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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 <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 <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 <linux/mem_encrypt.h>
44#include <asm/pgtable.h>
45#include "drm_internal.h"
46#include "drm_legacy.h"
47
48struct drm_vma_entry {
49 struct list_head head;
50 struct vm_area_struct *vma;
51 pid_t pid;
52};
53
54static void drm_vm_open(struct vm_area_struct *vma);
55static void drm_vm_close(struct vm_area_struct *vma);
56
57static pgprot_t drm_io_prot(struct drm_local_map *map,
58 struct vm_area_struct *vma)
59{
60 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
61
62 /* We don't want graphics memory to be mapped encrypted */
63 tmp = pgprot_decrypted(tmp);
64
65#if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__)
66 if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
67 tmp = pgprot_noncached(tmp);
68 else
69 tmp = pgprot_writecombine(tmp);
70#elif defined(__ia64__)
71 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
72 vma->vm_start))
73 tmp = pgprot_writecombine(tmp);
74 else
75 tmp = pgprot_noncached(tmp);
76#elif defined(__sparc__) || defined(__arm__) || defined(__mips__)
77 tmp = pgprot_noncached(tmp);
78#endif
79 return tmp;
80}
81
82static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
83{
84 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
85
86#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
87 tmp = pgprot_noncached_wc(tmp);
88#endif
89 return tmp;
90}
91
92/**
93 * \c fault method for AGP virtual memory.
94 *
95 * \param vma virtual memory area.
96 * \param address access address.
97 * \return pointer to the page structure.
98 *
99 * Find the right map and if it's AGP memory find the real physical page to
100 * map, get the page, increment the use count and return it.
101 */
102#if IS_ENABLED(CONFIG_AGP)
103static int drm_vm_fault(struct vm_fault *vmf)
104{
105 struct vm_area_struct *vma = vmf->vma;
106 struct drm_file *priv = vma->vm_file->private_data;
107 struct drm_device *dev = priv->minor->dev;
108 struct drm_local_map *map = NULL;
109 struct drm_map_list *r_list;
110 struct drm_hash_item *hash;
111
112 /*
113 * Find the right map
114 */
115 if (!dev->agp)
116 goto vm_fault_error;
117
118 if (!dev->agp || !dev->agp->cant_use_aperture)
119 goto vm_fault_error;
120
121 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
122 goto vm_fault_error;
123
124 r_list = drm_hash_entry(hash, struct drm_map_list, hash);
125 map = r_list->map;
126
127 if (map && map->type == _DRM_AGP) {
128 /*
129 * Using vm_pgoff as a selector forces us to use this unusual
130 * addressing scheme.
131 */
132 resource_size_t offset = vmf->address - vma->vm_start;
133 resource_size_t baddr = map->offset + offset;
134 struct drm_agp_mem *agpmem;
135 struct page *page;
136
137#ifdef __alpha__
138 /*
139 * Adjust to a bus-relative address
140 */
141 baddr -= dev->hose->mem_space->start;
142#endif
143
144 /*
145 * It's AGP memory - find the real physical page to map
146 */
147 list_for_each_entry(agpmem, &dev->agp->memory, head) {
148 if (agpmem->bound <= baddr &&
149 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
150 break;
151 }
152
153 if (&agpmem->head == &dev->agp->memory)
154 goto vm_fault_error;
155
156 /*
157 * Get the page, inc the use count, and return it
158 */
159 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
160 page = agpmem->memory->pages[offset];
161 get_page(page);
162 vmf->page = page;
163
164 DRM_DEBUG
165 ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
166 (unsigned long long)baddr,
167 agpmem->memory->pages[offset],
168 (unsigned long long)offset,
169 page_count(page));
170 return 0;
171 }
172vm_fault_error:
173 return VM_FAULT_SIGBUS; /* Disallow mremap */
174}
175#else
176static int drm_vm_fault(struct vm_fault *vmf)
177{
178 return VM_FAULT_SIGBUS;
179}
180#endif
181
182/**
183 * \c nopage method for shared virtual memory.
184 *
185 * \param vma virtual memory area.
186 * \param address access address.
187 * \return pointer to the page structure.
188 *
189 * Get the mapping, find the real physical page to map, get the page, and
190 * return it.
191 */
192static int drm_vm_shm_fault(struct vm_fault *vmf)
193{
194 struct vm_area_struct *vma = vmf->vma;
195 struct drm_local_map *map = vma->vm_private_data;
196 unsigned long offset;
197 unsigned long i;
198 struct page *page;
199
200 if (!map)
201 return VM_FAULT_SIGBUS; /* Nothing allocated */
202
203 offset = vmf->address - vma->vm_start;
204 i = (unsigned long)map->handle + offset;
205 page = vmalloc_to_page((void *)i);
206 if (!page)
207 return VM_FAULT_SIGBUS;
208 get_page(page);
209 vmf->page = page;
210
211 DRM_DEBUG("shm_fault 0x%lx\n", offset);
212 return 0;
213}
214
215/**
216 * \c close method for shared virtual memory.
