Linux-2.6.12-rc2
[linux-2.6.git] / drivers / char / drm / drm_vm.c
1 /**
2  * \file drm_vm.h
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
42 /**
43  * \c nopage method for AGP virtual memory.
44  *
45  * \param vma virtual memory area.
46  * \param address access address.
47  * \return pointer to the page structure.
48  * 
49  * Find the right map and if it's AGP memory find the real physical page to
50  * map, get the page, increment the use count and return it.
51  */
52 #if __OS_HAS_AGP
53 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
54                                                  unsigned long address)
55 {
56         drm_file_t *priv  = vma->vm_file->private_data;
57         drm_device_t *dev = priv->head->dev;
58         drm_map_t *map    = NULL;
59         drm_map_list_t  *r_list;
60         struct list_head *list;
61
62         /*
63          * Find the right map
64          */
65         if (!drm_core_has_AGP(dev))
66                 goto vm_nopage_error;
67
68         if(!dev->agp || !dev->agp->cant_use_aperture) goto vm_nopage_error;
69
70         list_for_each(list, &dev->maplist->head) {
71                 r_list = list_entry(list, drm_map_list_t, head);
72                 map = r_list->map;
73                 if (!map) continue;
74                 if (map->offset == VM_OFFSET(vma)) break;
75         }
76
77         if (map && map->type == _DRM_AGP) {
78                 unsigned long offset = address - vma->vm_start;
79                 unsigned long baddr = VM_OFFSET(vma) + offset;
80                 struct drm_agp_mem *agpmem;
81                 struct page *page;
82
83 #ifdef __alpha__
84                 /*
85                  * Adjust to a bus-relative address
86                  */
87                 baddr -= dev->hose->mem_space->start;
88 #endif
89
90                 /*
91                  * It's AGP memory - find the real physical page to map
92                  */
93                 for(agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
94                         if (agpmem->bound <= baddr &&
95                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) 
96                                 break;
97                 }
98
99                 if (!agpmem) goto vm_nopage_error;
100
101                 /*
102                  * Get the page, inc the use count, and return it
103                  */
104                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
105                 page = virt_to_page(__va(agpmem->memory->memory[offset]));
106                 get_page(page);
107
108                 DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
109                           baddr, __va(agpmem->memory->memory[offset]), offset,
110                           page_count(page));
111
112                 return page;
113         }
114 vm_nopage_error:
115         return NOPAGE_SIGBUS;           /* Disallow mremap */
116 }
117 #else /* __OS_HAS_AGP */
118 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
119                                                  unsigned long address)
120 {
121         return NOPAGE_SIGBUS;
122 }
123 #endif /* __OS_HAS_AGP */
124
125 /**
126  * \c nopage method for shared virtual memory.
127  *
128  * \param vma virtual memory area.
129  * \param address access address.
130  * \return pointer to the page structure.
131  * 
132  * Get the the mapping, find the real physical page to map, get the page, and
133  * return it.
134  */
135 static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
136                                                      unsigned long address)
137 {
138         drm_map_t        *map    = (drm_map_t *)vma->vm_private_data;
139         unsigned long    offset;
140         unsigned long    i;
141         struct page      *page;
142
143         if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
144         if (!map)                  return NOPAGE_OOM;  /* Nothing allocated */
145
146         offset   = address - vma->vm_start;
147         i = (unsigned long)map->handle + offset;
148         page = vmalloc_to_page((void *)i);
149         if (!page)
150                 return NOPAGE_OOM;
151         get_page(page);
152
153         DRM_DEBUG("shm_nopage 0x%lx\n", address);
154         return page;
155 }
156
157
158 /**
159  * \c close method for shared virtual memory.
160  * 
161  * \param vma virtual memory area.
162  * 
163  * Deletes map information if we are the last
164  * person to close a mapping and it's not in the global maplist.
