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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 <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
49#include <drm/drm_agpsupport.h>
50#include <drm/drm_device.h>
51#include <drm/drm_drv.h>
52#include <drm/drm_file.h>
53#include <drm/drm_framebuffer.h>
54#include <drm/drm_print.h>
55
56#include "drm_internal.h"
57#include "drm_legacy.h"
58
59struct drm_vma_entry {
60 struct list_head head;
61 struct vm_area_struct *vma;
62 pid_t pid;
63};
64
65static void drm_vm_open(struct vm_area_struct *vma);
66static void drm_vm_close(struct vm_area_struct *vma);
67
68static pgprot_t drm_io_prot(struct drm_local_map *map,
69 struct vm_area_struct *vma)
70{
71 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
72
73 /* We don't want graphics memory to be mapped encrypted */
74 tmp = pgprot_decrypted(tmp);
75
76#if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) || \
77 defined(__mips__)
78 if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
79 tmp = pgprot_noncached(tmp);
80 else
81 tmp = pgprot_writecombine(tmp);
82#elif defined(__ia64__)
83 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
84 vma->vm_start))
85 tmp = pgprot_writecombine(tmp);
86 else
87 tmp = pgprot_noncached(tmp);
88#elif defined(__sparc__) || defined(__arm__)
89 tmp = pgprot_noncached(tmp);
90#endif
91 return tmp;
92}
93
94static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
95{
96 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
97
98#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
99 tmp = pgprot_noncached_wc(tmp);
100#endif
101 return tmp;
102}
103
104/*
105 * \c fault method for AGP virtual memory.
106 *
107 * \param vma virtual memory area.
108 * \param address access address.
109 * \return pointer to the page structure.
110 *
111 * Find the right map and if it's AGP memory find the real physical page to
112 * map, get the page, increment the use count and return it.
113 */
114#if IS_ENABLED(CONFIG_AGP)
115static vm_fault_t drm_vm_fault(struct vm_fault *vmf)
116{
117 struct vm_area_struct *vma = vmf->vma;
118 struct drm_file *priv = vma->vm_file->private_data;
119 struct drm_device *dev = priv->minor->dev;
120 struct drm_local_map *map = NULL;
121 struct drm_map_list *r_list;
122 struct drm_hash_item *hash;
123
124 /*
125 * Find the right map
126 */
127 if (!dev->agp)
128 goto vm_fault_error;
129
130 if (!dev->agp || !dev->agp->cant_use_aperture)
131 goto vm_fault_error;
132
133 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
134 goto vm_fault_error;
135
136 r_list = drm_hash_entry(hash, struct drm_map_list, hash);
137 map = r_list->map;
138
139 if (map && map->type == _DRM_AGP) {
140 /*
141 * Using vm_pgoff as a selector forces us to use this unusual
142 * addressing scheme.
143 */
144 resource_size_t offset = vmf->address - vma->vm_start;
145 resource_size_t baddr = map->offset + offset;
146 struct drm_agp_mem *agpmem;
147 struct page *page;
148
149#ifdef __alpha__
150 /*
151 * Adjust to a bus-relative address
152 */
153 baddr -= dev->hose->mem_space->start;
154#endif
155
156 /*
157 * It's AGP memory - find the real physical page to map
158 */
159 list_for_each_entry(agpmem, &dev->agp->memory, head) {
160 if (agpmem->bound <= baddr &&
161 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
162 break;
163 }
164
165 if (&agpmem->head == &dev->agp->memory)
166 goto vm_fault_error;
167
168 /*
169 * Get the page, inc the use count, and return it
170 */
171 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
172 page = agpmem->memory->pages[offset];
173 get_page(page);
174 vmf->page = page;
175
176 DRM_DEBUG
177 ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
178 (unsigned long long)baddr,
179 agpmem->memory->pages[offset],
180 (unsigned long long)offset,
181 page_count(page));
182 return 0;
183 }
184vm_fault_error:
185 return VM_FAULT_SIGBUS; /* Disallow mremap */
186}
187#else
188static vm_fault_t drm_vm_fault(struct vm_fault *vmf)
189{
190 return VM_FAULT_SIGBUS;
191}
192#endif
193
194/*
195 * \c nopage method for shared virtual memory.
196 *
197 * \param vma virtual memory area.
198 * \param address access address.
199 * \return pointer to the page structure.
200 *
201 * Get the mapping, find the real physical page to map, get the page, and
202 * return it.
