const: mark struct vm_struct_operations
[linux-2.6.git] / 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_local_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                 resource_size_t offset = (unsigned long)vmf->virtual_address -
119                         vma->vm_start;
120                 resource_size_t 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 = agpmem->memory->pages[offset];
148                 get_page(page);
149                 vmf->page = page;
150
151                 DRM_DEBUG
152                     ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
153                      (unsigned long long)baddr,
154                      agpmem->memory->pages[offset],
155                      (unsigned long long)offset,
156                      page_count(page));
157                 return 0;
158         }
159 vm_fault_error:
160         return VM_FAULT_SIGBUS; /* Disallow mremap */
161 }
162 #else                           /* __OS_HAS_AGP */
163 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
164 {
165         return VM_FAULT_SIGBUS;
166 }
167 #endif                          /* __OS_HAS_AGP */
168
169 /**
170  * \c nopage method for shared virtual memory.
171  *
172  * \param vma virtual memory area.
173  * \param address access address.
174  * \return pointer to the page structure.
175  *
176  * Get the mapping, find the real physical page to map, get the page, and
177  * return it.
178  */
179 static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
180 {
181         struct drm_local_map *map = vma->vm_private_data;
182         unsigned long offset;
183         unsigned long i;
184         struct page *page;
185
186         if (!map)
187                 return VM_FAULT_SIGBUS; /* Nothing allocated */
188
189         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
190         i = (unsigned long)map->handle + offset;
191         page = vmalloc_to_page((void *)i);
192         if (!page)
193                 return VM_FAULT_SIGBUS;
194         get_page(page);
195         vmf->page = page;
196
197         DRM_DEBUG("shm_fault 0x%lx\n", offset);
198         return 0;
199 }
200
201 /**
202  * \c close method for shared virtual memory.
203  *
204  * \param vma virtual memory area.
205  *
206  * Deletes map information if we are the last
207  * person to close a mapping and it's not in the global maplist.
208  */
209 static void drm_vm_shm_close(struct vm_area_struct *vma)
210 {
211         struct drm_file *priv = vma->vm_file->private_data;
212         struct drm_device *dev = priv->minor->dev;
213         struct drm_vma_entry *pt, *temp;
214         struct drm_local_map *map;
215         struct drm_map_list *r_list;
216         int found_maps = 0;
217
218         DRM_DEBUG("0x%08lx,0x%08lx\n",
219                   vma->vm_start, vma->vm_end - vma->vm_start);
220         atomic_dec(&dev->vma_count);
221
222         map = vma->vm_private_data;
223
224         mutex_lock(&dev->struct_mutex);
225         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
226                 if (pt->vma->vm_private_data == map)
227                         found_maps++;
228                 if (pt->vma == vma) {
229                         list_del(&pt->head);
230                         kfree(pt);
231                 }
232         }
233
234         /* We were the only map that was found */
235         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
236                 /* Check to see if we are in the maplist, if we are not, then
237                  * we delete this mappings information.
238                  */
239                 found_maps = 0;
240                 list_for_each_entry(r_list, &dev->maplist, head) {
241                         if (r_list->map == map)
242                                 found_maps++;
243                 }
244
245                 if (!found_maps) {
246                         drm_dma_handle_t dmah;
247
248                         switch (map->type) {
249                         case _DRM_REGISTERS:
250                         case _DRM_FRAME_BUFFER:
251                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
252                                         int retcode;
253                                         retcode = mtrr_del(map->mtrr,
254                                                            map->offset,
255                                                            map->size);
256                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
257                                 }
258                                 iounmap(map->handle);
259                                 break;
260                         case _DRM_SHM:
261                                 vfree(map->handle);
262                                 break;
263                         case _DRM_AGP:
264                         case _DRM_SCATTER_GATHER:
265                                 break;
266                         case _DRM_CONSISTENT:
267                                 dmah.vaddr = map->handle;
268                                 dmah.busaddr = map->offset;
269                                 dmah.size = map->size;
270                                 __drm_pci_free(dev, &dmah);
271                                 break;
272                         case _DRM_GEM:
273                                 DRM_ERROR("tried to rmmap GEM object\n");
274                                 break;
275                         }
276                         kfree(map);
277                 }
278         }
279         mutex_unlock(&dev->struct_mutex);
280 }
281
282 /**
283  * \c fault method for DMA virtual memory.
