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