drivers/gpu/drm/drm_vm.c

   1 /**
   2  * \file drm_vm.c
   3  * Memory mapping for DRM
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  */
   8
   9 /*
  10  * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
  11  *
  12  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  13  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  14  * All Rights Reserved.
  15  *
  16  * Permission is hereby granted, free of charge, to any person obtaining a
  17  * copy of this software and associated documentation files (the "Software"),
  18  * to deal in the Software without restriction, including without limitation
  19  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  20  * and/or sell copies of the Software, and to permit persons to whom the
  21  * Software is furnished to do so, subject to the following conditions:
  22  *
  23  * The above copyright notice and this permission notice (including the next
  24  * paragraph) shall be included in all copies or substantial portions of the
  25  * Software.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  28  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  30  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  31  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  32  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  33  * OTHER DEALINGS IN THE SOFTWARE.
  34  */
  35
  36 #include <drm/drmP.h>
  37 #include <linux/export.h>
  38 #include <linux/seq_file.h>
  39 #if defined(__ia64__)
  40 #include <linux/efi.h>
  41 #include <linux/slab.h>
  42 #endif
  43 #include <asm/pgtable.h>
  44 #include "drm_legacy.h"
  45
  46 struct drm_vma_entry {
  47         struct list_head head;
  48         struct vm_area_struct *vma;
  49         pid_t pid;
  50 };
  51
  52 static void drm_vm_open(struct vm_area_struct *vma);
  53 static void drm_vm_close(struct vm_area_struct *vma);
  54
  55 static pgprot_t drm_io_prot(struct drm_local_map *map,
  56                             struct vm_area_struct *vma)
  57 {
  58         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  59
  60 #if defined(__i386__) || defined(__x86_64__)
  61         if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
  62                 tmp = pgprot_noncached(tmp);
  63         else
  64                 tmp = pgprot_writecombine(tmp);
  65 #elif defined(__powerpc__)
  66         pgprot_val(tmp) |= _PAGE_NO_CACHE;
  67         if (map->type == _DRM_REGISTERS)
  68                 pgprot_val(tmp) |= _PAGE_GUARDED;
  69 #elif defined(__ia64__)
  70         if (efi_range_is_wc(vma->vm_start, vma->vm_end -
  71                                     vma->vm_start))
  72                 tmp = pgprot_writecombine(tmp);
  73         else
  74                 tmp = pgprot_noncached(tmp);
  75 #elif defined(__sparc__) || defined(__arm__) || defined(__mips__)
  76         tmp = pgprot_noncached(tmp);
  77 #endif
  78         return tmp;
  79 }
  80
  81 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
  82 {
  83         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  84
  85 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
  86         tmp |= _PAGE_NO_CACHE;
  87 #endif
  88         return tmp;
  89 }
  90
  91 /**
  92  * \c fault method for AGP virtual memory.
  93  *
  94  * \param vma virtual memory area.
  95  * \param address access address.
  96  * \return pointer to the page structure.
  97  *
  98  * Find the right map and if it's AGP memory find the real physical page to
  99  * map, get the page, increment the use count and return it.
 100  */
 101 #if __OS_HAS_AGP
 102 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 103 {
 104         struct drm_file *priv = vma->vm_file->private_data;
 105         struct drm_device *dev = priv->minor->dev;
 106         struct drm_local_map *map = NULL;
 107         struct drm_map_list *r_list;
 108         struct drm_hash_item *hash;
 109
 110         /*
 111          * Find the right map
 112          */
 113         if (!dev->agp)
 114                 goto vm_fault_error;
 115
 116         if (!dev->agp || !dev->agp->cant_use_aperture)
 117                 goto vm_fault_error;
 118
 119         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
 120                 goto vm_fault_error;
 121
 122         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 123         map = r_list->map;
 124
 125         if (map && map->type == _DRM_AGP) {
 126                 /*
 127                  * Using vm_pgoff as a selector forces us to use this unusual
 128                  * addressing scheme.
