1 /* $NetBSD: drm_vm.c,v 1.3 2021/12/18 23:44:57 riastradh Exp $ */
2
3 /*
4 * \file drm_vm.c
5 * Memory mapping for DRM
6 *
7 * \author Rickard E. (Rik) Faith <faith@valinux.com>
8 * \author Gareth Hughes <gareth@valinux.com>
9 */
10
11 /*
12 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
13 *
14 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
15 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
16 * All Rights Reserved.
17 *
18 * Permission is hereby granted, free of charge, to any person obtaining a
19 * copy of this software and associated documentation files (the "Software"),
20 * to deal in the Software without restriction, including without limitation
21 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
22 * and/or sell copies of the Software, and to permit persons to whom the
23 * Software is furnished to do so, subject to the following conditions:
24 *
25 * The above copyright notice and this permission notice (including the next
26 * paragraph) shall be included in all copies or substantial portions of the
27 * Software.
28 *
29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
30 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
31 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
32 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
33 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
34 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
35 * OTHER DEALINGS IN THE SOFTWARE.
36 */
37
38 #include <sys/cdefs.h>
39 __KERNEL_RCSID(0, "$NetBSD: drm_vm.c,v 1.3 2021/12/18 23:44:57 riastradh Exp $");
40
41 #include <linux/export.h>
42 #include <linux/pci.h>
43 #include <linux/seq_file.h>
44 #include <linux/vmalloc.h>
45
46 #if defined(__ia64__)
47 #include <linux/efi.h>
48 #include <linux/slab.h>
49 #endif
50 #include <linux/mem_encrypt.h>
51
52 #include <asm/pgtable.h>
53
54 #include <drm/drm_agpsupport.h>
55 #include <drm/drm_device.h>
56 #include <drm/drm_drv.h>
57 #include <drm/drm_file.h>
58 #include <drm/drm_framebuffer.h>
59 #include <drm/drm_gem.h>
60 #include <drm/drm_print.h>
61
62 #include "drm_internal.h"
63 #include "drm_legacy.h"
64
65 struct drm_vma_entry {
66 struct list_head head;
67 struct vm_area_struct *vma;
68 pid_t pid;
69 };
70
71 static void drm_vm_open(struct vm_area_struct *vma);
72 static void drm_vm_close(struct vm_area_struct *vma);
73
drm_io_prot(struct drm_local_map * map,struct vm_area_struct * vma)74 static pgprot_t drm_io_prot(struct drm_local_map *map,
75 struct vm_area_struct *vma)
76 {
77 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
78
79 /* We don't want graphics memory to be mapped encrypted */
80 tmp = pgprot_decrypted(tmp);
81
82 #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) || \
83 defined(__mips__)
84 if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
85 tmp = pgprot_noncached(tmp);
86 else
87 tmp = pgprot_writecombine(tmp);
88 #elif defined(__ia64__)
89 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
90 vma->vm_start))
91 tmp = pgprot_writecombine(tmp);
92 else
93 tmp = pgprot_noncached(tmp);
94 #elif defined(__sparc__) || defined(__arm__)
95 tmp = pgprot_noncached(tmp);
96 #endif
97 return tmp;
98 }
99
drm_dma_prot(uint32_t map_type,struct vm_area_struct * vma)100 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
101 {
102 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
103
104 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
105 tmp = pgprot_noncached_wc(tmp);
106 #endif
107 return tmp;
108 }
109
110 /**
111 * \c fault method for AGP virtual memory.
112 *
113 * \param vma virtual memory area.
114 * \param address access address.
115 * \return pointer to the page structure.
116 *
117 * Find the right map and if it's AGP memory find the real physical page to
118 * map, get the page, increment the use count and return it.
119 */
120 #if IS_ENABLED(CONFIG_AGP)
drm_vm_fault(struct vm_fault * vmf)121 static vm_fault_t drm_vm_fault(struct vm_fault *vmf)
122 {
123 struct vm_area_struct *vma = vmf->vma;
124 struct drm_file *priv = vma->vm_file->private_data;
125 struct drm_device *dev = priv->minor->dev;
126 struct drm_local_map *map = NULL;
127 struct drm_map_list *r_list;
128 struct drm_hash_item *hash;
129
130 /*
131 * Find the right map
132 */
133 if (!dev->agp)
134 goto vm_fault_error;
135
136 if (!dev->agp || !dev->agp->cant_use_aperture)
137 goto vm_fault_error;
138
139 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
140 goto vm_fault_error;
141
142 r_list = drm_hash_entry(hash, struct drm_map_list, hash);
143 map = r_list->map;
144
145 if (map && map->type == _DRM_AGP) {
146 /*
147 * Using vm_pgoff as a selector forces us to use this unusual
148 * addressing scheme.
