Merge branch 'drm-patches' of master.kernel.org:/pub/scm/linux/kernel/git/airlied...
[sfrench/cifs-2.6.git] / drivers / char / 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 #endif
58 #if defined(__ia64__)
59         if (efi_range_is_wc(vma->vm_start, vma->vm_end -
60                                     vma->vm_start))
61                 tmp = pgprot_writecombine(tmp);
62         else
63                 tmp = pgprot_noncached(tmp);
64 #endif
65         return tmp;
66 }
67
68 /**
69  * \c nopage method for AGP virtual memory.
70  *
71  * \param vma virtual memory area.
72  * \param address access address.
73  * \return pointer to the page structure.
74  *
75  * Find the right map and if it's AGP memory find the real physical page to
76  * map, get the page, increment the use count and return it.
77  */
78 #if __OS_HAS_AGP
79 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
80                                                 unsigned long address)
81 {
82         drm_file_t *priv = vma->vm_file->private_data;
83         drm_device_t *dev = priv->head->dev;
84         drm_map_t *map = NULL;
85         drm_map_list_t *r_list;
86         drm_hash_item_t *hash;
87
88         /*
89          * Find the right map
90          */
91         if (!drm_core_has_AGP(dev))
92                 goto vm_nopage_error;
93
94         if (!dev->agp || !dev->agp->cant_use_aperture)
95                 goto vm_nopage_error;
96
97         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
98                 goto vm_nopage_error;
99
100         r_list = drm_hash_entry(hash, drm_map_list_t, hash);
101         map = r_list->map;
102
103         if (map && map->type == _DRM_AGP) {
104                 unsigned long offset = address - vma->vm_start;
105                 unsigned long baddr = map->offset + offset;
106                 struct drm_agp_mem *agpmem;
107                 struct page *page;
108
109 #ifdef __alpha__
110                 /*
111                  * Adjust to a bus-relative address
112                  */
113                 baddr -= dev->hose->mem_space->start;
114 #endif
115
116                 /*
117                  * It's AGP memory - find the real physical page to map
118                  */
119                 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
120                         if (agpmem->bound <= baddr &&
121                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
122                                 break;
123                 }
124
125                 if (!agpmem)
126                         goto vm_nopage_error;
127
128                 /*
129                  * Get the page, inc the use count, and return it
130                  */
131                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
132                 page = virt_to_page(__va(agpmem->memory->memory[offset]));
133                 get_page(page);
134
135                 DRM_DEBUG
136                     ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
137                      baddr, __va(agpmem->memory->memory[offset]), offset,
138                      page_count(page));
139
140                 return page;
141         }
142       vm_nopage_error:
143         return NOPAGE_SIGBUS;   /* Disallow mremap */
144 }
145 #else                           /* __OS_HAS_AGP */
146 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
147                                                 unsigned long address)
148 {
149         return NOPAGE_SIGBUS;
150 }
151 #endif                          /* __OS_HAS_AGP */
152
153 /**
154  * \c nopage method for shared virtual memory.
155  *
156  * \param vma virtual memory area.
157  * \param address access address.
158  * \return pointer to the page structure.
159  *
160  * Get the the mapping, find the real physical page to map, get the page, and
161  * return it.
162  */
163 static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
164                                                     unsigned long address)
165 {
166         drm_map_t *map = (drm_map_t *) vma->vm_private_data;
167         unsigned long offset;
168         unsigned long i;
169         struct page *page;
170
171         if (address > vma->vm_end)
172                 return NOPAGE_SIGBUS;   /* Disallow mremap */
173         if (!map)
174                 return NOPAGE_SIGBUS;   /* Nothing allocated */
175
176         offset = address - vma->vm_start;
177         i = (unsigned long)map->handle + offset;
178         page = vmalloc_to_page((void *)i);
179         if (!page)
180                 return NOPAGE_SIGBUS;
181         get_page(page);
182
183         DRM_DEBUG("shm_nopage 0x%lx\n", address);
184         return page;
185 }
186
187 /**
188  * \c close method for shared virtual memory.