203 */
204static vm_fault_t drm_vm_shm_fault(struct vm_fault *vmf)
205{
206 struct vm_area_struct *vma = vmf->vma;
207 struct drm_local_map *map = vma->vm_private_data;
208 unsigned long offset;
209 unsigned long i;
210 struct page *page;
211
212 if (!map)
213 return VM_FAULT_SIGBUS; /* Nothing allocated */
214
215 offset = vmf->address - vma->vm_start;
216 i = (unsigned long)map->handle + offset;
217 page = vmalloc_to_page((void *)i);
218 if (!page)
219 return VM_FAULT_SIGBUS;
220 get_page(page);
221 vmf->page = page;
222
223 DRM_DEBUG("shm_fault 0x%lx\n", offset);
224 return 0;
225}
226
227/*
228 * \c close method for shared virtual memory.
229 *
230 * \param vma virtual memory area.
231 *
232 * Deletes map information if we are the last
233 * person to close a mapping and it's not in the global maplist.
234 */
235static void drm_vm_shm_close(struct vm_area_struct *vma)
236{
237 struct drm_file *priv = vma->vm_file->private_data;
238 struct drm_device *dev = priv->minor->dev;
239 struct drm_vma_entry *pt, *temp;
240 struct drm_local_map *map;
241 struct drm_map_list *r_list;
242 int found_maps = 0;
243
244 DRM_DEBUG("0x%08lx,0x%08lx\n",
245 vma->vm_start, vma->vm_end - vma->vm_start);
246
247 map = vma->vm_private_data;
248
249 mutex_lock(&dev->struct_mutex);
250 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
251 if (pt->vma->vm_private_data == map)
252 found_maps++;
253 if (pt->vma == vma) {
254 list_del(&pt->head);
255 kfree(pt);
256 }
257 }
258
259 /* We were the only map that was found */
260 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
261 /* Check to see if we are in the maplist, if we are not, then
262 * we delete this mappings information.
263 */
264 found_maps = 0;
265 list_for_each_entry(r_list, &dev->maplist, head) {
266 if (r_list->map == map)
267 found_maps++;
268 }
269
270 if (!found_maps) {
271 switch (map->type) {
272 case _DRM_REGISTERS:
273 case _DRM_FRAME_BUFFER:
274 arch_phys_wc_del(map->mtrr);
275 iounmap(map->handle);
276 break;
277 case _DRM_SHM:
278 vfree(map->handle);
279 break;
280 case _DRM_AGP:
281 case _DRM_SCATTER_GATHER:
282 break;
283 case _DRM_CONSISTENT:
284 dma_free_coherent(&dev->pdev->dev,
285 map->size,
286 map->handle,
287 map->offset);
288 break;
289 }
290 kfree(map);
291 }
292 }
293 mutex_unlock(&dev->struct_mutex);
294}
295
296/*
297 * \c fault method for DMA virtual memory.
298 *
299 * \param address access address.
300 * \return pointer to the page structure.
301 *
302 * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
303 */
304static vm_fault_t drm_vm_dma_fault(struct vm_fault *vmf)
305{
306 struct vm_area_struct *vma = vmf->vma;
307 struct drm_file *priv = vma->vm_file->private_data;
308 struct drm_device *dev = priv->minor->dev;
309 struct drm_device_dma *dma = dev->dma;
310 unsigned long offset;
311 unsigned long page_nr;
312 struct page *page;
313
314 if (!dma)
315 return VM_FAULT_SIGBUS; /* Error */
316 if (!dma->pagelist)
317 return VM_FAULT_SIGBUS; /* Nothing allocated */
318
319 offset = vmf->address - vma->vm_start;
320 /* vm_[pg]off[set] should be 0 */
321 page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
322 page = virt_to_page((void *)dma->pagelist[page_nr]);
323
324 get_page(page);
325 vmf->page = page;
326
327 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
328 return 0;
329}
330
331/*
332 * \c fault method for scatter-gather virtual memory.
333 *
334 * \param address access address.
335 * \return pointer to the page structure.
