drm: misc cleanup
[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 static void drm_vm_open(struct vm_area_struct *vma);
42 static void drm_vm_close(struct vm_area_struct *vma);
43
44 /**
45  * \c nopage method for AGP virtual memory.
46  *
47  * \param vma virtual memory area.
48  * \param address access address.
49  * \return pointer to the page structure.
50  * 
51  * Find the right map and if it's AGP memory find the real physical page to
52  * map, get the page, increment the use count and return it.
53  */
54 #if __OS_HAS_AGP
55 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
56                                                  unsigned long address)
57 {
58         drm_file_t *priv  = vma->vm_file->private_data;
59         drm_device_t *dev = priv->head->dev;
60         drm_map_t *map    = NULL;
61         drm_map_list_t  *r_list;
62         struct list_head *list;
63
64         /*
65          * Find the right map
66          */
67         if (!drm_core_has_AGP(dev))
68                 goto vm_nopage_error;
69
70         if(!dev->agp || !dev->agp->cant_use_aperture) goto vm_nopage_error;
71
72         list_for_each(list, &dev->maplist->head) {
73                 r_list = list_entry(list, drm_map_list_t, head);
74                 map = r_list->map;
75                 if (!map) continue;
76                 if (map->offset == VM_OFFSET(vma)) break;
77         }
78
79         if (map && map->type == _DRM_AGP) {
80                 unsigned long offset = address - vma->vm_start;
81                 unsigned long baddr = VM_OFFSET(vma) + offset;
82                 struct drm_agp_mem *agpmem;
83                 struct page *page;
84
85 #ifdef __alpha__
86                 /*
87                  * Adjust to a bus-relative address
88                  */
89                 baddr -= dev->hose->mem_space->start;
90 #endif
91
92                 /*
93                  * It's AGP memory - find the real physical page to map
94                  */
95                 for(agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
96                         if (agpmem->bound <= baddr &&
97                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) 
98                                 break;
99                 }
100
101                 if (!agpmem) goto vm_nopage_error;
102
103                 /*
104                  * Get the page, inc the use count, and return it
105                  */
106                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
107                 page = virt_to_page(__va(agpmem->memory->memory[offset]));
108                 get_page(page);
109
110                 DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
111                           baddr, __va(agpmem->memory->memory[offset]), offset,
112                           page_count(page));
113
114                 return page;
115         }
116 vm_nopage_error:
117         return NOPAGE_SIGBUS;           /* Disallow mremap */
118 }
119 #else /* __OS_HAS_AGP */
120 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
121                                                  unsigned long address)
122 {
123         return NOPAGE_SIGBUS;
124 }
125 #endif /* __OS_HAS_AGP */
126
127 /**
128  * \c nopage method for shared virtual memory.
129  *
130  * \param vma virtual memory area.
131  * \param address access address.
132  * \return pointer to the page structure.
133  * 
134  * Get the the mapping, find the real physical page to map, get the page, and
135  * return it.
136  */
137 static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
138                                                      unsigned long address)
139 {
140         drm_map_t        *map    = (drm_map_t *)vma->vm_private_data;
141         unsigned long    offset;
142         unsigned long    i;
143         struct page      *page;
144
145         if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
146         if (!map)                  return NOPAGE_OOM;  /* Nothing allocated */
147
148         offset   = address - vma->vm_start;
149         i = (unsigned long)map->handle + offset;
150         page = vmalloc_to_page((void *)i);
151         if (!page)
152                 return NOPAGE_OOM;
153         get_page(page);
154
155         DRM_DEBUG("shm_nopage 0x%lx\n", address);
156         return page;
157 }
158
159
160 /**
161  * \c close method for shared virtual memory.
162  * 
163  * \param vma virtual memory area.
164  * 
165  * Deletes map information if we are the last
166  * person to close a mapping and it's not in the global maplist.