165  */
166 void drm_vm_shm_close(struct vm_area_struct *vma)
167 {
168         drm_file_t      *priv   = vma->vm_file->private_data;
169         drm_device_t    *dev    = priv->head->dev;
170         drm_vma_entry_t *pt, *prev, *next;
171         drm_map_t *map;
172         drm_map_list_t *r_list;
173         struct list_head *list;
174         int found_maps = 0;
175
176         DRM_DEBUG("0x%08lx,0x%08lx\n",
177                   vma->vm_start, vma->vm_end - vma->vm_start);
178         atomic_dec(&dev->vma_count);
179
180         map = vma->vm_private_data;
181
182         down(&dev->struct_sem);
183         for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
184                 next = pt->next;
185                 if (pt->vma->vm_private_data == map) found_maps++;
186                 if (pt->vma == vma) {
187                         if (prev) {
188                                 prev->next = pt->next;
189                         } else {
190                                 dev->vmalist = pt->next;
191                         }
192                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
193                 } else {
194                         prev = pt;
195                 }
196         }
197         /* We were the only map that was found */
198         if(found_maps == 1 &&
199            map->flags & _DRM_REMOVABLE) {
200                 /* Check to see if we are in the maplist, if we are not, then
201                  * we delete this mappings information.
202                  */
203                 found_maps = 0;
204                 list = &dev->maplist->head;
205                 list_for_each(list, &dev->maplist->head) {
206                         r_list = list_entry(list, drm_map_list_t, head);
207                         if (r_list->map == map) found_maps++;
208                 }
209
210                 if(!found_maps) {
211                         switch (map->type) {
212                         case _DRM_REGISTERS:
213                         case _DRM_FRAME_BUFFER:
214                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
215                                         int retcode;
216                                         retcode = mtrr_del(map->mtrr,
217                                                            map->offset,
218                                                            map->size);
219                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
220                                 }
221                                 drm_ioremapfree(map->handle, map->size, dev);
222                                 break;
223                         case _DRM_SHM:
224                                 vfree(map->handle);
225                                 break;
226                         case _DRM_AGP:
227                         case _DRM_SCATTER_GATHER:
228                                 break;
229                         }
230                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
231                 }
232         }
233         up(&dev->struct_sem);
234 }
235
236 /**
237  * \c nopage method for DMA virtual memory.
238  *
239  * \param vma virtual memory area.
240  * \param address access address.
241  * \return pointer to the page structure.
242  * 
243  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
244  */
245 static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
246                                                      unsigned long address)
247 {
248         drm_file_t       *priv   = vma->vm_file->private_data;
249         drm_device_t     *dev    = priv->head->dev;
250         drm_device_dma_t *dma    = dev->dma;
251         unsigned long    offset;
252         unsigned long    page_nr;
253         struct page      *page;
254
255         if (!dma)                  return NOPAGE_SIGBUS; /* Error */
256         if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
257         if (!dma->pagelist)        return NOPAGE_OOM ; /* Nothing allocated */
258
259         offset   = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
260         page_nr  = offset >> PAGE_SHIFT;
261         page = virt_to_page((dma->pagelist[page_nr] + 
262                              (offset & (~PAGE_MASK))));
263
264         get_page(page);
265
266         DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
267         return page;
268 }
269
270 /**
271  * \c nopage method for scatter-gather virtual memory.
272  *
273  * \param vma virtual memory area.
274  * \param address access address.
275  * \return pointer to the page structure.
