[deliverable/linux.git] / drivers / gpu / drm / ttm / ttm_tt.c

/**************************************************************************
 *
 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/
/*
 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
 */

#include <linux/sched.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/shmem_fs.h>
#include <linux/file.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <linux/export.h>
#include "drm_cache.h"
#include "drm_mem_util.h"
#include "ttm/ttm_module.h"
#include "ttm/ttm_bo_driver.h"
#include "ttm/ttm_placement.h"
#include "ttm/ttm_page_alloc.h"

/**
 * Allocates storage for pointers to the pages that back the ttm.
 */
static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
{
	ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(void*));
}

static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
{
	ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages, sizeof(void*));
	ttm->dma_address = drm_calloc_large(ttm->ttm.num_pages,
					    sizeof(*ttm->dma_address));
}

#ifdef CONFIG_X86
static inline int ttm_tt_set_page_caching(struct page *p,
					  enum ttm_caching_state c_old,
					  enum ttm_caching_state c_new)
{
	int ret = 0;

	if (PageHighMem(p))
		return 0;

	if (c_old != tt_cached) {
		/* p isn't in the default caching state, set it to
		 * writeback first to free its current memtype. */

		ret = set_pages_wb(p, 1);
		if (ret)
			return ret;
	}

	if (c_new == tt_wc)
		ret = set_memory_wc((unsigned long) page_address(p), 1);
	else if (c_new == tt_uncached)
		ret = set_pages_uc(p, 1);

	return ret;
}
#else /* CONFIG_X86 */
static inline int ttm_tt_set_page_caching(struct page *p,
					  enum ttm_caching_state c_old,
					  enum ttm_caching_state c_new)
{
	return 0;
}
#endif /* CONFIG_X86 */

/*
 * Change caching policy for the linear kernel map
 * for range of pages in a ttm.
 */

static int ttm_tt_set_caching(struct ttm_tt *ttm,
			      enum ttm_caching_state c_state)
{
	int i, j;
	struct page *cur_page;
	int ret;

	if (ttm->caching_state == c_state)
		return 0;

	if (ttm->state == tt_unpopulated) {
		/* Change caching but don't populate */
		ttm->caching_state = c_state;
		return 0;
	}

	if (ttm->caching_state == tt_cached)
		drm_clflush_pages(ttm->pages, ttm->num_pages);

	for (i = 0; i < ttm->num_pages; ++i) {
		cur_page = ttm->pages[i];
		if (likely(cur_page != NULL)) {
			ret = ttm_tt_set_page_caching(cur_page,
						      ttm->caching_state,
						      c_state);
			if (unlikely(ret != 0))
				goto out_err;
		}
	}

	ttm->caching_state = c_state;

	return 0;

out_err:
	for (j = 0; j < i; ++j) {
		cur_page = ttm->pages[j];
		if (likely(cur_page != NULL)) {
			(void)ttm_tt_set_page_caching(cur_page, c_state,
						      ttm->caching_state);
		}
	}

	return ret;
}

int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
{
	enum ttm_caching_state state;

	if (placement & TTM_PL_FLAG_WC)
		state = tt_wc;
	else if (placement & TTM_PL_FLAG_UNCACHED)
		state = tt_uncached;
	else
		state = tt_cached;

	return ttm_tt_set_caching(ttm, state);
}
EXPORT_SYMBOL(ttm_tt_set_placement_caching);

void ttm_tt_destroy(struct ttm_tt *ttm)
{
	if (unlikely(ttm == NULL))
		return;

	if (ttm->state == tt_bound) {
		ttm_tt_unbind(ttm);
	}

	if (likely(ttm->pages != NULL)) {
		ttm->bdev->driver->ttm_tt_unpopulate(ttm);
	}

