[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(*ttm->ttm.pages) +
					  sizeof(*ttm->dma_address) +
					  sizeof(*ttm->cpu_address));
	ttm->cpu_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
	ttm->dma_address = (void *) (ttm->cpu_address + ttm->ttm.num_pages);
}

#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_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;
	ttm_dma->cpu_address = NULL;
	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);
		put_page(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 (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 (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);
		put_page(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	{
3d50d4dc AC	58	ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages,
	59	sizeof(*ttm->ttm.pages) +
	60	sizeof(*ttm->dma_address) +
	61	sizeof(*ttm->cpu_address));
	62	ttm->cpu_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
	63	ttm->dma_address = (void *) (ttm->cpu_address + ttm->ttm.num_pages);
ba4e7d97 TH	64	}
ba4e7d97 TH	65
ba4e7d97 TH	66	#ifdef CONFIG_X86
ba4e7d97 TH	67	static inline int ttm_tt_set_page_caching(struct page *p,
f0e2f38b FJ	68	enum ttm_caching_state c_old,
f0e2f38b FJ	69	enum ttm_caching_state c_new)
ba4e7d97	70	{
db78e27d FJ	71	int ret = 0;
db78e27d FJ	72
ba4e7d97 TH	73	if (PageHighMem(p))
	74	return 0;
	75
f0e2f38b	76	if (c_old != tt_cached) {
db78e27d FJ	77	/* p isn't in the default caching state, set it to
	78	* writeback first to free its current memtype. */
	79
	80	ret = set_pages_wb(p, 1);
	81	if (ret)
	82	return ret;
ba4e7d97	83	}
db78e27d	84
f0e2f38b	85	if (c_new == tt_wc)
db78e27d	86	ret = set_memory_wc((unsigned long) page_address(p), 1);
f0e2f38b	87	else if (c_new == tt_uncached)
db78e27d FJ	88	ret = set_pages_uc(p, 1);
	89
	90	return ret;
ba4e7d97 TH	91	}
	92	#else /* CONFIG_X86 */
	93	static inline int ttm_tt_set_page_caching(struct page *p,
f0e2f38b FJ	94	enum ttm_caching_state c_old,
f0e2f38b FJ	95	enum ttm_caching_state c_new)
ba4e7d97 TH	96	{
	97	return 0;
	98	}
	99	#endif /* CONFIG_X86 */
	100
	101	/*
	102	* Change caching policy for the linear kernel map
	103	* for range of pages in a ttm.
	104	*/
	105
	106	static int ttm_tt_set_caching(struct ttm_tt *ttm,
	107	enum ttm_caching_state c_state)
	108	{
	109	int i, j;
	110	struct page *cur_page;
	111	int ret;
	112
	113	if (ttm->caching_state == c_state)
	114	return 0;
	115
1403b1a3 PN	116	if (ttm->state == tt_unpopulated) {
	117	/* Change caching but don't populate */
	118	ttm->caching_state = c_state;
	119	return 0;
ba4e7d97 TH	120	}
	121
	122	if (ttm->caching_state == tt_cached)
c9c97b8c	123	drm_clflush_pages(ttm->pages, ttm->num_pages);
ba4e7d97 TH	124
	125	for (i = 0; i < ttm->num_pages; ++i) {
	126	cur_page = ttm->pages[i];
	127	if (likely(cur_page != NULL)) {
f0e2f38b FJ	128	ret = ttm_tt_set_page_caching(cur_page,
	129	ttm->caching_state,
	130	c_state);
ba4e7d97 TH	131	if (unlikely(ret != 0))
	132	goto out_err;
	133	}
	134	}
	135
	136	ttm->caching_state = c_state;
	137
	138	return 0;
	139
	140	out_err:
	141	for (j = 0; j < i; ++j) {
	142	cur_page = ttm->pages[j];
	143	if (likely(cur_page != NULL)) {
f0e2f38b	144	(void)ttm_tt_set_page_caching(cur_page, c_state,
ba4e7d97 TH	145	ttm->caching_state);
	146	}
	147	}
	148
	149	return ret;
	150	}
	151
	152	int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
	153	{
	154	enum ttm_caching_state state;
	155
	156	if (placement & TTM_PL_FLAG_WC)
	157	state = tt_wc;
	158	else if (placement & TTM_PL_FLAG_UNCACHED)
	159	state = tt_uncached;
	160	else
	161	state = tt_cached;
	162
	163	return ttm_tt_set_caching(ttm, state);
