/drivers/gpu/drm/drm_vm.c
C | 700 lines | 452 code | 82 blank | 166 comment | 64 complexity | 54d76f89e95d8d46580a9969d9ef784a MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
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 * Copyright (c) 2009, Code Aurora Forum.
15 * All Rights Reserved.
16 *
17 * Permission is hereby granted, free of charge, to any person obtaining a
18 * copy of this software and associated documentation files (the "Software"),
19 * to deal in the Software without restriction, including without limitation
20 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
21 * and/or sell copies of the Software, and to permit persons to whom the
22 * Software is furnished to do so, subject to the following conditions:
23 *
24 * The above copyright notice and this permission notice (including the next
25 * paragraph) shall be included in all copies or substantial portions of the
26 * Software.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
31 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
32 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
33 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
34 * OTHER DEALINGS IN THE SOFTWARE.
35 */
36
37#include "drmP.h"
38#if defined(__ia64__)
39#include <linux/efi.h>
40#include <linux/slab.h>
41#endif
42
43static void drm_vm_open(struct vm_area_struct *vma);
44static void drm_vm_close(struct vm_area_struct *vma);
45
46static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
47{
48 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
49
50#if defined(__i386__) || defined(__x86_64__)
51 if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) {
52 pgprot_val(tmp) |= _PAGE_PCD;
53 pgprot_val(tmp) &= ~_PAGE_PWT;
54 }
55#elif defined(__powerpc__)
56 pgprot_val(tmp) |= _PAGE_NO_CACHE;
57 if (map_type == _DRM_REGISTERS)
58 pgprot_val(tmp) |= _PAGE_GUARDED;
59#elif defined(__ia64__)
60 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
61 vma->vm_start))
62 tmp = pgprot_writecombine(tmp);
63 else
64 tmp = pgprot_noncached(tmp);
65#elif defined(__sparc__) || defined(__arm__)
66 tmp = pgprot_noncached(tmp);
67#endif
68 return tmp;
69}
70
71static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
72{
73 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
74
75#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
76 tmp |= _PAGE_NO_CACHE;
77#endif
78 return tmp;
79}
80
81/**
82 * \c fault method for AGP virtual memory.
83 *
84 * \param vma virtual memory area.
85 * \param address access address.
86 * \return pointer to the page structure.
87 *
88 * Find the right map and if it's AGP memory find the real physical page to
89 * map, get the page, increment the use count and return it.
90 */
91#if __OS_HAS_AGP
92static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
93{
94 struct drm_file *priv = vma->vm_file->private_data;
95 struct drm_device *dev = priv->minor->dev;
96 struct drm_local_map *map = NULL;
97 struct drm_map_list *r_list;
98 struct drm_hash_item *hash;
99
100 /*
101 * Find the right map
102 */
103 if (!drm_core_has_AGP(dev))
104 goto vm_fault_error;
105
106 if (!dev->agp || !dev->agp->cant_use_aperture)
107 goto vm_fault_error;
108
109 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
110 goto vm_fault_error;
111
112 r_list = drm_hash_entry(hash, struct drm_map_list, hash);
113 map = r_list->map;
114
115 if (map && map->type == _DRM_AGP) {
116 /*
117 * Using vm_pgoff as a selector forces us to use this unusual
118 * addressing scheme.
119 */
120 resource_size_t offset = (unsigned long)vmf->virtual_address -
121 vma->vm_start;
122 resource_size_t baddr = map->offset + offset;
123 struct drm_agp_mem *agpmem;
124 struct page *page;
125
126#ifdef __alpha__
127 /*
128 * Adjust to a bus-relative address
129 */
130 baddr -= dev->hose->mem_space->start;
131#endif
132
133 /*
134 * It's AGP memory - find the real physical page to map
135 */
136 list_for_each_entry(agpmem, &dev->agp->memory, head) {
137 if (agpmem->bound <= baddr &&
138 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
139 break;
140 }
141
142 if (!agpmem)
143 goto vm_fault_error;
144
145 /*
146 * Get the page, inc the use count, and return it
147 */
148 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
149 page = agpmem->memory->pages[offset];
150 get_page(page);
151 vmf->page = page;
152
153 DRM_DEBUG
154 ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
155 (unsigned long long)baddr,
156 agpmem->memory->pages[offset],
157 (unsigned long long)offset,
158 page_count(page));
159 return 0;
160 }
161vm_fault_error:
162 return VM_FAULT_SIGBUS; /* Disallow mremap */
163}
164#else /* __OS_HAS_AGP */
165static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
166{
167 return VM_FAULT_SIGBUS;
168}
169#endif /* __OS_HAS_AGP */
170
171/**
172 * \c nopage method for shared virtual memory.
