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36#include <drm/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(struct drm_local_map *map,
47 struct vm_area_struct *vma)
48{
49 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
50
51#if defined(__i386__) || defined(__x86_64__)
52 if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
53 tmp = pgprot_noncached(tmp);
54 else
55 tmp = pgprot_writecombine(tmp);
56#elif defined(__powerpc__)
57 pgprot_val(tmp) |= _PAGE_NO_CACHE;
58 if (map->type == _DRM_REGISTERS)
59 pgprot_val(tmp) |= _PAGE_GUARDED;
60#elif defined(__ia64__)
61 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
62 vma->vm_start))
63 tmp = pgprot_writecombine(tmp);
64 else
65 tmp = pgprot_noncached(tmp);
66#elif defined(__sparc__) || defined(__arm__) || defined(__mips__)
67 tmp = pgprot_noncached(tmp);
68#endif
69 return tmp;
70}
71
72static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
73{
74 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
75
76#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
77 tmp |= _PAGE_NO_CACHE;
78#endif
79 return tmp;
80}
81
82
83
84
85
86
87
88
89
90
91
92#if __OS_HAS_AGP
93static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
94{
95 struct drm_file *priv = vma->vm_file->private_data;
96 struct drm_device *dev = priv->minor->dev;
97 struct drm_local_map *map = NULL;
98 struct drm_map_list *r_list;
99 struct drm_hash_item *hash;
100
101
102
103
104 if (!drm_core_has_AGP(dev))
105 goto vm_fault_error;
106
107 if (!dev->agp || !dev->agp->cant_use_aperture)
108 goto vm_fault_error;
109
110 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
111 goto vm_fault_error;
112
113 r_list = drm_hash_entry(hash, struct drm_map_list, hash);
114 map = r_list->map;
115
116 if (map && map->type == _DRM_AGP) {
117
118
119
120
121 resource_size_t offset = (unsigned long)vmf->virtual_address -
122 vma->vm_start;
123 resource_size_t baddr = map->offset + offset;
124 struct drm_agp_mem *agpmem;
125 struct page *page;
126
127#ifdef __alpha__
128
129
130
131 baddr -= dev->hose->mem_space->start;
132#endif
133
134
135
136
137 list_for_each_entry(agpmem, &dev->agp->memory, head) {
138 if (agpmem->bound <= baddr &&
139 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
140 break;
141 }
142
143 if (&agpmem->head == &dev->agp->memory)
144 goto vm_fault_error;
145
146
147
148
149 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
150 page = agpmem->memory->pages[offset];
151 get_page(page);
152 vmf->page = page;
153
154 DRM_DEBUG
155 ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
156 (unsigned long long)baddr,
157 agpmem->memory->pages[offset],
158 (unsigned long long)offset,
159 page_count(page));
160 return 0;
161 }
162vm_fault_error:
163 return VM_FAULT_SIGBUS;
164}
165#else
166static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
167{
168 return VM_FAULT_SIGBUS;
169}
170#endif
171
172
173
174
175
176
177
178
179
180
181
182static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
183{
184 struct drm_local_map *map = vma->vm_private_data;
185 unsigned long offset;
186 unsigned long i;
187 struct page *page;
188
189 if (!map)
190 return VM_FAULT_SIGBUS;
191
192 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
193 i = (unsigned long)map->handle + offset;
194 page = vmalloc_to_page((void *)i);
195 if (!page)
196 return VM_FAULT_SIGBUS;
197 get_page(page);
198 vmf->page = page;
199
200 DRM_DEBUG("shm_fault 0x%lx\n", offset);
201 return 0;
202}
203
204
205
206
207
208
209
210
211
212static void drm_vm_shm_close(struct vm_area_struct *vma)
213{
214 struct drm_file *priv = vma->vm_file->private_data;
215 struct drm_device *dev = priv->minor->dev;
216 struct drm_vma_entry *pt, *temp;
217 struct drm_local_map *map;
218 struct drm_map_list *r_list;
219 int found_maps = 0;
220
221 DRM_DEBUG("0x%08lx,0x%08lx\n",
222 vma->vm_start, vma->vm_end - vma->vm_start);
223 atomic_dec(&dev->vma_count);
224
225 map = vma->vm_private_data;
226
227 mutex_lock(&dev->struct_mutex);
228 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
229 if (pt->vma->vm_private_data == map)
230 found_maps++;
231 if (pt->vma == vma) {
232 list_del(&pt->head);
233 kfree(pt);
234 }
235 }
236
237
238 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
239
240
241
242 found_maps = 0;
243 list_for_each_entry(r_list, &dev->maplist, head) {
244 if (r_list->map == map)
245 found_maps++;
246 }
247
248 if (!found_maps) {
249 drm_dma_handle_t dmah;
250
251 switch (map->type) {
252 case _DRM_REGISTERS:
