drm: reorganise minor number handling using backported modesetting code.
[linux-2.6/linux-loongson.git] / drivers / char / drm / drm_vm.c
blobc234c6f24a8d8fd157a1af029d530d5bbc09bd84
1 /**
2 * \file drm_vm.c
3 * Memory mapping for DRM
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
9 /*
10 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
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:
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.
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.
36 #include "drmP.h"
37 #if defined(__ia64__)
38 #include <linux/efi.h>
39 #endif
41 static void drm_vm_open(struct vm_area_struct *vma);
42 static void drm_vm_close(struct vm_area_struct *vma);
44 static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
46 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
48 #if defined(__i386__) || defined(__x86_64__)
49 if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) {
50 pgprot_val(tmp) |= _PAGE_PCD;
51 pgprot_val(tmp) &= ~_PAGE_PWT;
53 #elif defined(__powerpc__)
54 pgprot_val(tmp) |= _PAGE_NO_CACHE;
55 if (map_type == _DRM_REGISTERS)
56 pgprot_val(tmp) |= _PAGE_GUARDED;
57 #elif defined(__ia64__)
58 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
59 vma->vm_start))
60 tmp = pgprot_writecombine(tmp);
61 else
62 tmp = pgprot_noncached(tmp);
63 #elif defined(__sparc__)
64 tmp = pgprot_noncached(tmp);
65 #endif
66 return tmp;
69 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
71 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
73 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
74 tmp |= _PAGE_NO_CACHE;
75 #endif
76 return tmp;
79 /**
80 * \c fault method for AGP virtual memory.
82 * \param vma virtual memory area.
83 * \param address access address.
84 * \return pointer to the page structure.
86 * Find the right map and if it's AGP memory find the real physical page to
87 * map, get the page, increment the use count and return it.
89 #if __OS_HAS_AGP
90 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
92 struct drm_file *priv = vma->vm_file->private_data;
93 struct drm_device *dev = priv->minor->dev;
94 struct drm_map *map = NULL;
95 struct drm_map_list *r_list;
96 struct drm_hash_item *hash;
99 * Find the right map
101 if (!drm_core_has_AGP(dev))
102 goto vm_fault_error;
104 if (!dev->agp || !dev->agp->cant_use_aperture)
105 goto vm_fault_error;
107 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
108 goto vm_fault_error;
110 r_list = drm_hash_entry(hash, struct drm_map_list, hash);
111 map = r_list->map;
113 if (map && map->type == _DRM_AGP) {
115 * Using vm_pgoff as a selector forces us to use this unusual
116 * addressing scheme.
118 unsigned long offset = (unsigned long)vmf->virtual_address -
119 vma->vm_start;
120 unsigned long baddr = map->offset + offset;
121 struct drm_agp_mem *agpmem;
122 struct page *page;
124 #ifdef __alpha__
126 * Adjust to a bus-relative address
128 baddr -= dev->hose->mem_space->start;
129 #endif
132 * It's AGP memory - find the real physical page to map
134 list_for_each_entry(agpmem, &dev->agp->memory, head) {
135 if (agpmem->bound <= baddr &&
136 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
137 break;
140 if (!agpmem)
141 goto vm_fault_error;
144 * Get the page, inc the use count, and return it
146 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
147 page = virt_to_page(__va(agpmem->memory->memory[offset]));
148 get_page(page);
149 vmf->page = page;
151 DRM_DEBUG
152 ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
153 baddr, __va(agpmem->memory->memory[offset]), offset,
154 page_count(page));
155 return 0;
157 vm_fault_error:
158 return VM_FAULT_SIGBUS; /* Disallow mremap */
160 #else /* __OS_HAS_AGP */
161 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
163 return VM_FAULT_SIGBUS;
165 #endif /* __OS_HAS_AGP */
168 * \c nopage method for shared virtual memory.
170 * \param vma virtual memory area.
171 * \param address access address.
172 * \return pointer to the page structure.
174 * Get the mapping, find the real physical page to map, get the page, and
175 * return it.
