Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm
[linux-2.6] / 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 "drmP.h"
37 #if defined(__ia64__)
38 #include <linux/efi.h>
39 #endif
40
41 static void drm_vm_open(struct vm_area_struct *vma);
42 static void drm_vm_close(struct vm_area_struct *vma);
43
44 static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
45 {
46         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
47
48 #if defined(__i386__) || defined(__x86_64__)
49         if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) {
50                 pgprot_val(tmp) |= _PAGE_PCD;
51                 pgprot_val(tmp) &= ~_PAGE_PWT;
52         }
53 #elif defined(__powerpc__)
54         pgprot_val(tmp) |= _PAGE_NO_CACHE;
55         if (map_type == _DRM_REGISTERS)
56                 pgprot_val(tmp) |= _PAGE_GUARDED;
57 #elif defined(__ia64__)
58         if (efi_range_is_wc(vma->vm_start, vma->vm_end -
59                                     vma->vm_start))
60                 tmp = pgprot_writecombine(tmp);
61         else
62                 tmp = pgprot_noncached(tmp);
63 #elif defined(__sparc__)
64         tmp = pgprot_noncached(tmp);
65 #endif
66         return tmp;
67 }
68
69 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
70 {
71         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
72
73 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
74         tmp |= _PAGE_NO_CACHE;
75 #endif
76         return tmp;
77 }
78
79 /**
80  * \c fault method for AGP virtual memory.
81  *
82  * \param vma virtual memory area.
83  * \param address access address.
84  * \return pointer to the page structure.
85  *
86  * Find the right map and if it's AGP memory find the real physical page to
87  * map, get the page, increment the use count and return it.
88  */
89 #if __OS_HAS_AGP
90 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
91 {
92         struct drm_file *priv = vma->vm_file->private_data;
93         struct drm_device *dev = priv->minor->dev;
94         struct drm_map *map = NULL;
95         struct drm_map_list *r_list;
96         struct drm_hash_item *hash;
97
98         /*
99          * Find the right map
100          */
101         if (!drm_core_has_AGP(dev))
102                 goto vm_fault_error;
103
104         if (!dev->agp || !dev->agp->cant_use_aperture)
105                 goto vm_fault_error;
106
107         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
108                 goto vm_fault_error;
109
110         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
111         map = r_list->map;
112
113         if (map && map->type == _DRM_AGP) {
114                 /*
115                  * Using vm_pgoff as a selector forces us to use this unusual
116                  * addressing scheme.
117                  */
118                 unsigned long offset = (unsigned long)vmf->virtual_address -
119                                                                 vma->vm_start;
120                 unsigned long baddr = map->offset + offset;
121                 struct drm_agp_mem *agpmem;
122                 struct page *page;
123
124 #ifdef __alpha__
125                 /*
126                  * Adjust to a bus-relative address
127                  */
128                 baddr -= dev->hose->mem_space->start;
129 #endif
130
131                 /*
132                  * It's AGP memory - find the real physical page to map
133                  */
134                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
135                         if (agpmem->bound <= baddr &&
136                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
137                                 break;
138                 }
139
140                 if (!agpmem)
141                         goto vm_fault_error;
142
143                 /*
144                  * Get the page, inc the use count, and return it
145                  */
146                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
147                 page = virt_to_page(__va(agpmem->memory->memory[offset]));
148                 get_page(page);
149                 vmf->page = page;
150
151                 DRM_DEBUG
152                     ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
153                      baddr, __va(agpmem->memory->memory[offset]), offset,
154                      page_count(page));
155                 return 0;
156         }
157 vm_fault_error:
158         return VM_FAULT_SIGBUS; /* Disallow mremap */
159 }
160 #else                           /* __OS_HAS_AGP */
161 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
162 {
163         return VM_FAULT_SIGBUS;
164 }
165 #endif                          /* __OS_HAS_AGP */
166
167 /**
168  * \c nopage method for shared virtual memory.
169  *
170  * \param vma virtual memory area.
171  * \param address access address.
172  * \return pointer to the page structure.
173  *
174  * Get the mapping, find the real physical page to map, get the page, and
175  * return it.
176  */
177 static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
178 {
179         struct drm_map *map = (struct drm_map *) vma->vm_private_data;
180         unsigned long offset;
181         unsigned long i;
182         struct page *page;
183
184         if (!map)
185                 return VM_FAULT_SIGBUS; /* Nothing allocated */
186
187         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
188         i = (unsigned long)map->handle + offset;
189         page = vmalloc_to_page((void *)i);
190         if (!page)
191                 return VM_FAULT_SIGBUS;
192         get_page(page);
193         vmf->page = page;
194
195         DRM_DEBUG("shm_fault 0x%lx\n", offset);
196         return 0;
197 }
198
199 /**
200  * \c close method for shared virtual memory.
