Loading...
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 <drm/drmP.h>
37#include <linux/export.h>
38#include <linux/seq_file.h>
39#if defined(__ia64__)
40#include <linux/efi.h>
41#include <linux/slab.h>
42#endif
43#include <asm/pgtable.h>
44#include "drm_internal.h"
45#include "drm_legacy.h"
46
47struct drm_vma_entry {
48 struct list_head head;
49 struct vm_area_struct *vma;
50 pid_t pid;
51};
52
53static void drm_vm_open(struct vm_area_struct *vma);
54static void drm_vm_close(struct vm_area_struct *vma);
55
56static pgprot_t drm_io_prot(struct drm_local_map *map,
57 struct vm_area_struct *vma)
58{
59 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
60
61#if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__)
62 if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
63 tmp = pgprot_noncached(tmp);
64 else
65 tmp = pgprot_writecombine(tmp);
66#elif defined(__ia64__)
67 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
68 vma->vm_start))
69 tmp = pgprot_writecombine(tmp);
70 else
71 tmp = pgprot_noncached(tmp);
72#elif defined(__sparc__) || defined(__arm__) || defined(__mips__)
73 tmp = pgprot_noncached(tmp);
74#endif
75 return tmp;
76}
77
78static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
79{
80 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
81
82#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
83 tmp |= _PAGE_NO_CACHE;
84#endif
85 return tmp;
86}
87
88/**
89 * \c fault method for AGP virtual memory.
90 *
91 * \param vma virtual memory area.
92 * \param address access address.
93 * \return pointer to the page structure.
94 *
95 * Find the right map and if it's AGP memory find the real physical page to
96 * map, get the page, increment the use count and return it.
97 */
98#if IS_ENABLED(CONFIG_AGP)
99static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
100{
101 struct drm_file *priv = vma->vm_file->private_data;
102 struct drm_device *dev = priv->minor->dev;
103 struct drm_local_map *map = NULL;
104 struct drm_map_list *r_list;
105 struct drm_hash_item *hash;
106
107 /*
108 * Find the right map
109 */
110 if (!dev->agp)
111 goto vm_fault_error;
112
113 if (!dev->agp || !dev->agp->cant_use_aperture)
114 goto vm_fault_error;
115
116 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
117 goto vm_fault_error;
118
119 r_list = drm_hash_entry(hash, struct drm_map_list, hash);
120 map = r_list->map;
121
122 if (map && map->type == _DRM_AGP) {
123 /*
124 * Using vm_pgoff as a selector forces us to use this unusual
125 * addressing scheme.
126 */
127 resource_size_t offset = (unsigned long)vmf->virtual_address -
128 vma->vm_start;
129 resource_size_t baddr = map->offset + offset;
130 struct drm_agp_mem *agpmem;
131 struct page *page;
132
133#ifdef __alpha__
134 /*
135 * Adjust to a bus-relative address
136 */
137 baddr -= dev->hose->mem_space->start;
138#endif
139
140 /*
141 * It's AGP memory - find the real physical page to map
142 */
143 list_for_each_entry(agpmem, &dev->agp->memory, head) {
144 if (agpmem->bound <= baddr &&
145 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
146 break;
147 }
148
149 if (&agpmem->head == &dev->agp->memory)
150 goto vm_fault_error;
151
152 /*
153 * Get the page, inc the use count, and return it
154 */
155 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
156 page = agpmem->memory->pages[offset];
157 get_page(page);
158 vmf->page = page;
159
160 DRM_DEBUG
161 ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
162 (unsigned long long)baddr,
163 agpmem->memory->pages[offset],
164 (unsigned long long)offset,
165 page_count(page));
166 return 0;
167 }
168vm_fault_error:
169 return VM_FAULT_SIGBUS; /* Disallow mremap */
170}
171#else
172static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
173{
174 return VM_FAULT_SIGBUS;
175}
176#endif
177
178/**
179 * \c nopage method for shared virtual memory.
180 *
181 * \param vma virtual memory area.
182 * \param address access address.
183 * \return pointer to the page structure.
184 *
185 * Get the mapping, find the real physical page to map, get the page, and
186 * return it.
