[linux-2.6-block.git] / drivers / gpu / drm / ttm / ttm_tt.c

/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/**************************************************************************
 *
 * 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/pagemap.h>
#include <linux/shmem_fs.h>
#include <linux/file.h>
#include <drm/drm_cache.h>
#include <drm/ttm/ttm_bo_driver.h>

/*
 * Allocates a ttm structure for the given BO.
 */
int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
{
	struct ttm_bo_device *bdev = bo->bdev;
	uint32_t page_flags = 0;

	dma_resv_assert_held(bo->base.resv);

	if (bo->ttm)
		return 0;

	switch (bo->type) {
	case ttm_bo_type_device:
		if (zero_alloc)
			page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
		break;
	case ttm_bo_type_kernel:
		break;
	case ttm_bo_type_sg:
		page_flags |= TTM_PAGE_FLAG_SG;
		break;
	default:
		pr_err("Illegal buffer object type\n");
		return -EINVAL;
	}

	bo->ttm = bdev->driver->ttm_tt_create(bo, page_flags);
	if (unlikely(bo->ttm == NULL))
		return -ENOMEM;

	return 0;
}

/*
 * Allocates storage for pointers to the pages that back the ttm.
 */
static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
{
	ttm->pages = kvmalloc_array(ttm->num_pages, sizeof(void*),
			GFP_KERNEL | __GFP_ZERO);
	if (!ttm->pages)
		return -ENOMEM;
	return 0;
}

static int ttm_dma_tt_alloc_page_directory(struct ttm_tt *ttm)
{
	ttm->pages = kvmalloc_array(ttm->num_pages,
				    sizeof(*ttm->pages) +
				    sizeof(*ttm->dma_address),
				    GFP_KERNEL | __GFP_ZERO);
	if (!ttm->pages)
		return -ENOMEM;

	ttm->dma_address = (void *)(ttm->pages + ttm->num_pages);
	return 0;
}

static int ttm_sg_tt_alloc_page_directory(struct ttm_tt *ttm)
{
	ttm->dma_address = kvmalloc_array(ttm->num_pages,
					  sizeof(*ttm->dma_address),
					  GFP_KERNEL | __GFP_ZERO);
	if (!ttm->dma_address)
		return -ENOMEM;
	return 0;
}

void ttm_tt_destroy_common(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
{
	ttm_tt_unpopulate(bdev, ttm);

	if (ttm->swap_storage)
		fput(ttm->swap_storage);

	ttm->swap_storage = NULL;
}
EXPORT_SYMBOL(ttm_tt_destroy_common);

void ttm_tt_destroy(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
{
	bdev->driver->ttm_tt_destroy(bdev, ttm);
}

static void ttm_tt_init_fields(struct ttm_tt *ttm,
			       struct ttm_buffer_object *bo,
			       uint32_t page_flags,
			       enum ttm_caching caching)
{
	ttm->num_pages = bo->num_pages;
	ttm->caching = ttm_cached;
	ttm->page_flags = page_flags;
	ttm->dma_address = NULL;
	ttm->swap_storage = NULL;
	ttm->sg = bo->sg;
	ttm->caching = caching;
}

int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
		uint32_t page_flags, enum ttm_caching caching)
{
	ttm_tt_init_fields(ttm, bo, page_flags, caching);

	if (ttm_tt_alloc_page_directory(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)
{
	if (ttm->pages)
		kvfree(ttm->pages);
	else
		kvfree(ttm->dma_address);
	ttm->pages = NULL;
	ttm->dma_address = NULL;
}
EXPORT_SYMBOL(ttm_tt_fini);

int ttm_dma_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
		    uint32_t page_flags, enum ttm_caching caching)
{
	ttm_tt_init_fields(ttm, bo, page_flags, caching);