189  *
190  * \param vma virtual memory area.
191  *
192  * Deletes map information if we are the last
193  * person to close a mapping and it's not in the global maplist.
194  */
195 static void drm_vm_shm_close(struct vm_area_struct *vma)
196 {
197         drm_file_t *priv = vma->vm_file->private_data;
198         drm_device_t *dev = priv->head->dev;
199         drm_vma_entry_t *pt, *prev, *next;
200         drm_map_t *map;
201         drm_map_list_t *r_list;
202         struct list_head *list;
203         int found_maps = 0;
204
205         DRM_DEBUG("0x%08lx,0x%08lx\n",
206                   vma->vm_start, vma->vm_end - vma->vm_start);
207         atomic_dec(&dev->vma_count);
208
209         map = vma->vm_private_data;
210
211         mutex_lock(&dev->struct_mutex);
212         for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
213                 next = pt->next;
214                 if (pt->vma->vm_private_data == map)
215                         found_maps++;
216                 if (pt->vma == vma) {
217                         if (prev) {
218                                 prev->next = pt->next;
219                         } else {
220                                 dev->vmalist = pt->next;
221                         }
222                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
223                 } else {
224                         prev = pt;
225                 }
226         }
227         /* We were the only map that was found */
228         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
229                 /* Check to see if we are in the maplist, if we are not, then
230                  * we delete this mappings information.
231                  */
232                 found_maps = 0;
233                 list = &dev->maplist->head;
234                 list_for_each(list, &dev->maplist->head) {
235                         r_list = list_entry(list, drm_map_list_t, head);
236                         if (r_list->map == map)
237                                 found_maps++;
238                 }
239
240                 if (!found_maps) {
241                         drm_dma_handle_t dmah;
242
243                         switch (map->type) {
244                         case _DRM_REGISTERS:
245                         case _DRM_FRAME_BUFFER:
246                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
247                                         int retcode;
248                                         retcode = mtrr_del(map->mtrr,
249                                                            map->offset,
250                                                            map->size);
251                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
252                                 }
253                                 iounmap(map->handle);
254                                 break;
255                         case _DRM_SHM:
256                                 vfree(map->handle);
257                                 break;
258                         case _DRM_AGP:
259                         case _DRM_SCATTER_GATHER:
260                                 break;
261                         case _DRM_CONSISTENT:
262                                 dmah.vaddr = map->handle;
263                                 dmah.busaddr = map->offset;
264                                 dmah.size = map->size;
265                                 __drm_pci_free(dev, &dmah);
266                                 break;
267                         }
268                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
269                 }
270         }
271         mutex_unlock(&dev->struct_mutex);
272 }
273
274 /**
275  * \c nopage method for DMA virtual memory.
276  *
277  * \param vma virtual memory area.
278  * \param address access address.
279  * \return pointer to the page structure.
280  *
281  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
282  */
283 static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
284                                                     unsigned long address)
285 {
286         drm_file_t *priv = vma->vm_file->private_data;
287         drm_device_t *dev = priv->head->dev;
288         drm_device_dma_t *dma = dev->dma;
289         unsigned long offset;
290         unsigned long page_nr;
291         struct page *page;
292
293         if (!dma)
294                 return NOPAGE_SIGBUS;   /* Error */
295         if (address > vma->vm_end)
296                 return NOPAGE_SIGBUS;   /* Disallow mremap */
297         if (!dma->pagelist)
298                 return NOPAGE_SIGBUS;   /* Nothing allocated */
299
300         offset = address - vma->vm_start;       /* vm_[pg]off[set] should be 0 */
301         page_nr = offset >> PAGE_SHIFT;
302         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
303
304         get_page(page);
305
306         DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
307         return page;
308 }
309
310 /**
311  * \c nopage method for scatter-gather virtual memory.