173 *
174 * \param vma virtual memory area.
175 * \param address access address.
176 * \return pointer to the page structure.
177 *
178 * Get the mapping, find the real physical page to map, get the page, and
179 * return it.
180 */
181static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
182{
183 struct drm_local_map *map = vma->vm_private_data;
184 unsigned long offset;
185 unsigned long i;
186 struct page *page;
187
188 if (!map)
189 return VM_FAULT_SIGBUS; /* Nothing allocated */
190
191 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
192 i = (unsigned long)map->handle + offset;
193 page = vmalloc_to_page((void *)i);
194 if (!page)
195 return VM_FAULT_SIGBUS;
196 get_page(page);
197 vmf->page = page;
198
199 DRM_DEBUG("shm_fault 0x%lx\n", offset);
200 return 0;
201}
202
203/**
204 * \c close method for shared virtual memory.
205 *
206 * \param vma virtual memory area.
207 *
208 * Deletes map information if we are the last
209 * person to close a mapping and it's not in the global maplist.
210 */
211static void drm_vm_shm_close(struct vm_area_struct *vma)
212{
213 struct drm_file *priv = vma->vm_file->private_data;
214 struct drm_device *dev = priv->minor->dev;
215 struct drm_vma_entry *pt, *temp;
216 struct drm_local_map *map;
217 struct drm_map_list *r_list;
218 int found_maps = 0;
219
220 DRM_DEBUG("0x%08lx,0x%08lx\n",
221 vma->vm_start, vma->vm_end - vma->vm_start);
222 atomic_dec(&dev->vma_count);
223
224 map = vma->vm_private_data;
225
226 mutex_lock(&dev->struct_mutex);
227 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
228 if (pt->vma->vm_private_data == map)
229 found_maps++;
230 if (pt->vma == vma) {
231 list_del(&pt->head);
232 kfree(pt);
233 }
234 }
235
236 /* We were the only map that was found */
237 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
238 /* Check to see if we are in the maplist, if we are not, then
239 * we delete this mappings information.
240 */
241 found_maps = 0;
242 list_for_each_entry(r_list, &dev->maplist, head) {
243 if (r_list->map == map)
244 found_maps++;
245 }
246
247 if (!found_maps) {
248 drm_dma_handle_t dmah;
249
250 switch (map->type) {
251 case _DRM_REGISTERS:
252 case _DRM_FRAME_BUFFER:
253 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
254 int retcode;
255 retcode = mtrr_del(map->mtrr,
256 map->offset,
257 map->size);
258 DRM_DEBUG("mtrr_del = %d\n", retcode);
259 }
260 iounmap(map->handle);
261 break;
262 case _DRM_SHM:
263 vfree(map->handle);
264 break;
265 case _DRM_AGP:
266 case _DRM_SCATTER_GATHER:
267 break;
268 case _DRM_CONSISTENT:
269 dmah.vaddr = map->handle;
270 dmah.busaddr = map->offset;
271 dmah.size = map->size;
272 __drm_pci_free(dev, &dmah);
273 break;
274 case _DRM_GEM:
275 DRM_ERROR("tried to rmmap GEM object\n");
276 break;
277 }
278 kfree(map);
279 }
280 }
281 mutex_unlock(&dev->struct_mutex);
282}
283
284/**
285 * \c fault method for DMA virtual memory.
286 *
287 * \param vma virtual memory area.
288 * \param address access address.
289 * \return pointer to the page structure.
