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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->head->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->head->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                         }
271                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
272                 }
273         }
274         mutex_unlock(&dev->struct_mutex);
275 }
276
277 /**
278  * \c fault method for DMA virtual memory.
279  *
280  * \param vma virtual memory area.
281  * \param address access address.
282  * \return pointer to the page structure.
283  *
284  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
285  */
286 static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
287 {
288         struct drm_file *priv = vma->vm_file->private_data;
289         struct drm_device *dev = priv->head->dev;
290         struct drm_device_dma *dma = dev->dma;
291         unsigned long offset;
292         unsigned long page_nr;
293         struct page *page;
294
295         if (!dma)
296                 return VM_FAULT_SIGBUS; /* Error */
297         if (!dma->pagelist)
298                 return VM_FAULT_SIGBUS; /* Nothing allocated */
299
300         offset = (unsigned long)vmf->virtual_address - vma->vm_start;   /* vm_[pg]off[set] should be 0 */
301         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
302         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
303
304         get_page(page);
305         vmf->page = page;
306
307         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
308         return 0;
309 }
310
311 /**
312  * \c fault method for scatter-gather virtual memory.
313  *
314  * \param vma virtual memory area.
315  * \param address access address.
316  * \return pointer to the page structure.
317  *
318  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
319  */
320 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
321 {
322         struct drm_map *map = (struct drm_map *) vma->vm_private_data;
323         struct drm_file *priv = vma->vm_file->private_data;
324         struct drm_device *dev = priv->head->dev;
325         struct drm_sg_mem *entry = dev->sg;
326         unsigned long offset;
327         unsigned long map_offset;
328         unsigned long page_offset;
329         struct page *page;
330
331         if (!entry)
332                 return VM_FAULT_SIGBUS; /* Error */
333         if (!entry->pagelist)
334                 return VM_FAULT_SIGBUS; /* Nothing allocated */
335
336         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
337         map_offset = map->offset - (unsigned long)dev->sg->virtual;
338         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
339         page = entry->pagelist[page_offset];
340         get_page(page);
341         vmf->page = page;
342
343         return 0;
344 }
345
346 static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
347 {
348         return drm_do_vm_fault(vma, vmf);
349 }
350
351 static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
352 {
353         return drm_do_vm_shm_fault(vma, vmf);
354 }
355
356 static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
357 {
358         return drm_do_vm_dma_fault(vma, vmf);
359 }
360
361 static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
362 {
363         return drm_do_vm_sg_fault(vma, vmf);
364 }
365
366 /** AGP virtual memory operations */
367 static struct vm_operations_struct drm_vm_ops = {
368         .fault = drm_vm_fault,
369         .open = drm_vm_open,
370         .close = drm_vm_close,
371 };
372
373 /** Shared virtual memory operations */
374 static struct vm_operations_struct drm_vm_shm_ops = {
375         .fault = drm_vm_shm_fault,
376         .open = drm_vm_open,
377         .close = drm_vm_shm_close,
378 };
379
380 /** DMA virtual memory operations */
381 static struct vm_operations_struct drm_vm_dma_ops = {
382         .fault = drm_vm_dma_fault,
383         .open = drm_vm_open,
384         .close = drm_vm_close,
385 };
386
387 /** Scatter-gather virtual memory operations */
388 static struct vm_operations_struct drm_vm_sg_ops = {
389         .fault = drm_vm_sg_fault,
390         .open = drm_vm_open,
391         .close = drm_vm_close,
392 };
393
394 /**
395  * \c open method for shared virtual memory.
396  *
397  * \param vma virtual memory area.
398  *
399  * Create a new drm_vma_entry structure as the \p vma private data entry and
400  * add it to drm_device::vmalist.