284  *
285  * \param vma virtual memory area.
286  * \param address access address.
287  * \return pointer to the page structure.
288  *
289  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
290  */
291 static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
292 {
293         struct drm_file *priv = vma->vm_file->private_data;
294         struct drm_device *dev = priv->minor->dev;
295         struct drm_device_dma *dma = dev->dma;
296         unsigned long offset;
297         unsigned long page_nr;
298         struct page *page;
299
300         if (!dma)
301                 return VM_FAULT_SIGBUS; /* Error */
302         if (!dma->pagelist)
303                 return VM_FAULT_SIGBUS; /* Nothing allocated */
304
305         offset = (unsigned long)vmf->virtual_address - vma->vm_start;   /* vm_[pg]off[set] should be 0 */
306         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
307         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
308
309         get_page(page);
310         vmf->page = page;
311
312         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
313         return 0;
314 }
315
316 /**
317  * \c fault method for scatter-gather virtual memory.
318  *
319  * \param vma virtual memory area.
320  * \param address access address.
321  * \return pointer to the page structure.
322  *
323  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
324  */
325 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
326 {
327         struct drm_local_map *map = vma->vm_private_data;
328         struct drm_file *priv = vma->vm_file->private_data;
329         struct drm_device *dev = priv->minor->dev;
330         struct drm_sg_mem *entry = dev->sg;
331         unsigned long offset;
332         unsigned long map_offset;
333         unsigned long page_offset;
334         struct page *page;
335
336         if (!entry)
337                 return VM_FAULT_SIGBUS; /* Error */
338         if (!entry->pagelist)
339                 return VM_FAULT_SIGBUS; /* Nothing allocated */
340
341         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
342         map_offset = map->offset - (unsigned long)dev->sg->virtual;
343         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
344         page = entry->pagelist[page_offset];
345         get_page(page);
346         vmf->page = page;
347
348         return 0;
349 }
350
351 static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
352 {
353         return drm_do_vm_fault(vma, vmf);
354 }
355
356 static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
357 {
358         return drm_do_vm_shm_fault(vma, vmf);
359 }
360
361 static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
362 {
363         return drm_do_vm_dma_fault(vma, vmf);
364 }
365
366 static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
367 {
368         return drm_do_vm_sg_fault(vma, vmf);
369 }
370
371 /** AGP virtual memory operations */
372 static const struct vm_operations_struct drm_vm_ops = {
373         .fault = drm_vm_fault,
374         .open = drm_vm_open,
375         .close = drm_vm_close,
376 };
377
378 /** Shared virtual memory operations */
379 static const struct vm_operations_struct drm_vm_shm_ops = {
380         .fault = drm_vm_shm_fault,
381         .open = drm_vm_open,
382         .close = drm_vm_shm_close,
383 };
384
385 /** DMA virtual memory operations */
386 static const struct vm_operations_struct drm_vm_dma_ops = {
387         .fault = drm_vm_dma_fault,
388         .open = drm_vm_open,
389         .close = drm_vm_close,
390 };
391
392 /** Scatter-gather virtual memory operations */
393 static const struct vm_operations_struct drm_vm_sg_ops = {
394         .fault = drm_vm_sg_fault,
395         .open = drm_vm_open,
396         .close = drm_vm_close,
397 };
398
399 /**
400  * \c open method for shared virtual memory.
401  *
402  * \param vma virtual memory area.
403  *
404  * Create a new drm_vma_entry structure as the \p vma private data entry and
405  * add it to drm_device::vmalist.
