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/**************************************************************************

 *

 * 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 

 */

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

#include 

#include 

//#include 

//#include 

#include 

//#include 

//#include 

#include 

#include 

//#include 

#include 

#include 

#include 

#include 

#include 

/**

 * 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->swap_storage = NULL;

	ttm_tt_alloc_page_directory(ttm);

	if (!ttm->pages) {

		ttm_tt_destroy(ttm);

        printf("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);

        printf("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;

	}

}

#if 0

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);

#endif

/*

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->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;

}

*/