312  *
313  * \param vma virtual memory area.
314  * \param address access address.
315  * \return pointer to the page structure.
316  *
317  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
318  */
319 static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
320                                                    unsigned long address)
321 {
322         drm_map_t *map = (drm_map_t *) vma->vm_private_data;
323         drm_file_t *priv = vma->vm_file->private_data;
324         drm_device_t *dev = priv->head->dev;
325         drm_sg_mem_t *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 NOPAGE_SIGBUS;   /* Error */
333         if (address > vma->vm_end)
334                 return NOPAGE_SIGBUS;   /* Disallow mremap */
335         if (!entry->pagelist)
336                 return NOPAGE_SIGBUS;   /* Nothing allocated */
337
338         offset = address - vma->vm_start;
339         map_offset = map->offset - (unsigned long)dev->sg->virtual;
340         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
341         page = entry->pagelist[page_offset];
342         get_page(page);
343
344         return page;
345 }
346
347 static struct page *drm_vm_nopage(struct vm_area_struct *vma,
348                                   unsigned long address, int *type)
349 {
350         if (type)
351                 *type = VM_FAULT_MINOR;
352         return drm_do_vm_nopage(vma, address);
353 }
354
355 static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
356                                       unsigned long address, int *type)
357 {
358         if (type)
359                 *type = VM_FAULT_MINOR;
360         return drm_do_vm_shm_nopage(vma, address);
361 }
362
363 static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
364                                       unsigned long address, int *type)
365 {
366         if (type)
367                 *type = VM_FAULT_MINOR;
368         return drm_do_vm_dma_nopage(vma, address);
369 }
370
371 static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
372                                      unsigned long address, int *type)
373 {
374         if (type)
375                 *type = VM_FAULT_MINOR;
376         return drm_do_vm_sg_nopage(vma, address);
377 }
378
379 /** AGP virtual memory operations */
380 static struct vm_operations_struct drm_vm_ops = {
381         .nopage = drm_vm_nopage,
382         .open = drm_vm_open,
383         .close = drm_vm_close,
384 };
385
386 /** Shared virtual memory operations */
387 static struct vm_operations_struct drm_vm_shm_ops = {
388         .nopage = drm_vm_shm_nopage,
389         .open = drm_vm_open,
390         .close = drm_vm_shm_close,
391 };
392
393 /** DMA virtual memory operations */
394 static struct vm_operations_struct drm_vm_dma_ops = {
395         .nopage = drm_vm_dma_nopage,
396         .open = drm_vm_open,
397         .close = drm_vm_close,
398 };
399
400 /** Scatter-gather virtual memory operations */
401 static struct vm_operations_struct drm_vm_sg_ops = {
402         .nopage = drm_vm_sg_nopage,
403         .open = drm_vm_open,
404         .close = drm_vm_close,
405 };
406
407 /**
408  * \c open method for shared virtual memory.
409  *
410  * \param vma virtual memory area.
411  *
412  * Create a new drm_vma_entry structure as the \p vma private data entry and
413  * add it to drm_device::vmalist.
414  */
415 static void drm_vm_open_locked(struct vm_area_struct *vma)
416 {
417         drm_file_t *priv = vma->vm_file->private_data;
418         drm_device_t *dev = priv->head->dev;
419         drm_vma_entry_t *vma_entry;
420
421         DRM_DEBUG("0x%08lx,0x%08lx\n",
422                   vma->vm_start, vma->vm_end - vma->vm_start);
423         atomic_inc(&dev->vma_count);
424
425         vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
426         if (vma_entry) {
427                 vma_entry->vma = vma;
428                 vma_entry->next = dev->vmalist;
429                 vma_entry->pid = current->pid;
430                 dev->vmalist = vma_entry;
431         }
432 }
433
434 static void drm_vm_open(struct vm_area_struct *vma)
435 {
436         drm_file_t *priv = vma->vm_file->private_data;
437         drm_device_t *dev = priv->head->dev;
438
439         mutex_lock(&dev->struct_mutex);
440         drm_vm_open_locked(vma);
441         mutex_unlock(&dev->struct_mutex);
442 }
443
444 /**
445  * \c close method for all virtual memory types.