336 *
337 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
338 */
339static vm_fault_t drm_vm_sg_fault(struct vm_fault *vmf)
340{
341 struct vm_area_struct *vma = vmf->vma;
342 struct drm_local_map *map = vma->vm_private_data;
343 struct drm_file *priv = vma->vm_file->private_data;
344 struct drm_device *dev = priv->minor->dev;
345 struct drm_sg_mem *entry = dev->sg;
346 unsigned long offset;
347 unsigned long map_offset;
348 unsigned long page_offset;
349 struct page *page;
350
351 if (!entry)
352 return VM_FAULT_SIGBUS; /* Error */
353 if (!entry->pagelist)
354 return VM_FAULT_SIGBUS; /* Nothing allocated */
355
356 offset = vmf->address - vma->vm_start;
357 map_offset = map->offset - (unsigned long)dev->sg->virtual;
358 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
359 page = entry->pagelist[page_offset];
360 get_page(page);
361 vmf->page = page;
362
363 return 0;
364}
365
366/** AGP virtual memory operations */
367static const struct vm_operations_struct drm_vm_ops = {
368 .fault = drm_vm_fault,
369 .open = drm_vm_open,
370 .close = drm_vm_close,
371};
372
373/** Shared virtual memory operations */
374static const struct vm_operations_struct drm_vm_shm_ops = {
375 .fault = drm_vm_shm_fault,
376 .open = drm_vm_open,
377 .close = drm_vm_shm_close,
378};
379
380/** DMA virtual memory operations */
381static const struct vm_operations_struct drm_vm_dma_ops = {
382 .fault = drm_vm_dma_fault,
383 .open = drm_vm_open,
384 .close = drm_vm_close,
385};
386
387/** Scatter-gather virtual memory operations */
388static const struct vm_operations_struct drm_vm_sg_ops = {
389 .fault = drm_vm_sg_fault,
390 .open = drm_vm_open,
391 .close = drm_vm_close,
392};
393
394static void drm_vm_open_locked(struct drm_device *dev,
395 struct vm_area_struct *vma)
396{
397 struct drm_vma_entry *vma_entry;
398
399 DRM_DEBUG("0x%08lx,0x%08lx\n",
400 vma->vm_start, vma->vm_end - vma->vm_start);
401
402 vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
403 if (vma_entry) {
404 vma_entry->vma = vma;
405 vma_entry->pid = current->pid;
406 list_add(&vma_entry->head, &dev->vmalist);
407 }
408}
409
410static void drm_vm_open(struct vm_area_struct *vma)
411{
412 struct drm_file *priv = vma->vm_file->private_data;
413 struct drm_device *dev = priv->minor->dev;
414
415 mutex_lock(&dev->struct_mutex);
416 drm_vm_open_locked(dev, vma);
417 mutex_unlock(&dev->struct_mutex);
418}
419
420static void drm_vm_close_locked(struct drm_device *dev,
421 struct vm_area_struct *vma)
422{
423 struct drm_vma_entry *pt, *temp;
424
425 DRM_DEBUG("0x%08lx,0x%08lx\n",
426 vma->vm_start, vma->vm_end - vma->vm_start);
427
428 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
429 if (pt->vma == vma) {
430 list_del(&pt->head);
431 kfree(pt);
432 break;
433 }
434 }
435}
436
437/*
438 * \c close method for all virtual memory types.
439 *
440 * \param vma virtual memory area.
441 *
442 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
443 * free it.
444 */
445static void drm_vm_close(struct vm_area_struct *vma)
446{
447 struct drm_file *priv = vma->vm_file->private_data;
448 struct drm_device *dev = priv->minor->dev;
449
450 mutex_lock(&dev->struct_mutex);
451 drm_vm_close_locked(dev, vma);
452 mutex_unlock(&dev->struct_mutex);
453}
454
455/*
456 * mmap DMA memory.
457 *
458 * \param file_priv DRM file private.
459 * \param vma virtual memory area.
460 * \return zero on success or a negative number on failure.
461 *
462 * Sets the virtual memory area operations structure to vm_dma_ops, the file
463 * pointer, and calls vm_open().
464 */
465static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
466{
467 struct drm_file *priv = filp->private_data;
468 struct drm_device *dev;
469 struct drm_device_dma *dma;
470 unsigned long length = vma->vm_end - vma->vm_start;
471
472 dev = priv->minor->dev;
473 dma = dev->dma;
474 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
475 vma->vm_start, vma->vm_end, vma->vm_pgoff);
476
477 /* Length must match exact page count */
478 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
479 return -EINVAL;
480 }
481
482 if (!capable(CAP_SYS_ADMIN) &&
483 (dma->flags & _DRM_DMA_USE_PCI_RO)) {
484 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
485#if defined(__i386__) || defined(__x86_64__)
486 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
487#else
488 /* Ye gads this is ugly. With more thought
489 we could move this up higher and use
490 `protection_map' instead. */
491 vma->vm_page_prot =
492 __pgprot(pte_val
493 (pte_wrprotect
494 (__pte(pgprot_val(vma->vm_page_prot)))));
495#endif
496 }
497
498 vma->vm_ops = &drm_vm_dma_ops;
499
500 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
501
502 drm_vm_open_locked(dev, vma);
503 return 0;
504}
505
506static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
507{
508#ifdef __alpha__
509 return dev->hose->dense_mem_base;
510#else
511 return 0;
512#endif
513}
514
515/*
516 * mmap DMA memory.
517 *
518 * \param file_priv DRM file private.
519 * \param vma virtual memory area.
520 * \return zero on success or a negative number on failure.
521 *
522 * If the virtual memory area has no offset associated with it then it's a DMA
523 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
524 * checks that the restricted flag is not set, sets the virtual memory operations
525 * according to the mapping type and remaps the pages. Finally sets the file
526 * pointer and calls vm_open().