276  * 
277  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
278  */
279 static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
280                                                     unsigned long address)
281 {
282         drm_map_t        *map    = (drm_map_t *)vma->vm_private_data;
283         drm_file_t *priv = vma->vm_file->private_data;
284         drm_device_t *dev = priv->head->dev;
285         drm_sg_mem_t *entry = dev->sg;
286         unsigned long offset;
287         unsigned long map_offset;
288         unsigned long page_offset;
289         struct page *page;
290
291         if (!entry)                return NOPAGE_SIGBUS; /* Error */
292         if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
293         if (!entry->pagelist)      return NOPAGE_OOM ;  /* Nothing allocated */
294
295
296         offset = address - vma->vm_start;
297         map_offset = map->offset - dev->sg->handle;
298         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
299         page = entry->pagelist[page_offset];
300         get_page(page);
301
302         return page;
303 }
304
305
306 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
307
308 static struct page *drm_vm_nopage(struct vm_area_struct *vma,
309                                    unsigned long address,
310                                    int *type) {
311         if (type) *type = VM_FAULT_MINOR;
312         return drm_do_vm_nopage(vma, address);
313 }
314
315 static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
316                                        unsigned long address,
317                                        int *type) {
318         if (type) *type = VM_FAULT_MINOR;
319         return drm_do_vm_shm_nopage(vma, address);
320 }
321
322 static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
323                                        unsigned long address,
324                                        int *type) {
325         if (type) *type = VM_FAULT_MINOR;
326         return drm_do_vm_dma_nopage(vma, address);
327 }
328
329 static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
330                                       unsigned long address,
331                                       int *type) {
332         if (type) *type = VM_FAULT_MINOR;
333         return drm_do_vm_sg_nopage(vma, address);
334 }
335
336 #else   /* LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,0) */
337
338 static struct page *drm_vm_nopage(struct vm_area_struct *vma,
339                                    unsigned long address,
340                                    int unused) {
341         return drm_do_vm_nopage(vma, address);
342 }
343
344 static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
345                                        unsigned long address,
346                                        int unused) {
347         return drm_do_vm_shm_nopage(vma, address);
348 }
349
350 static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
351                                        unsigned long address,
352                                        int unused) {
353         return drm_do_vm_dma_nopage(vma, address);
354 }
355
356 static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
357                                       unsigned long address,
358                                       int unused) {
359         return drm_do_vm_sg_nopage(vma, address);
360 }
361
362 #endif
363
364
365 /** AGP virtual memory operations */
366 static struct vm_operations_struct   drm_vm_ops = {
367         .nopage = drm_vm_nopage,
368         .open   = drm_vm_open,
369         .close  = drm_vm_close,
370 };
371
372 /** Shared virtual memory operations */
373 static struct vm_operations_struct   drm_vm_shm_ops = {
374         .nopage = drm_vm_shm_nopage,
375         .open   = drm_vm_open,
376         .close  = drm_vm_shm_close,
377 };
378
379 /** DMA virtual memory operations */
380 static struct vm_operations_struct   drm_vm_dma_ops = {
381         .nopage = drm_vm_dma_nopage,
382         .open   = drm_vm_open,
383         .close  = drm_vm_close,
384 };
385
386 /** Scatter-gather virtual memory operations */
387 static struct vm_operations_struct   drm_vm_sg_ops = {
388         .nopage = drm_vm_sg_nopage,
389         .open   = drm_vm_open,
390         .close  = drm_vm_close,
391 };
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 void drm_vm_open(struct vm_area_struct *vma)
403 {
404         drm_file_t      *priv   = vma->vm_file->private_data;
405         drm_device_t    *dev    = priv->head->dev;
406         drm_vma_entry_t *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                 down(&dev->struct_sem);
415                 vma_entry->vma  = vma;
416                 vma_entry->next = dev->vmalist;
417                 vma_entry->pid  = current->pid;
418                 dev->vmalist    = vma_entry;
419                 up(&dev->struct_sem);
420         }
421 }
422
423 /**
424  * \c close method for all virtual memory types.
425  * 
426  * \param vma virtual memory area.
427  * 
428  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
429  * free it.
430  */
431 void drm_vm_close(struct vm_area_struct *vma)
432 {
433         drm_file_t      *priv   = vma->vm_file->private_data;
434         drm_device_t    *dev    = priv->head->dev;
435         drm_vma_entry_t *pt, *prev;
436
437         DRM_DEBUG("0x%08lx,0x%08lx\n",
438                   vma->vm_start, vma->vm_end - vma->vm_start);
439         atomic_dec(&dev->vma_count);
440
441         down(&dev->struct_sem);
442         for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
443                 if (pt->vma == vma) {
444                         if (prev) {
445                                 prev->next = pt->next;
446                         } else {
447                                 dev->vmalist = pt->next;
448                         }
449                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
450                         break;
451                 }
452         }
453         up(&dev->struct_sem);
454 }
455
456 /**
457  * mmap DMA memory.