187 */
188static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
189{
190 struct drm_local_map *map = vma->vm_private_data;
191 unsigned long offset;
192 unsigned long i;
193 struct page *page;
194
195 if (!map)
196 return VM_FAULT_SIGBUS; /* Nothing allocated */
197
198 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
199 i = (unsigned long)map->handle + offset;
200 page = vmalloc_to_page((void *)i);
201 if (!page)
202 return VM_FAULT_SIGBUS;
203 get_page(page);
204 vmf->page = page;
205
206 DRM_DEBUG("shm_fault 0x%lx\n", offset);
207 return 0;
208}
209
210/**
211 * \c close method for shared virtual memory.
212 *
213 * \param vma virtual memory area.
214 *
215 * Deletes map information if we are the last
216 * person to close a mapping and it's not in the global maplist.
217 */
218static void drm_vm_shm_close(struct vm_area_struct *vma)
219{
220 struct drm_file *priv = vma->vm_file->private_data;
221 struct drm_device *dev = priv->minor->dev;
222 struct drm_vma_entry *pt, *temp;
223 struct drm_local_map *map;
224 struct drm_map_list *r_list;
225 int found_maps = 0;
226
227 DRM_DEBUG("0x%08lx,0x%08lx\n",
228 vma->vm_start, vma->vm_end - vma->vm_start);
229
230 map = vma->vm_private_data;
231
232 mutex_lock(&dev->struct_mutex);
233 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
234 if (pt->vma->vm_private_data == map)
235 found_maps++;
236 if (pt->vma == vma) {
237 list_del(&pt->head);
238 kfree(pt);
239 }
240 }
241
242 /* We were the only map that was found */
243 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
244 /* Check to see if we are in the maplist, if we are not, then
245 * we delete this mappings information.
246 */
247 found_maps = 0;
248 list_for_each_entry(r_list, &dev->maplist, head) {
249 if (r_list->map == map)
250 found_maps++;
251 }
252
253 if (!found_maps) {
254 drm_dma_handle_t dmah;
255
256 switch (map->type) {
257 case _DRM_REGISTERS:
258 case _DRM_FRAME_BUFFER:
259 arch_phys_wc_del(map->mtrr);
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_legacy_pci_free(dev, &dmah);
273 break;
274 }
275 kfree(map);
276 }
277 }
278 mutex_unlock(&dev->struct_mutex);
279}
280
281/**
282 * \c fault method for DMA virtual memory.
283 *
284 * \param vma virtual memory area.
285 * \param address access address.
286 * \return pointer to the page structure.
287 *
288 * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
289 */
290static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
291{
292 struct drm_file *priv = vma->vm_file->private_data;
293 struct drm_device *dev = priv->minor->dev;
294 struct drm_device_dma *dma = dev->dma;
295 unsigned long offset;
296 unsigned long page_nr;
297 struct page *page;
298
299 if (!dma)
300 return VM_FAULT_SIGBUS; /* Error */
301 if (!dma->pagelist)
302 return VM_FAULT_SIGBUS; /* Nothing allocated */
303
304 offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
305 page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
306 page = virt_to_page((void *)dma->pagelist[page_nr]);
307
308 get_page(page);
309 vmf->page = page;
310
311 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
312 return 0;
313}
314
315/**
316 * \c fault method for scatter-gather virtual memory.
317 *
318 * \param vma virtual memory area.
319 * \param address access address.
320 * \return pointer to the page structure.