401  */
402 static void drm_vm_open_locked(struct vm_area_struct *vma)
403 {
404         struct drm_file *priv = vma->vm_file->private_data;
405         struct drm_device *dev = priv->head->dev;
406         struct drm_vma_entry *vma_entry;
407
408         DRM_DEBUG("0x%08lx,0x%08lx\n",
409                   vma->vm_start, vma->vm_end - vma->vm_start);
410         atomic_inc(&dev->vma_count);
411
412         vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
413         if (vma_entry) {
414                 vma_entry->vma = vma;
415                 vma_entry->pid = current->pid;
416                 list_add(&vma_entry->head, &dev->vmalist);
417         }
418 }
419
420 static void drm_vm_open(struct vm_area_struct *vma)
421 {
422         struct drm_file *priv = vma->vm_file->private_data;
423         struct drm_device *dev = priv->head->dev;
424
425         mutex_lock(&dev->struct_mutex);
426         drm_vm_open_locked(vma);
427         mutex_unlock(&dev->struct_mutex);
428 }
429
430 /**
431  * \c close method for all virtual memory types.
432  *
433  * \param vma virtual memory area.
434  *
435  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
436  * free it.
437  */
438 static void drm_vm_close(struct vm_area_struct *vma)
439 {
440         struct drm_file *priv = vma->vm_file->private_data;
441         struct drm_device *dev = priv->head->dev;
442         struct drm_vma_entry *pt, *temp;
443
444         DRM_DEBUG("0x%08lx,0x%08lx\n",
445                   vma->vm_start, vma->vm_end - vma->vm_start);
446         atomic_dec(&dev->vma_count);
447
448         mutex_lock(&dev->struct_mutex);
449         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
450                 if (pt->vma == vma) {
451                         list_del(&pt->head);
452                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
453                         break;
454                 }
455         }
456         mutex_unlock(&dev->struct_mutex);
457 }
458
459 /**
460  * mmap DMA memory.
461  *
462  * \param file_priv DRM file private.
463  * \param vma virtual memory area.
464  * \return zero on success or a negative number on failure.
465  *
466  * Sets the virtual memory area operations structure to vm_dma_ops, the file
467  * pointer, and calls vm_open().
468  */
469 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
470 {
471         struct drm_file *priv = filp->private_data;
472         struct drm_device *dev;
473         struct drm_device_dma *dma;
474         unsigned long length = vma->vm_end - vma->vm_start;
475
476         dev = priv->head->dev;
477         dma = dev->dma;
478         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
479                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
480
481         /* Length must match exact page count */
482         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
483                 return -EINVAL;
484         }
485
486         if (!capable(CAP_SYS_ADMIN) &&
487             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
488                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
489 #if defined(__i386__) || defined(__x86_64__)
490                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
491 #else
492                 /* Ye gads this is ugly.  With more thought
493                    we could move this up higher and use
494                    `protection_map' instead.  */
495                 vma->vm_page_prot =
496                     __pgprot(pte_val
497                              (pte_wrprotect
498                               (__pte(pgprot_val(vma->vm_page_prot)))));
499 #endif
500         }
501
502         vma->vm_ops = &drm_vm_dma_ops;
503
504         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
505         vma->vm_flags |= VM_DONTEXPAND;
506
507         vma->vm_file = filp;    /* Needed for drm_vm_open() */
508         drm_vm_open_locked(vma);
509         return 0;
510 }
511
512 unsigned long drm_core_get_map_ofs(struct drm_map * map)
513 {
514         return map->offset;
515 }
516
517 EXPORT_SYMBOL(drm_core_get_map_ofs);
518
519 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
520 {
521 #ifdef __alpha__
522         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
523 #else
524         return 0;
525 #endif
526 }
527
528 EXPORT_SYMBOL(drm_core_get_reg_ofs);
529
530 /**
531  * mmap DMA memory.
532  *
533  * \param file_priv DRM file private.
534  * \param vma virtual memory area.
535  * \return zero on success or a negative number on failure.
536  *
537  * If the virtual memory area has no offset associated with it then it's a DMA
538  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
539  * checks that the restricted flag is not set, sets the virtual memory operations
540  * according to the mapping type and remaps the pages. Finally sets the file
541  * pointer and calls vm_open().