177 static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
179 struct drm_map *map = (struct drm_map *) vma->vm_private_data;
180 unsigned long offset;
181 unsigned long i;
182 struct page *page;
184 if (!map)
185 return VM_FAULT_SIGBUS; /* Nothing allocated */
187 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
188 i = (unsigned long)map->handle + offset;
189 page = vmalloc_to_page((void *)i);
190 if (!page)
191 return VM_FAULT_SIGBUS;
192 get_page(page);
193 vmf->page = page;
195 DRM_DEBUG("shm_fault 0x%lx\n", offset);
196 return 0;
200 * \c close method for shared virtual memory.
202 * \param vma virtual memory area.
204 * Deletes map information if we are the last
205 * person to close a mapping and it's not in the global maplist.
207 static void drm_vm_shm_close(struct vm_area_struct *vma)
209 struct drm_file *priv = vma->vm_file->private_data;
210 struct drm_device *dev = priv->minor->dev;
211 struct drm_vma_entry *pt, *temp;
212 struct drm_map *map;
213 struct drm_map_list *r_list;
214 int found_maps = 0;
216 DRM_DEBUG("0x%08lx,0x%08lx\n",
217 vma->vm_start, vma->vm_end - vma->vm_start);
218 atomic_dec(&dev->vma_count);
220 map = vma->vm_private_data;
222 mutex_lock(&dev->struct_mutex);
223 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
224 if (pt->vma->vm_private_data == map)
225 found_maps++;
226 if (pt->vma == vma) {
227 list_del(&pt->head);
228 drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
232 /* We were the only map that was found */
233 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
234 /* Check to see if we are in the maplist, if we are not, then
235 * we delete this mappings information.
237 found_maps = 0;
238 list_for_each_entry(r_list, &dev->maplist, head) {
239 if (r_list->map == map)
240 found_maps++;
243 if (!found_maps) {
244 drm_dma_handle_t dmah;
246 switch (map->type) {
247 case _DRM_REGISTERS:
248 case _DRM_FRAME_BUFFER:
249 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
250 int retcode;
251 retcode = mtrr_del(map->mtrr,
252 map->offset,
253 map->size);
254 DRM_DEBUG("mtrr_del = %d\n", retcode);
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;
271 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
274 mutex_unlock(&dev->struct_mutex);
278 * \c fault method for DMA virtual memory.
280 * \param vma virtual memory area.
281 * \param address access address.
282 * \return pointer to the page structure.
284 * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
286 static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
288 struct drm_file *priv = vma->vm_file->private_data;
289 struct drm_device *dev = priv->minor->dev;
290 struct drm_device_dma *dma = dev->dma;
291 unsigned long offset;
292 unsigned long page_nr;
293 struct page *page;
295 if (!dma)
296 return VM_FAULT_SIGBUS; /* Error */
297 if (!dma->pagelist)
298 return VM_FAULT_SIGBUS; /* Nothing allocated */
300 offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
301 page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
302 page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
304 get_page(page);
305 vmf->page = page;
307 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
308 return 0;
312 * \c fault method for scatter-gather virtual memory.
314 * \param vma virtual memory area.
315 * \param address access address.
316 * \return pointer to the page structure.
318 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
320 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
322 struct drm_map *map = (struct drm_map *) vma->vm_private_data;
323 struct drm_file *priv = vma->vm_file->private_data;
324 struct drm_device *dev = priv->minor->dev;
325 struct drm_sg_mem *entry = dev->sg;
326 unsigned long offset;
327 unsigned long map_offset;
328 unsigned long page_offset;
329 struct page *page;
331 if (!entry)
332 return VM_FAULT_SIGBUS; /* Error */
333 if (!entry->pagelist)
334 return VM_FAULT_SIGBUS; /* Nothing allocated */
336 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
337 map_offset = map->offset - (unsigned long)dev->sg->virtual;
338 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
339 page = entry->pagelist[page_offset];
340 get_page(page);
341 vmf->page = page;
343 return 0;
346 static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
348 return drm_do_vm_fault(vma, vmf);
351 static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
353 return drm_do_vm_shm_fault(vma, vmf);
356 static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
358 return drm_do_vm_dma_fault(vma, vmf);
361 static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
363 return drm_do_vm_sg_fault(vma, vmf);
366 /** AGP virtual memory operations */
367 static struct vm_operations_struct drm_vm_ops = {
368 .fault = drm_vm_fault,
369 .open = drm_vm_open,
370 .close = drm_vm_close,
373 /** Shared virtual memory operations */
374 static 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,
380 /** DMA virtual memory operations */
381 static struct vm_operations_struct drm_vm_dma_ops = {
382 .fault = drm_vm_dma_fault,
383 .open = drm_vm_open,
384 .close = drm_vm_close,
387 /** Scatter-gather virtual memory operations */
388 static struct vm_operations_struct drm_vm_sg_ops = {
389 .fault = drm_vm_sg_fault,
390 .open = drm_vm_open,
391 .close = drm_vm_close,
395 * \c open method for shared virtual memory.