321 *
322 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
323 */
324static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
325{
326 struct drm_local_map *map = vma->vm_private_data;
327 struct drm_file *priv = vma->vm_file->private_data;
328 struct drm_device *dev = priv->minor->dev;
329 struct drm_sg_mem *entry = dev->sg;
330 unsigned long offset;
331 unsigned long map_offset;
332 unsigned long page_offset;
333 struct page *page;
334
335 if (!entry)
336 return VM_FAULT_SIGBUS; /* Error */
337 if (!entry->pagelist)
338 return VM_FAULT_SIGBUS; /* Nothing allocated */
339
340 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
341 map_offset = map->offset - (unsigned long)dev->sg->virtual;
342 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
343 page = entry->pagelist[page_offset];
344 get_page(page);
345 vmf->page = page;
346
347 return 0;
348}
349
350static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
351{
352 return drm_do_vm_fault(vma, vmf);
353}
354
355static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
356{
357 return drm_do_vm_shm_fault(vma, vmf);
358}
359
360static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
361{
362 return drm_do_vm_dma_fault(vma, vmf);
363}
364
365static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
366{
367 return drm_do_vm_sg_fault(vma, vmf);
368}
369
370/** AGP virtual memory operations */
371static const struct vm_operations_struct drm_vm_ops = {
372 .fault = drm_vm_fault,
373 .open = drm_vm_open,
374 .close = drm_vm_close,
375};
376
377/** Shared virtual memory operations */
378static const struct vm_operations_struct drm_vm_shm_ops = {
379 .fault = drm_vm_shm_fault,
380 .open = drm_vm_open,
381 .close = drm_vm_shm_close,
382};
383
384/** DMA virtual memory operations */
385static const struct vm_operations_struct drm_vm_dma_ops = {
386 .fault = drm_vm_dma_fault,
387 .open = drm_vm_open,
388 .close = drm_vm_close,
389};
390
391/** Scatter-gather virtual memory operations */
392static const struct vm_operations_struct drm_vm_sg_ops = {
393 .fault = drm_vm_sg_fault,
394 .open = drm_vm_open,
395 .close = drm_vm_close,
396};
397
398/**
399 * \c open method for shared virtual memory.
400 *
401 * \param vma virtual memory area.
402 *
403 * Create a new drm_vma_entry structure as the \p vma private data entry and
404 * add it to drm_device::vmalist.
405 */
406void drm_vm_open_locked(struct drm_device *dev,
407 struct vm_area_struct *vma)
408{
409 struct drm_vma_entry *vma_entry;
410
411 DRM_DEBUG("0x%08lx,0x%08lx\n",
412 vma->vm_start, vma->vm_end - vma->vm_start);
413
414 vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
415 if (vma_entry) {
416 vma_entry->vma = vma;
417 vma_entry->pid = current->pid;
418 list_add(&vma_entry->head, &dev->vmalist);
419 }
420}
421
422static void drm_vm_open(struct vm_area_struct *vma)
423{
424 struct drm_file *priv = vma->vm_file->private_data;
425 struct drm_device *dev = priv->minor->dev;
426
427 mutex_lock(&dev->struct_mutex);
428 drm_vm_open_locked(dev, vma);
429 mutex_unlock(&dev->struct_mutex);
430}
431
432void drm_vm_close_locked(struct drm_device *dev,
433 struct vm_area_struct *vma)
434{
435 struct drm_vma_entry *pt, *temp;
436
437 DRM_DEBUG("0x%08lx,0x%08lx\n",
438 vma->vm_start, vma->vm_end - vma->vm_start);
439
440 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
441 if (pt->vma == vma) {
442 list_del(&pt->head);
443 kfree(pt);
444 break;
445 }
446 }
447}
448
449/**
450 * \c close method for all virtual memory types.
451 *
452 * \param vma virtual memory area.
453 *
454 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
455 * free it.
456 */
457static void drm_vm_close(struct vm_area_struct *vma)
458{
459 struct drm_file *priv = vma->vm_file->private_data;
460 struct drm_device *dev = priv->minor->dev;
461
462 mutex_lock(&dev->struct_mutex);
463 drm_vm_close_locked(dev, vma);
464 mutex_unlock(&dev->struct_mutex);
465}
466
467/**
468 * mmap DMA memory.
469 *
470 * \param file_priv DRM file private.
471 * \param vma virtual memory area.
472 * \return zero on success or a negative number on failure.
473 *
474 * Sets the virtual memory area operations structure to vm_dma_ops, the file
475 * pointer, and calls vm_open().