149 */
150 resource_size_t offset = vmf->address - vma->vm_start;
151 resource_size_t baddr = map->offset + offset;
152 struct drm_agp_mem *agpmem;
153 struct page *page;
154
155 #ifdef __alpha__
156 /*
157 * Adjust to a bus-relative address
158 */
159 baddr -= dev->hose->mem_space->start;
160 #endif
161
162 /*
163 * It's AGP memory - find the real physical page to map
164 */
165 list_for_each_entry(agpmem, &dev->agp->memory, head) {
166 if (agpmem->bound <= baddr &&
167 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
168 break;
169 }
170
171 if (&agpmem->head == &dev->agp->memory)
172 goto vm_fault_error;
173
174 /*
175 * Get the page, inc the use count, and return it
176 */
177 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
178 page = agpmem->memory->pages[offset];
179 get_page(page);
180 vmf->page = page;
181
182 DRM_DEBUG
183 ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
184 (unsigned long long)baddr,
185 agpmem->memory->pages[offset],
186 (unsigned long long)offset,
187 page_count(page));
188 return 0;
189 }
190 vm_fault_error:
191 return VM_FAULT_SIGBUS; /* Disallow mremap */
192 }
193 #else
drm_vm_fault(struct vm_fault * vmf)194 static vm_fault_t drm_vm_fault(struct vm_fault *vmf)
195 {
196 return VM_FAULT_SIGBUS;
197 }
198 #endif
199
200 /**
201 * \c nopage method for shared virtual memory.
202 *
203 * \param vma virtual memory area.
204 * \param address access address.
205 * \return pointer to the page structure.
206 *
207 * Get the mapping, find the real physical page to map, get the page, and
208 * return it.
209 */
drm_vm_shm_fault(struct vm_fault * vmf)210 static vm_fault_t drm_vm_shm_fault(struct vm_fault *vmf)
211 {
212 struct vm_area_struct *vma = vmf->vma;
213 struct drm_local_map *map = vma->vm_private_data;
214 unsigned long offset;
215 unsigned long i;
216 struct page *page;
217
218 if (!map)
219 return VM_FAULT_SIGBUS; /* Nothing allocated */
220
221 offset = vmf->address - vma->vm_start;
222 i = (unsigned long)map->handle + offset;
223 page = vmalloc_to_page((void *)i);
224 if (!page)
225 return VM_FAULT_SIGBUS;
226 get_page(page);
227 vmf->page = page;
228
229 DRM_DEBUG("shm_fault 0x%lx\n", offset);
230 return 0;
231 }
232
233 /**
234 * \c close method for shared virtual memory.
235 *
236 * \param vma virtual memory area.
237 *
238 * Deletes map information if we are the last
239 * person to close a mapping and it's not in the global maplist.
240 */
drm_vm_shm_close(struct vm_area_struct * vma)241 static void drm_vm_shm_close(struct vm_area_struct *vma)
242 {
243 struct drm_file *priv = vma->vm_file->private_data;
244 struct drm_device *dev = priv->minor->dev;
245 struct drm_vma_entry *pt, *temp;
246 struct drm_local_map *map;
247 struct drm_map_list *r_list;
248 int found_maps = 0;
249
250 DRM_DEBUG("0x%08lx,0x%08lx\n",
251 vma->vm_start, vma->vm_end - vma->vm_start);
252
253 map = vma->vm_private_data;
254
255 mutex_lock(&dev->struct_mutex);
256 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
257 if (pt->vma->vm_private_data == map)
258 found_maps++;
259 if (pt->vma == vma) {
260 list_del(&pt->head);
261 kfree(pt);
262 }
263 }
264
265 /* We were the only map that was found */
266 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
267 /* Check to see if we are in the maplist, if we are not, then
268 * we delete this mappings information.