	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
	    ttm->swap_storage)
		fput(ttm->swap_storage);

	ttm->swap_storage = NULL;
	ttm->func->destroy(ttm);
}

int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
		unsigned long size, uint32_t page_flags,
		struct page *dummy_read_page)
{
	ttm->bdev = bdev;
	ttm->glob = bdev->glob;
	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
	ttm->caching_state = tt_cached;
	ttm->page_flags = page_flags;
	ttm->dummy_read_page = dummy_read_page;
	ttm->state = tt_unpopulated;

	ttm_tt_alloc_page_directory(ttm);
	if (!ttm->pages) {
		ttm_tt_destroy(ttm);
		printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
		return -ENOMEM;
	}
	return 0;
}
EXPORT_SYMBOL(ttm_tt_init);

void ttm_tt_fini(struct ttm_tt *ttm)
{
	drm_free_large(ttm->pages);
	ttm->pages = NULL;
}
EXPORT_SYMBOL(ttm_tt_fini);

int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
		unsigned long size, uint32_t page_flags,
		struct page *dummy_read_page)
{
	struct ttm_tt *ttm = &ttm_dma->ttm;

	ttm->bdev = bdev;
	ttm->glob = bdev->glob;
	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
	ttm->caching_state = tt_cached;
	ttm->page_flags = page_flags;
	ttm->dummy_read_page = dummy_read_page;
	ttm->state = tt_unpopulated;

	INIT_LIST_HEAD(&ttm_dma->pages_list);
	ttm_dma_tt_alloc_page_directory(ttm_dma);
	if (!ttm->pages || !ttm_dma->dma_address) {
		ttm_tt_destroy(ttm);
		printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
		return -ENOMEM;
	}
	return 0;
}
EXPORT_SYMBOL(ttm_dma_tt_init);

void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
{
	struct ttm_tt *ttm = &ttm_dma->ttm;

	drm_free_large(ttm->pages);
	ttm->pages = NULL;
	drm_free_large(ttm_dma->dma_address);
	ttm_dma->dma_address = NULL;
}
EXPORT_SYMBOL(ttm_dma_tt_fini);

void ttm_tt_unbind(struct ttm_tt *ttm)
{
	int ret;

	if (ttm->state == tt_bound) {
		ret = ttm->func->unbind(ttm);
		BUG_ON(ret);
		ttm->state = tt_unbound;
	}
}

int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
{
	int ret = 0;

	if (!ttm)
		return -EINVAL;

	if (ttm->state == tt_bound)
		return 0;

	ret = ttm->bdev->driver->ttm_tt_populate(ttm);
	if (ret)
		return ret;

	ret = ttm->func->bind(ttm, bo_mem);
	if (unlikely(ret != 0))
		return ret;

	ttm->state = tt_bound;

	return 0;
}
EXPORT_SYMBOL(ttm_tt_bind);

int ttm_tt_swapin(struct ttm_tt *ttm)
{
	struct address_space *swap_space;
	struct file *swap_storage;
	struct page *from_page;
	struct page *to_page;
	void *from_virtual;
	void *to_virtual;
	int i;
	int ret = -ENOMEM;

	swap_storage = ttm->swap_storage;
	BUG_ON(swap_storage == NULL);

	swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;

	for (i = 0; i < ttm->num_pages; ++i) {
		from_page = shmem_read_mapping_page(swap_space, i);
		if (IS_ERR(from_page)) {
			ret = PTR_ERR(from_page);
			goto out_err;
		}
		to_page = ttm->pages[i];
		if (unlikely(to_page == NULL))
			goto out_err;

		preempt_disable();
		from_virtual = kmap_atomic(from_page, KM_USER0);
		to_virtual = kmap_atomic(to_page, KM_USER1);
		memcpy(to_virtual, from_virtual, PAGE_SIZE);
		kunmap_atomic(to_virtual, KM_USER1);
		kunmap_atomic(from_virtual, KM_USER0);
		preempt_enable();
		page_cache_release(from_page);
	}

	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
		fput(swap_storage);
	ttm->swap_storage = NULL;
	ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;

	return 0;
out_err:
	return ret;
}

int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
{
	struct address_space *swap_space;
	struct file *swap_storage;
	struct page *from_page;
	struct page *to_page;
	void *from_virtual;
	void *to_virtual;
	int i;
	int ret = -ENOMEM;

	BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
	BUG_ON(ttm->caching_state != tt_cached);

	if (!persistent_swap_storage) {
		swap_storage = shmem_file_setup("ttm swap",
						ttm->num_pages << PAGE_SHIFT,
						0);
		if (unlikely(IS_ERR(swap_storage))) {
			printk(KERN_ERR "Failed allocating swap storage.\n");
			return PTR_ERR(swap_storage);
		}
	} else
		swap_storage = persistent_swap_storage;

	swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;

	for (i = 0; i < ttm->num_pages; ++i) {
		from_page = ttm->pages[i];
		if (unlikely(from_page == NULL))
			continue;
		to_page = shmem_read_mapping_page(swap_space, i);
		if (unlikely(IS_ERR(to_page))) {
			ret = PTR_ERR(to_page);
			goto out_err;
		}
		preempt_disable();
		from_virtual = kmap_atomic(from_page, KM_USER0);
		to_virtual = kmap_atomic(to_page, KM_USER1);
		memcpy(to_virtual, from_virtual, PAGE_SIZE);
		kunmap_atomic(to_virtual, KM_USER1);
		kunmap_atomic(from_virtual, KM_USER0);
		preempt_enable();
		set_page_dirty(to_page);
		mark_page_accessed(to_page);
		page_cache_release(to_page);
	}

	ttm->bdev->driver->ttm_tt_unpopulate(ttm);
	ttm->swap_storage = swap_storage;
	ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
	if (persistent_swap_storage)
		ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;

	return 0;
out_err:
	if (!persistent_swap_storage)
		fput(swap_storage);