217 *
218 * \param vma virtual memory area.
219 *
220 * Deletes map information if we are the last
221 * person to close a mapping and it's not in the global maplist.
222 */
223static void drm_vm_shm_close(struct vm_area_struct *vma)
224{
225 struct drm_file *priv = vma->vm_file->private_data;
226 struct drm_device *dev = priv->minor->dev;
227 struct drm_vma_entry *pt, *temp;
228 struct drm_local_map *map;
229 struct drm_map_list *r_list;
230 int found_maps = 0;
231
232 DRM_DEBUG("0x%08lx,0x%08lx\n",
233 vma->vm_start, vma->vm_end - vma->vm_start);
234
235 map = vma->vm_private_data;
236
237 mutex_lock(&dev->struct_mutex);
238 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
239 if (pt->vma->vm_private_data == map)
240 found_maps++;
241 if (pt->vma == vma) {
242 list_del(&pt->head);
243 kfree(pt);
244 }
245 }
246
247 /* We were the only map that was found */
248 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
249 /* Check to see if we are in the maplist, if we are not, then
250 * we delete this mappings information.
251 */
252 found_maps = 0;
253 list_for_each_entry(r_list, &dev->maplist, head) {
254 if (r_list->map == map)
255 found_maps++;
256 }
257
258 if (!found_maps) {
259 drm_dma_handle_t dmah;
260
261 switch (map->type) {
262 case _DRM_REGISTERS:
263 case _DRM_FRAME_BUFFER:
264 arch_phys_wc_del(map->mtrr);
265 iounmap(map->handle);
266 break;
267 case _DRM_SHM:
268 vfree(map->handle);
269 break;
270 case _DRM_AGP:
271 case _DRM_SCATTER_GATHER:
272 break;
273 case _DRM_CONSISTENT:
274 dmah.vaddr = map->handle;
275 dmah.busaddr = map->offset;
276 dmah.size = map->size;
277 __drm_legacy_pci_free(dev, &dmah);
278 break;
279 }
280 kfree(map);
281 }
282 }
283 mutex_unlock(&dev->struct_mutex);
284}
285
286/**
287 * \c fault method for DMA virtual memory.
288 *
289 * \param address access address.
290 * \return pointer to the page structure.
291 *
292 * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
293 */
294static int drm_vm_dma_fault(struct vm_fault *vmf)
295{
296 struct vm_area_struct *vma = vmf->vma;
297 struct drm_file *priv = vma->vm_file->private_data;
298 struct drm_device *dev = priv->minor->dev;
299 struct drm_device_dma *dma = dev->dma;
300 unsigned long offset;
301 unsigned long page_nr;
302 struct page *page;
303
304 if (!dma)
305 return VM_FAULT_SIGBUS; /* Error */
306 if (!dma->pagelist)
307 return VM_FAULT_SIGBUS; /* Nothing allocated */
308
309 offset = vmf->address - vma->vm_start;
310 /* vm_[pg]off[set] should be 0 */
311 page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
312 page = virt_to_page((void *)dma->pagelist[page_nr]);
313
314 get_page(page);
315 vmf->page = page;
316
317 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
318 return 0;
319}
320
321/**
322 * \c fault method for scatter-gather virtual memory.
323 *
324 * \param address access address.
325 * \return pointer to the page structure.