	164	}
df67bed9	165	EXPORT_SYMBOL(ttm_tt_set_placement_caching);
ba4e7d97	166
ba4e7d97 TH	167	void ttm_tt_destroy(struct ttm_tt *ttm)
ba4e7d97 TH	168	{
ba4e7d97 TH	169	if (unlikely(ttm == NULL))
	170	return;
	171
649bf3ca JG	172	if (ttm->state == tt_bound) {
649bf3ca JG	173	ttm_tt_unbind(ttm);
ba4e7d97 TH	174	}
ba4e7d97 TH	175
58aa6622 TH	176	if (ttm->state == tt_unbound)
58aa6622 TH	177	ttm_tt_unpopulate(ttm);
ba4e7d97	178
5df23979	179	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
ba4e7d97 TH	180	ttm->swap_storage)
	181	fput(ttm->swap_storage);
	182
649bf3ca JG	183	ttm->swap_storage = NULL;
649bf3ca JG	184	ttm->func->destroy(ttm);
ba4e7d97 TH	185	}
ba4e7d97 TH	186
649bf3ca JG	187	int ttm_tt_init(struct ttm_tt ttm, struct ttm_bo_device bdev,
	188	unsigned long size, uint32_t page_flags,
	189	struct page *dummy_read_page)
ba4e7d97	190	{
649bf3ca	191	ttm->bdev = bdev;
a987fcaa	192	ttm->glob = bdev->glob;
ba4e7d97	193	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
ba4e7d97 TH	194	ttm->caching_state = tt_cached;
ba4e7d97 TH	195	ttm->page_flags = page_flags;
ba4e7d97	196	ttm->dummy_read_page = dummy_read_page;
649bf3ca	197	ttm->state = tt_unpopulated;
dea7e0ac	198	ttm->swap_storage = NULL;
ba4e7d97 TH	199
ba4e7d97 TH	200	ttm_tt_alloc_page_directory(ttm);
8e7e7052	201	if (!ttm->pages) {
ba4e7d97	202	ttm_tt_destroy(ttm);
25d0479a	203	pr_err("Failed allocating page table\n");
649bf3ca	204	return -ENOMEM;
ba4e7d97	205	}
649bf3ca	206	return 0;
ba4e7d97	207	}
649bf3ca	208	EXPORT_SYMBOL(ttm_tt_init);
ba4e7d97	209
8e7e7052 JG	210	void ttm_tt_fini(struct ttm_tt *ttm)
	211	{
	212	drm_free_large(ttm->pages);
	213	ttm->pages = NULL;
	214	}
	215	EXPORT_SYMBOL(ttm_tt_fini);
	216
	217	int ttm_dma_tt_init(struct ttm_dma_tt ttm_dma, struct ttm_bo_device bdev,
	218	unsigned long size, uint32_t page_flags,
	219	struct page *dummy_read_page)
	220	{
	221	struct ttm_tt *ttm = &ttm_dma->ttm;
	222
	223	ttm->bdev = bdev;
	224	ttm->glob = bdev->glob;
	225	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
	226	ttm->caching_state = tt_cached;
	227	ttm->page_flags = page_flags;
	228	ttm->dummy_read_page = dummy_read_page;
	229	ttm->state = tt_unpopulated;
dea7e0ac	230	ttm->swap_storage = NULL;
8e7e7052 JG	231
	232	INIT_LIST_HEAD(&ttm_dma->pages_list);
	233	ttm_dma_tt_alloc_page_directory(ttm_dma);
3d50d4dc	234	if (!ttm->pages) {
8e7e7052	235	ttm_tt_destroy(ttm);
25d0479a	236	pr_err("Failed allocating page table\n");
8e7e7052 JG	237	return -ENOMEM;
	238	}
	239	return 0;
	240	}
	241	EXPORT_SYMBOL(ttm_dma_tt_init);
	242
	243	void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
	244	{
	245	struct ttm_tt *ttm = &ttm_dma->ttm;
	246
	247	drm_free_large(ttm->pages);
	248	ttm->pages = NULL;
3d50d4dc	249	ttm_dma->cpu_address = NULL;
8e7e7052 JG	250	ttm_dma->dma_address = NULL;
	251	}
	252	EXPORT_SYMBOL(ttm_dma_tt_fini);
	253
ba4e7d97 TH	254	void ttm_tt_unbind(struct ttm_tt *ttm)
	255	{
	256	int ret;
ba4e7d97 TH	257
ba4e7d97 TH	258	if (ttm->state == tt_bound) {
649bf3ca	259	ret = ttm->func->unbind(ttm);
ba4e7d97 TH	260	BUG_ON(ret);
	261	ttm->state = tt_unbound;
	262	}
	263	}
	264
	265	int ttm_tt_bind(struct ttm_tt ttm, struct ttm_mem_reg bo_mem)
	266	{
	267	int ret = 0;
ba4e7d97 TH	268
	269	if (!ttm)
	270	return -EINVAL;
	271
	272	if (ttm->state == tt_bound)
	273	return 0;
	274
b1e5f172	275	ret = ttm->bdev->driver->ttm_tt_populate(ttm);
ba4e7d97 TH	276	if (ret)
	277	return ret;
	278
649bf3ca	279	ret = ttm->func->bind(ttm, bo_mem);
7dcebb52	280	if (unlikely(ret != 0))
ba4e7d97	281	return ret;
ba4e7d97 TH	282
	283	ttm->state = tt_bound;
	284
ba4e7d97 TH	285	return 0;
	286	}