446  *
447  * \param vma virtual memory area.
448  *
449  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
450  * free it.
451  */
452 static void drm_vm_close(struct vm_area_struct *vma)
453 {
454         drm_file_t *priv = vma->vm_file->private_data;
455         drm_device_t *dev = priv->head->dev;
456         drm_vma_entry_t *pt, *prev;
457
458         DRM_DEBUG("0x%08lx,0x%08lx\n",
459                   vma->vm_start, vma->vm_end - vma->vm_start);
460         atomic_dec(&dev->vma_count);
461
462         mutex_lock(&dev->struct_mutex);
463         for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
464                 if (pt->vma == vma) {
465                         if (prev) {
466                                 prev->next = pt->next;
467                         } else {
468                                 dev->vmalist = pt->next;
469                         }
470                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
471                         break;
472                 }
473         }
474         mutex_unlock(&dev->struct_mutex);
475 }
476
477 /**
478  * mmap DMA memory.
479  *
480  * \param filp file pointer.
481  * \param vma virtual memory area.
482  * \return zero on success or a negative number on failure.
483  *
484  * Sets the virtual memory area operations structure to vm_dma_ops, the file
485  * pointer, and calls vm_open().
486  */
487 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
488 {
489         drm_file_t *priv = filp->private_data;
490         drm_device_t *dev;
491         drm_device_dma_t *dma;
492         unsigned long length = vma->vm_end - vma->vm_start;
493
494         dev = priv->head->dev;
495         dma = dev->dma;
496         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
497                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
498
499         /* Length must match exact page count */
500         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
501                 return -EINVAL;
502         }
503
504         if (!capable(CAP_SYS_ADMIN) &&
505             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
506                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
507 #if defined(__i386__) || defined(__x86_64__)
508                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
509 #else
510                 /* Ye gads this is ugly.  With more thought
511                    we could move this up higher and use
512                    `protection_map' instead.  */
513                 vma->vm_page_prot =
514                     __pgprot(pte_val
515                              (pte_wrprotect
516                               (__pte(pgprot_val(vma->vm_page_prot)))));
517 #endif
518         }
519
520         vma->vm_ops = &drm_vm_dma_ops;
521
522         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
523
524         vma->vm_file = filp;    /* Needed for drm_vm_open() */
525         drm_vm_open_locked(vma);
526         return 0;
527 }
528
529 unsigned long drm_core_get_map_ofs(drm_map_t * map)
530 {
531         return map->offset;
532 }
533
534 EXPORT_SYMBOL(drm_core_get_map_ofs);
535
536 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
537 {
538 #ifdef __alpha__
539         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
540 #else
541         return 0;
542 #endif
543 }
544
545 EXPORT_SYMBOL(drm_core_get_reg_ofs);
546
547 /**
548  * mmap DMA memory.
549  *
550  * \param filp file pointer.
551  * \param vma virtual memory area.
552  * \return zero on success or a negative number on failure.
553  *
554  * If the virtual memory area has no offset associated with it then it's a DMA
555  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
556  * checks that the restricted flag is not set, sets the virtual memory operations
557  * according to the mapping type and remaps the pages. Finally sets the file
558  * pointer and calls vm_open().
559  */
560 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
561 {
562         drm_file_t *priv = filp->private_data;
563         drm_device_t *dev = priv->head->dev;
564         drm_map_t *map = NULL;
565         unsigned long offset = 0;
566         drm_hash_item_t *hash;
567
568         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
569                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
570
571         if (!priv->authenticated)
572                 return -EACCES;
573
574         /* We check for "dma". On Apple's UniNorth, it's valid to have
575          * the AGP mapped at physical address 0
576          * --BenH.
