[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>
 */

#define pr_fmt(fmt) "[TTM] " fmt

#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/drm_cache.h>
#include <drm/drm_mem_util.h>
#include <drm/ttm/ttm_module.h>
#include <drm/ttm/ttm_bo_driver.h>
#include <drm/ttm/ttm_placement.h>
#include <drm/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 (ttm->state == tt_unbound)
		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->swap_storage = NULL;

	ttm_tt_alloc_page_directory(ttm);
	if (!ttm->pages) {
		ttm_tt_destroy(ttm);
		pr_err("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;
	ttm->swap_storage = NULL;

	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);
		pr_err("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;
	int i;
	int ret = -ENOMEM;

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

	swap_space = file_inode(swap_storage)->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;

		copy_highpage(to_page, from_page);
		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;
	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))) {
			pr_err("Failed allocating swap storage\n");
			return PTR_ERR(swap_storage);
		}
	} else
		swap_storage = persistent_swap_storage;

	swap_space = file_inode(swap_storage)->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;
		}
		copy_highpage(to_page, from_page);
		set_page_dirty(to_page);
		mark_page_accessed(to_page);
		page_cache_release(to_page);
	}

	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;
}

static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
{
	pgoff_t i;
	struct page **page = ttm->pages;

	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
		return;

	for (i = 0; i < ttm->num_pages; ++i) {
		(*page)->mapping = NULL;
		(*page++)->index = 0;
	}
}

void ttm_tt_unpopulate(struct ttm_tt *ttm)
{
	if (ttm->state == tt_unpopulated)
		return;

