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/drivers/gpu/drm/drm_vm.c

https://bitbucket.org/cresqo/cm7-p500-kernel
C | 700 lines | 452 code | 82 blank | 166 comment | 64 complexity | 54d76f89e95d8d46580a9969d9ef784a MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  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 * Copyright (c) 2009, Code Aurora Forum.
 15 * All Rights Reserved.
 16 *
 17 * Permission is hereby granted, free of charge, to any person obtaining a
 18 * copy of this software and associated documentation files (the "Software"),
 19 * to deal in the Software without restriction, including without limitation
 20 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 21 * and/or sell copies of the Software, and to permit persons to whom the
 22 * Software is furnished to do so, subject to the following conditions:
 23 *
 24 * The above copyright notice and this permission notice (including the next
 25 * paragraph) shall be included in all copies or substantial portions of the
 26 * Software.
 27 *
 28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 31 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 32 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 33 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 34 * OTHER DEALINGS IN THE SOFTWARE.
 35 */
 36
 37#include "drmP.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)
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 vm_area_struct *vma)
410{
411	struct drm_file *priv = vma->vm_file->private_data;
412	struct drm_device *dev = priv->minor->dev;
413	struct drm_vma_entry *vma_entry;
414
415	DRM_DEBUG("0x%08lx,0x%08lx\n",
416		  vma->vm_start, vma->vm_end - vma->vm_start);
417	atomic_inc(&dev->vma_count);
418
419	vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
420	if (vma_entry) {
421		vma_entry->vma = vma;
422		vma_entry->pid = current->pid;
423		list_add(&vma_entry->head, &dev->vmalist);
424	}
425}
426
427static void drm_vm_open(struct vm_area_struct *vma)
428{
429	struct drm_file *priv = vma->vm_file->private_data;
430	struct drm_device *dev = priv->minor->dev;
431
432	mutex_lock(&dev->struct_mutex);
433	drm_vm_open_locked(vma);
434	mutex_unlock(&dev->struct_mutex);
435}
436
437void drm_vm_close_locked(struct vm_area_struct *vma)
438{
439	struct drm_file *priv = vma->vm_file->private_data;
440	struct drm_device *dev = priv->minor->dev;
441	struct drm_vma_entry *pt, *temp;
442
443	DRM_DEBUG("0x%08lx,0x%08lx\n",
444		  vma->vm_start, vma->vm_end - vma->vm_start);
445	atomic_dec(&dev->vma_count);
446
447	list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
448		if (pt->vma == vma) {
449			list_del(&pt->head);
450			kfree(pt);
451			break;
452		}
453	}
454}
455
456/**
457 * \c close method for all virtual memory types.
458 *
459 * \param vma virtual memory area.
460 *
461 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
462 * free it.
463 */
464static void drm_vm_close(struct vm_area_struct *vma)
465{
466	struct drm_file *priv = vma->vm_file->private_data;
467	struct drm_device *dev = priv->minor->dev;
468
469	mutex_lock(&dev->struct_mutex);
470	drm_vm_close_locked(vma);
471	mutex_unlock(&dev->struct_mutex);
472}
473
474/**
475 * mmap DMA memory.
476 *
477 * \param file_priv DRM file private.
478 * \param vma virtual memory area.
479 * \return zero on success or a negative number on failure.
480 *
481 * Sets the virtual memory area operations structure to vm_dma_ops, the file
482 * pointer, and calls vm_open().
483 */
484static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
485{
486	struct drm_file *priv = filp->private_data;
487	struct drm_device *dev;
488	struct drm_device_dma *dma;
489	unsigned long length = vma->vm_end - vma->vm_start;
490
491	dev = priv->minor->dev;
492	dma = dev->dma;
493	DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
494		  vma->vm_start, vma->vm_end, vma->vm_pgoff);
495
496	/* Length must match exact page count */
497	if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
498		return -EINVAL;
499	}
500
501	if (!capable(CAP_SYS_ADMIN) &&
502	    (dma->flags & _DRM_DMA_USE_PCI_RO)) {
503		vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
504#if defined(__i386__) || defined(__x86_64__)
505		pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
506#else
507		/* Ye gads this is ugly.  With more thought
508		   we could move this up higher and use
509		   `protection_map' instead.  */
510		vma->vm_page_prot =
511		    __pgprot(pte_val
512			     (pte_wrprotect
513			      (__pte(pgprot_val(vma->vm_page_prot)))));
514#endif
515	}
516
517	vma->vm_ops = &drm_vm_dma_ops;
518
519	vma->vm_flags |= VM_RESERVED;	/* Don't swap */
520	vma->vm_flags |= VM_DONTEXPAND;
521
522	vma->vm_file = filp;	/* Needed for drm_vm_open() */
523	drm_vm_open_locked(vma);
524	return 0;
525}
526
527resource_size_t drm_core_get_map_ofs(struct drm_local_map * map)
528{
529	return map->offset;
530}
531
532EXPORT_SYMBOL(drm_core_get_map_ofs);
533
534resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
535{
536#ifdef __alpha__
537	return dev->hose->dense_mem_base - dev->hose->mem_space->start;
538#else
539	return 0;
540#endif
541}
542
543EXPORT_SYMBOL(drm_core_get_reg_ofs);
544
545/**
546 * mmap DMA memory.
547 *
548 * \param file_priv DRM file private.