326 *
327 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
328 */
329static int drm_vm_sg_fault(struct vm_fault *vmf)
330{
331 struct vm_area_struct *vma = vmf->vma;
332 struct drm_local_map *map = vma->vm_private_data;
333 struct drm_file *priv = vma->vm_file->private_data;
334 struct drm_device *dev = priv->minor->dev;
335 struct drm_sg_mem *entry = dev->sg;
336 unsigned long offset;
337 unsigned long map_offset;
338 unsigned long page_offset;
339 struct page *page;
340
341 if (!entry)
342 return VM_FAULT_SIGBUS; /* Error */
343 if (!entry->pagelist)
344 return VM_FAULT_SIGBUS; /* Nothing allocated */
345
346 offset = vmf->address - vma->vm_start;
347 map_offset = map->offset - (unsigned long)dev->sg->virtual;
348 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
349 page = entry->pagelist[page_offset];
350 get_page(page);
351 vmf->page = page;
352
353 return 0;
354}
355
356/** AGP virtual memory operations */
357static const struct vm_operations_struct drm_vm_ops = {
358 .fault = drm_vm_fault,
359 .open = drm_vm_open,
360 .close = drm_vm_close,
361};
362
363/** Shared virtual memory operations */
364static const struct vm_operations_struct drm_vm_shm_ops = {
365 .fault = drm_vm_shm_fault,
366 .open = drm_vm_open,
367 .close = drm_vm_shm_close,
368};
369
370/** DMA virtual memory operations */
371static const struct vm_operations_struct drm_vm_dma_ops = {
372 .fault = drm_vm_dma_fault,
373 .open = drm_vm_open,
374 .close = drm_vm_close,
375};
376
377/** Scatter-gather virtual memory operations */
378static const struct vm_operations_struct drm_vm_sg_ops = {
379 .fault = drm_vm_sg_fault,
380 .open = drm_vm_open,
381 .close = drm_vm_close,
382};
383
384static void drm_vm_open_locked(struct drm_device *dev,
385 struct vm_area_struct *vma)
386{
387 struct drm_vma_entry *vma_entry;
388
389 DRM_DEBUG("0x%08lx,0x%08lx\n",
390 vma->vm_start, vma->vm_end - vma->vm_start);
391
392 vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
393 if (vma_entry) {
394 vma_entry->vma = vma;
395 vma_entry->pid = current->pid;
396 list_add(&vma_entry->head, &dev->vmalist);
397 }
398}
399
400static void drm_vm_open(struct vm_area_struct *vma)
401{
402 struct drm_file *priv = vma->vm_file->private_data;
403 struct drm_device *dev = priv->minor->dev;
404
405 mutex_lock(&dev->struct_mutex);
406 drm_vm_open_locked(dev, vma);
407 mutex_unlock(&dev->struct_mutex);
408}
409
410static void drm_vm_close_locked(struct drm_device *dev,
411 struct vm_area_struct *vma)
412{
413 struct drm_vma_entry *pt, *temp;
414
415 DRM_DEBUG("0x%08lx,0x%08lx\n",
416 vma->vm_start, vma->vm_end - vma->vm_start);
417
418 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
419 if (pt->vma == vma) {
420 list_del(&pt->head);
421 kfree(pt);
422 break;
423 }
424 }
425}
426
427/**
428 * \c close method for all virtual memory types.
429 *
430 * \param vma virtual memory area.
431 *
432 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
433 * free it.
434 */
435static void drm_vm_close(struct vm_area_struct *vma)
436{
437 struct drm_file *priv = vma->vm_file->private_data;
438 struct drm_device *dev = priv->minor->dev;
439
440 mutex_lock(&dev->struct_mutex);
441 drm_vm_close_locked(dev, vma);
442 mutex_unlock(&dev->struct_mutex);
443}
444
445/**
446 * mmap DMA memory.
447 *
448 * \param file_priv DRM file private.
449 * \param vma virtual memory area.
450 * \return zero on success or a negative number on failure.
451 *
452 * Sets the virtual memory area operations structure to vm_dma_ops, the file
453 * pointer, and calls vm_open().
454 */
455static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
456{
457 struct drm_file *priv = filp->private_data;
458 struct drm_device *dev;
459 struct drm_device_dma *dma;
460 unsigned long length = vma->vm_end - vma->vm_start;
461
462 dev = priv->minor->dev;
463 dma = dev->dma;
464 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
465 vma->vm_start, vma->vm_end, vma->vm_pgoff);
466
467 /* Length must match exact page count */
468 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
469 return -EINVAL;
470 }
471
472 if (!capable(CAP_SYS_ADMIN) &&
473 (dma->flags & _DRM_DMA_USE_PCI_RO)) {
474 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
475#if defined(__i386__) || defined(__x86_64__)
476 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
477#else
478 /* Ye gads this is ugly. With more thought
479 we could move this up higher and use
480 `protection_map' instead. */
481 vma->vm_page_prot =
482 __pgprot(pte_val
483 (pte_wrprotect
484 (__pte(pgprot_val(vma->vm_page_prot)))));
485#endif
486 }
487
488 vma->vm_ops = &drm_vm_dma_ops;
489
490 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
491
492 drm_vm_open_locked(dev, vma);
493 return 0;
494}
495
496static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
497{
498#ifdef __alpha__
499 return dev->hose->dense_mem_base;
500#else
501 return 0;
502#endif
503}
504
505/**
506 * mmap DMA memory.
507 *
508 * \param file_priv DRM file private.
509 * \param vma virtual memory area.
510 * \return zero on success or a negative number on failure.