	if (ttm_dma_tt_alloc_page_directory(ttm)) {
		pr_err("Failed allocating page table\n");
		return -ENOMEM;
	}
	return 0;
}
EXPORT_SYMBOL(ttm_dma_tt_init);

int ttm_sg_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
		   uint32_t page_flags, enum ttm_caching caching)
{
	int ret;

	ttm_tt_init_fields(ttm, bo, page_flags, caching);

	if (page_flags & TTM_PAGE_FLAG_SG)
		ret = ttm_sg_tt_alloc_page_directory(ttm);
	else
		ret = ttm_dma_tt_alloc_page_directory(ttm);
	if (ret) {
		pr_err("Failed allocating page table\n");
		return -ENOMEM;
	}
	return 0;
}
EXPORT_SYMBOL(ttm_sg_tt_init);

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;
	gfp_t gfp_mask;
	int i, ret;

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

	swap_space = swap_storage->f_mapping;
	gfp_mask = mapping_gfp_mask(swap_space);

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

		copy_highpage(to_page, from_page);
		put_page(from_page);
	}

	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_bo_device *bdev, struct ttm_tt *ttm)
{
	struct address_space *swap_space;
	struct file *swap_storage;
	struct page *from_page;
	struct page *to_page;
	gfp_t gfp_mask;
	int i, ret;

	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);
	}

	swap_space = swap_storage->f_mapping;
	gfp_mask = mapping_gfp_mask(swap_space);

	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_gfp(swap_space, i, gfp_mask);
		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(bdev, ttm);
	ttm->swap_storage = swap_storage;
	ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;

	return 0;

out_err:
	fput(swap_storage);

	return ret;
}

static void ttm_tt_add_mapping(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
{
	pgoff_t i;

	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
		return;

	for (i = 0; i < ttm->num_pages; ++i)
		ttm->pages[i]->mapping = bdev->dev_mapping;
}

int ttm_tt_populate(struct ttm_bo_device *bdev,
		    struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
{
	int ret;

	if (!ttm)
		return -EINVAL;

	if (ttm_tt_is_populated(ttm))
		return 0;

	if (bdev->driver->ttm_tt_populate)
		ret = bdev->driver->ttm_tt_populate(bdev, ttm, ctx);
	else
		ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
	if (ret)
		return ret;

	ttm_tt_add_mapping(bdev, ttm);
	ttm->page_flags |= TTM_PAGE_FLAG_PRIV_POPULATED;
	if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
		ret = ttm_tt_swapin(ttm);
		if (unlikely(ret != 0)) {
			ttm_tt_unpopulate(bdev, ttm);
			return ret;
		}
	}

	return 0;
}
EXPORT_SYMBOL(ttm_tt_populate);

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_bo_device *bdev,
		       struct ttm_tt *ttm)
{
	if (!ttm_tt_is_populated(ttm))
		return;