577          */
578         if (!vma->vm_pgoff
579 #if __OS_HAS_AGP
580             && (!dev->agp
581                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
582 #endif
583             )
584                 return drm_mmap_dma(filp, vma);
585
586         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
587                 DRM_ERROR("Could not find map\n");
588                 return -EINVAL;
589         }
590
591         map = drm_hash_entry(hash, drm_map_list_t, hash)->map;
592         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
593                 return -EPERM;
594
595         /* Check for valid size. */
596         if (map->size < vma->vm_end - vma->vm_start)
597                 return -EINVAL;
598
599         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
600                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
601 #if defined(__i386__) || defined(__x86_64__)
602                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
603 #else
604                 /* Ye gads this is ugly.  With more thought
605                    we could move this up higher and use
606                    `protection_map' instead.  */
607                 vma->vm_page_prot =
608                     __pgprot(pte_val
609                              (pte_wrprotect
610                               (__pte(pgprot_val(vma->vm_page_prot)))));
611 #endif
612         }
613
614         switch (map->type) {
615         case _DRM_AGP:
616                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
617                         /*
618                          * On some platforms we can't talk to bus dma address from the CPU, so for
619                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
620                          * pages and mappings in nopage()
621                          */
622 #if defined(__powerpc__)
623                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
624 #endif
625                         vma->vm_ops = &drm_vm_ops;
626                         break;
627                 }
628                 /* fall through to _DRM_FRAME_BUFFER... */
629         case _DRM_FRAME_BUFFER:
630         case _DRM_REGISTERS:
631                 offset = dev->driver->get_reg_ofs(dev);
632                 vma->vm_flags |= VM_IO; /* not in core dump */
633                 vma->vm_page_prot = drm_io_prot(map->type, vma);
634 #ifdef __sparc__
635                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
636 #endif
637                 if (io_remap_pfn_range(vma, vma->vm_start,
638                                        (map->offset + offset) >> PAGE_SHIFT,
639                                        vma->vm_end - vma->vm_start,
640                                        vma->vm_page_prot))
641                         return -EAGAIN;
642                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
643                           " offset = 0x%lx\n",
644                           map->type,
645                           vma->vm_start, vma->vm_end, map->offset + offset);
646                 vma->vm_ops = &drm_vm_ops;
647                 break;
648         case _DRM_CONSISTENT:
649                 /* Consistent memory is really like shared memory. But
650                  * it's allocated in a different way, so avoid nopage */
651                 if (remap_pfn_range(vma, vma->vm_start,
652                     page_to_pfn(virt_to_page(map->handle)),
653                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
654                         return -EAGAIN;
655         /* fall through to _DRM_SHM */
656         case _DRM_SHM:
657                 vma->vm_ops = &drm_vm_shm_ops;
658                 vma->vm_private_data = (void *)map;
659                 /* Don't let this area swap.  Change when
660                    DRM_KERNEL advisory is supported. */
661                 vma->vm_flags |= VM_RESERVED;
662                 break;
663         case _DRM_SCATTER_GATHER:
664                 vma->vm_ops = &drm_vm_sg_ops;
665                 vma->vm_private_data = (void *)map;
666                 vma->vm_flags |= VM_RESERVED;
667                 break;
668         default:
669                 return -EINVAL; /* This should never happen. */
670         }
671         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
672
673         vma->vm_file = filp;    /* Needed for drm_vm_open() */
674         drm_vm_open_locked(vma);
675         return 0;
676 }
677
678 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
679 {
680         drm_file_t *priv = filp->private_data;
681         drm_device_t *dev = priv->head->dev;
682         int ret;
683
684         mutex_lock(&dev->struct_mutex);
685         ret = drm_mmap_locked(filp, vma);
686         mutex_unlock(&dev->struct_mutex);
687
688         return ret;
689 }
690 EXPORT_SYMBOL(drm_mmap);