	ttm_tt_clear_mapping(ttm);
	ttm->bdev->driver->ttm_tt_unpopulate(ttm);
}
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
25d0479a JP	31	#define pr_fmt(fmt) "[TTM] " fmt
25d0479a JP	32
ba4e7d97 TH	33	#include <linux/sched.h>
	34	#include <linux/highmem.h>
	35	#include <linux/pagemap.h>
3142b651	36	#include <linux/shmem_fs.h>
ba4e7d97 TH	37	#include <linux/file.h>
ba4e7d97 TH	38	#include <linux/swap.h>
5a0e3ad6	39	#include <linux/slab.h>
2d1a8a48	40	#include <linux/export.h>
760285e7 DH	41	#include <drm/drm_cache.h>
	42	#include <drm/drm_mem_util.h>
	43	#include <drm/ttm/ttm_module.h>
	44	#include <drm/ttm/ttm_bo_driver.h>
	45	#include <drm/ttm/ttm_placement.h>
	46	#include <drm/ttm/ttm_page_alloc.h>
ba4e7d97	47
ba4e7d97 TH	48	/**
ba4e7d97 TH	49	* Allocates storage for pointers to the pages that back the ttm.
ba4e7d97 TH	50	*/
	51	static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
	52	{
8e7e7052	53	ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(void*));
ba4e7d97 TH	54	}
ba4e7d97 TH	55
8e7e7052	56	static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
ba4e7d97	57	{
8e7e7052 JG	58	ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages, sizeof(void*));
	59	ttm->dma_address = drm_calloc_large(ttm->ttm.num_pages,
	60	sizeof(*ttm->dma_address));
ba4e7d97 TH	61	}
ba4e7d97 TH	62
ba4e7d97 TH	63	#ifdef CONFIG_X86
ba4e7d97 TH	64	static inline int ttm_tt_set_page_caching(struct page *p,
f0e2f38b FJ	65	enum ttm_caching_state c_old,
f0e2f38b FJ	66	enum ttm_caching_state c_new)
ba4e7d97	67	{
db78e27d FJ	68	int ret = 0;
db78e27d FJ	69
ba4e7d97 TH	70	if (PageHighMem(p))
	71	return 0;
	72
f0e2f38b	73	if (c_old != tt_cached) {
db78e27d FJ	74	/* p isn't in the default caching state, set it to
	75	* writeback first to free its current memtype. */
	76
	77	ret = set_pages_wb(p, 1);
	78	if (ret)
	79	return ret;
ba4e7d97	80	}
db78e27d	81
f0e2f38b	82	if (c_new == tt_wc)
db78e27d	83	ret = set_memory_wc((unsigned long) page_address(p), 1);
f0e2f38b	84	else if (c_new == tt_uncached)
db78e27d FJ	85	ret = set_pages_uc(p, 1);
	86
	87	return ret;
ba4e7d97 TH	88	}
	89	#else /* CONFIG_X86 */
	90	static inline int ttm_tt_set_page_caching(struct page *p,
f0e2f38b FJ	91	enum ttm_caching_state c_old,
f0e2f38b FJ	92	enum ttm_caching_state c_new)
ba4e7d97 TH	93	{
	94	return 0;
	95	}
	96	#endif /* CONFIG_X86 */
	97
	98	/*
	99	* Change caching policy for the linear kernel map
	100	* for range of pages in a ttm.
	101	*/
	102
	103	static int ttm_tt_set_caching(struct ttm_tt *ttm,
	104	enum ttm_caching_state c_state)
	105	{
	106	int i, j;
	107	struct page *cur_page;
	108	int ret;
	109
	110	if (ttm->caching_state == c_state)
	111	return 0;
	112
1403b1a3 PN	113	if (ttm->state == tt_unpopulated) {
	114	/* Change caching but don't populate */
	115	ttm->caching_state = c_state;
	116	return 0;
ba4e7d97 TH	117	}
	118
	119	if (ttm->caching_state == tt_cached)
c9c97b8c	120	drm_clflush_pages(ttm->pages, ttm->num_pages);
ba4e7d97 TH	121
	122	for (i = 0; i < ttm->num_pages; ++i) {
	123	cur_page = ttm->pages[i];
	124	if (likely(cur_page != NULL)) {
f0e2f38b FJ	125	ret = ttm_tt_set_page_caching(cur_page,
	126	ttm->caching_state,
	127	c_state);
ba4e7d97 TH	128	if (unlikely(ret != 0))
	129	goto out_err;
	130	}
	131	}
	132
	133	ttm->caching_state = c_state;
	134
	135	return 0;
	136
	137	out_err:
	138	for (j = 0; j < i; ++j) {
	139	cur_page = ttm->pages[j];
	140	if (likely(cur_page != NULL)) {
f0e2f38b	141	(void)ttm_tt_set_page_caching(cur_page, c_state,
ba4e7d97 TH	142	ttm->caching_state);
	143	}
	144	}
	145
	146	return ret;
	147	}
	148
	149	int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
	150	{
	151	enum ttm_caching_state state;
	152
	153	if (placement & TTM_PL_FLAG_WC)