290 *
291 * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
292 */
293static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
294{
295 struct drm_file *priv = vma->vm_file->private_data;
296 struct drm_device *dev = priv->minor->dev;
297 struct drm_device_dma *dma = dev->dma;
298 unsigned long offset;
299 unsigned long page_nr;
300 struct page *page;
301
302 if (!dma)
303 return VM_FAULT_SIGBUS; /* Error */
304 if (!dma->pagelist)
305 return VM_FAULT_SIGBUS; /* Nothing allocated */
306
307 offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
308 page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
309 page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
310
311 get_page(page);
312 vmf->page = page;
313
314 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
315 return 0;
316}
317
318/**
319 * \c fault method for scatter-gather virtual memory.
320 *
321 * \param vma virtual memory area.
322 * \param address access address.
323 * \return pointer to the page structure.
324 *
325 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
326 */
327static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
328{
329 struct drm_local_map *map = vma->vm_private_data;
330 struct drm_file *priv = vma->vm_file->private_data;
331 struct drm_device *dev = priv->minor->dev;
332 struct drm_sg_mem *entry = dev->sg;
333 unsigned long offset;
334 unsigned long map_offset;
335 unsigned long page_offset;
336 struct page *page;
337
338 if (!entry)
339 return VM_FAULT_SIGBUS; /* Error */
340 if (!entry->pagelist)
341 return VM_FAULT_SIGBUS; /* Nothing allocated */
342
343 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
344 map_offset = map->offset - (unsigned long)dev->sg->virtual;
345 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
346 page = entry->pagelist[page_offset];
347 get_page(page);
348 vmf->page = page;
349
350 return 0;
351}
352
353static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
354{
355 return drm_do_vm_fault(vma, vmf);
356}
357
358static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
359{
360 return drm_do_vm_shm_fault(vma, vmf);
361}
362
363static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
364{
365 return drm_do_vm_dma_fault(vma, vmf);
366}
367
368static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
369{
370 return drm_do_vm_sg_fault(vma, vmf);
371}
372
373/** AGP virtual memory operations */
374static const struct vm_operations_struct drm_vm_ops = {
375 .fault = drm_vm_fault,
376 .open = drm_vm_open,
377 .close = drm_vm_close,
378};
379
380/** Shared virtual memory operations */
381static const struct vm_operations_struct drm_vm_shm_ops = {
382 .fault = drm_vm_shm_fault,
383 .open = drm_vm_open,
384 .close = drm_vm_shm_close,
385};
386
387/** DMA virtual memory operations */
388static const struct vm_operations_struct drm_vm_dma_ops = {
389 .fault = drm_vm_dma_fault,
390 .open = drm_vm_open,
391 .close = drm_vm_close,
392};
393
394/** Scatter-gather virtual memory operations */
395static const struct vm_operations_struct drm_vm_sg_ops = {
396 .fault = drm_vm_sg_fault,
397 .open = drm_vm_open,
398 .close = drm_vm_close,
399};
400
401/**
402 * \c open method for shared virtual memory.
403 *
404 * \param vma virtual memory area.
405 *
406 * Create a new drm_vma_entry structure as the \p vma private data entry and
407 * add it to drm_device::vmalist.
408 */
409void drm_vm_open_locked(struct vm_area_struct *vma)
410{
411 struct drm_file *priv = vma->vm_file->private_data;
412 struct drm_device *dev = priv->minor->dev;
413 struct drm_vma_entry *vma_entry;
414
415 DRM_DEBUG("0x%08lx,0x%08lx\n",
416 vma->vm_start, vma->vm_end - vma->vm_start);
417 atomic_inc(&dev->vma_count);
418
419 vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
420 if (vma_entry) {
421 vma_entry->vma = vma;
422 vma_entry->pid = current->pid;
423 list_add(&vma_entry->head, &dev->vmalist);
424 }
425}
426
427static void drm_vm_open(struct vm_area_struct *vma)
428{
429 struct drm_file *priv = vma->vm_file->private_data;
430 struct drm_device *dev = priv->minor->dev;
431
432 mutex_lock(&dev->struct_mutex);
433 drm_vm_open_locked(vma);
434 mutex_unlock(&dev->struct_mutex);
435}
436
437void drm_vm_close_locked(struct vm_area_struct *vma)
438{
439 struct drm_file *priv = vma->vm_file->private_data;
440 struct drm_device *dev = priv->minor->dev;
441 struct drm_vma_entry *pt, *temp;
442
443 DRM_DEBUG("0x%08lx,0x%08lx\n",
444 vma->vm_start, vma->vm_end - vma->vm_start);
445 atomic_dec(&dev->vma_count);
446
447 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
448 if (pt->vma == vma) {
449 list_del(&pt->head);
450 kfree(pt);
451 break;
452 }
453 }
454}
455
456/**
457 * \c close method for all virtual memory types.