 129                  */
 130                 resource_size_t offset = (unsigned long)vmf->virtual_address -
 131                         vma->vm_start;
 132                 resource_size_t baddr = map->offset + offset;
 133                 struct drm_agp_mem *agpmem;
 134                 struct page *page;
 135
 136 #ifdef __alpha__
 137                 /*
 138                  * Adjust to a bus-relative address
 139                  */
 140                 baddr -= dev->hose->mem_space->start;
 141 #endif
 142
 143                 /*
 144                  * It's AGP memory - find the real physical page to map
 145                  */
 146                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
 147                         if (agpmem->bound <= baddr &&
 148                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 149                                 break;
 150                 }
 151
 152                 if (&agpmem->head == &dev->agp->memory)
 153                         goto vm_fault_error;
 154
 155                 /*
 156                  * Get the page, inc the use count, and return it
 157                  */
 158                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 159                 page = agpmem->memory->pages[offset];
 160                 get_page(page);
 161                 vmf->page = page;
 162
 163                 DRM_DEBUG
 164                     ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
 165                      (unsigned long long)baddr,
 166                      agpmem->memory->pages[offset],
 167                      (unsigned long long)offset,
 168                      page_count(page));
 169                 return 0;
 170         }
 171 vm_fault_error:
 172         return VM_FAULT_SIGBUS; /* Disallow mremap */
 173 }
 174 #else                           /* __OS_HAS_AGP */
 175 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 176 {
 177         return VM_FAULT_SIGBUS;
 178 }
 179 #endif                          /* __OS_HAS_AGP */
 180
 181 /**
 182  * \c nopage method for shared virtual memory.
 183  *
 184  * \param vma virtual memory area.
 185  * \param address access address.
 186  * \return pointer to the page structure.
 187  *
 188  * Get the mapping, find the real physical page to map, get the page, and
 189  * return it.
 190  */
 191 static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 192 {
 193         struct drm_local_map *map = vma->vm_private_data;
 194         unsigned long offset;
 195         unsigned long i;
 196         struct page *page;
 197
 198         if (!map)
 199                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 200
 201         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 202         i = (unsigned long)map->handle + offset;
 203         page = vmalloc_to_page((void *)i);
 204         if (!page)
 205                 return VM_FAULT_SIGBUS;
 206         get_page(page);
 207         vmf->page = page;
 208
 209         DRM_DEBUG("shm_fault 0x%lx\n", offset);
 210         return 0;
 211 }
 212
 213 /**
 214  * \c close method for shared virtual memory.
 215  *
 216  * \param vma virtual memory area.
 217  *
 218  * Deletes map information if we are the last
 219  * person to close a mapping and it's not in the global maplist.
 220  */
 221 static void drm_vm_shm_close(struct vm_area_struct *vma)
 222 {
 223         struct drm_file *priv = vma->vm_file->private_data;
 224         struct drm_device *dev = priv->minor->dev;
 225         struct drm_vma_entry *pt, *temp;
 226         struct drm_local_map *map;
 227         struct drm_map_list *r_list;
 228         int found_maps = 0;
 229
 230         DRM_DEBUG("0x%08lx,0x%08lx\n",
 231                   vma->vm_start, vma->vm_end - vma->vm_start);
 232
 233         map = vma->vm_private_data;
 234
 235         mutex_lock(&dev->struct_mutex);
 236         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 237                 if (pt->vma->vm_private_data == map)
 238                         found_maps++;
 239                 if (pt->vma == vma) {
 240                         list_del(&pt->head);
 241                         kfree(pt);
 242                 }
 243         }
 244
 245         /* We were the only map that was found */
 246         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 247                 /* Check to see if we are in the maplist, if we are not, then
 248                  * we delete this mappings information.