269 */
270 found_maps = 0;
271 list_for_each_entry(r_list, &dev->maplist, head) {
272 if (r_list->map == map)
273 found_maps++;
274 }
275
276 if (!found_maps) {
277 drm_dma_handle_t dmah;
278
279 switch (map->type) {
280 case _DRM_REGISTERS:
281 case _DRM_FRAME_BUFFER:
282 arch_phys_wc_del(map->mtrr);
283 iounmap(map->handle);
284 break;
285 case _DRM_SHM:
286 vfree(map->handle);
287 break;
288 case _DRM_AGP:
289 case _DRM_SCATTER_GATHER:
290 break;
291 case _DRM_CONSISTENT:
292 dmah.vaddr = map->handle;
293 dmah.busaddr = map->offset;
294 dmah.size = map->size;
295 __drm_legacy_pci_free(dev, &dmah);
296 break;
297 }
298 kfree(map);
299 }
300 }
301 mutex_unlock(&dev->struct_mutex);
302 }
303
304 /**
305 * \c fault method for DMA virtual memory.
306 *
307 * \param address access address.
308 * \return pointer to the page structure.
309 *
310 * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
311 */
drm_vm_dma_fault(struct vm_fault * vmf)312 static vm_fault_t drm_vm_dma_fault(struct vm_fault *vmf)
313 {
314 struct vm_area_struct *vma = vmf->vma;
315 struct drm_file *priv = vma->vm_file->private_data;
316 struct drm_device *dev = priv->minor->dev;
317 struct drm_device_dma *dma = dev->dma;
318 unsigned long offset;
319 unsigned long page_nr;
320 struct page *page;
321
322 if (!dma)
323 return VM_FAULT_SIGBUS; /* Error */
324 if (!dma->pagelist)
325 return VM_FAULT_SIGBUS; /* Nothing allocated */
326
327 offset = vmf->address - vma->vm_start;
328 /* vm_[pg]off[set] should be 0 */
329 page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
330 page = virt_to_page((void *)dma->pagelist[page_nr]);
331
332 get_page(page);
333 vmf->page = page;
334
335 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
336 return 0;
337 }
338
339 /**
340 * \c fault method for scatter-gather virtual memory.
341 *
342 * \param address access address.
343 * \return pointer to the page structure.
344 *
345 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
346 */
drm_vm_sg_fault(struct vm_fault * vmf)347 static vm_fault_t drm_vm_sg_fault(struct vm_fault *vmf)
348 {
349 struct vm_area_struct *vma = vmf->vma;
350 struct drm_local_map *map = vma->vm_private_data;
351 struct drm_file *priv = vma->vm_file->private_data;
352 struct drm_device *dev = priv->minor->dev;
353 struct drm_sg_mem *entry = dev->sg;
354 unsigned long offset;
355 unsigned long map_offset;
356 unsigned long page_offset;
357 struct page *page;
358
359 if (!entry)
360 return VM_FAULT_SIGBUS; /* Error */
361 if (!entry->pagelist)
362 return VM_FAULT_SIGBUS; /* Nothing allocated */
363
364 offset = vmf->address - vma->vm_start;
365 map_offset = map->offset - (unsigned long)dev->sg->virtual;
366 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
367 page = entry->pagelist[page_offset];
368 get_page(page);
369 vmf->page = page;
370
371 return 0;
372 }
373
374 /** AGP virtual memory operations */
375 static const struct vm_operations_struct drm_vm_ops = {
376 .fault = drm_vm_fault,
377 .open = drm_vm_open,
378 .close = drm_vm_close,
379 };
380
381 /** Shared virtual memory operations */
382 static const struct vm_operations_struct drm_vm_shm_ops = {
383 .fault = drm_vm_shm_fault,
384 .open = drm_vm_open,
385 .close = drm_vm_shm_close,
386 };
387
388 /** DMA virtual memory operations */
389 static const struct vm_operations_struct drm_vm_dma_ops = {
390 .fault = drm_vm_dma_fault,
391 .open = drm_vm_open,
392 .close = drm_vm_close,
393 };
394
395 /** Scatter-gather virtual memory operations */
396 static const struct vm_operations_struct drm_vm_sg_ops = {
397 .fault = drm_vm_sg_fault,
398 .open = drm_vm_open,
399 .close = drm_vm_close,
400 };
401
drm_vm_open_locked(struct drm_device * dev,struct vm_area_struct * vma)402 static void drm_vm_open_locked(struct drm_device *dev,
403 struct vm_area_struct *vma)
404 {
405 struct drm_vma_entry *vma_entry;
406
407 DRM_DEBUG("0x%08lx,0x%08lx\n",
408 vma->vm_start, vma->vm_end - vma->vm_start);
409
410 vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
411 if (vma_entry) {
412 vma_entry->vma = vma;
413 vma_entry->pid = current->pid;
414 list_add(&vma_entry->head, &dev->vmalist);
415 }
416 }
417
drm_vm_open(struct vm_area_struct * vma)418 static void drm_vm_open(struct vm_area_struct *vma)
419 {
420 struct drm_file *priv = vma->vm_file->private_data;
421 struct drm_device *dev = priv->minor->dev;
422
423 mutex_lock(&dev->struct_mutex);
424 drm_vm_open_locked(dev, vma);
425 mutex_unlock(&dev->struct_mutex);
426 }
427
drm_vm_close_locked(struct drm_device * dev,struct vm_area_struct * vma)428 static void drm_vm_close_locked(struct drm_device *dev,
429 struct vm_area_struct *vma)
430 {
431 struct drm_vma_entry *pt, *temp;
432
433 DRM_DEBUG("0x%08lx,0x%08lx\n",
434 vma->vm_start, vma->vm_end - vma->vm_start);
435
436 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
437 if (pt->vma == vma) {
438 list_del(&pt->head);
439 kfree(pt);
440 break;
441 }
442 }
443 }
444
445 /**
446 * \c close method for all virtual memory types.