549 * \param vma virtual memory area.
550 * \return zero on success or a negative number on failure.
551 *
552 * If the virtual memory area has no offset associated with it then it's a DMA
553 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
554 * checks that the restricted flag is not set, sets the virtual memory operations
555 * according to the mapping type and remaps the pages. Finally sets the file
556 * pointer and calls vm_open().
557 */
558int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
559{
560	struct drm_file *priv = filp->private_data;
561	struct drm_device *dev = priv->minor->dev;
562	struct drm_local_map *map = NULL;
563	resource_size_t offset = 0;
564	struct drm_hash_item *hash;
565
566	DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
567		  vma->vm_start, vma->vm_end, vma->vm_pgoff);
568
569	if (!priv->authenticated)
570		return -EACCES;
571
572	/* We check for "dma". On Apple's UniNorth, it's valid to have
573	 * the AGP mapped at physical address 0
574	 * --BenH.
575	 */
576	if (!vma->vm_pgoff
577#if __OS_HAS_AGP
578	    && (!dev->agp
579		|| dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
580#endif
581	    )
582		return drm_mmap_dma(filp, vma);
583
584	if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
585		DRM_ERROR("Could not find map\n");
586		return -EINVAL;
587	}
588
589	map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
590	if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
591		return -EPERM;
592
593	/* Check for valid size. */
594	if (map->size < vma->vm_end - vma->vm_start)
595		return -EINVAL;
596
597	if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
598		vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
599#if defined(__i386__) || defined(__x86_64__)
600		pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
601#else
602		/* Ye gads this is ugly.  With more thought
603		   we could move this up higher and use
604		   `protection_map' instead.  */
605		vma->vm_page_prot =
606		    __pgprot(pte_val
607			     (pte_wrprotect
608			      (__pte(pgprot_val(vma->vm_page_prot)))));
609#endif
610	}
611
612	switch (map->type) {
613#if !defined(__arm__)
614	case _DRM_AGP:
615		if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
616			/*
617			 * On some platforms we can't talk to bus dma address from the CPU, so for
618			 * memory of type DRM_AGP, we'll deal with sorting out the real physical
619			 * pages and mappings in fault()
620			 */
621#if defined(__powerpc__)
622			pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
623#endif
624			vma->vm_ops = &drm_vm_ops;
625			break;
626		}
627		/* fall through to _DRM_FRAME_BUFFER... */
628#endif
629	case _DRM_FRAME_BUFFER:
630	case _DRM_REGISTERS:
631		offset = dev->driver->get_reg_ofs(dev);
632		vma->vm_flags |= VM_IO;	/* not in core dump */
633		vma->vm_page_prot = drm_io_prot(map->type, vma);
634#if !defined(__arm__)
635		if (io_remap_pfn_range(vma, vma->vm_start,
636				       (map->offset + offset) >> PAGE_SHIFT,
637				       vma->vm_end - vma->vm_start,
638				       vma->vm_page_prot))
639			return -EAGAIN;
640#else
641		if (remap_pfn_range(vma, vma->vm_start,
642					(map->offset + offset) >> PAGE_SHIFT,
643					vma->vm_end - vma->vm_start,
644					vma->vm_page_prot))
645			return -EAGAIN;
646#endif
647
648		DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
649			  " offset = 0x%llx\n",
650			  map->type,
651			  vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
652
653		vma->vm_ops = &drm_vm_ops;
654		break;
655	case _DRM_CONSISTENT:
656		/* Consistent memory is really like shared memory. But
657		 * it's allocated in a different way, so avoid fault */
658		if (remap_pfn_range(vma, vma->vm_start,
659		    page_to_pfn(virt_to_page(map->handle)),
660		    vma->vm_end - vma->vm_start, vma->vm_page_prot))
661			return -EAGAIN;
662		vma->vm_page_prot = drm_dma_prot(map->type, vma);
663	/* fall through to _DRM_SHM */
664	case _DRM_SHM:
665		vma->vm_ops = &drm_vm_shm_ops;
666		vma->vm_private_data = (void *)map;
667		/* Don't let this area swap.  Change when
668		   DRM_KERNEL advisory is supported. */
669		vma->vm_flags |= VM_RESERVED;
670		break;
671	case _DRM_SCATTER_GATHER:
672		vma->vm_ops = &drm_vm_sg_ops;
673		vma->vm_private_data = (void *)map;
674		vma->vm_flags |= VM_RESERVED;
675		vma->vm_page_prot = drm_dma_prot(map->type, vma);
676		break;
677	default:
678		return -EINVAL;	/* This should never happen. */
679	}
680	vma->vm_flags |= VM_RESERVED;	/* Don't swap */
681	vma->vm_flags |= VM_DONTEXPAND;
682
683	vma->vm_file = filp;	/* Needed for drm_vm_open() */
684	drm_vm_open_locked(vma);
685	return 0;
686}
687
688int drm_mmap(struct file *filp, struct vm_area_struct *vma)
689{
690	struct drm_file *priv = filp->private_data;
691	struct drm_device *dev = priv->minor->dev;
692	int ret;
693
694	mutex_lock(&dev->struct_mutex);
695	ret = drm_mmap_locked(filp, vma);
696	mutex_unlock(&dev->struct_mutex);
697
698	return ret;
699}
700EXPORT_SYMBOL(drm_mmap);