 249                  */
 250                 found_maps = 0;
 251                 list_for_each_entry(r_list, &dev->maplist, head) {
 252                         if (r_list->map == map)
 253                                 found_maps++;
 254                 }
 255
 256                 if (!found_maps) {
 257                         drm_dma_handle_t dmah;
 258
 259                         switch (map->type) {
 260                         case _DRM_REGISTERS:
 261                         case _DRM_FRAME_BUFFER:
 262                                 arch_phys_wc_del(map->mtrr);
 263                                 iounmap(map->handle);
 264                                 break;
 265                         case _DRM_SHM:
 266                                 vfree(map->handle);
 267                                 break;
 268                         case _DRM_AGP:
 269                         case _DRM_SCATTER_GATHER:
 270                                 break;
 271                         case _DRM_CONSISTENT:
 272                                 dmah.vaddr = map->handle;
 273                                 dmah.busaddr = map->offset;
 274                                 dmah.size = map->size;
 275                                 __drm_legacy_pci_free(dev, &dmah);
 276                                 break;
 277                         }
 278                         kfree(map);
 279                 }
 280         }
 281         mutex_unlock(&dev->struct_mutex);
 282 }
 283
 284 /**
 285  * \c fault method for DMA virtual memory.
 286  *
 287  * \param vma virtual memory area.
 288  * \param address access address.
 289  * \return pointer to the page structure.
 290  *
 291  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 292  */
 293 static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 294 {
 295         struct drm_file *priv = vma->vm_file->private_data;
 296         struct drm_device *dev = priv->minor->dev;
 297         struct drm_device_dma *dma = dev->dma;
 298         unsigned long offset;
 299         unsigned long page_nr;
 300         struct page *page;
 301
 302         if (!dma)
 303                 return VM_FAULT_SIGBUS; /* Error */
 304         if (!dma->pagelist)
 305                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 306
 307         offset = (unsigned long)vmf->virtual_address - vma->vm_start;   /* vm_[pg]off[set] should be 0 */
 308         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 309         page = virt_to_page((void *)dma->pagelist[page_nr]);
 310
 311         get_page(page);
 312         vmf->page = page;
 313
 314         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
 315         return 0;
 316 }
 317
 318 /**
 319  * \c fault method for scatter-gather virtual memory.
 320  *
 321  * \param vma virtual memory area.
 322  * \param address access address.
 323  * \return pointer to the page structure.
 324  *
 325  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 326  */
 327 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 328 {
 329         struct drm_local_map *map = vma->vm_private_data;
 330         struct drm_file *priv = vma->vm_file->private_data;
 331         struct drm_device *dev = priv->minor->dev;
 332         struct drm_sg_mem *entry = dev->sg;
 333         unsigned long offset;
 334         unsigned long map_offset;
 335         unsigned long page_offset;
 336         struct page *page;
 337
 338         if (!entry)
 339                 return VM_FAULT_SIGBUS; /* Error */
 340         if (!entry->pagelist)
 341                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 342
 343         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 344         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 345         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 346         page = entry->pagelist[page_offset];
 347         get_page(page);
 348         vmf->page = page;
 349
 350         return 0;
 351 }
 352
 353 static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 354 {
 355         return drm_do_vm_fault(vma, vmf);
 356 }
 357
 358 static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 359 {
 360         return drm_do_vm_shm_fault(vma, vmf);
 361 }
 362
 363 static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 364 {
 365         return drm_do_vm_dma_fault(vma, vmf);
 366 }
 367
 368 static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 369 {
 370         return drm_do_vm_sg_fault(vma, vmf);
 371 }
 372
 373 /** AGP virtual memory operations */
 374 static const struct vm_operations_struct drm_vm_ops = {
 375         .fault = drm_vm_fault,
 376         .open = drm_vm_open,
 377         .close = drm_vm_close,
 378 };
 379
 380 /** Shared virtual memory operations */
 381 static const struct vm_operations_struct drm_vm_shm_ops = {
 382         .fault = drm_vm_shm_fault,
 383         .open = drm_vm_open,
 384         .close = drm_vm_shm_close,
 385 };
 386
 387 /** DMA virtual memory operations */
 388 static const struct vm_operations_struct drm_vm_dma_ops = {
 389         .fault = drm_vm_dma_fault,
 390         .open = drm_vm_open,
 391         .close = drm_vm_close,
 392 };
 393
 394 /** Scatter-gather virtual memory operations */
 395 static const struct vm_operations_struct drm_vm_sg_ops = {
 396         .fault = drm_vm_sg_fault,
 397         .open = drm_vm_open,
 398         .close = drm_vm_close,
 399 };
 400
 401 /**
 402  * \c open method for shared virtual memory.
