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