397 * \param vma virtual memory area.
399 * Create a new drm_vma_entry structure as the \p vma private data entry and
400 * add it to drm_device::vmalist.
402 static void drm_vm_open_locked(struct vm_area_struct *vma)
404 struct drm_file *priv = vma->vm_file->private_data;
405 struct drm_device *dev = priv->minor->dev;
406 struct drm_vma_entry *vma_entry;
408 DRM_DEBUG("0x%08lx,0x%08lx\n",
409 vma->vm_start, vma->vm_end - vma->vm_start);
410 atomic_inc(&dev->vma_count);
412 vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
413 if (vma_entry) {
414 vma_entry->vma = vma;
415 vma_entry->pid = current->pid;
416 list_add(&vma_entry->head, &dev->vmalist);
420 static void drm_vm_open(struct vm_area_struct *vma)
422 struct drm_file *priv = vma->vm_file->private_data;
423 struct drm_device *dev = priv->minor->dev;
425 mutex_lock(&dev->struct_mutex);
426 drm_vm_open_locked(vma);
427 mutex_unlock(&dev->struct_mutex);
431 * \c close method for all virtual memory types.
433 * \param vma virtual memory area.
435 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
436 * free it.
438 static void drm_vm_close(struct vm_area_struct *vma)
440 struct drm_file *priv = vma->vm_file->private_data;
441 struct drm_device *dev = priv->minor->dev;
442 struct drm_vma_entry *pt, *temp;
444 DRM_DEBUG("0x%08lx,0x%08lx\n",
445 vma->vm_start, vma->vm_end - vma->vm_start);
446 atomic_dec(&dev->vma_count);
448 mutex_lock(&dev->struct_mutex);
449 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
450 if (pt->vma == vma) {
451 list_del(&pt->head);
452 drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
453 break;
456 mutex_unlock(&dev->struct_mutex);
460 * mmap DMA memory.
462 * \param file_priv DRM file private.
463 * \param vma virtual memory area.
464 * \return zero on success or a negative number on failure.
466 * Sets the virtual memory area operations structure to vm_dma_ops, the file
467 * pointer, and calls vm_open().
469 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
471 struct drm_file *priv = filp->private_data;
472 struct drm_device *dev;
473 struct drm_device_dma *dma;
474 unsigned long length = vma->vm_end - vma->vm_start;
476 dev = priv->minor->dev;
477 dma = dev->dma;
478 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
479 vma->vm_start, vma->vm_end, vma->vm_pgoff);
481 /* Length must match exact page count */
482 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
483 return -EINVAL;
486 if (!capable(CAP_SYS_ADMIN) &&
487 (dma->flags & _DRM_DMA_USE_PCI_RO)) {
488 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
489 #if defined(__i386__) || defined(__x86_64__)
490 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
491 #else
492 /* Ye gads this is ugly. With more thought
493 we could move this up higher and use
494 `protection_map' instead. */
495 vma->vm_page_prot =
496 __pgprot(pte_val
497 (pte_wrprotect
498 (__pte(pgprot_val(vma->vm_page_prot)))));
499 #endif
502 vma->vm_ops = &drm_vm_dma_ops;
504 vma->vm_flags |= VM_RESERVED; /* Don't swap */
505 vma->vm_flags |= VM_DONTEXPAND;
507 vma->vm_file = filp; /* Needed for drm_vm_open() */
508 drm_vm_open_locked(vma);
509 return 0;
512 unsigned long drm_core_get_map_ofs(struct drm_map * map)
514 return map->offset;
517 EXPORT_SYMBOL(drm_core_get_map_ofs);
519 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
521 #ifdef __alpha__
522 return dev->hose->dense_mem_base - dev->hose->mem_space->start;
523 #else
524 return 0;
525 #endif
528 EXPORT_SYMBOL(drm_core_get_reg_ofs);
531 * mmap DMA memory.