476 */
477static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
478{
479 struct drm_file *priv = filp->private_data;
480 struct drm_device *dev;
481 struct drm_device_dma *dma;
482 unsigned long length = vma->vm_end - vma->vm_start;
483
484 dev = priv->minor->dev;
485 dma = dev->dma;
486 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
487 vma->vm_start, vma->vm_end, vma->vm_pgoff);
488
489 /* Length must match exact page count */
490 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
491 return -EINVAL;
492 }
493
494 if (!capable(CAP_SYS_ADMIN) &&
495 (dma->flags & _DRM_DMA_USE_PCI_RO)) {
496 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
497#if defined(__i386__) || defined(__x86_64__)
498 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
499#else
500 /* Ye gads this is ugly. With more thought
501 we could move this up higher and use
502 `protection_map' instead. */
503 vma->vm_page_prot =
504 __pgprot(pte_val
505 (pte_wrprotect
506 (__pte(pgprot_val(vma->vm_page_prot)))));
507#endif
508 }
509
510 vma->vm_ops = &drm_vm_dma_ops;
511
512 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
513
514 drm_vm_open_locked(dev, vma);
515 return 0;
516}
517
518static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
519{
520#ifdef __alpha__
521 return dev->hose->dense_mem_base;
522#else
523 return 0;
524#endif
525}
526
527/**
528 * mmap DMA memory.
529 *
530 * \param file_priv DRM file private.
531 * \param vma virtual memory area.
532 * \return zero on success or a negative number on failure.
533 *
534 * If the virtual memory area has no offset associated with it then it's a DMA
535 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
536 * checks that the restricted flag is not set, sets the virtual memory operations
537 * according to the mapping type and remaps the pages. Finally sets the file
538 * pointer and calls vm_open().
539 */
540static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
541{
542 struct drm_file *priv = filp->private_data;
543 struct drm_device *dev = priv->minor->dev;
544 struct drm_local_map *map = NULL;
545 resource_size_t offset = 0;
546 struct drm_hash_item *hash;
547
548 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
549 vma->vm_start, vma->vm_end, vma->vm_pgoff);
550
551 if (!priv->authenticated)
552 return -EACCES;
553
554 /* We check for "dma". On Apple's UniNorth, it's valid to have
555 * the AGP mapped at physical address 0
556 * --BenH.
557 */
558 if (!vma->vm_pgoff
559#if IS_ENABLED(CONFIG_AGP)
560 && (!dev->agp
561 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
562#endif
563 )
564 return drm_mmap_dma(filp, vma);
565
566 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
567 DRM_ERROR("Could not find map\n");
568 return -EINVAL;
569 }
570
571 map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
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)
577 return -EINVAL;
578
579 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
580 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
581#if defined(__i386__) || defined(__x86_64__)
582 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
583#else
584 /* Ye gads this is ugly. With more thought
585 we could move this up higher and use
586 `protection_map' instead. */
587 vma->vm_page_prot =
588 __pgprot(pte_val
589 (pte_wrprotect
590 (__pte(pgprot_val(vma->vm_page_prot)))));
591#endif
592 }
593
594 switch (map->type) {
595#if !defined(__arm__)
596 case _DRM_AGP:
597 if (dev->agp && dev->agp->cant_use_aperture) {
598 /*
599 * On some platforms we can't talk to bus dma address from the CPU, so for
600 * memory of type DRM_AGP, we'll deal with sorting out the real physical
601 * pages and mappings in fault()
602 */
603#if defined(__powerpc__)
604 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
605#endif
606 vma->vm_ops = &drm_vm_ops;
