232
1233         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1234                 return -EINVAL;
1235
1236 #if IS_ENABLED(CONFIG_AGP)
1237         if (request->flags & _DRM_AGP_BUFFER)
1238                 ret = drm_legacy_addbufs_agp(dev, request);
1239         else
1240 #endif
1241         if (request->flags & _DRM_SG_BUFFER)
1242                 ret = drm_legacy_addbufs_sg(dev, request);
1243         else if (request->flags & _DRM_FB_BUFFER)
1244                 ret = -EINVAL;
1245         else
1246                 ret = drm_legacy_addbufs_pci(dev, request);
1247
1248         return ret;
1249 }
1250
1251 /**
1252  * Get information about the buffer mappings.
1253  *
1254  * This was originally mean for debugging purposes, or by a sophisticated
1255  * client library to determine how best to use the available buffers (e.g.,
1256  * large buffers can be used for image transfer).
1257  *
1258  * \param inode device inode.
1259  * \param file_priv DRM file private.
1260  * \param cmd command.
1261  * \param arg pointer to a drm_buf_info structure.
1262  * \return zero on success or a negative number on failure.
1263  *
1264  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1265  * lock, preventing of allocating more buffers after this call. Information
1266  * about each requested buffer is then copied into user space.
1267  */
1268 int __drm_legacy_infobufs(struct drm_device *dev,
1269                         void *data, int *p,
1270                         int (*f)(void *, int, struct drm_buf_entry *))
1271 {
1272         struct drm_device_dma *dma = dev->dma;
1273         int i;
1274         int count;
1275
1276         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1277                 return -EINVAL;
1278
1279         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1280                 return -EINVAL;
1281
1282         if (!dma)
1283                 return -EINVAL;
1284
1285         lockmgr(&dev->buf_lock, LK_EXCLUSIVE);
1286         if (atomic_read(&dev->buf_alloc)) {
1287                 lockmgr(&dev->buf_lock, LK_RELEASE);
1288                 return -EBUSY;
1289         }
1290         ++dev->buf_use;         /* Can't allocate more after this call */
1291         lockmgr(&dev->buf_lock, LK_RELEASE);
1292
1293         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1294                 if (dma->bufs[i].buf_count)
1295                         ++count;
1296         }
1297
1298         DRM_DEBUG("count = %d\n", count);
1299
1300         if (*p >= count) {
1301                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1302                         struct drm_buf_entry *from = &dma->bufs[i];
1303                         if (from->buf_count) {
1304                                 if (f(data, count, from) < 0)
1305                                         return -EFAULT;
1306                                 DRM_DEBUG("%d %d %d %d %d\n",
1307                                           i,
1308                                           dma->bufs[i].buf_count,
1309                                           dma->bufs[i].buf_size,
1310                                           dma->bufs[i].low_mark,
1311                                           dma->bufs[i].high_mark);
1312                                 ++count;
1313                         }
1314                 }
1315         }
1316         *p = count;
1317
1318         return 0;
1319 }
1320
1321 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1322 {
1323         struct drm_buf_info *request = data;
1324         struct drm_buf_desc __user *to = &request->list[count];
1325         struct drm_buf_desc v = {.count = from->buf_count,
1326                                  .size = from->buf_size,
1327                                  .low_mark = from->low_mark,
1328                                  .high_mark = from->high_mark};
1329         return copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags));
1330 }
1331
1332 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1333                         struct drm_file *file_priv)
1334 {
1335         struct drm_buf_info *request = data;
1336         return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1337 }
1338
1339 /**
1340  * Specifies a low and high water mark for buffer allocation
1341  *
1342  * \param inode device inode.
1343  * \param file_priv DRM file private.
1344  * \param cmd command.
1345  * \param arg a pointer to a drm_buf_desc structure.
1346  * \return zero on success or a negative number on failure.
1347  *
1348  * Verifies that the size order is bounded between the admissible orders and
1349  * updates the respective drm_device_dma::bufs entry low and high water mark.
1350  *
1351  * \note This ioctl is deprecated and mostly never used.
1352  */
1353 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1354                         struct drm_file *file_priv)
1355 {
1356         struct drm_device_dma *dma = dev->dma;
1357         struct drm_buf_desc *request = data;
1358         int order;
1359         struct drm_buf_entry *entry;
1360
1361         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1362                 return -EINVAL;
1363
1364         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1365                 return -EINVAL;
1366
1367         if (!dma)
1368                 return -EINVAL;
1369
1370         DRM_DEBUG("%d, %d, %d\n",
1371                   request->size, request->low_mark, request->high_mark);
1372         order = order_base_2(request->size);
1373         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1374                 return -EINVAL;
1375         entry = &dma->bufs[order];
1376
1377         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1378                 return -EINVAL;
1379         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1380                 return -EINVAL;
1381
1382         entry->low_mark = request->low_mark;
1383         entry->high_mark = request->high_mark;
1384
1385         return 0;
1386 }
1387
1388 /**
1389  * Unreserve the buffers in list, previously reserved using drmDMA.
1390  *
1391  * \param inode device inode.
1392  * \param file_priv DRM file private.
1393  * \param cmd command.
1394  * \param arg pointer to a drm_buf_free structure.
1395  * \return zero on success or a negative number on failure.
1396  *
1397  * Calls free_buffer() for each used buffer.
1398  * This function is primarily used for debugging.