527 */
528static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
529{
530 struct drm_file *priv = filp->private_data;
531 struct drm_device *dev = priv->minor->dev;
532 struct drm_local_map *map = NULL;
533 resource_size_t offset = 0;
534 struct drm_hash_item *hash;
535
536 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
537 vma->vm_start, vma->vm_end, vma->vm_pgoff);
538
539 if (!priv->authenticated)
540 return -EACCES;
541
542 /* We check for "dma". On Apple's UniNorth, it's valid to have
543 * the AGP mapped at physical address 0
544 * --BenH.
545 */
546 if (!vma->vm_pgoff
547#if IS_ENABLED(CONFIG_AGP)
548 && (!dev->agp
549 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
550#endif
551 )
552 return drm_mmap_dma(filp, vma);
553
554 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
555 DRM_ERROR("Could not find map\n");
556 return -EINVAL;
557 }
558
559 map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
560 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
561 return -EPERM;
562
563 /* Check for valid size. */
564 if (map->size < vma->vm_end - vma->vm_start)
565 return -EINVAL;
566
567 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
568 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
569#if defined(__i386__) || defined(__x86_64__)
570 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
571#else
572 /* Ye gads this is ugly. With more thought
573 we could move this up higher and use
574 `protection_map' instead. */
575 vma->vm_page_prot =
576 __pgprot(pte_val
577 (pte_wrprotect
578 (__pte(pgprot_val(vma->vm_page_prot)))));
579#endif
580 }
581
582 switch (map->type) {
583#if !defined(__arm__)
584 case _DRM_AGP:
585 if (dev->agp && dev->agp->cant_use_aperture) {
586 /*
587 * On some platforms we can't talk to bus dma address from the CPU, so for
588 * memory of type DRM_AGP, we'll deal with sorting out the real physical
589 * pages and mappings in fault()
590 */
591#if defined(__powerpc__)
592 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
593#endif
594 vma->vm_ops = &drm_vm_ops;
595 break;
596 }
597 fallthrough; /* to _DRM_FRAME_BUFFER... */
598#endif
599 case _DRM_FRAME_BUFFER:
600 case _DRM_REGISTERS:
601 offset = drm_core_get_reg_ofs(dev);
602 vma->vm_page_prot = drm_io_prot(map, vma);
603 if (io_remap_pfn_range(vma, vma->vm_start,
604 (map->offset + offset) >> PAGE_SHIFT,
605 vma->vm_end - vma->vm_start,
606 vma->vm_page_prot))
607 return -EAGAIN;
608 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
609 " offset = 0x%llx\n",
610 map->type,
611 vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
612
613 vma->vm_ops = &drm_vm_ops;
614 break;
615 case _DRM_CONSISTENT:
616 /* Consistent memory is really like shared memory. But
617 * it's allocated in a different way, so avoid fault */
618 if (remap_pfn_range(vma, vma->vm_start,
619 page_to_pfn(virt_to_page(map->handle)),
620 vma->vm_end - vma->vm_start, vma->vm_page_prot))
621 return -EAGAIN;
622 vma->vm_page_prot = drm_dma_prot(map->type, vma);
623 fallthrough; /* to _DRM_SHM */
624 case _DRM_SHM:
625 vma->vm_ops = &drm_vm_shm_ops;
626 vma->vm_private_data = (void *)map;
627 break;
628 case _DRM_SCATTER_GATHER:
629 vma->vm_ops = &drm_vm_sg_ops;
630 vma->vm_private_data = (void *)map;
631 vma->vm_page_prot = drm_dma_prot(map->type, vma);
632 break;
633 default:
634 return -EINVAL; /* This should never happen. */
635 }
636 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
637
638 drm_vm_open_locked(dev, vma);
639 return 0;
640}
641
642int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
643{
644 struct drm_file *priv = filp->private_data;
645 struct drm_device *dev = priv->minor->dev;
646 int ret;
647
648 if (drm_dev_is_unplugged(dev))
649 return -ENODEV;
650
651 mutex_lock(&dev->struct_mutex);
652 ret = drm_mmap_locked(filp, vma);
653 mutex_unlock(&dev->struct_mutex);
654
655 return ret;
656}
657EXPORT_SYMBOL(drm_legacy_mmap);
658
659#if IS_ENABLED(CONFIG_DRM_LEGACY)
660void drm_legacy_vma_flush(struct drm_device *dev)
661{
662 struct drm_vma_entry *vma, *vma_temp;
663
664 /* Clear vma list (only needed for legacy drivers) */
665 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
666 list_del(&vma->head);
667 kfree(vma);
668 }
669}
670#endif
1/**
2 * \file drm_vm.c
3 * Memory mapping for DRM
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
11 *
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
36#include "drmP.h"
37#include <linux/export.h>
38#if defined(__ia64__)
39#include <linux/efi.h>
40#include <linux/slab.h>
41#endif
42
43static void drm_vm_open(struct vm_area_struct *vma);
44static void drm_vm_close(struct vm_area_struct *vma);
45
46static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
47{
48 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
49
50#if defined(__i386__) || defined(__x86_64__)
51 if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) {
52 pgprot_val(tmp) |= _PAGE_PCD;
53 pgprot_val(tmp) &= ~_PAGE_PWT;
54 }
55#elif defined(__powerpc__)
56 pgprot_val(tmp) |= _PAGE_NO_CACHE;
57 if (map_type == _DRM_REGISTERS)
58 pgprot_val(tmp) |= _PAGE_GUARDED;
59#elif defined(__ia64__)
60 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
61 vma->vm_start))
62 tmp = pgprot_writecombine(tmp);
63 else
64 tmp = pgprot_noncached(tmp);
65#elif defined(__sparc__) || defined(__arm__)
66 tmp = pgprot_noncached(tmp);
67#endif
68 return tmp;
69}
70
71static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
72{
73 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
74
75#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
76 tmp |= _PAGE_NO_CACHE;
77#endif
78 return tmp;
79}
80
81/**
82 * \c fault method for AGP virtual memory.