	ttm_tt_clear_mapping(ttm);
	if (bdev->driver->ttm_tt_unpopulate)
		bdev->driver->ttm_tt_unpopulate(bdev, ttm);
	else
		ttm_pool_free(&bdev->pool, ttm);
	ttm->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED;
}
Commit	Line	Data
1297bf2e	1	/* SPDX-License-Identifier: GPL-2.0 OR MIT */
ba4e7d97 TH	2	/**************************************************************************
	3	*
	4	* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
	5	* All Rights Reserved.
	6	*
	7	* Permission is hereby granted, free of charge, to any person obtaining a
	8	* copy of this software and associated documentation files (the
	9	* "Software"), to deal in the Software without restriction, including
	10	* without limitation the rights to use, copy, modify, merge, publish,
	11	* distribute, sub license, and/or sell copies of the Software, and to
	12	* permit persons to whom the Software is furnished to do so, subject to
	13	* the following conditions:
	14	*
	15	* The above copyright notice and this permission notice (including the
	16	* next paragraph) shall be included in all copies or substantial portions
	17	* of the Software.
	18	*
	19	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	20	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	21	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	22	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	23	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	24	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	25	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	26	*
	27	**************************************************************************/
	28	/*
	29	* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
	30	*/
	31
25d0479a JP	32	#define pr_fmt(fmt) "[TTM] " fmt
25d0479a JP	33
ba4e7d97	34	#include <linux/sched.h>
ba4e7d97	35	#include <linux/pagemap.h>
3142b651	36	#include <linux/shmem_fs.h>
ba4e7d97	37	#include <linux/file.h>
760285e7	38	#include <drm/drm_cache.h>
760285e7	39	#include <drm/ttm/ttm_bo_driver.h>
ba4e7d97	40
78616b88	41	/*
97b7e1b8 CK	42	* Allocates a ttm structure for the given BO.
	43	*/
	44	int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
	45	{
	46	struct ttm_bo_device *bdev = bo->bdev;
97b7e1b8 CK	47	uint32_t page_flags = 0;
97b7e1b8 CK	48
52791eee	49	dma_resv_assert_held(bo->base.resv);
97b7e1b8	50
0b062865 CK	51	if (bo->ttm)
	52	return 0;
	53
97b7e1b8 CK	54	switch (bo->type) {
	55	case ttm_bo_type_device:
	56	if (zero_alloc)
	57	page_flags \|= TTM_PAGE_FLAG_ZERO_ALLOC;
45a9d154	58	break;
97b7e1b8	59	case ttm_bo_type_kernel:
97b7e1b8 CK	60	break;
97b7e1b8 CK	61	case ttm_bo_type_sg:
45a9d154	62	page_flags \|= TTM_PAGE_FLAG_SG;
97b7e1b8 CK	63	break;
	64	default:
	65	pr_err("Illegal buffer object type\n");
45a9d154	66	return -EINVAL;
97b7e1b8 CK	67	}
97b7e1b8 CK	68
dde5da23	69	bo->ttm = bdev->driver->ttm_tt_create(bo, page_flags);
45a9d154 CK	70	if (unlikely(bo->ttm == NULL))
	71	return -ENOMEM;
	72
45a9d154	73	return 0;
97b7e1b8 CK	74	}
97b7e1b8 CK	75