 403  *
 404  * \param vma virtual memory area.
 405  *
 406  * Create a new drm_vma_entry structure as the \p vma private data entry and
 407  * add it to drm_device::vmalist.
 408  */
 409 void drm_vm_open_locked(struct drm_device *dev,
 410                 struct vm_area_struct *vma)
 411 {
 412         struct drm_vma_entry *vma_entry;
 413
 414         DRM_DEBUG("0x%08lx,0x%08lx\n",
 415                   vma->vm_start, vma->vm_end - vma->vm_start);
 416
 417         vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
 418         if (vma_entry) {
 419                 vma_entry->vma = vma;
 420                 vma_entry->pid = current->pid;
 421                 list_add(&vma_entry->head, &dev->vmalist);
 422         }
 423 }
 424 EXPORT_SYMBOL_GPL(drm_vm_open_locked);
 425
 426 static void drm_vm_open(struct vm_area_struct *vma)
 427 {
 428         struct drm_file *priv = vma->vm_file->private_data;
 429         struct drm_device *dev = priv->minor->dev;
 430
 431         mutex_lock(&dev->struct_mutex);
 432         drm_vm_open_locked(dev, vma);
 433         mutex_unlock(&dev->struct_mutex);
 434 }
 435
 436 void drm_vm_close_locked(struct drm_device *dev,
 437                 struct vm_area_struct *vma)
 438 {
 439         struct drm_vma_entry *pt, *temp;
 440
 441         DRM_DEBUG("0x%08lx,0x%08lx\n",
 442                   vma->vm_start, vma->vm_end - vma->vm_start);
 443
 444         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 445                 if (pt->vma == vma) {
 446                         list_del(&pt->head);
 447                         kfree(pt);
 448                         break;
 449                 }
 450         }
 451 }
 452
 453 /**
 454  * \c close method for all virtual memory types.
 455  *
 456  * \param vma virtual memory area.
 457  *
 458  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 459  * free it.
 460  */
 461 static void drm_vm_close(struct vm_area_struct *vma)
 462 {
 463         struct drm_file *priv = vma->vm_file->private_data;
 464         struct drm_device *dev = priv->minor->dev;
 465
 466         mutex_lock(&dev->struct_mutex);
 467         drm_vm_close_locked(dev, vma);
 468         mutex_unlock(&dev->struct_mutex);
 469 }
 470
 471 /**
 472  * mmap DMA memory.
 473  *
 474  * \param file_priv DRM file private.
 475  * \param vma virtual memory area.
 476  * \return zero on success or a negative number on failure.
 477  *
 478  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 479  * pointer, and calls vm_open().
 480  */
 481 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 482 {
 483         struct drm_file *priv = filp->private_data;
 484         struct drm_device *dev;
 485         struct drm_device_dma *dma;
 486         unsigned long length = vma->vm_end - vma->vm_start;
 487
 488         dev = priv->minor->dev;
 489         dma = dev->dma;
 490         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 491                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 492
 493         /* Length must match exact page count */
 494         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 495                 return -EINVAL;
 496         }
 497
 498         if (!capable(CAP_SYS_ADMIN) &&
 499             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 500                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 501 #if defined(__i386__) || defined(__x86_64__)
 502                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 503 #else
 504                 /* Ye gads this is ugly.  With more thought
 505                    we could move this up higher and use
 506                    `protection_map' instead.  */
 507                 vma->vm_page_prot =
 508                     __pgprot(pte_val
 509                              (pte_wrprotect
 510                               (__pte(pgprot_val(vma->vm_page_prot)))));
 511 #endif
 512         }
 513
 514         vma->vm_ops = &drm_vm_dma_ops;
 515
 516         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 517
 518         drm_vm_open_locked(dev, vma);
 519         return 0;
 520 }
 521
 522 static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
 523 {
 524 #ifdef __alpha__
 525         return dev->hose->dense_mem_base;
 526 #else
 527         return 0;
 528 #endif
 529 }
 530
 531 /**
 532  * mmap DMA memory.
