PNP0A06
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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.
 *
 **************************************************************************/
#ifndef _TTM_TT_H_
#define _TTM_TT_H_

#include <linux/pagemap.h>
#include <linux/types.h>
#include <drm/ttm/ttm_caching.h>
#include <drm/ttm/ttm_kmap_iter.h>

struct ttm_backup;
struct ttm_device;
struct ttm_tt;
struct ttm_resource;
struct ttm_buffer_object;
struct ttm_operation_ctx;
struct ttm_pool_tt_restore;

/**
 * struct ttm_tt - This is a structure holding the pages, caching- and aperture
 * binding status for a buffer object that isn't backed by fixed (VRAM / AGP)
 * memory.
 */
struct ttm_tt {
	/** @pages: Array of pages backing the data. */
	struct page **pages;
	/**
	 * @page_flags: The page flags.
	 *
	 * Supported values:
	 *
	 * TTM_TT_FLAG_SWAPPED: Set by TTM when the pages have been unpopulated
	 * and swapped out by TTM.  Calling ttm_tt_populate() will then swap the
	 * pages back in, and unset the flag. Drivers should in general never
	 * need to touch this.
	 *
	 * TTM_TT_FLAG_ZERO_ALLOC: Set if the pages will be zeroed on
	 * allocation.
	 *
	 * TTM_TT_FLAG_EXTERNAL: Set if the underlying pages were allocated
	 * externally, like with dma-buf or userptr. This effectively disables
	 * TTM swapping out such pages.  Also important is to prevent TTM from
	 * ever directly mapping these pages.
	 *
	 * Note that enum ttm_bo_type.ttm_bo_type_sg objects will always enable
	 * this flag.
	 *
	 * TTM_TT_FLAG_EXTERNAL_MAPPABLE: Same behaviour as
	 * TTM_TT_FLAG_EXTERNAL, but with the reduced restriction that it is
	 * still valid to use TTM to map the pages directly. This is useful when
	 * implementing a ttm_tt backend which still allocates driver owned
	 * pages underneath(say with shmem).
	 *
	 * Note that since this also implies TTM_TT_FLAG_EXTERNAL, the usage
	 * here should always be:
	 *
	 *   page_flags = TTM_TT_FLAG_EXTERNAL |
	 *		  TTM_TT_FLAG_EXTERNAL_MAPPABLE;
	 *
	 * TTM_TT_FLAG_DECRYPTED: The mapped ttm pages should be marked as
	 * not encrypted. The framework will try to match what the dma layer
	 * is doing, but note that it is a little fragile because ttm page
	 * fault handling abuses the DMA api a bit and dma_map_attrs can't be
	 * used to assure pgprot always matches.
	 *
	 * TTM_TT_FLAG_BACKED_UP: TTM internal only. This is set if the
	 * struct ttm_tt has been (possibly partially) backed up.
	 *
	 * TTM_TT_FLAG_PRIV_POPULATED: TTM internal only. DO NOT USE. This is
	 * set by TTM after ttm_tt_populate() has successfully returned, and is
	 * then unset when TTM calls ttm_tt_unpopulate().
	 *
	 */
#define TTM_TT_FLAG_SWAPPED		BIT(0)
#define TTM_TT_FLAG_ZERO_ALLOC		BIT(1)
#define TTM_TT_FLAG_EXTERNAL		BIT(2)
#define TTM_TT_FLAG_EXTERNAL_MAPPABLE	BIT(3)
#define TTM_TT_FLAG_D