406  */
407 void drm_vm_open_locked(struct vm_area_struct *vma)
408 {
409         struct drm_file *priv = vma->vm_file->private_data;
410         struct drm_device *dev = priv->minor->dev;
411         struct drm_vma_entry *vma_entry;
412
413         DRM_DEBUG("0x%08lx,0x%08lx\n",
414                   vma->vm_start, vma->vm_end - vma->vm_start);
415         atomic_inc(&dev->vma_count);
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
425 static void drm_vm_open(struct vm_area_struct *vma)
426 {
427         struct drm_file *priv = vma->vm_file->private_data;
428         struct drm_device *dev = priv->minor->dev;
429
430         mutex_lock(&dev->struct_mutex);
431         drm_vm_open_locked(vma);
432         mutex_unlock(&dev->struct_mutex);
433 }
434
435 /**
436  * \c close method for all virtual memory types.
437  *
438  * \param vma virtual memory area.
439  *
440  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
441  * free it.
442  */
443 static void drm_vm_close(struct vm_area_struct *vma)
444 {
445         struct drm_file *priv = vma->vm_file->private_data;
446         struct drm_device *dev = priv->minor->dev;
447         struct drm_vma_entry *pt, *temp;
448
449         DRM_DEBUG("0x%08lx,0x%08lx\n",
450                   vma->vm_start, vma->vm_end - vma->vm_start);
451         atomic_dec(&dev->vma_count);
452
453         mutex_lock(&dev->struct_mutex);
454         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
455                 if (pt->vma == vma) {
456                         list_del(&pt->head);
457                         kfree(pt);
458                         break;
459                 }
460         }
461         mutex_unlock(&dev->struct_mutex);
462 }
463
464 /**
465  * mmap DMA memory.
466  *
467  * \param file_priv DRM file private.
468  * \param vma virtual memory area.
469  * \return zero on success or a negative number on failure.
470  *
471  * Sets the virtual memory area operations structure to vm_dma_ops, the file
472  * pointer, and calls vm_open().
473  */
474 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
475 {
476         struct drm_file *priv = filp->private_data;
477         struct drm_device *dev;
478         struct drm_device_dma *dma;
479         unsigned long length = vma->vm_end - vma->vm_start;
480
481         dev = priv->minor->dev;
482         dma = dev->dma;
483         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
484                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
485
486         /* Length must match exact page count */
487         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
488                 return -EINVAL;
489         }
490
491         if (!capable(CAP_SYS_ADMIN) &&
492             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
493                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
494 #if defined(__i386__) || defined(__x86_64__)
495                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
496 #else
497                 /* Ye gads this is ugly.  With more thought
498                    we could move this up higher and use
499                    `protection_map' instead.  */
500                 vma->vm_page_prot =
501                     __pgprot(pte_val
502                              (pte_wrprotect
503                               (__pte(pgprot_val(vma->vm_page_prot)))));
504 #endif
505         }
506
507         vma->vm_ops = &drm_vm_dma_ops;
508
509         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
510         vma->vm_flags |= VM_DONTEXPAND;
511
512         vma->vm_file = filp;    /* Needed for drm_vm_open() */
513         drm_vm_open_locked(vma);
514         return 0;
515 }
516
517 resource_size_t drm_core_get_map_ofs(struct drm_local_map * map)
518 {
519         return map->offset;
520 }
521
522 EXPORT_SYMBOL(drm_core_get_map_ofs);
523
524 resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
525 {
526 #ifdef __alpha__
527         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
528 #else
529         return 0;
530 #endif
531 }
532
533 EXPORT_SYMBOL(drm_core_get_reg_ofs);
534
535 /**
536  * mmap DMA memory.
537  *
538  * \param file_priv DRM file private.
539  * \param vma virtual memory area.
540  * \return zero on success or a negative number on failure.
541  *
542  * If the virtual memory area has no offset associated with it then it's a DMA
543  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
544  * checks that the restricted flag is not set, sets the virtual memory operations
545  * according to the mapping type and remaps the pages. Finally sets the file
546  * pointer and calls vm_open().
