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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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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.
*/
#define TTM_PL_SYSTEM 0
#define TTM_PL_TT 1
#define TTM_PL_VRAM 2
#define TTM_PL_PRIV 3
#define TTM_PL_FLAG_SYSTEM (1 << TTM_PL_SYSTEM)
#define TTM_PL_FLAG_TT (1 << TTM_PL_TT)
#define TTM_PL_FLAG_VRAM (1 << TTM_PL_VRAM)
#define TTM_PL_FLAG_PRIV (1 << TTM_PL_PRIV)
#define TTM_PL_MASK_MEM 0x0000FFFF
/*
* Other flags that affects data placement.
* TTM_PL_FLAG_CACHED indicates cache-coherent mappings
* if available.
* TTM_PL_FLAG_SHARED means that another application may
* reference the buffer.
* TTM_PL_FLAG_NO_EVICT means that the buffer may never
* be evicted to make room for other buffers.
* TTM_PL_FLAG_TOPDOWN requests to be placed from the
* top of the memory area, instead of the bottom.
*/
#define TTM_PL_FLAG_CACHED (1 << 16)
#define TTM_PL_FLAG_UNCACHED (1 << 17)
#define TTM_PL_FLAG_WC (1 << 18)
#define TTM_PL_FLAG_CONTIGUOUS (1 << 19)
#define TTM_PL_FLAG_NO_EVICT (1 << 21)
#define TTM_PL_FLAG_TOPDOWN (1 << 22)
#define TTM_PL_MASK_CACHING (TTM_PL_FLAG_CACHED | \
TTM_PL_FLAG_UNCACHED | \
TTM_PL_FLAG_WC)
#define TTM_PL_MASK_MEMTYPE (TTM_PL_MASK_MEM | TTM_PL_MASK_CACHING)
/**
* struct ttm_place
*
* @fpfn: first valid page frame number to put the object
* @lpfn: last valid page frame number to put the object
* @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 flags;
};
/**
* struct ttm_placement
*
* @num_placement: number of preferred placements
* @placement: preferred placements
* @num_busy_placement: number of preferred placements when need to evict buffer
* @busy_placement: preferred placements when need to evict buffer
*
* Structure indicating the placement you request for an object.
*/
struct ttm_placement {
unsigned num_placement;
const struct ttm_place *placement;
unsigned num_busy_placement;
const struct ttm_place *busy_placement;
};
#endif
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