511 *
512 * If the virtual memory area has no offset associated with it then it's a DMA
513 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
514 * checks that the restricted flag is not set, sets the virtual memory operations
515 * according to the mapping type and remaps the pages. Finally sets the file
516 * pointer and calls vm_open().
517 */
518static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
519{
520 struct drm_file *priv = filp->private_data;
521 struct drm_device *dev = priv->minor->dev;
522 struct drm_local_map *map = NULL;
523 resource_size_t offset = 0;
524 struct drm_hash_item *hash;
525
526 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
527 vma->vm_start, vma->vm_end, vma->vm_pgoff);
528
529 if (!priv->authenticated)
530 return -EACCES;
531
532 /* We check for "dma". On Apple's UniNorth, it's valid to have
533 * the AGP mapped at physical address 0
534 * --BenH.
535 */
536 if (!vma->vm_pgoff
537#if IS_ENABLED(CONFIG_AGP)
538 && (!dev->agp
539 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
540#endif
541 )
542 return drm_mmap_dma(filp, vma);
543
544 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
545 DRM_ERROR("Could not find map\n");
546 return -EINVAL;
547 }
548
549 map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
550 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
551 return -EPERM;
552
553 /* Check for valid size. */
554 if (map->size < vma->vm_end - vma->vm_start)
555 return -EINVAL;
556
557 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
558 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
559#if defined(__i386__) || defined(__x86_64__)
560 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
561#else
562 /* Ye gads this is ugly. With more thought
563 we could move this up higher and use
564 `protection_map' instead. */
565 vma->vm_page_prot =
566 __pgprot(pte_val
567 (pte_wrprotect
568 (__pte(pgprot_val(vma->vm_page_prot)))));
569#endif
570 }
571
572 switch (map->type) {
573#if !defined(__arm__)
574 case _DRM_AGP:
575 if (dev->agp && dev->agp->cant_use_aperture) {
576 /*
577 * On some platforms we can't talk to bus dma address from the CPU, so for
578 * memory of type DRM_AGP, we'll deal with sorting out the real physical
579 * pages and mappings in fault()
580 */
581#if defined(__powerpc__)
582 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
583#endif
584 vma->vm_ops = &drm_vm_ops;
585 break;
586 }
587 /* fall through to _DRM_FRAME_BUFFER... */
588#endif
589 case _DRM_FRAME_BUFFER:
590 case _DRM_REGISTERS:
591 offset = drm_core_get_reg_ofs(dev);
592 vma->vm_page_prot = drm_io_prot(map, vma);
593 if (io_remap_pfn_range(vma, vma->vm_start,
594 (map->offset + offset) >> PAGE_SHIFT,
595 vma->vm_end - vma->vm_start,
596 vma->vm_page_prot))
597 return -EAGAIN;
598 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
599 " offset = 0x%llx\n",
600 map->type,
601 vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
602
603 vma->vm_ops = &drm_vm_ops;
604 break;
605 case _DRM_CONSISTENT:
606 /* Consistent memory is really like shared memory. But
607 * it's allocated in a different way, so avoid fault */
608 if (remap_pfn_range(vma, vma->vm_start,
609 page_to_pfn(virt_to_page(map->handle)),
610 vma->vm_end - vma->vm_start, vma->vm_page_prot))
611 return -EAGAIN;
612 vma->vm_page_prot = drm_dma_prot(map->type, vma);
613 /* fall through to _DRM_SHM */
614 case _DRM_SHM:
615 vma->vm_ops = &drm_vm_shm_ops;
616 vma->vm_private_data = (void *)map;
617 break;
618 case _DRM_SCATTER_GATHER:
619 vma->vm_ops = &drm_vm_sg_ops;
620 vma->vm_private_data = (void *)map;
621 vma->vm_page_prot = drm_dma_prot(map->type, vma);
622 break;
623 default:
624 return -EINVAL; /* This should never happen. */
625 }
626 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
627
628 drm_vm_open_locked(dev, vma);
629 return 0;
630}
631
632int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
633{
634 struct drm_file *priv = filp->private_data;
635 struct drm_device *dev = priv->minor->dev;
636 int ret;
637
638 if (drm_dev_is_unplugged(dev))
639 return -ENODEV;
640
641 mutex_lock(&dev->struct_mutex);
642 ret = drm_mmap_locked(filp, vma);
643 mutex_unlock(&dev->struct_mutex);
644
645 return ret;
646}
647EXPORT_SYMBOL(drm_legacy_mmap);
648
649void drm_legacy_vma_flush(struct drm_device *dev)
650{
651 struct drm_vma_entry *vma, *vma_temp;
652
653 /* Clear vma list (only needed for legacy drivers) */
654 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
655 list_del(&vma->head);
656 kfree(vma);
657 }
658}