542  */
543 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
544 {
545         struct drm_file *priv = filp->private_data;
546         struct drm_device *dev = priv->head->dev;
547         struct drm_map *map = NULL;
548         unsigned long offset = 0;
549         struct drm_hash_item *hash;
550
551         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
552                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
553
554         if (!priv->authenticated)
555                 return -EACCES;
556
557         /* We check for "dma". On Apple's UniNorth, it's valid to have
558          * the AGP mapped at physical address 0
559          * --BenH.
560          */
561         if (!vma->vm_pgoff
562 #if __OS_HAS_AGP
563             && (!dev->agp
564                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
565 #endif
566             )
567                 return drm_mmap_dma(filp, vma);
568
569         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
570                 DRM_ERROR("Could not find map\n");
571                 return -EINVAL;
572         }
573
574         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
575         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
576                 return -EPERM;
577
578         /* Check for valid size. */
579         if (map->size < vma->vm_end - vma->vm_start)
580                 return -EINVAL;
581
582         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
583                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
584 #if defined(__i386__) || defined(__x86_64__)
585                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
586 #else
587                 /* Ye gads this is ugly.  With more thought
588                    we could move this up higher and use
589                    `protection_map' instead.  */
590                 vma->vm_page_prot =
591                     __pgprot(pte_val
592                              (pte_wrprotect
593                               (__pte(pgprot_val(vma->vm_page_prot)))));
594 #endif
595         }
596
597         switch (map->type) {
598         case _DRM_AGP:
599                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
600                         /*
601                          * On some platforms we can't talk to bus dma address from the CPU, so for
602                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
603                          * pages and mappings in fault()
604                          */
605 #if defined(__powerpc__)
606                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
607 #endif
608                         vma->vm_ops = &drm_vm_ops;
609                         break;
610                 }
611                 /* fall through to _DRM_FRAME_BUFFER... */
612         case _DRM_FRAME_BUFFER:
613         case _DRM_REGISTERS:
614                 offset = dev->driver->get_reg_ofs(dev);
615                 vma->vm_flags |= VM_IO; /* not in core dump */
616                 vma->vm_page_prot = drm_io_prot(map->type, vma);
617                 if (io_remap_pfn_range(vma, vma->vm_start,
618                                        (map->offset + offset) >> PAGE_SHIFT,
619                                        vma->vm_end - vma->vm_start,
620                                        vma->vm_page_prot))
621                         return -EAGAIN;
622                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
623                           " offset = 0x%lx\n",
624                           map->type,
625                           vma->vm_start, vma->vm_end, map->offset + offset);
626                 vma->vm_ops = &drm_vm_ops;
627                 break;
628         case _DRM_CONSISTENT:
629                 /* Consistent memory is really like shared memory. But
630                  * it's allocated in a different way, so avoid fault */
631                 if (remap_pfn_range(vma, vma->vm_start,
632                     page_to_pfn(virt_to_page(map->handle)),
633                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
634                         return -EAGAIN;
635                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
636         /* fall through to _DRM_SHM */
637         case _DRM_SHM:
638                 vma->vm_ops = &drm_vm_shm_ops;
639                 vma->vm_private_data = (void *)map;
640                 /* Don't let this area swap.  Change when
641                    DRM_KERNEL advisory is supported. */
642                 vma->vm_flags |= VM_RESERVED;
643                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
644                 break;
645         case _DRM_SCATTER_GATHER:
646                 vma->vm_ops = &drm_vm_sg_ops;
647                 vma->vm_private_data = (void *)map;
648                 vma->vm_flags |= VM_RESERVED;
649                 break;
650         default:
651                 return -EINVAL; /* This should never happen. */
652         }
653         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
654         vma->vm_flags |= VM_DONTEXPAND;
655
656         vma->vm_file = filp;    /* Needed for drm_vm_open() */
657         drm_vm_open_locked(vma);
658         return 0;
659 }
660
661 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
662 {
663         struct drm_file *priv = filp->private_data;
664         struct drm_device *dev = priv->head->dev;
665         int ret;
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);