78616b88	76	/*
ba4e7d97	77	* Allocates storage for pointers to the pages that back the ttm.
ba4e7d97	78	*/
5b4262d7	79	static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
ba4e7d97	80	{
2098105e MH	81	ttm->pages = kvmalloc_array(ttm->num_pages, sizeof(void*),
2098105e MH	82	GFP_KERNEL \| __GFP_ZERO);
5b4262d7 TSD	83	if (!ttm->pages)
	84	return -ENOMEM;
	85	return 0;
ba4e7d97 TH	86	}
ba4e7d97 TH	87
e34b8fee	88	static int ttm_dma_tt_alloc_page_directory(struct ttm_tt *ttm)
ba4e7d97	89	{
e34b8fee CK	90	ttm->pages = kvmalloc_array(ttm->num_pages,
	91	sizeof(*ttm->pages) +
	92	sizeof(*ttm->dma_address),
	93	GFP_KERNEL \| __GFP_ZERO);
	94	if (!ttm->pages)
5b4262d7	95	return -ENOMEM;
e34b8fee CK	96
e34b8fee CK	97	ttm->dma_address = (void *)(ttm->pages + ttm->num_pages);
5b4262d7	98	return 0;
ba4e7d97 TH	99	}
ba4e7d97 TH	100
e34b8fee	101	static int ttm_sg_tt_alloc_page_directory(struct ttm_tt *ttm)
75a57669	102	{
e34b8fee	103	ttm->dma_address = kvmalloc_array(ttm->num_pages,
75a57669 CK	104	sizeof(*ttm->dma_address),
	105	GFP_KERNEL \| __GFP_ZERO);
	106	if (!ttm->dma_address)
	107	return -ENOMEM;
	108	return 0;
	109	}
	110
7626168f	111	void ttm_tt_destroy_common(struct ttm_bo_device bdev, struct ttm_tt ttm)
ba4e7d97	112	{
7eec9151	113	ttm_tt_unpopulate(bdev, ttm);
ba4e7d97	114
ab861424	115	if (ttm->swap_storage)
ba4e7d97 TH	116	fput(ttm->swap_storage);
ba4e7d97 TH	117
649bf3ca	118	ttm->swap_storage = NULL;
7626168f DA	119	}
	120	EXPORT_SYMBOL(ttm_tt_destroy_common);
	121
	122	void ttm_tt_destroy(struct ttm_bo_device bdev, struct ttm_tt ttm)
	123	{
04e89ff3	124	bdev->driver->ttm_tt_destroy(bdev, ttm);
ba4e7d97 TH	125	}
ba4e7d97 TH	126
2869e82e CK	127	static void ttm_tt_init_fields(struct ttm_tt *ttm,
2869e82e CK	128	struct ttm_buffer_object *bo,
1b4ea4c5 CK	129	uint32_t page_flags,
1b4ea4c5 CK	130	enum ttm_caching caching)
ba4e7d97	131	{
dde5da23	132	ttm->num_pages = bo->num_pages;
1b4ea4c5	133	ttm->caching = ttm_cached;
ba4e7d97	134	ttm->page_flags = page_flags;
e34b8fee	135	ttm->dma_address = NULL;
dea7e0ac	136	ttm->swap_storage = NULL;
536bbeba	137	ttm->sg = bo->sg;
1b4ea4c5	138	ttm->caching = caching;
75a57669 CK	139	}
75a57669 CK	140
dde5da23	141	int ttm_tt_init(struct ttm_tt ttm, struct ttm_buffer_object bo,
1b4ea4c5	142	uint32_t page_flags, enum ttm_caching caching)
75a57669	143	{
1b4ea4c5	144	ttm_tt_init_fields(ttm, bo, page_flags, caching);
ba4e7d97	145
5b4262d7	146	if (ttm_tt_alloc_page_directory(ttm)) {
25d0479a	147	pr_err("Failed allocating page table\n");
649bf3ca	148	return -ENOMEM;
ba4e7d97	149	}
649bf3ca	150	return 0;
ba4e7d97	151	}
649bf3ca	152	EXPORT_SYMBOL(ttm_tt_init);
ba4e7d97	153
8e7e7052 JG	154	void ttm_tt_fini(struct ttm_tt *ttm)
8e7e7052 JG	155	{
e34b8fee CK	156	if (ttm->pages)
	157	kvfree(ttm->pages);
	158	else
	159	kvfree(ttm->dma_address);
8e7e7052	160	ttm->pages = NULL;
e34b8fee	161	ttm->dma_address = NULL;
8e7e7052 JG	162	}
	163	EXPORT_SYMBOL(ttm_tt_fini);
	164
e34b8fee	165	int ttm_dma_tt_init(struct ttm_tt ttm, struct ttm_buffer_object bo,