1399  */
1400 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1401                         struct drm_file *file_priv)
1402 {
1403         struct drm_device_dma *dma = dev->dma;
1404         struct drm_buf_free *request = data;
1405         int i;
1406         int idx;
1407         struct drm_buf *buf;
1408
1409         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1410                 return -EINVAL;
1411
1412         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1413                 return -EINVAL;
1414
1415         if (!dma)
1416                 return -EINVAL;
1417
1418         DRM_DEBUG("%d\n", request->count);
1419         for (i = 0; i < request->count; i++) {
1420                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1421                         return -EFAULT;
1422                 if (idx < 0 || idx >= dma->buf_count) {
1423                         DRM_ERROR("Index %d (of %d max)\n",
1424                                   idx, dma->buf_count - 1);
1425                         return -EINVAL;
1426                 }
1427                 buf = dma->buflist[idx];
1428                 if (buf->file_priv != file_priv) {
1429                         DRM_ERROR("Process %d freeing buffer not owned\n",
1430                                   DRM_CURRENTPID);
1431                         return -EINVAL;
1432                 }
1433                 drm_legacy_free_buffer(dev, buf);
1434         }
1435
1436         return 0;
1437 }
1438
1439 /**
1440  * Maps all of the DMA buffers into client-virtual space (ioctl).
1441  *
1442  * \param inode device inode.
1443  * \param file_priv DRM file private.
1444  * \param cmd command.
1445  * \param arg pointer to a drm_buf_map structure.
1446  * \return zero on success or a negative number on failure.
1447  *
1448  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1449  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1450  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1451  * drm_mmap_dma().
1452  */
1453 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1454                          void __user **v,
1455                          int (*f)(void *, int, unsigned long,
1456                                   struct drm_buf *),
1457                          struct drm_file *file_priv)
1458 {
1459 #ifndef __DragonFly__
1460         struct drm_device_dma *dma = dev->dma;
1461         int retcode = 0;
1462         unsigned long virtual;
1463         int i;
1464
1465         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1466                 return -EINVAL;
1467
1468         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1469                 return -EINVAL;
1470
1471         if (!dma)
1472                 return -EINVAL;
1473
1474         lockmgr(&dev->buf_lock, LK_EXCLUSIVE);
1475         if (atomic_read(&dev->buf_alloc)) {
1476                 lockmgr(&dev->buf_lock, LK_RELEASE);
1477                 return -EBUSY;
1478         }
1479         dev->buf_use++;         /* Can't allocate more after this call */
1480         lockmgr(&dev->buf_lock, LK_RELEASE);
1481
1482         if (*p >= dma->buf_count) {
1483                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1484                     || (drm_core_check_feature(dev, DRIVER_SG)
1485                         && (dma->flags & _DRM_DMA_USE_SG))) {
1486                         struct drm_local_map *map = dev->agp_buffer_map;
1487                         unsigned long token = dev->agp_buffer_token;
1488
1489                         if (!map) {
1490                                 retcode = -EINVAL;
1491                                 goto done;
1492                         }
1493                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1494                                           PROT_READ | PROT_WRITE,
1495                                           MAP_SHARED,
1496                                           token, NULL);
1497                 } else {
1498                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1499                                           PROT_READ | PROT_WRITE,
1500                                           MAP_SHARED,
1501                                           0, NULL);
1502                 }
1503                 if (virtual > -1024UL) {
1504                         /* Real error */
1505                         retcode = (signed long)virtual;
1506                         goto done;
1507                 }
1508                 *v = (void __user *)virtual;
1509
1510                 for (i = 0; i < dma->buf_count; i++) {
1511                         if (f(data, i, virtual, dma->buflist[i]) < 0) {
1512                                 retcode = -EFAULT;
1513                                 goto done;
1514                         }
1515                 }
1516         }
1517       done:
1518         *p = dma->buf_count;
1519         DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1520
1521         return retcode;
1522 #else
1523         return -EINVAL;
1524 #endif
1525 }
1526
1527 static int map_one_buf(void *data, int idx, unsigned long virtual,
1528                         struct drm_buf *buf)
1529 {
1530 #ifndef __DragonFly__
1531         struct drm_buf_map *request = data;
1532         unsigned long address = virtual + buf->offset;  /* *** */
1533
1534         if (copy_to_user(&request->list[idx].idx, &buf->idx,
1535                          sizeof(request->list[0].idx)))
1536                 return -EFAULT;
1537         if (copy_to_user(&request->list[idx].total, &buf->total,
1538                          sizeof(request->list[0].total)))
1539                 return -EFAULT;
1540         if (clear_user(&request->list[idx].used, sizeof(int)))
1541                 return -EFAULT;
1542         if (copy_to_user(&request->list[idx].address, &address,
1543                          sizeof(address)))
1544                 return -EFAULT;
1545 #endif
1546         return 0;
1547 }
1548
1549 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1550                        struct drm_file *file_priv)
1551 {
1552         struct drm_buf_map *request = data;
1553         return __drm_legacy_mapbufs(dev, data, &request->count,
1554                                     &request->virtual, map_one_buf,
1555                                     file_priv);
1556 }
1557
1558 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1559                   struct drm_file *file_priv)
1560 {
1561         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1562                 return -EINVAL;
1563
1564         if (dev->driver->dma_ioctl)
1565                 return dev->driver->dma_ioctl(dev, data, file_priv);
1566         else
1567                 return -EINVAL;
1568 }
1569
1570 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1571 {
1572         struct drm_map_list *entry;
1573
1574         list_for_each_entry(entry, &dev->maplist, head) {
1575                 if (entry->map && entry->map->type == _DRM_SHM &&
1576                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1577                         return entry->map;
1578                 }
1579         }
1580         return NULL;
1581 }
1582 EXPORT_SYMBOL(drm_legacy_getsarea);