167  */
168 static void drm_vm_shm_close(struct vm_area_struct *vma)
169 {
170         drm_file_t      *priv   = vma->vm_file->private_data;
171         drm_device_t    *dev    = priv->head->dev;
172         drm_vma_entry_t *pt, *prev, *next;
173         drm_map_t *map;
174         drm_map_list_t *r_list;
175         struct list_head *list;
176         int found_maps = 0;
177
178         DRM_DEBUG("0x%08lx,0x%08lx\n",
179                   vma->vm_start, vma->vm_end - vma->vm_start);
180         atomic_dec(&dev->vma_count);
181
182         map = vma->vm_private_data;
183
184         down(&dev->struct_sem);
185         for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
186                 next = pt->next;
187                 if (pt->vma->vm_private_data == map) found_maps++;
188                 if (pt->vma == vma) {
189                         if (prev) {
190                                 prev->next = pt->next;
191                         } else {
192                                 dev->vmalist = pt->next;
193                         }
194                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
195                 } else {
196                         prev = pt;
197                 }
198         }
199         /* We were the only map that was found */
200         if(found_maps == 1 &&
201            map->flags & _DRM_REMOVABLE) {
202                 /* Check to see if we are in the maplist, if we are not, then
203                  * we delete this mappings information.
204                  */
205                 found_maps = 0;
206                 list = &dev->maplist->head;
207                 list_for_each(list, &dev->maplist->head) {
208                         r_list = list_entry(list, drm_map_list_t, head);
209                         if (r_list->map == map) found_maps++;
210                 }
211
212                 if(!found_maps) {
213                         switch (map->type) {
214                         case _DRM_REGISTERS:
215                         case _DRM_FRAME_BUFFER:
216                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
217                                         int retcode;
218                                         retcode = mtrr_del(map->mtrr,
219                                                            map->offset,
220                                                            map->size);
221                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
222                                 }
223                                 drm_ioremapfree(map->handle, map->size, dev);
224                                 break;
225                         case _DRM_SHM:
226                                 vfree(map->handle);
227                                 break;
228                         case _DRM_AGP:
229                         case _DRM_SCATTER_GATHER:
230                                 break;
231                         }
232                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
233                 }
234         }
235         up(&dev->struct_sem);
236 }
237
238 /**
239  * \c nopage method for DMA virtual memory.
240  *
241  * \param vma virtual memory area.
242  * \param address access address.
243  * \return pointer to the page structure.
244  * 
245  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
246  */
247 static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
248                                                      unsigned long address)
249 {
250         drm_file_t       *priv   = vma->vm_file->private_data;
251         drm_device_t     *dev    = priv->head->dev;
252         drm_device_dma_t *dma    = dev->dma;
253         unsigned long    offset;
254         unsigned long    page_nr;
255         struct page      *page;
256
257         if (!dma)                  return NOPAGE_SIGBUS; /* Error */
258         if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
259         if (!dma->pagelist)        return NOPAGE_OOM ; /* Nothing allocated */
260
261         offset   = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
262         page_nr  = offset >> PAGE_SHIFT;
263         page = virt_to_page((dma->pagelist[page_nr] + 
264                              (offset & (~PAGE_MASK))));
265
266         get_page(page);
267
268         DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
269         return page;
270 }
271
272 /**
273  * \c nopage method for scatter-gather virtual memory.
274  *
275  * \param vma virtual memory area.
276  * \param address access address.
277  * \return pointer to the page structure.