1b4ea4c5	166	uint32_t page_flags, enum ttm_caching caching)
8e7e7052	167	{
1b4ea4c5	168	ttm_tt_init_fields(ttm, bo, page_flags, caching);
8e7e7052	169
e34b8fee	170	if (ttm_dma_tt_alloc_page_directory(ttm)) {
25d0479a	171	pr_err("Failed allocating page table\n");
8e7e7052 JG	172	return -ENOMEM;
	173	}
	174	return 0;
	175	}
	176	EXPORT_SYMBOL(ttm_dma_tt_init);
	177
e34b8fee	178	int ttm_sg_tt_init(struct ttm_tt ttm, struct ttm_buffer_object bo,
1b4ea4c5	179	uint32_t page_flags, enum ttm_caching caching)
75a57669	180	{
75a57669 CK	181	int ret;
75a57669 CK	182
1b4ea4c5	183	ttm_tt_init_fields(ttm, bo, page_flags, caching);
75a57669	184
75a57669	185	if (page_flags & TTM_PAGE_FLAG_SG)
e34b8fee	186	ret = ttm_sg_tt_alloc_page_directory(ttm);
75a57669	187	else
e34b8fee	188	ret = ttm_dma_tt_alloc_page_directory(ttm);
75a57669	189	if (ret) {
75a57669 CK	190	pr_err("Failed allocating page table\n");
	191	return -ENOMEM;
	192	}
	193	return 0;
	194	}
	195	EXPORT_SYMBOL(ttm_sg_tt_init);
	196
b1e5f172	197	int ttm_tt_swapin(struct ttm_tt *ttm)
ba4e7d97 TH	198	{
	199	struct address_space *swap_space;
	200	struct file *swap_storage;
	201	struct page *from_page;
	202	struct page *to_page;
ab861424 CK	203	gfp_t gfp_mask;
ab861424 CK	204	int i, ret;
ba4e7d97	205
ba4e7d97 TH	206	swap_storage = ttm->swap_storage;
	207	BUG_ON(swap_storage == NULL);
	208
93c76a3d	209	swap_space = swap_storage->f_mapping;
ab861424	210	gfp_mask = mapping_gfp_mask(swap_space);
ba4e7d97 TH	211
ba4e7d97 TH	212	for (i = 0; i < ttm->num_pages; ++i) {
ab861424 CK	213	from_page = shmem_read_mapping_page_gfp(swap_space, i,
ab861424 CK	214	gfp_mask);
290e5505 MM	215	if (IS_ERR(from_page)) {
290e5505 MM	216	ret = PTR_ERR(from_page);
ba4e7d97	217	goto out_err;
290e5505	218	}
b1e5f172	219	to_page = ttm->pages[i];
ab861424 CK	220	if (unlikely(to_page == NULL)) {
ab861424 CK	221	ret = -ENOMEM;
ba4e7d97	222	goto out_err;
ab861424	223	}
ba4e7d97	224
259a290e	225	copy_highpage(to_page, from_page);
09cbfeaf	226	put_page(from_page);
ba4e7d97 TH	227	}
ba4e7d97 TH	228
ab861424	229	fput(swap_storage);
ba4e7d97 TH	230	ttm->swap_storage = NULL;
	231	ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
	232
	233	return 0;
ab861424	234
ba4e7d97	235	out_err:
290e5505	236	return ret;
ba4e7d97 TH	237	}
ba4e7d97 TH	238
ab861424	239	int ttm_tt_swapout(struct ttm_bo_device bdev, struct ttm_tt ttm)
ba4e7d97 TH	240	{
	241	struct address_space *swap_space;
	242	struct file *swap_storage;
	243	struct page *from_page;
	244	struct page *to_page;
ab861424 CK	245	gfp_t gfp_mask;
	246	int i, ret;
	247
	248	swap_storage = shmem_file_setup("ttm swap",
	249	ttm->num_pages << PAGE_SHIFT,
	250	0);
	251	if (IS_ERR(swap_storage)) {
	252	pr_err("Failed allocating swap storage\n");
	253	return PTR_ERR(swap_storage);
ddde985c	254	}
ba4e7d97	255
93c76a3d	256	swap_space = swap_storage->f_mapping;
ab861424	257	gfp_mask = mapping_gfp_mask(swap_space);
ba4e7d97 TH	258
	259	for (i = 0; i < ttm->num_pages; ++i) {