458  *
459  * \param filp file pointer.
460  * \param vma virtual memory area.
461  * \return zero on success or a negative number on failure.
462  * 
463  * Sets the virtual memory area operations structure to vm_dma_ops, the file
464  * pointer, and calls vm_open().
465  */
466 int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
467 {
468         drm_file_t       *priv   = filp->private_data;
469         drm_device_t     *dev;
470         drm_device_dma_t *dma;
471         unsigned long    length  = vma->vm_end - vma->vm_start;
472
473         lock_kernel();
474         dev      = priv->head->dev;
475         dma      = dev->dma;
476         DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
477                   vma->vm_start, vma->vm_end, VM_OFFSET(vma));
478
479                                 /* Length must match exact page count */
480         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
481                 unlock_kernel();
482                 return -EINVAL;
483         }
484         unlock_kernel();
485
486         vma->vm_ops   = &drm_vm_dma_ops;
487
488 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
489         vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
490 #else
491         vma->vm_flags |= VM_RESERVED; /* Don't swap */
492 #endif
493
494         vma->vm_file  =  filp;  /* Needed for drm_vm_open() */
495         drm_vm_open(vma);
496         return 0;
497 }
498
499 unsigned long drm_core_get_map_ofs(drm_map_t *map)
500 {
501         return map->offset;
502 }
503 EXPORT_SYMBOL(drm_core_get_map_ofs);
504
505 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
506 {
507 #ifdef __alpha__
508         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
509 #else
510         return 0;
511 #endif
512 }
513 EXPORT_SYMBOL(drm_core_get_reg_ofs);
514
515 /**
516  * mmap DMA memory.
517  *
518  * \param filp file pointer.
519  * \param vma virtual memory area.
520  * \return zero on success or a negative number on failure.
521  * 
522  * If the virtual memory area has no offset associated with it then it's a DMA
523  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
524  * checks that the restricted flag is not set, sets the virtual memory operations
525  * according to the mapping type and remaps the pages. Finally sets the file
526  * pointer and calls vm_open().
527  */
528 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
529 {
530         drm_file_t      *priv   = filp->private_data;
531         drm_device_t    *dev    = priv->head->dev;
532         drm_map_t       *map    = NULL;
533         drm_map_list_t  *r_list;
534         unsigned long   offset  = 0;
535         struct list_head *list;
536
537         DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
538                   vma->vm_start, vma->vm_end, VM_OFFSET(vma));
539
540         if ( !priv->authenticated ) return -EACCES;
541
542         /* We check for "dma". On Apple's UniNorth, it's valid to have
543          * the AGP mapped at physical address 0
544          * --BenH.