83 *
84 * \param vma virtual memory area.
85 * \param address access address.
86 * \return pointer to the page structure.
87 *
88 * Find the right map and if it's AGP memory find the real physical page to
89 * map, get the page, increment the use count and return it.
90 */
91#if __OS_HAS_AGP
92static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
93{
94 struct drm_file *priv = vma->vm_file->private_data;
95 struct drm_device *dev = priv->minor->dev;
96 struct drm_local_map *map = NULL;
97 struct drm_map_list *r_list;
98 struct drm_hash_item *hash;
99
100 /*
101 * Find the right map
102 */
103 if (!drm_core_has_AGP(dev))
104 goto vm_fault_error;
105
106 if (!dev->agp || !dev->agp->cant_use_aperture)
107 goto vm_fault_error;
108
109 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
110 goto vm_fault_error;
111
112 r_list = drm_hash_entry(hash, struct drm_map_list, hash);
113 map = r_list->map;
114
115 if (map && map->type == _DRM_AGP) {
116 /*
117 * Using vm_pgoff as a selector forces us to use this unusual
118 * addressing scheme.
119 */
120 resource_size_t offset = (unsigned long)vmf->virtual_address -
121 vma->vm_start;
122 resource_size_t baddr = map->offset + offset;
123 struct drm_agp_mem *agpmem;
124 struct page *page;
125
126#ifdef __alpha__
127 /*
128 * Adjust to a bus-relative address
129 */
130 baddr -= dev->hose->mem_space->start;
131#endif
132
133 /*
134 * It's AGP memory - find the real physical page to map
135 */
136 list_for_each_entry(agpmem, &dev->agp->memory, head) {
137 if (agpmem->bound <= baddr &&
138 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
139 break;
140 }
141
142 if (&agpmem->head == &dev->agp->memory)
143 goto vm_fault_error;
144
145 /*
146 * Get the page, inc the use count, and return it
147 */
148 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
149 page = agpmem->memory->pages[offset];
150 get_page(page);
151 vmf->page = page;
152
153 DRM_DEBUG
154 ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
155 (unsigned long long)baddr,
156 agpmem->memory->pages[offset],
157 (unsigned long long)offset,
158 page_count(page));
159 return 0;
160 }
161vm_fault_error:
162 return VM_FAULT_SIGBUS; /* Disallow mremap */
163}
164#else /* __OS_HAS_AGP */
165static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
166{
167 return VM_FAULT_SIGBUS;
168}
169#endif /* __OS_HAS_AGP */
170
171/**
172 * \c nopage method for shared virtual memory.
173 *
174 * \param vma virtual memory area.
175 * \param address access address.
176 * \return pointer to the page structure.
177 *
178 * Get the mapping, find the real physical page to map, get the page, and
179 * return it.
180 */
181static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
182{
183 struct drm_local_map *map = vma->vm_private_data;
184 unsigned long offset;
185 unsigned long i;
186 struct page *page;
187
188 if (!map)
189 return VM_FAULT_SIGBUS; /* Nothing allocated */
190
191 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
192 i = (unsigned long)map->handle + offset;
193 page = vmalloc_to_page((void *)i);
194 if (!page)
195 return VM_FAULT_SIGBUS;
196 get_page(page);
197 vmf->page = page;
198
199 DRM_DEBUG("shm_fault 0x%lx\n", offset);
200 return 0;
201}
202
203/**
204 * \c close method for shared virtual memory.
205 *
206 * \param vma virtual memory area.
207 *
208 * Deletes map information if we are the last
209 * person to close a mapping and it's not in the global maplist.