278  * 
279  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
280  */
281 static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
282                                                     unsigned long address)
283 {
284         drm_map_t        *map    = (drm_map_t *)vma->vm_private_data;
285         drm_file_t *priv = vma->vm_file->private_data;
286         drm_device_t *dev = priv->head->dev;
287         drm_sg_mem_t *entry = dev->sg;
288         unsigned long offset;
289         unsigned long map_offset;
290         unsigned long page_offset;
291         struct page *page;
292
293         if (!entry)                return NOPAGE_SIGBUS; /* Error */
294         if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
295         if (!entry->pagelist)      return NOPAGE_OOM ;  /* Nothing allocated */
296
297
298         offset = address - vma->vm_start;
299         map_offset = map->offset - dev->sg->handle;
300         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
301         page = entry->pagelist[page_offset];
302         get_page(page);
303
304         return page;
305 }
306
307
308 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
309
310 static struct page *drm_vm_nopage(struct vm_area_struct *vma,
311                                    unsigned long address,
312                                    int *type) {
313         if (type) *type = VM_FAULT_MINOR;
314         return drm_do_vm_nopage(vma, address);
315 }
316
317 static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
318                                        unsigned long address,
319                                        int *type) {
320         if (type) *type = VM_FAULT_MINOR;
321         return drm_do_vm_shm_nopage(vma, address);
322 }
323
324 static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
325                                        unsigned long address,
326                                        int *type) {
327         if (type) *type = VM_FAULT_MINOR;
328         return drm_do_vm_dma_nopage(vma, address);
329 }
330
331 static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
332                                       unsigned long address,
333                                       int *type) {
334         if (type) *type = VM_FAULT_MINOR;
335         return drm_do_vm_sg_nopage(vma, address);
336 }
337
338 #else   /* LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,0) */
339
340 static struct page *drm_vm_nopage(struct vm_area_struct *vma,
341                                    unsigned long address,
342                                    int unused) {
343         return drm_do_vm_nopage(vma, address);
344 }
345
346 static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
347                                        unsigned long address,
348                                        int unused) {
349         return drm_do_vm_shm_nopage(vma, address);
350 }
351
352 static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
353                                        unsigned long address,
354                                        int unused) {
355         return drm_do_vm_dma_nopage(vma, address);
356 }
357
358 static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
359                                       unsigned long address,
360                                       int unused) {
361         return drm_do_vm_sg_nopage(vma, address);
362 }
363
364 #endif
365
366
367 /** AGP virtual memory operations */
368 static struct vm_operations_struct   drm_vm_ops = {
369         .nopage = drm_vm_nopage,
370         .open   = drm_vm_open,
371         .close  = drm_vm_close,
372 };
373
374 /** Shared virtual memory operations */
375 static struct vm_operations_struct   drm_vm_shm_ops = {
376         .nopage = drm_vm_shm_nopage,
377         .open   = drm_vm_open,
378         .close  = drm_vm_shm_close,
379 };
380
381 /** DMA virtual memory operations */
382 static struct vm_operations_struct   drm_vm_dma_ops = {
383         .nopage = drm_vm_dma_nopage,
384         .open   = drm_vm_open,
385         .close  = drm_vm_close,
386 };
387
388 /** Scatter-gather virtual memory operations */
389 static struct vm_operations_struct   drm_vm_sg_ops = {
390         .nopage = drm_vm_sg_nopage,
391         .open   = drm_vm_open,
392         .close  = drm_vm_close,
393 };
394
395
396 /**
397  * \c open method for shared virtual memory.
398  * 
399  * \param vma virtual memory area.
400  * 
401  * Create a new drm_vma_entry structure as the \p vma private data entry and
402  * add it to drm_device::vmalist.
403  */
404 static void drm_vm_open(struct vm_area_struct *vma)
405 {
406         drm_file_t      *priv   = vma->vm_file->private_data;
407         drm_device_t    *dev    = priv->head->dev;
408         drm_vma_entry_t *vma_entry;
409
410         DRM_DEBUG("0x%08lx,0x%08lx\n",
411                   vma->vm_start, vma->vm_end - vma->vm_start);
412         atomic_inc(&dev->vma_count);
413
414         vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
415         if (vma_entry) {
416                 down(&dev->struct_sem);
417                 vma_entry->vma  = vma;
418                 vma_entry->next = dev->vmalist;
419                 vma_entry->pid  = current->pid;
420                 dev->vmalist    = vma_entry;
421                 up(&dev->struct_sem);
422         }
423 }
424
425 /**
426  * \c close method for all virtual memory types.
427  * 
428  * \param vma virtual memory area.
429  * 
430  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
431  * free it.