533 * \param file_priv DRM file private.
534 * \param vma virtual memory area.
535 * \return zero on success or a negative number on failure.
537 * If the virtual memory area has no offset associated with it then it's a DMA
538 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
539 * checks that the restricted flag is not set, sets the virtual memory operations
540 * according to the mapping type and remaps the pages. Finally sets the file
541 * pointer and calls vm_open().
543 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
545 struct drm_file *priv = filp->private_data;
546 struct drm_device *dev = priv->minor->dev;
547 struct drm_map *map = NULL;
548 unsigned long offset = 0;
549 struct drm_hash_item *hash;
551 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
552 vma->vm_start, vma->vm_end, vma->vm_pgoff);
554 if (!priv->authenticated)
555 return -EACCES;
557 /* We check for "dma". On Apple's UniNorth, it's valid to have
558 * the AGP mapped at physical address 0
559 * --BenH.
561 if (!vma->vm_pgoff
562 #if __OS_HAS_AGP
563 && (!dev->agp
564 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
565 #endif
567 return drm_mmap_dma(filp, vma);
569 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
570 DRM_ERROR("Could not find map\n");
571 return -EINVAL;
574 map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
575 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
576 return -EPERM;
578 /* Check for valid size. */
579 if (map->size < vma->vm_end - vma->vm_start)
580 return -EINVAL;
582 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
583 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
584 #if defined(__i386__) || defined(__x86_64__)
585 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
586 #else
587 /* Ye gads this is ugly. With more thought
588 we could move this up higher and use
589 `protection_map' instead. */
590 vma->vm_page_prot =
591 __pgprot(pte_val
592 (pte_wrprotect
593 (__pte(pgprot_val(vma->vm_page_prot)))));
594 #endif
597 switch (map->type) {
598 case _DRM_AGP:
599 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
601 * On some platforms we can't talk to bus dma address from the CPU, so for
602 * memory of type DRM_AGP, we'll deal with sorting out the real physical
603 * pages and mappings in fault()
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;
611 /* fall through to _DRM_FRAME_BUFFER... */
612 case _DRM_FRAME_BUFFER:
613 case _DRM_REGISTERS:
614 offset = dev->driver->get_reg_ofs(dev);
615 vma->vm_flags |= VM_IO; /* not in core dump */
616 vma->vm_page_prot = drm_io_prot(map->type, 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%lx\n",
624 map->type,
625 vma->vm_start, vma->vm_end, map->offset + offset);
626 vma->vm_ops = &drm_vm_ops;
627 break;
628 case _DRM_CONSISTENT:
629 /* Consistent memory is really like shared memory. But
630 * it's allocated in a different way, so avoid fault */
631 if (remap_pfn_range(vma, vma->vm_start,
632 page_to_pfn(virt_to_page(map->handle)),
633 vma->vm_end - vma->vm_start, vma->vm_page_prot))
634 return -EAGAIN;
635 vma->vm_page_prot = drm_dma_prot(map->type, vma);
636 /* fall through to _DRM_SHM */
637 case _DRM_SHM:
638 vma->vm_ops = &drm_vm_shm_ops;
639 vma->vm_private_data = (void *)map;
640 /* Don't let this area swap. Change when
641 DRM_KERNEL advisory is supported. */
642 vma->vm_flags |= VM_RESERVED;
643 break;
644 case _DRM_SCATTER_GATHER:
645 vma->vm_ops = &drm_vm_sg_ops;
646 vma->vm_private_data = (void *)map;
647 vma->vm_flags |= VM_RESERVED;
648 vma->vm_page_prot = drm_dma_prot(map->type, vma);
649 break;
650 default:
651 return -EINVAL; /* This should never happen. */
653 vma->vm_flags |= VM_RESERVED; /* Don't swap */
654 vma->vm_flags |= VM_DONTEXPAND;
656 vma->vm_file = filp; /* Needed for drm_vm_open() */
657 drm_vm_open_locked(vma);
658 return 0;
661 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
663 struct drm_file *priv = filp->private_data;
664 struct drm_device *dev = priv->minor->dev;
665 int ret;
667 mutex_lock(&dev->struct_mutex);
668 ret = drm_mmap_locked(filp, vma);
669 mutex_unlock(&dev->struct_mutex);
671 return ret;
673 EXPORT_SYMBOL(drm_mmap);