210 */
211static void drm_vm_shm_close(struct vm_area_struct *vma)
212{
213 struct drm_file *priv = vma->vm_file->private_data;
214 struct drm_device *dev = priv->minor->dev;
215 struct drm_vma_entry *pt, *temp;
216 struct drm_local_map *map;
217 struct drm_map_list *r_list;
218 int found_maps = 0;
219
220 DRM_DEBUG("0x%08lx,0x%08lx\n",
221 vma->vm_start, vma->vm_end - vma->vm_start);
222 atomic_dec(&dev->vma_count);
223
224 map = vma->vm_private_data;
225
226 mutex_lock(&dev->struct_mutex);
227 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
228 if (pt->vma->vm_private_data == map)
229 found_maps++;
230 if (pt->vma == vma) {
231 list_del(&pt->head);
232 kfree(pt);
233 }
234 }
235
236 /* We were the only map that was found */
237 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
238 /* Check to see if we are in the maplist, if we are not, then
239 * we delete this mappings information.
240 */
241 found_maps = 0;
242 list_for_each_entry(r_list, &dev->maplist, head) {
243 if (r_list->map == map)
244 found_maps++;
245 }
246
247 if (!found_maps) {
248 drm_dma_handle_t dmah;
249
250 switch (map->type) {
251 case _DRM_REGISTERS:
252 case _DRM_FRAME_BUFFER:
253 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
254 int retcode;
255 retcode = mtrr_del(map->mtrr,
256 map->offset,
257 map->size);
258 DRM_DEBUG("mtrr_del = %d\n", retcode);
259 }
260 iounmap(map->handle);
261 break;
262 case _DRM_SHM:
263 vfree(map->handle);
264 break;
265 case _DRM_AGP:
266 case _DRM_SCATTER_GATHER:
267 break;
268 case _DRM_CONSISTENT:
269 dmah.vaddr = map->handle;
270 dmah.busaddr = map->offset;
271 dmah.size = map->size;
272 __drm_pci_free(dev, &dmah);
273 break;
274 case _DRM_GEM:
275 DRM_ERROR("tried to rmmap GEM object\n");
276 break;
277 }
278 kfree(map);
279 }
280 }
281 mutex_unlock(&dev->struct_mutex);
282}
283
284/**
285 * \c fault method for DMA virtual memory.
286 *
287 * \param vma virtual memory area.
288 * \param address access address.
289 * \return pointer to the page structure.
290 *
291 * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
292 */
293static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
294{
295 struct drm_file *priv = vma->vm_file->private_data;
296 struct drm_device *dev = priv->minor->dev;
297 struct drm_device_dma *dma = dev->dma;
298 unsigned long offset;
299 unsigned long page_nr;
300 struct page *page;
301
302 if (!dma)
303 return VM_FAULT_SIGBUS; /* Error */
304 if (!dma->pagelist)
305 return VM_FAULT_SIGBUS; /* Nothing allocated */
306
307 offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
308 page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
309 page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
310
311 get_page(page);
312 vmf->page = page;
313
314 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
315 return 0;
316}
317
318/**
319 * \c fault method for scatter-gather virtual memory.
320 *
321 * \param vma virtual memory area.
322 * \param address access address.
323 * \return pointer to the page structure.
324 *
325 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
326 */
327static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
328{
329 struct drm_local_map *map = vma->vm_private_data;
330 struct drm_file *priv = vma->vm_file->private_data;
331 struct drm_device *dev = priv->minor->dev;
332 struct drm_sg_mem *entry = dev->sg;
333 unsigned long offset;
334 unsigned long map_offset;
335 unsigned long page_offset;
336 struct page *page;
337
338 if (!entry)
339 return VM_FAULT_SIGBUS; /* Error */
340 if (!entry->pagelist)
341 return VM_FAULT_SIGBUS; /* Nothing allocated */
342
343 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
344 map_offset = map->offset - (unsigned long)dev->sg->virtual;
345 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
346 page = entry->pagelist[page_offset];
347 get_page(page);
348 vmf->page = page;
349
350 return 0;
351}
352
353static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
354{
355 return drm_do_vm_fault(vma, vmf);
356}
357
358static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
359{
360 return drm_do_vm_shm_fault(vma, vmf);
361}
362
363static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
364{
365 return drm_do_vm_dma_fault(vma, vmf);
366}
367
368static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
369{
370 return drm_do_vm_sg_fault(vma, vmf);
371}
372
373/** AGP virtual memory operations */
374static const struct vm_operations_struct drm_vm_ops = {
375 .fault = drm_vm_fault,
376 .open = drm_vm_open,
377 .close = drm_vm_close,
378};
379
380/** Shared virtual memory operations */
381static const struct vm_operations_struct drm_vm_shm_ops = {
382 .fault = drm_vm_shm_fault,
383 .open = drm_vm_open,
384 .close = drm_vm_shm_close,
385};
386
387/** DMA virtual memory operations */
388static const struct vm_operations_struct drm_vm_dma_ops = {
389 .fault = drm_vm_dma_fault,
390 .open = drm_vm_open,
391 .close = drm_vm_close,
392};
393
394/** Scatter-gather virtual memory operations */
395static const struct vm_operations_struct drm_vm_sg_ops = {
396 .fault = drm_vm_sg_fault,
397 .open = drm_vm_open,
398 .close = drm_vm_close,
399};
400
401/**
402 * \c open method for shared virtual memory.