545          */
546         if (!VM_OFFSET(vma)
547 #if __OS_HAS_AGP
548             && (!dev->agp || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
549 #endif
550             )
551                 return drm_mmap_dma(filp, vma);
552
553                                 /* A sequential search of a linked list is
554                                    fine here because: 1) there will only be
555                                    about 5-10 entries in the list and, 2) a
556                                    DRI client only has to do this mapping
557                                    once, so it doesn't have to be optimized
558                                    for performance, even if the list was a
559                                    bit longer. */
560         list_for_each(list, &dev->maplist->head) {
561                 unsigned long off;
562
563                 r_list = list_entry(list, drm_map_list_t, head);
564                 map = r_list->map;
565                 if (!map) continue;
566                 off = dev->driver->get_map_ofs(map);
567                 if (off == VM_OFFSET(vma)) break;
568         }
569
570         if (!map || ((map->flags&_DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
571                 return -EPERM;
572
573                                 /* Check for valid size. */
574         if (map->size != vma->vm_end - vma->vm_start) return -EINVAL;
575
576         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
577                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
578 #if defined(__i386__) || defined(__x86_64__)
579                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
580 #else
581                                 /* Ye gads this is ugly.  With more thought
582                                    we could move this up higher and use
583                                    `protection_map' instead.  */
584                 vma->vm_page_prot = __pgprot(pte_val(pte_wrprotect(
585                         __pte(pgprot_val(vma->vm_page_prot)))));
586 #endif
587         }
588
589         switch (map->type) {
590         case _DRM_AGP:
591           if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
592                 /*
593                  * On some platforms we can't talk to bus dma address from the CPU, so for
594                  * memory of type DRM_AGP, we'll deal with sorting out the real physical
595                  * pages and mappings in nopage()
596                  */
597 #if defined(__powerpc__)
598                 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
599 #endif
600                 vma->vm_ops = &drm_vm_ops;
601                 break;
602           }
603                 /* fall through to _DRM_FRAME_BUFFER... */        
604         case _DRM_FRAME_BUFFER:
605         case _DRM_REGISTERS:
606                 if (VM_OFFSET(vma) >= __pa(high_memory)) {
607 #if defined(__i386__) || defined(__x86_64__)
608                         if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {
609                                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
610                                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
611                         }
612 #elif defined(__powerpc__)
613                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE | _PAGE_GUARDED;
614 #endif
615                         vma->vm_flags |= VM_IO; /* not in core dump */
616                 }
617 #if defined(__ia64__)
618                 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
619                                     vma->vm_start))
620                         vma->vm_page_prot =
621                                 pgprot_writecombine(vma->vm_page_prot);
622                 else
623                         vma->vm_page_prot =
624                                 pgprot_noncached(vma->vm_page_prot);
625 #endif
626                 offset = dev->driver->get_reg_ofs(dev);
627 #ifdef __sparc__
628                 if (io_remap_pfn_range(DRM_RPR_ARG(vma) vma->vm_start,
629                                         (VM_OFFSET(vma) + offset) >> PAGE_SHIFT,
630                                         vma->vm_end - vma->vm_start,
631                                         vma->vm_page_prot))
632 #else
633                 if (io_remap_pfn_range(vma, vma->vm_start,
634                                      (VM_OFFSET(vma) + offset) >> PAGE_SHIFT,
635                                      vma->vm_end - vma->vm_start,
636                                      vma->vm_page_prot))
637 #endif
638                                 return -EAGAIN;
639                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
640                           " offset = 0x%lx\n",
641                           map->type,
642                           vma->vm_start, vma->vm_end, VM_OFFSET(vma) + offset);
643                 vma->vm_ops = &drm_vm_ops;
644                 break;
645         case _DRM_SHM:
646                 vma->vm_ops = &drm_vm_shm_ops;
647                 vma->vm_private_data = (void *)map;
648                                 /* Don't let this area swap.  Change when
649                                    DRM_KERNEL advisory is supported. */
650 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
651                 vma->vm_flags |= VM_LOCKED;
652 #else
653                 vma->vm_flags |= VM_RESERVED;
654 #endif
655                 break;
656         case _DRM_SCATTER_GATHER:
657                 vma->vm_ops = &drm_vm_sg_ops;
658                 vma->vm_private_data = (void *)map;
659 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
660                 vma->vm_flags |= VM_LOCKED;
661 #else
662                 vma->vm_flags |= VM_RESERVED;
663 #endif
664                 break;
665         default:
666                 return -EINVAL; /* This should never happen. */
667         }
668 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
669         vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
670 #else
671         vma->vm_flags |= VM_RESERVED; /* Don't swap */
672 #endif
673
674         vma->vm_file  =  filp;  /* Needed for drm_vm_open() */
675         drm_vm_open(vma);
676         return 0;
677 }
678 EXPORT_SYMBOL(drm_mmap);