253 case _DRM_FRAME_BUFFER:
254 if (drm_core_has_MTRR(dev))
255 arch_phys_wc_del(map->mtrr);
256 iounmap(map->handle);
257 break;
258 case _DRM_SHM:
259 vfree(map->handle);
260 break;
261 case _DRM_AGP:
262 case _DRM_SCATTER_GATHER:
263 break;
264 case _DRM_CONSISTENT:
265 dmah.vaddr = map->handle;
266 dmah.busaddr = map->offset;
267 dmah.size = map->size;
268 __drm_pci_free(dev, &dmah);
269 break;
270 case _DRM_GEM:
271 DRM_ERROR("tried to rmmap GEM object\n");
272 break;
273 }
274 kfree(map);
275 }
276 }
277 mutex_unlock(&dev->struct_mutex);
278}
279
280
281
282
283
284
285
286
287
288
289static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
290{
291 struct drm_file *priv = vma->vm_file->private_data;
292 struct drm_device *dev = priv->minor->dev;
293 struct drm_device_dma *dma = dev->dma;
294 unsigned long offset;
295 unsigned long page_nr;
296 struct page *page;
297
298 if (!dma)
299 return VM_FAULT_SIGBUS;
300 if (!dma->pagelist)
301 return VM_FAULT_SIGBUS;
302
303 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
304 page_nr = offset >> PAGE_SHIFT;
305 page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
306
307 get_page(page);
308 vmf->page = page;
309
310 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
311 return 0;
312}
313
314
315
316
317
318
319
320
321
322
323static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
324{
325 struct drm_local_map *map = vma->vm_private_data;
326 struct drm_file *priv = vma->vm_file->private_data;
327 struct drm_device *dev = priv->minor->dev;
328 struct drm_sg_mem *entry = dev->sg;
329 unsigned long offset;
330 unsigned long map_offset;
331 unsigned long page_offset;
332 struct page *page;
333
334 if (!entry)
335 return VM_FAULT_SIGBUS;
336 if (!entry->pagelist)
337 return VM_FAULT_SIGBUS;
338
339 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
340 map_offset = map->offset - (unsigned long)dev->sg->virtual;
341 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
342 page = entry->pagelist[page_offset];
343 get_page(page);
344 vmf->page = page;
345
346 return 0;
347}
348
349static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
350{
351 return drm_do_vm_fault(vma, vmf);
352}
353
354static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
355{
356 return drm_do_vm_shm_fault(vma, vmf);
357}
358
359static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
360{
361 return drm_do_vm_dma_fault(vma, vmf);
362}
363
364static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
365{
366 return drm_do_vm_sg_fault(vma, vmf);
367}
368
369
370static const struct vm_operations_struct drm_vm_ops = {
371 .fault = drm_vm_fault,
372 .open = drm_vm_open,
373 .close = drm_vm_close,
374};
375
376
377static const struct vm_operations_struct drm_vm_shm_ops = {
378 .fault = drm_vm_shm_fault,
379 .open = drm_vm_open,
380 .close = drm_vm_shm_close,
381};
382
383
384static const struct vm_operations_struct drm_vm_dma_ops = {
385 .fault = drm_vm_dma_fault,
386 .open = drm_vm_open,
387 .close = drm_vm_close,
388};
389
390
391static const struct vm_operations_struct drm_vm_sg_ops = {
392 .fault = drm_vm_sg_fault,
393 .open = drm_vm_open,
394 .close = drm_vm_close,
395};
396
397
398
399
400
401
402
403
404
405void drm_vm_open_locked(struct drm_device *dev,
406 struct vm_area_struct *vma)
407{
408 struct drm_vma_entry *vma_entry;
409
410 DRM_DEBUG("0x%08lx,0x%08lx\n",
411 vma->vm_start, vma->vm_end - vma->vm_start);
412 atomic_inc(&dev->vma_count);
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}
421EXPORT_SYMBOL_GPL(drm_vm_open_locked);
422
423static void drm_vm_open(struct vm_area_struct *vma)
424{
425 struct drm_file *priv = vma->vm_file->private_data;
426 struct drm_device *dev = priv->minor->dev;
427
428 mutex_lock(&dev->struct_mutex);
429 drm_vm_open_locked(dev, vma);
430 mutex_unlock(&dev->struct_mutex);
431}
432
433void drm_vm_close_locked(struct drm_device *dev,
434 struct vm_area_struct *vma)
435{
436 struct drm_vma_entry *pt, *temp;
437
438 DRM_DEBUG("0x%08lx,0x%08lx\n",
439 vma->vm_start, vma->vm_end - vma->vm_start);
440 atomic_dec(&dev->vma_count);
441
442 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
443 if (pt->vma == vma) {
444 list_del(&pt->head);
445 kfree(pt);
446 break;
447 }
448 }
449}
450
451
452
453
454
455
456
457
458
459static void drm_vm_close(struct vm_area_struct *vma)
460{
461 struct drm_file *priv = vma->vm_file->private_data;
462 struct drm_device *dev = priv->minor->dev;
463
464 mutex_lock(&dev->struct_mutex);
465 drm_vm_close_locked(dev, vma);