 533  *
 534  * \param file_priv DRM file private.
 535  * \param vma virtual memory area.
 536  * \return zero on success or a negative number on failure.
 537  *
 538  * If the virtual memory area has no offset associated with it then it's a DMA
 539  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 540  * checks that the restricted flag is not set, sets the virtual memory operations
 541  * according to the mapping type and remaps the pages. Finally sets the file
 542  * pointer and calls vm_open().
 543  */
 544 int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 545 {
 546         struct drm_file *priv = filp->private_data;
 547         struct drm_device *dev = priv->minor->dev;
 548         struct drm_local_map *map = NULL;
 549         resource_size_t offset = 0;
 550         struct drm_hash_item *hash;
 551
 552         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 553                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 554
 555         if (!priv->authenticated)
 556                 return -EACCES;
 557
 558         /* We check for "dma". On Apple's UniNorth, it's valid to have
 559          * the AGP mapped at physical address 0
 560          * --BenH.
 561          */
 562         if (!vma->vm_pgoff
 563 #if __OS_HAS_AGP
 564             && (!dev->agp
 565                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 566 #endif
 567             )
 568                 return drm_mmap_dma(filp, vma);
 569
 570         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 571                 DRM_ERROR("Could not find map\n");
 572                 return -EINVAL;
 573         }
 574
 575         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
 576         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 577                 return -EPERM;
 578
 579         /* Check for valid size. */
 580         if (map->size < vma->vm_end - vma->vm_start)
 581                 return -EINVAL;
 582
 583         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 584                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 585 #if defined(__i386__) || defined(__x86_64__)
 586                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 587 #else
 588                 /* Ye gads this is ugly.  With more thought
 589                    we could move this up higher and use
 590                    `protection_map' instead.  */
 591                 vma->vm_page_prot =
 592                     __pgprot(pte_val
 593                              (pte_wrprotect
 594                               (__pte(pgprot_val(vma->vm_page_prot)))));
 595 #endif
 596         }
 597
 598         switch (map->type) {
 599 #if !defined(__arm__)
 600         case _DRM_AGP:
 601                 if (dev->agp && dev->agp->cant_use_aperture) {
 602                         /*
 603                          * On some platforms we can't talk to bus dma address from the CPU, so for
 604                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 605                          * pages and mappings in fault()
 606                          */
 607 #if defined(__powerpc__)
 608                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 609 #endif
 610                         vma->vm_ops = &drm_vm_ops;
 611                         break;
 612                 }
 613                 /* fall through to _DRM_FRAME_BUFFER... */
 614 #endif
 615         case _DRM_FRAME_BUFFER:
 616         case _DRM_REGISTERS:
 617                 offset = drm_core_get_reg_ofs(dev);
 618                 vma->vm_page_prot = drm_io_prot(map, vma);
 619                 if (io_remap_pfn_range(vma, vma->vm_start,
 620                                        (map->offset + offset) >> PAGE_SHIFT,
 621                                        vma->vm_end - vma->vm_start,
 622                                        vma->vm_page_prot))
 623                         return -EAGAIN;
 624                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 625                           " offset = 0x%llx\n",
 626                           map->type,
 627                           vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
 628
 629                 vma->vm_ops = &drm_vm_ops;
 630                 break;
 631         case _DRM_CONSISTENT:
 632                 /* Consistent memory is really like shared memory. But