	return ret;
}
Commit	Line	Data
ba4e7d97 TH	1	/**************************************************************************
	2	*
	3	* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
	4	* All Rights Reserved.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the
	8	* "Software"), to deal in the Software without restriction, including
	9	* without limitation the rights to use, copy, modify, merge, publish,
	10	* distribute, sub license, and/or sell copies of the Software, and to
	11	* permit persons to whom the Software is furnished to do so, subject to
	12	* the following conditions:
	13	*
	14	* The above copyright notice and this permission notice (including the
	15	* next paragraph) shall be included in all copies or substantial portions
	16	* of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	21	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	22	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	23	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	24	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	25	*
	26	**************************************************************************/
	27	/*
	28	* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
	29	*/
	30
ba4e7d97 TH	31	#include <linux/sched.h>
	32	#include <linux/highmem.h>
	33	#include <linux/pagemap.h>
3142b651	34	#include <linux/shmem_fs.h>
ba4e7d97 TH	35	#include <linux/file.h>
ba4e7d97 TH	36	#include <linux/swap.h>
5a0e3ad6	37	#include <linux/slab.h>
2d1a8a48	38	#include <linux/export.h>
c9c97b8c	39	#include "drm_cache.h"
72e942dd	40	#include "drm_mem_util.h"
ba4e7d97 TH	41	#include "ttm/ttm_module.h"
	42	#include "ttm/ttm_bo_driver.h"
	43	#include "ttm/ttm_placement.h"
1403b1a3	44	#include "ttm/ttm_page_alloc.h"
ba4e7d97	45
ba4e7d97 TH	46	/**
ba4e7d97 TH	47	* Allocates storage for pointers to the pages that back the ttm.
ba4e7d97 TH	48	*/
	49	static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
	50	{
8e7e7052	51	ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(void*));
ba4e7d97 TH	52	}
ba4e7d97 TH	53
8e7e7052	54	static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
ba4e7d97	55	{
8e7e7052 JG	56	ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages, sizeof(void*));
	57	ttm->dma_address = drm_calloc_large(ttm->ttm.num_pages,
	58	sizeof(*ttm->dma_address));
ba4e7d97 TH	59	}
ba4e7d97 TH	60
ba4e7d97 TH	61	#ifdef CONFIG_X86
ba4e7d97 TH	62	static inline int ttm_tt_set_page_caching(struct page *p,
f0e2f38b FJ	63	enum ttm_caching_state c_old,
f0e2f38b FJ	64	enum ttm_caching_state c_new)
ba4e7d97	65	{
db78e27d FJ	66	int ret = 0;
db78e27d FJ	67
ba4e7d97 TH	68	if (PageHighMem(p))
	69	return 0;
	70
f0e2f38b	71	if (c_old != tt_cached) {
db78e27d FJ	72	/* p isn't in the default caching state, set it to
	73	* writeback first to free its current memtype. */
	74
	75	ret = set_pages_wb(p, 1);
	76	if (ret)
	77	return ret;
ba4e7d97	78	}
db78e27d	79
f0e2f38b	80	if (c_new == tt_wc)
db78e27d	81	ret = set_memory_wc((unsigned long) page_address(p), 1);
f0e2f38b	82	else if (c_new == tt_uncached)
db78e27d FJ	83	ret = set_pages_uc(p, 1);
	84
	85	return ret;
ba4e7d97 TH	86	}
	87	#else /* CONFIG_X86 */
	88	static inline int ttm_tt_set_page_caching(struct page *p,
f0e2f38b FJ	89	enum ttm_caching_state c_old,
f0e2f38b FJ	90	enum ttm_caching_state c_new)
ba4e7d97 TH	91	{
	92	return 0;
	93	}
	94	#endif /* CONFIG_X86 */
	95
	96	/*
	97	* Change caching policy for the linear kernel map
	98	* for range of pages in a ttm.
	99	*/
	100
	101	static int ttm_tt_set_caching(struct ttm_tt *ttm,
	102	enum ttm_caching_state c_state)
	103	{
	104	int i, j;
	105	struct page *cur_page;
	106	int ret;
	107
	108	if (ttm->caching_state == c_state)
	109	return 0;
	110
1403b1a3 PN	111	if (ttm->state == tt_unpopulated) {
	112	/* Change caching but don't populate */
	113	ttm->caching_state = c_state;
	114	return 0;
ba4e7d97 TH	115	}
	116
	117	if (ttm->caching_state == tt_cached)
c9c97b8c	118	drm_clflush_pages(ttm->pages, ttm->num_pages);
ba4e7d97 TH	119
	120	for (i = 0; i < ttm->num_pages; ++i) {