466 mutex_unlock(&dev->struct_mutex);
467}
468
469
470
471
472
473
474
475
476
477
478
479static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
480{
481 struct drm_file *priv = filp->private_data;
482 struct drm_device *dev;
483 struct drm_device_dma *dma;
484 unsigned long length = vma->vm_end - vma->vm_start;
485
486 dev = priv->minor->dev;
487 dma = dev->dma;
488 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
489 vma->vm_start, vma->vm_end, vma->vm_pgoff);
490
491
492 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
493 return -EINVAL;
494 }
495
496 if (!capable(CAP_SYS_ADMIN) &&
497 (dma->flags & _DRM_DMA_USE_PCI_RO)) {
498 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
499#if defined(__i386__) || defined(__x86_64__)
500 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
501#else
502
503
504
505 vma->vm_page_prot =
506 __pgprot(pte_val
507 (pte_wrprotect
508 (__pte(pgprot_val(vma->vm_page_prot)))));
509#endif
510 }
511
512 vma->vm_ops = &drm_vm_dma_ops;
513
514 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
515
516 drm_vm_open_locked(dev, vma);
517 return 0;
518}
519
520static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
521{
522#ifdef __alpha__
523 return dev->hose->dense_mem_base;
524#else
525 return 0;
526#endif
527}
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
543{
544 struct drm_file *priv = filp->private_data;
545 struct drm_device *dev = priv->minor->dev;
546 struct drm_local_map *map = NULL;
547 resource_size_t offset = 0;
548 struct drm_hash_item *hash;
549
550 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
551 vma->vm_start, vma->vm_end, vma->vm_pgoff);
552
553 if (!priv->authenticated)
554 return -EACCES;
555
556
557
558
559
560 if (!vma->vm_pgoff
561#if __OS_HAS_AGP
562 && (!dev->agp
563 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
564#endif
565 )
566 return drm_mmap_dma(filp, vma);
567
568 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
569 DRM_ERROR("Could not find map\n");
570 return -EINVAL;
571 }
572
573 map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
574 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
575 return -EPERM;
576
577
578 if (map->size < vma->vm_end - vma->vm_start)
579 return -EINVAL;
580
581 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
582 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
583#if defined(__i386__) || defined(__x86_64__)
584 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
585#else
586
587
588
589 vma->vm_page_prot =
590 __pgprot(pte_val
591 (pte_wrprotect
592 (__pte(pgprot_val(vma->vm_page_prot)))));
593#endif
594 }
595
596 switch (map->type) {
597#if !defined(__arm__)
598 case _DRM_AGP:
599 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
600
601
602
603
604
605#if defined(__powerpc__)
606 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
607#endif
608 vma->vm_ops = &drm_vm_ops;
609 break;
610 }
611
612#endif
613 case _DRM_FRAME_BUFFER:
614 case _DRM_REGISTERS:
615 offset = drm_core_get_reg_ofs(dev);
616 vma->vm_page_prot = drm_io_prot(map, vma);
617 if (io_remap_pfn_range(vma, vma->vm_start,
618 (map->offset + offset) >> PAGE_SHIFT,
619 vma->vm_end - vma->vm_start,
620 vma->vm_page_prot))
621 return -EAGAIN;
622 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
623 " offset = 0x%llx\n",
624 map->type,
625 vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
626
627 vma->vm_ops = &drm_vm_ops;
628 break;
629 case _DRM_CONSISTENT:
630
631
632 if (remap_pfn_range(vma, vma->vm_start,
633 page_to_pfn(virt_to_page(map->handle)),
634 vma->vm_end - vma->vm_start, vma->vm_page_prot))
635 return -EAGAIN;
636 vma->vm_page_prot = drm_dma_prot(map->type, vma);
637
638 case _DRM_SHM:
639 vma->vm_ops = &drm_vm_shm_ops;
640 vma->vm_private_data = (void *)map;
641 break;
642 case _DRM_SCATTER_GATHER:
643 vma->vm_ops = &drm_vm_sg_ops;
644 vma->vm_private_data = (void *)map;
645 vma->vm_page_prot = drm_dma_prot(map->type, vma);
646 break;
647 default:
648 return -EINVAL;
649 }
650 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
651
652 drm_vm_open_locked(dev, vma);
653 return 0;
654}
655
656int drm_mmap(struct file *filp, struct vm_area_struct *vma)
657{
658 struct drm_file *priv = filp->private_data;
659 struct drm_device *dev = priv->minor->dev;
660 int ret;
661
662 if (drm_device_is_unplugged(dev))
663 return -ENODEV;
664
665 mutex_lock(&dev->struct_mutex);
666 ret = drm_mmap_locked(filp, vma);
667 mutex_unlock(&dev->struct_mutex);
668
669 return ret;
670}
671EXPORT_SYMBOL(drm_mmap);
672