403 *
404 * \param vma virtual memory area.
405 *
406 * Create a new drm_vma_entry structure as the \p vma private data entry and
407 * add it to drm_device::vmalist.
408 */
409void drm_vm_open_locked(struct drm_device *dev,
410 struct vm_area_struct *vma)
411{
412 struct drm_vma_entry *vma_entry;
413
414 DRM_DEBUG("0x%08lx,0x%08lx\n",
415 vma->vm_start, vma->vm_end - vma->vm_start);
416 atomic_inc(&dev->vma_count);
417
418 vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
419 if (vma_entry) {
420 vma_entry->vma = vma;
421 vma_entry->pid = current->pid;
422 list_add(&vma_entry->head, &dev->vmalist);
423 }
424}
425
426static void drm_vm_open(struct vm_area_struct *vma)
427{
428 struct drm_file *priv = vma->vm_file->private_data;
429 struct drm_device *dev = priv->minor->dev;
430
431 mutex_lock(&dev->struct_mutex);
432 drm_vm_open_locked(dev, vma);
433 mutex_unlock(&dev->struct_mutex);
434}
435
436void drm_vm_close_locked(struct drm_device *dev,
437 struct vm_area_struct *vma)
438{
439 struct drm_vma_entry *pt, *temp;
440
441 DRM_DEBUG("0x%08lx,0x%08lx\n",
442 vma->vm_start, vma->vm_end - vma->vm_start);
443 atomic_dec(&dev->vma_count);
444
445 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
446 if (pt->vma == vma) {
447 list_del(&pt->head);
448 kfree(pt);
449 break;
450 }
451 }
452}
453
454/**
455 * \c close method for all virtual memory types.
456 *
457 * \param vma virtual memory area.
458 *
459 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
460 * free it.
461 */
462static void drm_vm_close(struct vm_area_struct *vma)
463{
464 struct drm_file *priv = vma->vm_file->private_data;
465 struct drm_device *dev = priv->minor->dev;
466
467 mutex_lock(&dev->struct_mutex);
468 drm_vm_close_locked(dev, vma);
469 mutex_unlock(&dev->struct_mutex);
470}
471
472/**
473 * mmap DMA memory.
474 *
475 * \param file_priv DRM file private.
476 * \param vma virtual memory area.
477 * \return zero on success or a negative number on failure.
478 *
479 * Sets the virtual memory area operations structure to vm_dma_ops, the file
480 * pointer, and calls vm_open().
481 */
482static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
483{
484 struct drm_file *priv = filp->private_data;
485 struct drm_device *dev;
486 struct drm_device_dma *dma;
487 unsigned long length = vma->vm_end - vma->vm_start;
488
489 dev = priv->minor->dev;
490 dma = dev->dma;
491 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
492 vma->vm_start, vma->vm_end, vma->vm_pgoff);
493
494 /* Length must match exact page count */
495 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
496 return -EINVAL;
497 }
498
499 if (!capable(CAP_SYS_ADMIN) &&
500 (dma->flags & _DRM_DMA_USE_PCI_RO)) {
501 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
502#if defined(__i386__) || defined(__x86_64__)
503 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
504#else
505 /* Ye gads this is ugly. With more thought
506 we could move this up higher and use
507 `protection_map' instead. */
508 vma->vm_page_prot =
509 __pgprot(pte_val
510 (pte_wrprotect
511 (__pte(pgprot_val(vma->vm_page_prot)))));
512#endif
513 }
514
515 vma->vm_ops = &drm_vm_dma_ops;
516
517 vma->vm_flags |= VM_RESERVED; /* Don't swap */
518 vma->vm_flags |= VM_DONTEXPAND;
519
520 drm_vm_open_locked(dev, vma);
521 return 0;
522}
523
524static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
525{
526#ifdef __alpha__
527 return dev->hose->dense_mem_base;
528#else
529 return 0;
530#endif
531}
532
533/**
534 * mmap DMA memory.
535 *
536 * \param file_priv DRM file private.
537 * \param vma virtual memory area.
538 * \return zero on success or a negative number on failure.
539 *
540 * If the virtual memory area has no offset associated with it then it's a DMA
541 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
542 * checks that the restricted flag is not set, sets the virtual memory operations
543 * according to the mapping type and remaps the pages. Finally sets the file
544 * pointer and calls vm_open().