	154	state = tt_wc;
	155	else if (placement & TTM_PL_FLAG_UNCACHED)
	156	state = tt_uncached;
	157	else
	158	state = tt_cached;
	159
	160	return ttm_tt_set_caching(ttm, state);
	161	}
df67bed9	162	EXPORT_SYMBOL(ttm_tt_set_placement_caching);
ba4e7d97	163
ba4e7d97 TH	164	void ttm_tt_destroy(struct ttm_tt *ttm)
ba4e7d97 TH	165	{
ba4e7d97 TH	166	if (unlikely(ttm == NULL))
	167	return;
	168
649bf3ca JG	169	if (ttm->state == tt_bound) {
649bf3ca JG	170	ttm_tt_unbind(ttm);
ba4e7d97 TH	171	}
ba4e7d97 TH	172
58aa6622 TH	173	if (ttm->state == tt_unbound)
58aa6622 TH	174	ttm_tt_unpopulate(ttm);
ba4e7d97	175
5df23979	176	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
ba4e7d97 TH	177	ttm->swap_storage)
	178	fput(ttm->swap_storage);
	179
649bf3ca JG	180	ttm->swap_storage = NULL;
649bf3ca JG	181	ttm->func->destroy(ttm);
ba4e7d97 TH	182	}
ba4e7d97 TH	183
649bf3ca JG	184	int ttm_tt_init(struct ttm_tt ttm, struct ttm_bo_device bdev,
	185	unsigned long size, uint32_t page_flags,
	186	struct page *dummy_read_page)
ba4e7d97	187	{
649bf3ca	188	ttm->bdev = bdev;
a987fcaa	189	ttm->glob = bdev->glob;
ba4e7d97	190	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
ba4e7d97 TH	191	ttm->caching_state = tt_cached;
ba4e7d97 TH	192	ttm->page_flags = page_flags;
ba4e7d97	193	ttm->dummy_read_page = dummy_read_page;
649bf3ca	194	ttm->state = tt_unpopulated;
dea7e0ac	195	ttm->swap_storage = NULL;
ba4e7d97 TH	196
ba4e7d97 TH	197	ttm_tt_alloc_page_directory(ttm);
8e7e7052	198	if (!ttm->pages) {
ba4e7d97	199	ttm_tt_destroy(ttm);
25d0479a	200	pr_err("Failed allocating page table\n");
649bf3ca	201	return -ENOMEM;
ba4e7d97	202	}
649bf3ca	203	return 0;
ba4e7d97	204	}
649bf3ca	205	EXPORT_SYMBOL(ttm_tt_init);
ba4e7d97	206
8e7e7052 JG	207	void ttm_tt_fini(struct ttm_tt *ttm)
	208	{
	209	drm_free_large(ttm->pages);
	210	ttm->pages = NULL;
	211	}
	212	EXPORT_SYMBOL(ttm_tt_fini);
	213
	214	int ttm_dma_tt_init(struct ttm_dma_tt ttm_dma, struct ttm_bo_device bdev,
	215	unsigned long size, uint32_t page_flags,
	216	struct page *dummy_read_page)
	217	{
	218	struct ttm_tt *ttm = &ttm_dma->ttm;
	219
	220	ttm->bdev = bdev;
	221	ttm->glob = bdev->glob;
	222	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
	223	ttm->caching_state = tt_cached;
	224	ttm->page_flags = page_flags;
	225	ttm->dummy_read_page = dummy_read_page;
	226	ttm->state = tt_unpopulated;
dea7e0ac	227	ttm->swap_storage = NULL;
8e7e7052 JG	228
	229	INIT_LIST_HEAD(&ttm_dma->pages_list);
	230	ttm_dma_tt_alloc_page_directory(ttm_dma);
	231	if (!ttm->pages \|\| !ttm_dma->dma_address) {
	232	ttm_tt_destroy(ttm);
25d0479a	233	pr_err("Failed allocating page table\n");
8e7e7052 JG	234	return -ENOMEM;
	235	}
	236	return 0;
	237	}
	238	EXPORT_SYMBOL(ttm_dma_tt_init);
	239
	240	void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
	241	{
	242	struct ttm_tt *ttm = &ttm_dma->ttm;
	243
	244	drm_free_large(ttm->pages);
	245	ttm->pages = NULL;
	246	drm_free_large(ttm_dma->dma_address);
	247	ttm_dma->dma_address = NULL;
	248	}
	249	EXPORT_SYMBOL(ttm_dma_tt_fini);
	250
ba4e7d97 TH	251	void ttm_tt_unbind(struct ttm_tt *ttm)
	252	{
	253	int ret;
ba4e7d97 TH	254
ba4e7d97 TH	255	if (ttm->state == tt_bound) {
649bf3ca	256	ret = ttm->func->unbind(ttm);
ba4e7d97 TH	257	BUG_ON(ret);
	258	ttm->state = tt_unbound;
	259	}
	260	}
	261
	262	int ttm_tt_bind(struct ttm_tt ttm, struct ttm_mem_reg bo_mem)
	263	{
	264	int ret = 0;
ba4e7d97 TH	265
	266	if (!ttm)
	267	return -EINVAL;
	268
	269	if (ttm->state == tt_bound)
	270	return 0;
	271
b1e5f172	272	ret = ttm->bdev->driver->ttm_tt_populate(ttm);
ba4e7d97 TH	273	if (ret)
	274	return ret;
	275
649bf3ca	276	ret = ttm->func->bind(ttm, bo_mem);
7dcebb52	277	if (unlikely(ret != 0))
