/**************************************************************************
*
* 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
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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 {
unsigned fpfn;
unsigned 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
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