 633                  * it's allocated in a different way, so avoid fault */
 634                 if (remap_pfn_range(vma, vma->vm_start,
 635                     page_to_pfn(virt_to_page(map->handle)),
 636                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 637                         return -EAGAIN;
 638                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 639         /* fall through to _DRM_SHM */
 640         case _DRM_SHM:
 641                 vma->vm_ops = &drm_vm_shm_ops;
 642                 vma->vm_private_data = (void *)map;
 643                 break;
 644         case _DRM_SCATTER_GATHER:
 645                 vma->vm_ops = &drm_vm_sg_ops;
 646                 vma->vm_private_data = (void *)map;
 647                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 648                 break;
 649         default:
 650                 return -EINVAL; /* This should never happen. */
 651         }
 652         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 653
 654         drm_vm_open_locked(dev, vma);
 655         return 0;
 656 }
 657
 658 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
 659 {
 660         struct drm_file *priv = filp->private_data;
 661         struct drm_device *dev = priv->minor->dev;
 662         int ret;
 663
 664         if (drm_device_is_unplugged(dev))
 665                 return -ENODEV;
 666
 667         mutex_lock(&dev->struct_mutex);
 668         ret = drm_mmap_locked(filp, vma);
 669         mutex_unlock(&dev->struct_mutex);
 670
 671         return ret;
 672 }
 673 EXPORT_SYMBOL(drm_mmap);
 674
 675 void drm_legacy_vma_flush(struct drm_device *dev)
 676 {
 677         struct drm_vma_entry *vma, *vma_temp;
 678
 679         /* Clear vma list (only needed for legacy drivers) */
 680         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
 681                 list_del(&vma->head);
 682                 kfree(vma);
 683         }
 684 }
 685
 686 int drm_vma_info(struct seq_file *m, void *data)
 687 {
 688         struct drm_info_node *node = (struct drm_info_node *) m->private;
 689         struct drm_device *dev = node->minor->dev;
 690         struct drm_vma_entry *pt;
 691         struct vm_area_struct *vma;
 692         unsigned long vma_count = 0;
 693 #if defined(__i386__)
 694         unsigned int pgprot;
 695 #endif
 696
 697         mutex_lock(&dev->struct_mutex);
 698         list_for_each_entry(pt, &dev->vmalist, head)
 699                 vma_count++;
 700
 701         seq_printf(m, "vma use count: %lu, high_memory = %pK, 0x%pK\n",
 702                    vma_count, high_memory,
 703                    (void *)(unsigned long)virt_to_phys(high_memory));
 704
 705         list_for_each_entry(pt, &dev->vmalist, head) {
 706                 vma = pt->vma;
 707                 if (!vma)
 708                         continue;
 709                 seq_printf(m,
 710                            "\n%5d 0x%pK-0x%pK %c%c%c%c%c%c 0x%08lx000",
 711                            pt->pid,
 712                            (void *)vma->vm_start, (void *)vma->vm_end,
 713                            vma->vm_flags & VM_READ ? 'r' : '-',
 714                            vma->vm_flags & VM_WRITE ? 'w' : '-',
 715                            vma->vm_flags & VM_EXEC ? 'x' : '-',
 716                            vma->vm_flags & VM_MAYSHARE ? 's' : 'p',
 717                            vma->vm_flags & VM_LOCKED ? 'l' : '-',
 718                            vma->vm_flags & VM_IO ? 'i' : '-',
 719                            vma->vm_pgoff);
 720
 721 #if defined(__i386__)
 722                 pgprot = pgprot_val(vma->vm_page_prot);
 723                 seq_printf(m, " %c%c%c%c%c%c%c%c%c",
 724                            pgprot & _PAGE_PRESENT ? 'p' : '-',
 725                            pgprot & _PAGE_RW ? 'w' : 'r',
 726                            pgprot & _PAGE_USER ? 'u' : 's',
 727                            pgprot & _PAGE_PWT ? 't' : 'b',
 728                            pgprot & _PAGE_PCD ? 'u' : 'c',
 729                            pgprot & _PAGE_ACCESSED ? 'a' : '-',
 730                            pgprot & _PAGE_DIRTY ? 'd' : '-',
 731                            pgprot & _PAGE_PSE ? 'm' : 'k',
 732                            pgprot & _PAGE_GLOBAL ? 'g' : 'l');
 733 #endif
 734                 seq_printf(m, "\n");
 735         }
 736         mutex_unlock(&dev->struct_mutex);
 737         return 0;
 738 }