201  *
202  * \param vma virtual memory area.
203  *
204  * Deletes map information if we are the last
205  * person to close a mapping and it's not in the global maplist.
206  */
207 static void drm_vm_shm_close(struct vm_area_struct *vma)
208 {
209         struct drm_file *priv = vma->vm_file->private_data;
210         struct drm_device *dev = priv->minor->dev;
211         struct drm_vma_entry *pt, *temp;
212         struct drm_map *map;
213         struct drm_map_list *r_list;
214         int found_maps = 0;
215
216         DRM_DEBUG("0x%08lx,0x%08lx\n",
217                   vma->vm_start, vma->vm_end - vma->vm_start);
218         atomic_dec(&dev->vma_count);
219
220         map = vma->vm_private_data;
221
222         mutex_lock(&dev->struct_mutex);
223         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
224                 if (pt->vma->vm_private_data == map)
225                         found_maps++;
226                 if (pt->vma == vma) {
227                         list_del(&pt->head);
228                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
229                 }
230         }
231
232         /* We were the only map that was found */
233         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
234                 /* Check to see if we are in the maplist, if we are not, then
235                  * we delete this mappings information.
236                  */
237                 found_maps = 0;
238                 list_for_each_entry(r_list, &dev->maplist, head) {
239                         if (r_list->map == map)
240                                 found_maps++;
241                 }
242
243                 if (!found_maps) {
244                         drm_dma_handle_t dmah;
245
246                         switch (map->type) {
247                         case _DRM_REGISTERS:
248                         case _DRM_FRAME_BUFFER:
249                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
250                                         int retcode;
251                                         retcode = mtrr_del(map->mtrr,
252                                                            map->offset,
253                                                            map->size);
254                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
255                                 }
256                                 iounmap(map->handle);
257                                 break;
258                         case _DRM_SHM:
259                                 vfree(map->handle);
260                                 break;
261                         case _DRM_AGP:
262                         case _DRM_SCATTER_GATHER:
263                                 break;
264                         case _DRM_CONSISTENT:
265                                 dmah.vaddr = map->handle;
266                                 dmah.busaddr = map->offset;
267                                 dmah.size = map->size;
268                                 __drm_pci_free(dev, &dmah);
269                                 break;
270                         case _DRM_GEM:
271                                 DRM_ERROR("tried to rmmap GEM object\n");
272                                 break;
273                         }
274                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
275                 }
276         }
277         mutex_unlock(&dev->struct_mutex);
278 }
279
280 /**
281  * \c fault method for DMA virtual memory.
282  *
283  * \param vma virtual memory area.
284  * \param address access address.
285  * \return pointer to the page structure.
286  *
287  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
288  */
289 static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
290 {
291         struct drm_file *priv = vma->vm_file->private_data;
292         struct drm_device *dev = priv->minor->dev;
293         struct drm_device_dma *dma = dev->dma;
294         unsigned long offset;
295         unsigned long page_nr;
296         struct page *page;
297
298         if (!dma)
299                 return VM_FAULT_SIGBUS; /* Error */
300         if (!dma->pagelist)
301                 return VM_FAULT_SIGBUS; /* Nothing allocated */
302
303         offset = (unsigned long)vmf->virtual_address - vma->vm_start;   /* vm_[pg]off[set] should be 0 */
304         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
305         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
306
307         get_page(page);
308         vmf->page = page;
309
310         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
311         return 0;
312 }
313
314 /**
315  * \c fault method for scatter-gather virtual memory.
316  *
317  * \param vma virtual memory area.
318  * \param address access address.
319  * \return pointer to the page structure.