432  */
433 static void drm_vm_close(struct vm_area_struct *vma)
434 {
435         drm_file_t      *priv   = vma->vm_file->private_data;
436         drm_device_t    *dev    = priv->head->dev;
437         drm_vma_entry_t *pt, *prev;
438
439         DRM_DEBUG("0x%08lx,0x%08lx\n",
440                   vma->vm_start, vma->vm_end - vma->vm_start);
441         atomic_dec(&dev->vma_count);
442
443         down(&dev->struct_sem);
444         for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
445                 if (pt->vma == vma) {
446                         if (prev) {
447                                 prev->next = pt->next;
448                         } else {
449                                 dev->vmalist = pt->next;
450                         }
451                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
452                         break;
453                 }
454         }
455         up(&dev->struct_sem);
456 }
457
458 /**
459  * mmap DMA memory.
460  *
461  * \param filp file pointer.
462  * \param vma virtual memory area.
463  * \return zero on success or a negative number on failure.
464  * 
465  * Sets the virtual memory area operations structure to vm_dma_ops, the file
466  * pointer, and calls vm_open().
467  */
468 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
469 {
470         drm_file_t       *priv   = filp->private_data;
471         drm_device_t     *dev;
472         drm_device_dma_t *dma;
473         unsigned long    length  = vma->vm_end - vma->vm_start;
474
475         lock_kernel();
476         dev      = priv->head->dev;
477         dma      = dev->dma;
478         DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
479                   vma->vm_start, vma->vm_end, VM_OFFSET(vma));
480
481                                 /* Length must match exact page count */
482         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
483                 unlock_kernel();
484                 return -EINVAL;
485         }
486         unlock_kernel();
487
488         vma->vm_ops   = &drm_vm_dma_ops;
489
490 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
491         vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
492 #else
493         vma->vm_flags |= VM_RESERVED; /* Don't swap */
494 #endif
495
496         vma->vm_file  =  filp;  /* Needed for drm_vm_open() */
497         drm_vm_open(vma);
498         return 0;
499 }
500
501 unsigned long drm_core_get_map_ofs(drm_map_t *map)
502 {
503         return map->offset;
504 }
505 EXPORT_SYMBOL(drm_core_get_map_ofs);
506
507 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
508 {
509 #ifdef __alpha__
510         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
511 #else
512         return 0;
513 #endif
514 }
515 EXPORT_SYMBOL(drm_core_get_reg_ofs);
516
517 /**
518  * mmap DMA memory.
519  *
520  * \param filp file pointer.
521  * \param vma virtual memory area.
522  * \return zero on success or a negative number on failure.
523  * 
524  * If the virtual memory area has no offset associated with it then it's a DMA
525  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
526  * checks that the restricted flag is not set, sets the virtual memory operations
527  * according to the mapping type and remaps the pages. Finally sets the file
528  * pointer and calls vm_open().
529  */
530 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
531 {
532         drm_file_t      *priv   = filp->private_data;
533         drm_device_t    *dev    = priv->head->dev;
534         drm_map_t       *map    = NULL;
535         drm_map_list_t  *r_list;
536         unsigned long   offset  = 0;
537         struct list_head *list;
538
539         DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
540                   vma->vm_start, vma->vm_end, VM_OFFSET(vma));
541
542         if ( !priv->authenticated ) return -EACCES;
543
544         /* We check for "dma". On Apple's UniNorth, it's valid to have
545          * the AGP mapped at physical address 0
546          * --BenH.