	260	from_page = ttm->pages[i];
	261	if (unlikely(from_page == NULL))
	262	continue;
cb5f1a52 AG	263
cb5f1a52 AG	264	to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask);
55579cfe	265	if (IS_ERR(to_page)) {
290e5505	266	ret = PTR_ERR(to_page);
ba4e7d97	267	goto out_err;
290e5505	268	}
259a290e	269	copy_highpage(to_page, from_page);
ba4e7d97 TH	270	set_page_dirty(to_page);
ba4e7d97 TH	271	mark_page_accessed(to_page);
09cbfeaf	272	put_page(to_page);
ba4e7d97 TH	273	}
ba4e7d97 TH	274
0a667b50	275	ttm_tt_unpopulate(bdev, ttm);
ba4e7d97 TH	276	ttm->swap_storage = swap_storage;
ba4e7d97 TH	277	ttm->page_flags \|= TTM_PAGE_FLAG_SWAPPED;
ba4e7d97 TH	278
ba4e7d97 TH	279	return 0;
ab861424	280
ba4e7d97	281	out_err:
ab861424	282	fput(swap_storage);
ba4e7d97	283
290e5505	284	return ret;
ba4e7d97	285	}
58aa6622	286
0a667b50	287	static void ttm_tt_add_mapping(struct ttm_bo_device bdev, struct ttm_tt ttm)
ec929370 CK	288	{
	289	pgoff_t i;
	290
	291	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
	292	return;
	293
	294	for (i = 0; i < ttm->num_pages; ++i)
0a667b50	295	ttm->pages[i]->mapping = bdev->dev_mapping;
ec929370 CK	296	}
ec929370 CK	297
0a667b50 DA	298	int ttm_tt_populate(struct ttm_bo_device *bdev,
0a667b50 DA	299	struct ttm_tt ttm, struct ttm_operation_ctx ctx)
25893a14	300	{
ec929370 CK	301	int ret;
ec929370 CK	302
2040ec97 DA	303	if (!ttm)
	304	return -EINVAL;
	305
7eec9151	306	if (ttm_tt_is_populated(ttm))
25893a14 CK	307	return 0;
25893a14 CK	308
0a667b50 DA	309	if (bdev->driver->ttm_tt_populate)
0a667b50 DA	310	ret = bdev->driver->ttm_tt_populate(bdev, ttm, ctx);
e44fcf71	311	else
ee5d2a8e	312	ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
d1cb1f25 CK	313	if (ret)
	314	return ret;
	315
	316	ttm_tt_add_mapping(bdev, ttm);
	317	ttm->page_flags \|= TTM_PAGE_FLAG_PRIV_POPULATED;
05f8d250 CK	318	if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
	319	ret = ttm_tt_swapin(ttm);
	320	if (unlikely(ret != 0)) {
	321	ttm_tt_unpopulate(bdev, ttm);
	322	return ret;
	323	}
	324	}
	325
d1cb1f25	326	return 0;
25893a14	327	}
2040ec97	328	EXPORT_SYMBOL(ttm_tt_populate);
25893a14	329
58aa6622 TH	330	static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
	331	{
	332	pgoff_t i;
	333	struct page **page = ttm->pages;
	334
1b76af5c TH	335	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
	336	return;
	337
58aa6622 TH	338	for (i = 0; i < ttm->num_pages; ++i) {
	339	(*page)->mapping = NULL;
	340	(*page++)->index = 0;
	341	}
	342	}
	343
0a667b50 DA	344	void ttm_tt_unpopulate(struct ttm_bo_device *bdev,
0a667b50 DA	345	struct ttm_tt *ttm)
58aa6622	346	{
7eec9151	347	if (!ttm_tt_is_populated(ttm))
58aa6622 TH	348	return;
	349
	350	ttm_tt_clear_mapping(ttm);
0a667b50 DA	351	if (bdev->driver->ttm_tt_unpopulate)
0a667b50 DA	352	bdev->driver->ttm_tt_unpopulate(bdev, ttm);
e44fcf71	353	else
ee5d2a8e	354	ttm_pool_free(&bdev->pool, ttm);
d1cb1f25	355	ttm->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED;
58aa6622	356	}