	121	cur_page = ttm->pages[i];
	122	if (likely(cur_page != NULL)) {
f0e2f38b FJ	123	ret = ttm_tt_set_page_caching(cur_page,
	124	ttm->caching_state,
	125	c_state);
ba4e7d97 TH	126	if (unlikely(ret != 0))
	127	goto out_err;
	128	}
	129	}
	130
	131	ttm->caching_state = c_state;
	132
	133	return 0;
	134
	135	out_err:
	136	for (j = 0; j < i; ++j) {
	137	cur_page = ttm->pages[j];
	138	if (likely(cur_page != NULL)) {
f0e2f38b	139	(void)ttm_tt_set_page_caching(cur_page, c_state,
ba4e7d97 TH	140	ttm->caching_state);
	141	}
	142	}
	143
	144	return ret;
	145	}
	146
	147	int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
	148	{
	149	enum ttm_caching_state state;
	150
	151	if (placement & TTM_PL_FLAG_WC)
	152	state = tt_wc;
	153	else if (placement & TTM_PL_FLAG_UNCACHED)
	154	state = tt_uncached;
	155	else
	156	state = tt_cached;
	157
	158	return ttm_tt_set_caching(ttm, state);
	159	}
df67bed9	160	EXPORT_SYMBOL(ttm_tt_set_placement_caching);
ba4e7d97	161
ba4e7d97 TH	162	void ttm_tt_destroy(struct ttm_tt *ttm)
ba4e7d97 TH	163	{
ba4e7d97 TH	164	if (unlikely(ttm == NULL))
	165	return;
	166
649bf3ca JG	167	if (ttm->state == tt_bound) {
649bf3ca JG	168	ttm_tt_unbind(ttm);
ba4e7d97 TH	169	}
	170
	171	if (likely(ttm->pages != NULL)) {
b1e5f172	172	ttm->bdev->driver->ttm_tt_unpopulate(ttm);
ba4e7d97 TH	173	}
ba4e7d97 TH	174
5df23979	175	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
ba4e7d97 TH	176	ttm->swap_storage)
	177	fput(ttm->swap_storage);
	178
649bf3ca JG	179	ttm->swap_storage = NULL;
649bf3ca JG	180	ttm->func->destroy(ttm);
ba4e7d97 TH	181	}
ba4e7d97 TH	182
649bf3ca JG	183	int ttm_tt_init(struct ttm_tt ttm, struct ttm_bo_device bdev,
	184	unsigned long size, uint32_t page_flags,
	185	struct page *dummy_read_page)
ba4e7d97	186	{
649bf3ca	187	ttm->bdev = bdev;
a987fcaa	188	ttm->glob = bdev->glob;
ba4e7d97	189	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
ba4e7d97 TH	190	ttm->caching_state = tt_cached;
ba4e7d97 TH	191	ttm->page_flags = page_flags;
ba4e7d97	192	ttm->dummy_read_page = dummy_read_page;
649bf3ca	193	ttm->state = tt_unpopulated;
ba4e7d97 TH	194
ba4e7d97 TH	195	ttm_tt_alloc_page_directory(ttm);
8e7e7052	196	if (!ttm->pages) {
ba4e7d97 TH	197	ttm_tt_destroy(ttm);
ba4e7d97 TH	198	printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
649bf3ca	199	return -ENOMEM;
ba4e7d97	200	}
649bf3ca	201	return 0;
ba4e7d97	202	}
649bf3ca	203	EXPORT_SYMBOL(ttm_tt_init);
ba4e7d97	204
8e7e7052 JG	205	void ttm_tt_fini(struct ttm_tt *ttm)
	206	{
	207	drm_free_large(ttm->pages);
	208	ttm->pages = NULL;
	209	}
	210	EXPORT_SYMBOL(ttm_tt_fini);
	211
	212	int ttm_dma_tt_init(struct ttm_dma_tt ttm_dma, struct ttm_bo_device bdev,
	213	unsigned long size, uint32_t page_flags,
	214	struct page *dummy_read_page)
	215	{
	216	struct ttm_tt *ttm = &ttm_dma->ttm;
	217
	218	ttm->bdev = bdev;
	219	ttm->glob = bdev->glob;
	220	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
	221	ttm->caching_state = tt_cached;
	222	ttm->page_flags = page_flags;
	223	ttm->dummy_read_page = dummy_read_page;
	224	ttm->state = tt_unpopulated;
	225
	226	INIT_LIST_HEAD(&ttm_dma->pages_list);
	227	ttm_dma_tt_alloc_page_directory(ttm_dma);
	228	if (!ttm->pages \|\| !ttm_dma->dma_address) {
	229	ttm_tt_destroy(ttm);
	230	printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
	231	return -ENOMEM;
	232	}
	233	return 0;
	234	}
	235	EXPORT_SYMBOL(ttm_dma_tt_init);
	236
	237	void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
	238	{
	239	struct ttm_tt *ttm = &ttm_dma->ttm;
	240
	241	drm_free_large(ttm->pages);
	242	ttm->pages = NULL;
	243	drm_free_large(ttm_dma->dma_address);
	244	ttm_dma->dma_address = NULL;
	245	}
	246	EXPORT_SYMBOL(ttm_dma_tt_fini);
	247
ba4e7d97 TH	248	void ttm_tt_unbind(struct ttm_tt *ttm)
	249	{
	250	int ret;
ba4e7d97 TH	251
ba4e7d97 TH	252	if (ttm->state == tt_bound) {
649bf3ca	253	ret = ttm->func->unbind(ttm);
ba4e7d97 TH	254	BUG_ON(ret);
	255	ttm->state = tt_unbound;
	256	}
	257	}
	258
	259	int ttm_tt_bind(struct ttm_tt ttm, struct ttm_mem_reg bo_mem)