547          */
548         if (!VM_OFFSET(vma)
549 #if __OS_HAS_AGP
550             && (!dev->agp || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
551 #endif
552             )
553                 return drm_mmap_dma(filp, vma);
554
555                                 /* A sequential search of a linked list is
556                                    fine here because: 1) there will only be
557                                    about 5-10 entries in the list and, 2) a
558                                    DRI client only has to do this mapping
559                                    once, so it doesn't have to be optimized
560                                    for performance, even if the list was a
561                                    bit longer. */
562         list_for_each(list, &dev->maplist->head) {
563                 unsigned long off;
564
565                 r_list = list_entry(list, drm_map_list_t, head);
566                 map = r_list->map;
567                 if (!map) continue;
568                 off = dev->driver->get_map_ofs(map);
569                 if (off == VM_OFFSET(vma)) break;
570         }
571
572         if (!map || ((map->flags&_DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
573                 return -EPERM;
574
575                                 /* Check for valid size. */
576         if (map->size != vma->vm_end - vma->vm_start) return -EINVAL;
577
578         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
579                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
580 #if defined(__i386__) || defined(__x86_64__)
581                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
582 #else
583                                 /* Ye gads this is ugly.  With more thought
584                                    we could move this up higher and use
585                                    `protection_map' instead.  */
586                 vma->vm_page_prot = __pgprot(pte_val(pte_wrprotect(
587                         __pte(pgprot_val(vma->vm_page_prot)))));
588 #endif
589         }
590
591         switch (map->type) {
592         case _DRM_AGP:
593           if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
594                 /*
595                  * On some platforms we can't talk to bus dma address from the CPU, so for
596                  * memory of type DRM_AGP, we'll deal with sorting out the real physical
597                  * pages and mappings in nopage()
598                  */
599 #if defined(__powerpc__)
600                 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
601 #endif
602                 vma->vm_ops = &drm_vm_ops;
603                 break;
604           }
605                 /* fall through to _DRM_FRAME_BUFFER... */        
606         case _DRM_FRAME_BUFFER:
607         case _DRM_REGISTERS:
608                 if (VM_OFFSET(vma) >= __pa(high_memory)) {
609 #if defined(__i386__) || defined(__x86_64__)
610                         if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {
611                                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
612                                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
613                         }
614 #elif defined(__powerpc__)
615                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE | _PAGE_GUARDED;
616 #endif
617                         vma->vm_flags |= VM_IO; /* not in core dump */
618                 }
619 #if defined(__ia64__)
620                 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
621                                     vma->vm_start))
622                         vma->vm_page_prot =
623                                 pgprot_writecombine(vma->vm_page_prot);
624                 else
625                         vma->vm_page_prot =
626                                 pgprot_noncached(vma->vm_page_prot);
627 #endif
628                 offset = dev->driver->get_reg_ofs(dev);
629 #ifdef __sparc__
630                 if (io_remap_pfn_range(DRM_RPR_ARG(vma) vma->vm_start,
631                                         (VM_OFFSET(vma) + offset) >> PAGE_SHIFT,
632                                         vma->vm_end - vma->vm_start,
633                                         vma->vm_page_prot))
634 #else
635                 if (io_remap_pfn_range(vma, vma->vm_start,
636                                      (VM_OFFSET(vma) + offset) >> PAGE_SHIFT,
637                                      vma->vm_end - vma->vm_start,
638                                      vma->vm_page_prot))
639 #endif
640                                 return -EAGAIN;
641                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
642                           " offset = 0x%lx\n",
643                           map->type,
644                           vma->vm_start, vma->vm_end, VM_OFFSET(vma) + offset);
645                 vma->vm_ops = &drm_vm_ops;
646                 break;
647         case _DRM_SHM:
648                 vma->vm_ops = &drm_vm_shm_ops;
649                 vma->vm_private_data = (void *)map;
650                                 /* Don't let this area swap.  Change when
651                                    DRM_KERNEL advisory is supported. */
652 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
653                 vma->vm_flags |= VM_LOCKED;
654 #else
655                 vma->vm_flags |= VM_RESERVED;
656 #endif
657                 break;
658         case _DRM_SCATTER_GATHER:
659                 vma->vm_ops = &drm_vm_sg_ops;
660                 vma->vm_private_data = (void *)map;
661 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
662                 vma->vm_flags |= VM_LOCKED;
663 #else
664                 vma->vm_flags |= VM_RESERVED;
665 #endif
666                 break;
667         default:
668                 return -EINVAL; /* This should never happen. */
669         }
670 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
671         vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
672 #else
673         vma->vm_flags |= VM_RESERVED; /* Don't swap */
674 #endif
675
676         vma->vm_file  =  filp;  /* Needed for drm_vm_open() */
677         drm_vm_open(vma);
678         return 0;
679 }
680 EXPORT_SYMBOL(drm_mmap);