447 *
448 * \param vma virtual memory area.
449 *
450 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
451 * free it.
452 */
drm_vm_close(struct vm_area_struct * vma)453 static void drm_vm_close(struct vm_area_struct *vma)
454 {
455 struct drm_file *priv = vma->vm_file->private_data;
456 struct drm_device *dev = priv->minor->dev;
457
458 mutex_lock(&dev->struct_mutex);
459 drm_vm_close_locked(dev, vma);
460 mutex_unlock(&dev->struct_mutex);
461 }
462
463 /**
464 * mmap DMA memory.
465 *
466 * \param file_priv DRM file private.
467 * \param vma virtual memory area.
468 * \return zero on success or a negative number on failure.
469 *
470 * Sets the virtual memory area operations structure to vm_dma_ops, the file
471 * pointer, and calls vm_open().
472 */
drm_mmap_dma(struct file * filp,struct vm_area_struct * vma)473 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
474 {
475 struct drm_file *priv = filp->private_data;
476 struct drm_device *dev;
477 struct drm_device_dma *dma;
478 unsigned long length = vma->vm_end - vma->vm_start;
479
480 dev = priv->minor->dev;
481 dma = dev->dma;
482 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
483 vma->vm_start, vma->vm_end, vma->vm_pgoff);
484
485 /* Length must match exact page count */
486 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
487 return -EINVAL;
488 }
489
490 if (!capable(CAP_SYS_ADMIN) &&
491 (dma->flags & _DRM_DMA_USE_PCI_RO)) {
492 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
493 #if defined(__i386__) || defined(__x86_64__)
494 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
495 #else
496 /* Ye gads this is ugly. With more thought
497 we could move this up higher and use
498 `protection_map' instead. */
499 vma->vm_page_prot =
500 __pgprot(pte_val
501 (pte_wrprotect
502 (__pte(pgprot_val(vma->vm_page_prot)))));
503 #endif
504 }
505
506 vma->vm_ops = &drm_vm_dma_ops;
507
508 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
509
510 drm_vm_open_locked(dev, vma);
511 return 0;
512 }
513
drm_core_get_reg_ofs(struct drm_device * dev)514 static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
515 {
516 #ifdef __alpha__
517 return dev->hose->dense_mem_base;
518 #else
519 return 0;
520 #endif
521 }
522
523 /**
524 * mmap DMA memory.
525 *
526 * \param file_priv DRM file private.
527 * \param vma virtual memory area.
528 * \return zero on success or a negative number on failure.
529 *
530 * If the virtual memory area has no offset associated with it then it's a DMA
531 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
532 * checks that the restricted flag is not set, sets the virtual memory operations
533 * according to the mapping type and remaps the pages. Finally sets the file
534 * pointer and calls vm_open().
535 */
drm_mmap_locked(struct file * filp,struct vm_area_struct * vma)536 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
537 {
538 struct drm_file *priv = filp->private_data;
539 struct drm_device *dev = priv->minor->dev;
540 struct drm_local_map *map = NULL;
541 resource_size_t offset = 0;
542 struct drm_hash_item *hash;
543
544 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
545 vma->vm_start, vma->vm_end, vma->vm_pgoff);
546
547 if (!priv->authenticated)
548 return -EACCES;
549
550 /* We check for "dma". On Apple's UniNorth, it's valid to have
551 * the AGP mapped at physical address 0
552 * --BenH.