458 *
459 * \param vma virtual memory area.
460 *
461 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
462 * free it.
463 */
464static void drm_vm_close(struct vm_area_struct *vma)
465{
466 struct drm_file *priv = vma->vm_file->private_data;
467 struct drm_device *dev = priv->minor->dev;
468
469 mutex_lock(&dev->struct_mutex);
470 drm_vm_close_locked(vma);
471 mutex_unlock(&dev->struct_mutex);
472}
473
474/**
475 * mmap DMA memory.
476 *
477 * \param file_priv DRM file private.
478 * \param vma virtual memory area.
479 * \return zero on success or a negative number on failure.
480 *
481 * Sets the virtual memory area operations structure to vm_dma_ops, the file
482 * pointer, and calls vm_open().
483 */
484static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
485{
486 struct drm_file *priv = filp->private_data;
487 struct drm_device *dev;
488 struct drm_device_dma *dma;
489 unsigned long length = vma->vm_end - vma->vm_start;
490
491 dev = priv->minor->dev;
492 dma = dev->dma;
493 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
494 vma->vm_start, vma->vm_end, vma->vm_pgoff);
495
496 /* Length must match exact page count */
497 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
498 return -EINVAL;
499 }
500
501 if (!capable(CAP_SYS_ADMIN) &&
502 (dma->flags & _DRM_DMA_USE_PCI_RO)) {
503 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
504#if defined(__i386__) || defined(__x86_64__)
505 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
506#else
507 /* Ye gads this is ugly. With more thought
508 we could move this up higher and use
509 `protection_map' instead. */
510 vma->vm_page_prot =
511 __pgprot(pte_val
512 (pte_wrprotect
513 (__pte(pgprot_val(vma->vm_page_prot)))));
514#endif
515 }
516
517 vma->vm_ops = &drm_vm_dma_ops;
518
519 vma->vm_flags |= VM_RESERVED; /* Don't swap */
520 vma->vm_flags |= VM_DONTEXPAND;
521
522 vma->vm_file = filp; /* Needed for drm_vm_open() */
523 drm_vm_open_locked(vma);
524 return 0;
525}
526
527resource_size_t drm_core_get_map_ofs(struct drm_local_map * map)
528{
529 return map->offset;
530}
531
532EXPORT_SYMBOL(drm_core_get_map_ofs);
533
534resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
535{
536#ifdef __alpha__
537 return dev->hose->dense_mem_base - dev->hose->mem_space->start;
538#else
539 return 0;
540#endif
541}
542
543EXPORT_SYMBOL(drm_core_get_reg_ofs);
544
545/**
546 * mmap DMA memory.
547 *
548 * \param file_priv DRM file private.
549 * \param vma virtual memory area.
550 * \return zero on success or a negative number on failure.
551 *
552 * If the virtual memory area has no offset associated with it then it's a DMA
553 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
554 * checks that the restricted flag is not set, sets the virtual memory operations
555 * according to the mapping type and remaps the pages. Finally sets the file
556 * pointer and calls vm_open().
557 */
558int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
559{
560 struct drm_file *priv = filp->private_data;
561 struct drm_device *dev = priv->minor->dev;
562 struct drm_local_map *map = NULL;
563 resource_size_t offset = 0;
564 struct drm_hash_item *hash;
565
566 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
567 vma->vm_start, vma->vm_end, vma->vm_pgoff);
568
569 if (!priv->authenticated)
570 return -EACCES;
571
572 /* We check for "dma". On Apple's UniNorth, it's valid to have
573 * the AGP mapped at physical address 0
574 * --BenH.