545 */
546int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
547{
548 struct drm_file *priv = filp->private_data;
549 struct drm_device *dev = priv->minor->dev;
550 struct drm_local_map *map = NULL;
551 resource_size_t offset = 0;
552 struct drm_hash_item *hash;
553
554 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
555 vma->vm_start, vma->vm_end, vma->vm_pgoff);
556
557 if (!priv->authenticated)
558 return -EACCES;
559
560 /* We check for "dma". On Apple's UniNorth, it's valid to have
561 * the AGP mapped at physical address 0
562 * --BenH.
563 */
564 if (!vma->vm_pgoff
565#if __OS_HAS_AGP
566 && (!dev->agp
567 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
568#endif
569 )
570 return drm_mmap_dma(filp, vma);
571
572 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
573 DRM_ERROR("Could not find map\n");
574 return -EINVAL;
575 }
576
577 map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
578 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
579 return -EPERM;
580
581 /* Check for valid size. */
582 if (map->size < vma->vm_end - vma->vm_start)
583 return -EINVAL;
584
585 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
586 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
587#if defined(__i386__) || defined(__x86_64__)
588 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
589#else
590 /* Ye gads this is ugly. With more thought
591 we could move this up higher and use
592 `protection_map' instead. */
593 vma->vm_page_prot =
594 __pgprot(pte_val
595 (pte_wrprotect
596 (__pte(pgprot_val(vma->vm_page_prot)))));
597#endif
598 }
599
600 switch (map->type) {
601#if !defined(__arm__)
602 case _DRM_AGP:
603 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
604 /*
605 * On some platforms we can't talk to bus dma address from the CPU, so for
606 * memory of type DRM_AGP, we'll deal with sorting out the real physical
607 * pages and mappings in fault()
608 */
609#if defined(__powerpc__)
610 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
611#endif
612 vma->vm_ops = &drm_vm_ops;
613 break;
614 }
615 /* fall through to _DRM_FRAME_BUFFER... */
616#endif
617 case _DRM_FRAME_BUFFER:
618 case _DRM_REGISTERS:
619 offset = drm_core_get_reg_ofs(dev);
620 vma->vm_flags |= VM_IO; /* not in core dump */
621 vma->vm_page_prot = drm_io_prot(map->type, vma);
622#if !defined(__arm__)
623 if (io_remap_pfn_range(vma, vma->vm_start,
624 (map->offset + offset) >> PAGE_SHIFT,
625 vma->vm_end - vma->vm_start,
626 vma->vm_page_prot))
627 return -EAGAIN;
628#else
629 if (remap_pfn_range(vma, vma->vm_start,
630 (map->offset + offset) >> PAGE_SHIFT,
631 vma->vm_end - vma->vm_start,
632 vma->vm_page_prot))
633 return -EAGAIN;
634#endif
635
636 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
637 " offset = 0x%llx\n",
638 map->type,
639 vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
640
641 vma->vm_ops = &drm_vm_ops;
642 break;
643 case _DRM_CONSISTENT:
644 /* Consistent memory is really like shared memory. But
645 * it's allocated in a different way, so avoid fault */
646 if (remap_pfn_range(vma, vma->vm_start,
647 page_to_pfn(virt_to_page(map->handle)),
648 vma->vm_end - vma->vm_start, vma->vm_page_prot))
649 return -EAGAIN;
650 vma->vm_page_prot = drm_dma_prot(map->type, vma);
651 /* fall through to _DRM_SHM */
652 case _DRM_SHM:
653 vma->vm_ops = &drm_vm_shm_ops;
654 vma->vm_private_data = (void *)map;
655 /* Don't let this area swap. Change when
656 DRM_KERNEL advisory is supported. */
657 vma->vm_flags |= VM_RESERVED;
658 break;
659 case _DRM_SCATTER_GATHER:
660 vma->vm_ops = &drm_vm_sg_ops;
661 vma->vm_private_data = (void *)map;
662 vma->vm_flags |= VM_RESERVED;
663 vma->vm_page_prot = drm_dma_prot(map->type, vma);
664 break;
665 default:
666 return -EINVAL; /* This should never happen. */
667 }
668 vma->vm_flags |= VM_RESERVED; /* Don't swap */
669 vma->vm_flags |= VM_DONTEXPAND;
670
671 drm_vm_open_locked(dev, vma);
672 return 0;
673}
674
675int drm_mmap(struct file *filp, struct vm_area_struct *vma)
676{
677 struct drm_file *priv = filp->private_data;
678 struct drm_device *dev = priv->minor->dev;
679 int ret;
680
681 if (drm_device_is_unplugged(dev))
682 return -ENODEV;
683
684 mutex_lock(&dev->struct_mutex);
685 ret = drm_mmap_locked(filp, vma);
686 mutex_unlock(&dev->struct_mutex);
687
688 return ret;
689}
690EXPORT_SYMBOL(drm_mmap);