	287	EXPORT_SYMBOL(ttm_tt_bind);
	288
b1e5f172	289	int ttm_tt_swapin(struct ttm_tt *ttm)
ba4e7d97 TH	290	{
	291	struct address_space *swap_space;
	292	struct file *swap_storage;
	293	struct page *from_page;
	294	struct page *to_page;
ba4e7d97	295	int i;
290e5505	296	int ret = -ENOMEM;
ba4e7d97	297
ba4e7d97 TH	298	swap_storage = ttm->swap_storage;
	299	BUG_ON(swap_storage == NULL);
	300
496ad9aa	301	swap_space = file_inode(swap_storage)->i_mapping;
ba4e7d97 TH	302
ba4e7d97 TH	303	for (i = 0; i < ttm->num_pages; ++i) {
3142b651	304	from_page = shmem_read_mapping_page(swap_space, i);
290e5505 MM	305	if (IS_ERR(from_page)) {
290e5505 MM	306	ret = PTR_ERR(from_page);
ba4e7d97	307	goto out_err;
290e5505	308	}
b1e5f172	309	to_page = ttm->pages[i];
ba4e7d97 TH	310	if (unlikely(to_page == NULL))
	311	goto out_err;
	312
259a290e	313	copy_highpage(to_page, from_page);
09cbfeaf	314	put_page(from_page);
ba4e7d97 TH	315	}
ba4e7d97 TH	316
5df23979	317	if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
ba4e7d97 TH	318	fput(swap_storage);
	319	ttm->swap_storage = NULL;
	320	ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
	321
	322	return 0;
	323	out_err:
290e5505	324	return ret;
ba4e7d97 TH	325	}
ba4e7d97 TH	326
5df23979	327	int ttm_tt_swapout(struct ttm_tt ttm, struct file persistent_swap_storage)
ba4e7d97 TH	328	{
	329	struct address_space *swap_space;
	330	struct file *swap_storage;
	331	struct page *from_page;
	332	struct page *to_page;
ba4e7d97	333	int i;
290e5505	334	int ret = -ENOMEM;
ba4e7d97 TH	335
	336	BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
	337	BUG_ON(ttm->caching_state != tt_cached);
	338
5df23979	339	if (!persistent_swap_storage) {
ba4e7d97 TH	340	swap_storage = shmem_file_setup("ttm swap",
	341	ttm->num_pages << PAGE_SHIFT,
	342	0);
55579cfe	343	if (IS_ERR(swap_storage)) {
25d0479a	344	pr_err("Failed allocating swap storage\n");
290e5505	345	return PTR_ERR(swap_storage);
ba4e7d97 TH	346	}
ba4e7d97 TH	347	} else
5df23979	348	swap_storage = persistent_swap_storage;
ba4e7d97	349
496ad9aa	350	swap_space = file_inode(swap_storage)->i_mapping;
ba4e7d97 TH	351
	352	for (i = 0; i < ttm->num_pages; ++i) {
	353	from_page = ttm->pages[i];
	354	if (unlikely(from_page == NULL))
	355	continue;
3142b651	356	to_page = shmem_read_mapping_page(swap_space, i);
55579cfe	357	if (IS_ERR(to_page)) {
290e5505	358	ret = PTR_ERR(to_page);
ba4e7d97	359	goto out_err;
290e5505	360	}
259a290e	361	copy_highpage(to_page, from_page);
ba4e7d97 TH	362	set_page_dirty(to_page);
ba4e7d97 TH	363	mark_page_accessed(to_page);
09cbfeaf	364	put_page(to_page);
ba4e7d97 TH	365	}
ba4e7d97 TH	366
58aa6622	367	ttm_tt_unpopulate(ttm);
ba4e7d97 TH	368	ttm->swap_storage = swap_storage;
ba4e7d97 TH	369	ttm->page_flags \|= TTM_PAGE_FLAG_SWAPPED;
5df23979 JE	370	if (persistent_swap_storage)
5df23979 JE	371	ttm->page_flags \|= TTM_PAGE_FLAG_PERSISTENT_SWAP;
ba4e7d97 TH	372
	373	return 0;
	374	out_err:
5df23979	375	if (!persistent_swap_storage)
ba4e7d97 TH	376	fput(swap_storage);
ba4e7d97 TH	377
290e5505	378	return ret;
ba4e7d97	379	}
58aa6622 TH	380
	381	static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
	382	{
	383	pgoff_t i;
	384	struct page **page = ttm->pages;
	385
1b76af5c TH	386	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
	387	return;
	388
58aa6622 TH	389	for (i = 0; i < ttm->num_pages; ++i) {
	390	(*page)->mapping = NULL;
	391	(*page++)->index = 0;
	392	}
	393	}
	394
	395	void ttm_tt_unpopulate(struct ttm_tt *ttm)
	396	{
	397	if (ttm->state == tt_unpopulated)
	398	return;
	399
	400	ttm_tt_clear_mapping(ttm);
	401	ttm->bdev->driver->ttm_tt_unpopulate(ttm);
	402	}