575 */
576 if (!vma->vm_pgoff
577#if __OS_HAS_AGP
578 && (!dev->agp
579 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
580#endif
581 )
582 return drm_mmap_dma(filp, vma);
583
584 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
585 DRM_ERROR("Could not find map\n");
586 return -EINVAL;
587 }
588
589 map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
590 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
591 return -EPERM;
592
593 /* Check for valid size. */
594 if (map->size < vma->vm_end - vma->vm_start)
595 return -EINVAL;
596
597 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
598 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
599#if defined(__i386__) || defined(__x86_64__)
600 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
601#else
602 /* Ye gads this is ugly. With more thought
603 we could move this up higher and use
604 `protection_map' instead. */
605 vma->vm_page_prot =
606 __pgprot(pte_val
607 (pte_wrprotect
608 (__pte(pgprot_val(vma->vm_page_prot)))));
609#endif
610 }
611
612 switch (map->type) {
613#if !defined(__arm__)
614 case _DRM_AGP:
615 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
616 /*
617 * On some platforms we can't talk to bus dma address from the CPU, so for
618 * memory of type DRM_AGP, we'll deal with sorting out the real physical
619 * pages and mappings in fault()
620 */
621#if defined(__powerpc__)
622 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
623#endif
624 vma->vm_ops = &drm_vm_ops;
625 break;
626 }
627 /* fall through to _DRM_FRAME_BUFFER... */
628#endif
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#if !defined(__arm__)
635 if (io_remap_pfn_range(vma, vma->vm_start,
636 (map->offset + offset) >> PAGE_SHIFT,
637 vma->vm_end - vma->vm_start,
638 vma->vm_page_prot))
639 return -EAGAIN;
640#else
641 if (remap_pfn_range(vma, vma->vm_start,
642 (map->offset + offset) >> PAGE_SHIFT,
643 vma->vm_end - vma->vm_start,
644 vma->vm_page_prot))
645 return -EAGAIN;
646#endif
647
648 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
649 " offset = 0x%llx\n",
650 map->type,
651 vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
652
653 vma->vm_ops = &drm_vm_ops;
654 break;
655 case _DRM_CONSISTENT:
656 /* Consistent memory is really like shared memory. But
657 * it's allocated in a different way, so avoid fault */
658 if (remap_pfn_range(vma, vma->vm_start,
659 page_to_pfn(virt_to_page(map->handle)),
660 vma->vm_end - vma->vm_start, vma->vm_page_prot))
661 return -EAGAIN;
662 vma->vm_page_prot = drm_dma_prot(map->type, vma);
663 /* fall through to _DRM_SHM */
664 case _DRM_SHM:
665 vma->vm_ops = &drm_vm_shm_ops;
666 vma->vm_private_data = (void *)map;
667 /* Don't let this area swap. Change when
668 DRM_KERNEL advisory is supported. */
669 vma->vm_flags |= VM_RESERVED;
670 break;
671 case _DRM_SCATTER_GATHER:
672 vma->vm_ops = &drm_vm_sg_ops;
673 vma->vm_private_data = (void *)map;
674 vma->vm_flags |= VM_RESERVED;
675 vma->vm_page_prot = drm_dma_prot(map->type, vma);
676 break;
677 default:
678 return -EINVAL; /* This should never happen. */
679 }
680 vma->vm_flags |= VM_RESERVED; /* Don't swap */
681 vma->vm_flags |= VM_DONTEXPAND;
682
683 vma->vm_file = filp; /* Needed for drm_vm_open() */
684 drm_vm_open_locked(vma);
685 return 0;
686}
687
688int drm_mmap(struct file *filp, struct vm_area_struct *vma)
689{
690 struct drm_file *priv = filp->private_data;
691 struct drm_device *dev = priv->minor->dev;
692 int ret;
693
694 mutex_lock(&dev->struct_mutex);
695 ret = drm_mmap_locked(filp, vma);
696 mutex_unlock(&dev->struct_mutex);
697
698 return ret;
699}
700EXPORT_SYMBOL(drm_mmap);