553 */
554 if (!vma->vm_pgoff
555 #if IS_ENABLED(CONFIG_AGP)
556 && (!dev->agp
557 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
558 #endif
559 )
560 return drm_mmap_dma(filp, vma);
561
562 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
563 DRM_ERROR("Could not find map\n");
564 return -EINVAL;
565 }
566
567 map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
568 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
569 return -EPERM;
570
571 /* Check for valid size. */
572 if (map->size < vma->vm_end - vma->vm_start)
573 return -EINVAL;
574
575 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
576 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
577 #if defined(__i386__) || defined(__x86_64__)
578 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
579 #else
580 /* Ye gads this is ugly. With more thought
581 we could move this up higher and use
582 `protection_map' instead. */
583 vma->vm_page_prot =
584 __pgprot(pte_val
585 (pte_wrprotect
586 (__pte(pgprot_val(vma->vm_page_prot)))));
587 #endif
588 }
589
590 switch (map->type) {
591 #if !defined(__arm__)
592 case _DRM_AGP:
593 if (dev->agp && dev->agp->cant_use_aperture) {
594 /*
595 * On some platforms we can't talk to bus dma address from the CPU, so for
596 * memory of type DRM_AGP, we'll deal with sorting out the real physical
597 * pages and mappings in fault()
598 */
599 #if defined(__powerpc__)
600 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
601 #endif
602 vma->vm_ops = &drm_vm_ops;
603 break;
604 }
605 #endif
606 /* fall through - to _DRM_FRAME_BUFFER... */
607 case _DRM_FRAME_BUFFER:
608 case _DRM_REGISTERS:
609 offset = drm_core_get_reg_ofs(dev);
610 vma->vm_page_prot = drm_io_prot(map, vma);
611 if (io_remap_pfn_range(vma, vma->vm_start,
612 (map->offset + offset) >> PAGE_SHIFT,
613 vma->vm_end - vma->vm_start,
614 vma->vm_page_prot))
615 return -EAGAIN;
616 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
617 " offset = 0x%llx\n",
618 map->type,
619 vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
620
621 vma->vm_ops = &drm_vm_ops;
622 break;
623 case _DRM_CONSISTENT:
624 /* Consistent memory is really like shared memory. But
625 * it's allocated in a different way, so avoid fault */
626 if (remap_pfn_range(vma, vma->vm_start,
627 page_to_pfn(virt_to_page(map->handle)),
628 vma->vm_end - vma->vm_start, vma->vm_page_prot))
629 return -EAGAIN;
630 vma->vm_page_prot = drm_dma_prot(map->type, vma);
631 /* fall through - to _DRM_SHM */
632 case _DRM_SHM:
633 vma->vm_ops = &drm_vm_shm_ops;
634 vma->vm_private_data = (void *)map;
635 break;
636 case _DRM_SCATTER_GATHER:
637 vma->vm_ops = &drm_vm_sg_ops;
638 vma->vm_private_data = (void *)map;
639 vma->vm_page_prot = drm_dma_prot(map->type, vma);
640 break;
641 default:
642 return -EINVAL; /* This should never happen. */
643 }
644 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
645
646 drm_vm_open_locked(dev, vma);
647 return 0;
648 }
649
drm_legacy_mmap(struct file * filp,struct vm_area_struct * vma)650 int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
651 {
652 struct drm_file *priv = filp->private_data;
653 struct drm_device *dev = priv->minor->dev;
654 int ret;
655
656 if (drm_dev_is_unplugged(dev))
657 return -ENODEV;
658
659 mutex_lock(&dev->struct_mutex);
660 ret = drm_mmap_locked(filp, vma);
661 mutex_unlock(&dev->struct_mutex);
662
663 return ret;
664 }
665 EXPORT_SYMBOL(drm_legacy_mmap);
666
667 #if IS_ENABLED(CONFIG_DRM_LEGACY)
drm_legacy_vma_flush(struct drm_device * dev)668 void drm_legacy_vma_flush(struct drm_device *dev)
669 {
670 struct drm_vma_entry *vma, *vma_temp;
671
672 /* Clear vma list (only needed for legacy drivers) */
673 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
674 list_del(&vma->head);
675 kfree(vma);
676 }
677 }
678 #endif
679