	260	{
	261	int ret = 0;
ba4e7d97 TH	262
	263	if (!ttm)
	264	return -EINVAL;
	265
	266	if (ttm->state == tt_bound)
	267	return 0;
	268
b1e5f172	269	ret = ttm->bdev->driver->ttm_tt_populate(ttm);
ba4e7d97 TH	270	if (ret)
	271	return ret;
	272
649bf3ca	273	ret = ttm->func->bind(ttm, bo_mem);
7dcebb52	274	if (unlikely(ret != 0))
ba4e7d97	275	return ret;
ba4e7d97 TH	276
	277	ttm->state = tt_bound;
	278
ba4e7d97 TH	279	return 0;
	280	}
	281	EXPORT_SYMBOL(ttm_tt_bind);
	282
b1e5f172	283	int ttm_tt_swapin(struct ttm_tt *ttm)
ba4e7d97 TH	284	{
	285	struct address_space *swap_space;
	286	struct file *swap_storage;
	287	struct page *from_page;
	288	struct page *to_page;
	289	void *from_virtual;
	290	void *to_virtual;
	291	int i;
290e5505	292	int ret = -ENOMEM;
ba4e7d97	293
ba4e7d97 TH	294	swap_storage = ttm->swap_storage;
	295	BUG_ON(swap_storage == NULL);
	296
	297	swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
	298
	299	for (i = 0; i < ttm->num_pages; ++i) {
3142b651	300	from_page = shmem_read_mapping_page(swap_space, i);
290e5505 MM	301	if (IS_ERR(from_page)) {
290e5505 MM	302	ret = PTR_ERR(from_page);
ba4e7d97	303	goto out_err;
290e5505	304	}
b1e5f172	305	to_page = ttm->pages[i];
ba4e7d97 TH	306	if (unlikely(to_page == NULL))
	307	goto out_err;
	308
	309	preempt_disable();
	310	from_virtual = kmap_atomic(from_page, KM_USER0);
	311	to_virtual = kmap_atomic(to_page, KM_USER1);
	312	memcpy(to_virtual, from_virtual, PAGE_SIZE);
	313	kunmap_atomic(to_virtual, KM_USER1);
	314	kunmap_atomic(from_virtual, KM_USER0);
	315	preempt_enable();
	316	page_cache_release(from_page);
	317	}
	318
5df23979	319	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
ba4e7d97 TH	320	fput(swap_storage);
	321	ttm->swap_storage = NULL;
	322	ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
	323
	324	return 0;
	325	out_err:
290e5505	326	return ret;
ba4e7d97 TH	327	}
ba4e7d97 TH	328
5df23979	329	int ttm_tt_swapout(struct ttm_tt ttm, struct file persistent_swap_storage)
ba4e7d97 TH	330	{
	331	struct address_space *swap_space;
	332	struct file *swap_storage;
	333	struct page *from_page;
	334	struct page *to_page;
	335	void *from_virtual;
	336	void *to_virtual;
	337	int i;
290e5505	338	int ret = -ENOMEM;
ba4e7d97 TH	339
	340	BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
	341	BUG_ON(ttm->caching_state != tt_cached);
	342
5df23979	343	if (!persistent_swap_storage) {
ba4e7d97 TH	344	swap_storage = shmem_file_setup("ttm swap",
	345	ttm->num_pages << PAGE_SHIFT,
	346	0);
	347	if (unlikely(IS_ERR(swap_storage))) {
	348	printk(KERN_ERR "Failed allocating swap storage.\n");
290e5505	349	return PTR_ERR(swap_storage);
ba4e7d97 TH	350	}
ba4e7d97 TH	351	} else
5df23979	352	swap_storage = persistent_swap_storage;
ba4e7d97 TH	353
	354	swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
	355
	356	for (i = 0; i < ttm->num_pages; ++i) {
	357	from_page = ttm->pages[i];
	358	if (unlikely(from_page == NULL))
	359	continue;
3142b651	360	to_page = shmem_read_mapping_page(swap_space, i);
290e5505 MM	361	if (unlikely(IS_ERR(to_page))) {
290e5505 MM	362	ret = PTR_ERR(to_page);
ba4e7d97	363	goto out_err;
290e5505	364	}
ba4e7d97 TH	365	preempt_disable();
	366	from_virtual = kmap_atomic(from_page, KM_USER0);
	367	to_virtual = kmap_atomic(to_page, KM_USER1);
	368	memcpy(to_virtual, from_virtual, PAGE_SIZE);
	369	kunmap_atomic(to_virtual, KM_USER1);
	370	kunmap_atomic(from_virtual, KM_USER0);
	371	preempt_enable();
	372	set_page_dirty(to_page);
	373	mark_page_accessed(to_page);
	374	page_cache_release(to_page);
	375	}
	376
b1e5f172	377	ttm->bdev->driver->ttm_tt_unpopulate(ttm);
ba4e7d97 TH	378	ttm->swap_storage = swap_storage;
ba4e7d97 TH	379	ttm->page_flags \|= TTM_PAGE_FLAG_SWAPPED;
5df23979 JE	380	if (persistent_swap_storage)
5df23979 JE	381	ttm->page_flags \|= TTM_PAGE_FLAG_PERSISTENT_SWAP;
ba4e7d97 TH	382
	383	return 0;
	384	out_err:
5df23979	385	if (!persistent_swap_storage)
ba4e7d97 TH	386	fput(swap_storage);
ba4e7d97 TH	387
290e5505	388	return ret;
ba4e7d97	389	}