320  *
321  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
322  */
323 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
324 {
325         struct drm_map *map = (struct drm_map *) vma->vm_private_data;
326         struct drm_file *priv = vma->vm_file->private_data;
327         struct drm_device *dev = priv->minor->dev;
328         struct drm_sg_mem *entry = dev->sg;
329         unsigned long offset;
330         unsigned long map_offset;
331         unsigned long page_offset;
332         struct page *page;
333
334         if (!entry)
335                 return VM_FAULT_SIGBUS; /* Error */
336         if (!entry->pagelist)
337                 return VM_FAULT_SIGBUS; /* Nothing allocated */
338
339         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
340         map_offset = map->offset - (unsigned long)dev->sg->virtual;
341         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
342         page = entry->pagelist[page_offset];
343         get_page(page);
344         vmf->page = page;
345
346         return 0;
347 }
348
349 static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
350 {
351         return drm_do_vm_fault(vma, vmf);
352 }
353
354 static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
355 {
356         return drm_do_vm_shm_fault(vma, vmf);
357 }
358
359 static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
360 {
361         return drm_do_vm_dma_fault(vma, vmf);
362 }
363
364 static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
365 {
366         return drm_do_vm_sg_fault(vma, vmf);
367 }
368
369 /** AGP virtual memory operations */
370 static struct vm_operations_struct drm_vm_ops = {
371         .fault = drm_vm_fault,
372         .open = drm_vm_open,
373         .close = drm_vm_close,
374 };
375
376 /** Shared virtual memory operations */
377 static struct vm_operations_struct drm_vm_shm_ops = {
378         .fault = drm_vm_shm_fault,
379         .open = drm_vm_open,
380         .close = drm_vm_shm_close,
381 };
382
383 /** DMA virtual memory operations */
384 static struct vm_operations_struct drm_vm_dma_ops = {
385         .fault = drm_vm_dma_fault,
386         .open = drm_vm_open,
387         .close = drm_vm_close,
388 };
389
390 /** Scatter-gather virtual memory operations */
391 static struct vm_operations_struct drm_vm_sg_ops = {
392         .fault = drm_vm_sg_fault,
393         .open = drm_vm_open,
394         .close = drm_vm_close,
395 };
396
397 /**
398  * \c open method for shared virtual memory.
399  *
400  * \param vma virtual memory area.
401  *
402  * Create a new drm_vma_entry structure as the \p vma private data entry and
403  * add it to drm_device::vmalist.
404  */
405 void drm_vm_open_locked(struct vm_area_struct *vma)
406 {
407         struct drm_file *priv = vma->vm_file->private_data;
408         struct drm_device *dev = priv->minor->dev;
409         struct drm_vma_entry *vma_entry;
410
411         DRM_DEBUG("0x%08lx,0x%08lx\n",
412                   vma->vm_start, vma->vm_end - vma->vm_start);
413         atomic_inc(&dev->vma_count);
414
415         vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
416         if (vma_entry) {
417                 vma_entry->vma = vma;
418                 vma_entry->pid = current->pid;
419                 list_add(&vma_entry->head, &dev->vmalist);
420         }
421 }
422
423 static void drm_vm_open(struct vm_area_struct *vma)
424 {
425         struct drm_file *priv = vma->vm_file->private_data;
426         struct drm_device *dev = priv->minor->dev;
427
428         mutex_lock(&dev->struct_mutex);
429         drm_vm_open_locked(vma);
430         mutex_unlock(&dev->struct_mutex);
431 }
432
433 /**
434  * \c close method for all virtual memory types.
435  *
436  * \param vma virtual memory area.
437  *
438  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
439  * free it.
440  */
441 static void drm_vm_close(struct vm_area_struct *vma)
442 {
443         struct drm_file *priv = vma->vm_file->private_data;
444         struct drm_device *dev = priv->minor->dev;
445         struct drm_vma_entry *pt, *temp;
446
447         DRM_DEBUG("0x%08lx,0x%08lx\n",
448                   vma->vm_start, vma->vm_end - vma->vm_start);
449         atomic_dec(&dev->vma_count);
450
451         mutex_lock(&dev->struct_mutex);
452         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
453                 if (pt->vma == vma) {
454                         list_del(&pt->head);
455                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
456                         break;
457                 }
458         }
459         mutex_unlock(&dev->struct_mutex);
460 }
461
462 /**
463  * mmap DMA memory.
464  *
465  * \param file_priv DRM file private.
466  * \param vma virtual memory area.
467  * \return zero on success or a negative number on failure.
468  *
469  * Sets the virtual memory area operations structure to vm_dma_ops, the file
470  * pointer, and calls vm_open().
471  */
472 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
473 {
474         struct drm_file *priv = filp->private_data;
475         struct drm_device *dev;
476         struct drm_device_dma *dma;
477         unsigned long length = vma->vm_end - vma->vm_start;
478
479         dev = priv->minor->dev;
480         dma = dev->dma;
481         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
482                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
483
484         /* Length must match exact page count */
485         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
486                 return -EINVAL;
487         }
488
489         if (!capable(CAP_SYS_ADMIN) &&
490             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
491                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
492 #if defined(__i386__) || defined(__x86_64__)
493                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
494 #else
495                 /* Ye gads this is ugly.  With more thought
496                    we could move this up higher and use
497                    `protection_map' instead.  */
498                 vma->vm_page_prot =
499                     __pgprot(pte_val
500                              (pte_wrprotect
501                               (__pte(pgprot_val(vma->vm_page_prot)))));
502 #endif
503         }
504
505         vma->vm_ops = &drm_vm_dma_ops;
506
507         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
508         vma->vm_flags |= VM_DONTEXPAND;
509
510         vma->vm_file = filp;    /* Needed for drm_vm_open() */
511         drm_vm_open_locked(vma);
512         return 0;
513 }
514
515 unsigned long drm_core_get_map_ofs(struct drm_map * map)
516 {
517         return map->offset;
518 }
519
520 EXPORT_SYMBOL(drm_core_get_map_ofs);
521
522 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
523 {
524 #ifdef __alpha__
525         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
526 #else
527         return 0;
528 #endif
529 }
530
531 EXPORT_SYMBOL(drm_core_get_reg_ofs);
532
533 /**
534  * mmap DMA memory.
