include/drm/ttm/ttm_placement.h

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 *
 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
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/*
 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
 */

#ifndef _TTM_PLACEMENT_H_
#define _TTM_PLACEMENT_H_

#include <linux/types.h>

/*
 * Memory regions for data placement.
 *
 * Buffers placed in TTM_PL_SYSTEM are considered under TTMs control and can
 * be swapped out whenever TTMs thinks it is a good idea.
 * In cases where drivers would like to use TTM_PL_SYSTEM as a valid
 * placement they need to be able to handle the issues that arise due to the
 * above manually.
 *
 * For BO's which reside in system memory but for which the accelerator
 * requires direct access (i.e. their usage needs to be synchronized
 * between the CPU and accelerator via fences) a new, driver private
 * placement that can handle such scenarios is a good idea.
 */

#define TTM_PL_SYSTEM           0
#define TTM_PL_TT               1
#define TTM_PL_VRAM             2
#define TTM_PL_PRIV             3

/*
 * TTM_PL_FLAG_TOPDOWN requests to be placed from the
 * top of the memory area, instead of the bottom.
 */

#define TTM_PL_FLAG_CONTIGUOUS  (1 << 0)
#define TTM_PL_FLAG_TOPDOWN     (1 << 1)

/* For multihop handling */
#define TTM_PL_FLAG_TEMPORARY   (1 << 2)

/* Placement is never used during eviction */
#define TTM_PL_FLAG_DESIRED	(1 << 3)

/* Placement is only used during eviction */
#define TTM_PL_FLAG_FALLBACK	(1 << 4)

/**
 * struct ttm_place
 *
 * @fpfn:	first valid page frame number to put the object
 * @lpfn:	last valid page frame number to put the object
 * @mem_type:	One of TTM_PL_* where the resource should be allocated from.
 * @flags:	memory domain and caching flags for the object
 *
 * Structure indicating a possible place to put an object.
 */
struct ttm_place {
	uint64_t	fpfn;
	uint64_t	lpfn;
	uint32_t	mem_type;
	uint32_t	flags;
};

/**
 * struct ttm_placement
 *
 * @num_placement:	number of preferred placements
 * @placement:		preferred placements
 *
 * Structure indicating the placement you request for an object.
 */
struct ttm_placement {
	unsigned		num_placement;
	const struct ttm_place	*placement;
};

#endif