547  */
548 int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
549 {
550         struct drm_file *priv = filp->private_data;
551         struct drm_device *dev = priv->minor->dev;
552         struct drm_local_map *map = NULL;
553         resource_size_t offset = 0;
554         struct drm_hash_item *hash;
555
556         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
557                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
558
559         if (!priv->authenticated)
560                 return -EACCES;
561
562         /* We check for "dma". On Apple's UniNorth, it's valid to have
563          * the AGP mapped at physical address 0
564          * --BenH.
565          */
566         if (!vma->vm_pgoff
567 #if __OS_HAS_AGP
568             && (!dev->agp
569                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
570 #endif
571             )
572                 return drm_mmap_dma(filp, vma);
573
574         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
575                 DRM_ERROR("Could not find map\n");
576                 return -EINVAL;
577         }
578
579         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
580         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
581                 return -EPERM;
582
583         /* Check for valid size. */
584         if (map->size < vma->vm_end - vma->vm_start)
585                 return -EINVAL;
586
587         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
588                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
589 #if defined(__i386__) || defined(__x86_64__)
590                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
591 #else
592                 /* Ye gads this is ugly.  With more thought
593                    we could move this up higher and use
594                    `protection_map' instead.  */
595                 vma->vm_page_prot =
596                     __pgprot(pte_val
597                              (pte_wrprotect
598                               (__pte(pgprot_val(vma->vm_page_prot)))));
599 #endif
600         }
601
602         switch (map->type) {
603         case _DRM_AGP:
604                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
605                         /*
606                          * On some platforms we can't talk to bus dma address from the CPU, so for
607                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
608                          * pages and mappings in fault()
609                          */
610 #if defined(__powerpc__)
611                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
612 #endif
613                         vma->vm_ops = &drm_vm_ops;
614                         break;
615                 }
616                 /* fall through to _DRM_FRAME_BUFFER... */
617         case _DRM_FRAME_BUFFER:
618         case _DRM_REGISTERS:
619                 offset = dev->driver->get_reg_ofs(dev);
620                 vma->vm_flags |= VM_IO; /* not in core dump */
621                 vma->vm_page_prot = drm_io_prot(map->type, vma);
622                 if (io_remap_pfn_range(vma, vma->vm_start,
623                                        (map->offset + offset) >> PAGE_SHIFT,
624                                        vma->vm_end - vma->vm_start,
625                                        vma->vm_page_prot))
626                         return -EAGAIN;
627                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
628                           " offset = 0x%llx\n",
629                           map->type,
630                           vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
631                 vma->vm_ops = &drm_vm_ops;
632                 break;
633         case _DRM_CONSISTENT:
634                 /* Consistent memory is really like shared memory. But
635                  * it's allocated in a different way, so avoid fault */
636                 if (remap_pfn_range(vma, vma->vm_start,
637                     page_to_pfn(virt_to_page(map->handle)),
638                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
639                         return -EAGAIN;
640                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
641         /* fall through to _DRM_SHM */
642         case _DRM_SHM:
643                 vma->vm_ops = &drm_vm_shm_ops;
644                 vma->vm_private_data = (void *)map;
645                 /* Don't let this area swap.  Change when
646                    DRM_KERNEL advisory is supported. */
647                 vma->vm_flags |= VM_RESERVED;
648                 break;
649         case _DRM_SCATTER_GATHER:
650                 vma->vm_ops = &drm_vm_sg_ops;
651                 vma->vm_private_data = (void *)map;
652                 vma->vm_flags |= VM_RESERVED;
653                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
654                 break;
655         default:
656                 return -EINVAL; /* This should never happen. */
657         }
658         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
659         vma->vm_flags |= VM_DONTEXPAND;
660
661         vma->vm_file = filp;    /* Needed for drm_vm_open() */
662         drm_vm_open_locked(vma);
663         return 0;
664 }
665
666 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
667 {
668         struct drm_file *priv = filp->private_data;
669         struct drm_device *dev = priv->minor->dev;
670         int ret;
671
672         mutex_lock(&dev->struct_mutex);
673         ret = drm_mmap_locked(filp, vma);
674         mutex_unlock(&dev->struct_mutex);
675
676         return ret;
677 }
678 EXPORT_SYMBOL(drm_mmap);