535  *
536  * \param file_priv DRM file private.
537  * \param vma virtual memory area.
538  * \return zero on success or a negative number on failure.
539  *
540  * If the virtual memory area has no offset associated with it then it's a DMA
541  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
542  * checks that the restricted flag is not set, sets the virtual memory operations
543  * according to the mapping type and remaps the pages. Finally sets the file
544  * pointer and calls vm_open().
545  */
546 int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
547 {
548         struct drm_file *priv = filp->private_data;
549         struct drm_device *dev = priv->minor->dev;
550         struct drm_map *map = NULL;
551         unsigned long offset = 0;
552         struct drm_hash_item *hash;
553
554         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
555                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
556
557         if (!priv->authenticated)
558                 return -EACCES;
559
560         /* We check for "dma". On Apple's UniNorth, it's valid to have
561          * the AGP mapped at physical address 0
562          * --BenH.
563          */
564         if (!vma->vm_pgoff
565 #if __OS_HAS_AGP
566             && (!dev->agp
567                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
568 #endif
569             )
570                 return drm_mmap_dma(filp, vma);
571
572         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
573                 DRM_ERROR("Could not find map\n");
574                 return -EINVAL;
575         }
576
577         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
578         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
579                 return -EPERM;
580
581         /* Check for valid size. */
582         if (map->size < vma->vm_end - vma->vm_start)
583                 return -EINVAL;
584
585         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
586                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
587 #if defined(__i386__) || defined(__x86_64__)
588                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
589 #else
590                 /* Ye gads this is ugly.  With more thought
591                    we could move this up higher and use
592                    `protection_map' instead.  */
593                 vma->vm_page_prot =
594                     __pgprot(pte_val
595                              (pte_wrprotect
596                               (__pte(pgprot_val(vma->vm_page_prot)))));
597 #endif
598         }
599
600         switch (map->type) {
601         case _DRM_AGP:
602                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
603                         /*
604                          * On some platforms we can't talk to bus dma address from the CPU, so for
605                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
606                          * pages and mappings in fault()
607                          */
608 #if defined(__powerpc__)
609                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
610 #endif
611                         vma->vm_ops = &drm_vm_ops;
612                         break;
613                 }
614                 /* fall through to _DRM_FRAME_BUFFER... */
615         case _DRM_FRAME_BUFFER:
616         case _DRM_REGISTERS:
617                 offset = dev->driver->get_reg_ofs(dev);
618                 vma->vm_flags |= VM_IO; /* not in core dump */
619                 vma->vm_page_prot = drm_io_prot(map->type, vma);
620                 if (io_remap_pfn_range(vma, vma->vm_start,
621                                        (map->offset + offset) >> PAGE_SHIFT,
622                                        vma->vm_end - vma->vm_start,
623                                        vma->vm_page_prot))
624                         return -EAGAIN;
625                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
626                           " offset = 0x%lx\n",
627                           map->type,
628                           vma->vm_start, vma->vm_end, map->offset + offset);
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                 /* Don't let this area swap.  Change when
644                    DRM_KERNEL advisory is supported. */
645                 vma->vm_flags |= VM_RESERVED;
646                 break;
647         case _DRM_SCATTER_GATHER:
648                 vma->vm_ops = &drm_vm_sg_ops;
649                 vma->vm_private_data = (void *)map;
650                 vma->vm_flags |= VM_RESERVED;
651                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
652                 break;
653         default:
654                 return -EINVAL; /* This should never happen. */
655         }
656         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
657         vma->vm_flags |= VM_DONTEXPAND;
658
659         vma->vm_file = filp;    /* Needed for drm_vm_open() */
660         drm_vm_open_locked(vma);
661         return 0;
662 }
663
664 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
665 {
666         struct drm_file *priv = filp->private_data;
667         struct drm_device *dev = priv->minor->dev;
668         int ret;
669
670         mutex_lock(&dev->struct_mutex);
671         ret = drm_mmap_locked(filp, vma);
672         mutex_unlock(&dev->struct_mutex);
673
674         return ret;
675 }
676 EXPORT_SYMBOL(drm_mmap);