607 break;
608 }
609 /* fall through to _DRM_FRAME_BUFFER... */
610#endif
611 case _DRM_FRAME_BUFFER:
612 case _DRM_REGISTERS:
613 offset = drm_core_get_reg_ofs(dev);
614 vma->vm_page_prot = drm_io_prot(map, vma);
615 if (io_remap_pfn_range(vma, vma->vm_start,
616 (map->offset + offset) >> PAGE_SHIFT,
617 vma->vm_end - vma->vm_start,
618 vma->vm_page_prot))
619 return -EAGAIN;
620 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
621 " offset = 0x%llx\n",
622 map->type,
623 vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
624
625 vma->vm_ops = &drm_vm_ops;
626 break;
627 case _DRM_CONSISTENT:
628 /* Consistent memory is really like shared memory. But
629 * it's allocated in a different way, so avoid fault */
630 if (remap_pfn_range(vma, vma->vm_start,
631 page_to_pfn(virt_to_page(map->handle)),
632 vma->vm_end - vma->vm_start, vma->vm_page_prot))
633 return -EAGAIN;
634 vma->vm_page_prot = drm_dma_prot(map->type, vma);
635 /* fall through to _DRM_SHM */
636 case _DRM_SHM:
637 vma->vm_ops = &drm_vm_shm_ops;
638 vma->vm_private_data = (void *)map;
639 break;
640 case _DRM_SCATTER_GATHER:
641 vma->vm_ops = &drm_vm_sg_ops;
642 vma->vm_private_data = (void *)map;
643 vma->vm_page_prot = drm_dma_prot(map->type, vma);
644 break;
645 default:
646 return -EINVAL; /* This should never happen. */
647 }
648 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
649
650 drm_vm_open_locked(dev, vma);
651 return 0;
652}
653
654int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
655{
656 struct drm_file *priv = filp->private_data;
657 struct drm_device *dev = priv->minor->dev;
658 int ret;
659
660 if (drm_device_is_unplugged(dev))
661 return -ENODEV;
662
663 mutex_lock(&dev->struct_mutex);
664 ret = drm_mmap_locked(filp, vma);
665 mutex_unlock(&dev->struct_mutex);
666
667 return ret;
668}
669EXPORT_SYMBOL(drm_legacy_mmap);
670
671void drm_legacy_vma_flush(struct drm_device *dev)
672{
673 struct drm_vma_entry *vma, *vma_temp;
674
675 /* Clear vma list (only needed for legacy drivers) */
676 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
677 list_del(&vma->head);
678 kfree(vma);
679 }
680}
681
682int drm_vma_info(struct seq_file *m, void *data)
683{
684 struct drm_info_node *node = (struct drm_info_node *) m->private;
685 struct drm_device *dev = node->minor->dev;
686 struct drm_vma_entry *pt;
687 struct vm_area_struct *vma;
688 unsigned long vma_count = 0;
689#if defined(__i386__)
690 unsigned int pgprot;
691#endif
692
693 mutex_lock(&dev->struct_mutex);
694 list_for_each_entry(pt, &dev->vmalist, head)
695 vma_count++;
696
697 seq_printf(m, "vma use count: %lu, high_memory = %pK, 0x%pK\n",
698 vma_count, high_memory,
699 (void *)(unsigned long)virt_to_phys(high_memory));
700
701 list_for_each_entry(pt, &dev->vmalist, head) {
702 vma = pt->vma;
703 if (!vma)
704 continue;
705 seq_printf(m,
706 "\n%5d 0x%pK-0x%pK %c%c%c%c%c%c 0x%08lx000",
707 pt->pid,
708 (void *)vma->vm_start, (void *)vma->vm_end,
709 vma->vm_flags & VM_READ ? 'r' : '-',
710 vma->vm_flags & VM_WRITE ? 'w' : '-',
711 vma->vm_flags & VM_EXEC ? 'x' : '-',
712 vma->vm_flags & VM_MAYSHARE ? 's' : 'p',
713 vma->vm_flags & VM_LOCKED ? 'l' : '-',
714 vma->vm_flags & VM_IO ? 'i' : '-',
715 vma->vm_pgoff);
716
717#if defined(__i386__)
718 pgprot = pgprot_val(vma->vm_page_prot);
719 seq_printf(m, " %c%c%c%c%c%c%c%c%c",
720 pgprot & _PAGE_PRESENT ? 'p' : '-',
721 pgprot & _PAGE_RW ? 'w' : 'r',
722 pgprot & _PAGE_USER ? 'u' : 's',
723 pgprot & _PAGE_PWT ? 't' : 'b',
724 pgprot & _PAGE_PCD ? 'u' : 'c',
725 pgprot & _PAGE_ACCESSED ? 'a' : '-',
726 pgprot & _PAGE_DIRTY ? 'd' : '-',
727 pgprot & _PAGE_PSE ? 'm' : 'k',
728 pgprot & _PAGE_GLOBAL ? 'g' : 'l');
729#endif
730 seq_printf(m, "\n");
731 }
732 mutex_unlock(&dev->struct_mutex);
733 return 0;
734}
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);