ba4e7d97	278	return ret;
ba4e7d97 TH	279
	280	ttm->state = tt_bound;
	281
ba4e7d97 TH	282	return 0;
	283	}
	284	EXPORT_SYMBOL(ttm_tt_bind);
	285
b1e5f172	286	int ttm_tt_swapin(struct ttm_tt *ttm)
ba4e7d97 TH	287	{
	288	struct address_space *swap_space;
	289	struct file *swap_storage;
	290	struct page *from_page;
	291	struct page *to_page;
ba4e7d97	292	int i;
290e5505	293	int ret = -ENOMEM;
ba4e7d97	294
ba4e7d97 TH	295	swap_storage = ttm->swap_storage;
	296	BUG_ON(swap_storage == NULL);
	297
496ad9aa	298	swap_space = file_inode(swap_storage)->i_mapping;
ba4e7d97 TH	299
ba4e7d97 TH	300	for (i = 0; i < ttm->num_pages; ++i) {
3142b651	301	from_page = shmem_read_mapping_page(swap_space, i);
290e5505 MM	302	if (IS_ERR(from_page)) {
290e5505 MM	303	ret = PTR_ERR(from_page);
ba4e7d97	304	goto out_err;
290e5505	305	}
b1e5f172	306	to_page = ttm->pages[i];
ba4e7d97 TH	307	if (unlikely(to_page == NULL))
	308	goto out_err;
	309
259a290e	310	copy_highpage(to_page, from_page);
ba4e7d97 TH	311	page_cache_release(from_page);
	312	}
	313
5df23979	314	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
ba4e7d97 TH	315	fput(swap_storage);
	316	ttm->swap_storage = NULL;
	317	ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
	318
	319	return 0;
	320	out_err:
290e5505	321	return ret;
ba4e7d97 TH	322	}
ba4e7d97 TH	323
5df23979	324	int ttm_tt_swapout(struct ttm_tt ttm, struct file persistent_swap_storage)
ba4e7d97 TH	325	{
	326	struct address_space *swap_space;
	327	struct file *swap_storage;
	328	struct page *from_page;
	329	struct page *to_page;
ba4e7d97	330	int i;
290e5505	331	int ret = -ENOMEM;
ba4e7d97 TH	332
	333	BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
	334	BUG_ON(ttm->caching_state != tt_cached);
	335
5df23979	336	if (!persistent_swap_storage) {
ba4e7d97 TH	337	swap_storage = shmem_file_setup("ttm swap",
	338	ttm->num_pages << PAGE_SHIFT,
	339	0);
	340	if (unlikely(IS_ERR(swap_storage))) {
25d0479a	341	pr_err("Failed allocating swap storage\n");
290e5505	342	return PTR_ERR(swap_storage);
ba4e7d97 TH	343	}
ba4e7d97 TH	344	} else
5df23979	345	swap_storage = persistent_swap_storage;
ba4e7d97	346
496ad9aa	347	swap_space = file_inode(swap_storage)->i_mapping;
ba4e7d97 TH	348
	349	for (i = 0; i < ttm->num_pages; ++i) {
	350	from_page = ttm->pages[i];
	351	if (unlikely(from_page == NULL))
	352	continue;
3142b651	353	to_page = shmem_read_mapping_page(swap_space, i);
290e5505 MM	354	if (unlikely(IS_ERR(to_page))) {
290e5505 MM	355	ret = PTR_ERR(to_page);
ba4e7d97	356	goto out_err;
290e5505	357	}
259a290e	358	copy_highpage(to_page, from_page);
ba4e7d97 TH	359	set_page_dirty(to_page);
	360	mark_page_accessed(to_page);
	361	page_cache_release(to_page);
	362	}
	363
58aa6622	364	ttm_tt_unpopulate(ttm);
ba4e7d97 TH	365	ttm->swap_storage = swap_storage;
ba4e7d97 TH	366	ttm->page_flags \|= TTM_PAGE_FLAG_SWAPPED;
5df23979 JE	367	if (persistent_swap_storage)
5df23979 JE	368	ttm->page_flags \|= TTM_PAGE_FLAG_PERSISTENT_SWAP;
ba4e7d97 TH	369
	370	return 0;
	371	out_err:
5df23979	372	if (!persistent_swap_storage)
ba4e7d97 TH	373	fput(swap_storage);
ba4e7d97 TH	374
290e5505	375	return ret;
ba4e7d97	376	}
58aa6622 TH	377
	378	static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
	379	{
	380	pgoff_t i;
	381	struct page **page = ttm->pages;
	382
1b76af5c TH	383	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
	384	return;
	385
58aa6622 TH	386	for (i = 0; i < ttm->num_pages; ++i) {
	387	(*page)->mapping = NULL;
	388	(*page++)->index = 0;
	389	}
	390	}
	391
	392	void ttm_tt_unpopulate(struct ttm_tt *ttm)
	393	{
	394	if (ttm->state == tt_unpopulated)
	395	return;
	396
	397	ttm_tt_clear_mapping(ttm);
	398	ttm->bdev->driver->ttm_tt_unpopulate(ttm);
	399	}