109 строки
3.6 KiB
C
109 строки
3.6 KiB
C
/**************************************************************************
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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*/
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#ifndef _TTM_PLACEMENT_H_
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#define _TTM_PLACEMENT_H_
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#include <linux/types.h>
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/*
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* Memory regions for data placement.
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*/
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#define TTM_PL_SYSTEM 0
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#define TTM_PL_TT 1
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#define TTM_PL_VRAM 2
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#define TTM_PL_PRIV 3
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#define TTM_PL_FLAG_SYSTEM (1 << TTM_PL_SYSTEM)
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#define TTM_PL_FLAG_TT (1 << TTM_PL_TT)
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#define TTM_PL_FLAG_VRAM (1 << TTM_PL_VRAM)
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#define TTM_PL_FLAG_PRIV (1 << TTM_PL_PRIV)
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#define TTM_PL_MASK_MEM 0x0000FFFF
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/*
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* Other flags that affects data placement.
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* TTM_PL_FLAG_CACHED indicates cache-coherent mappings
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* if available.
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* TTM_PL_FLAG_SHARED means that another application may
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* reference the buffer.
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* TTM_PL_FLAG_NO_EVICT means that the buffer may never
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* be evicted to make room for other buffers.
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* TTM_PL_FLAG_TOPDOWN requests to be placed from the
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* top of the memory area, instead of the bottom.
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*/
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#define TTM_PL_FLAG_CACHED (1 << 16)
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#define TTM_PL_FLAG_UNCACHED (1 << 17)
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#define TTM_PL_FLAG_WC (1 << 18)
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#define TTM_PL_FLAG_CONTIGUOUS (1 << 19)
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#define TTM_PL_FLAG_NO_EVICT (1 << 21)
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#define TTM_PL_FLAG_TOPDOWN (1 << 22)
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#define TTM_PL_MASK_CACHING (TTM_PL_FLAG_CACHED | \
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TTM_PL_FLAG_UNCACHED | \
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TTM_PL_FLAG_WC)
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#define TTM_PL_MASK_MEMTYPE (TTM_PL_MASK_MEM | TTM_PL_MASK_CACHING)
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/**
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* struct ttm_place
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*
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* @fpfn: first valid page frame number to put the object
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* @lpfn: last valid page frame number to put the object
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* @flags: memory domain and caching flags for the object
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*
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* Structure indicating a possible place to put an object.
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*/
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struct ttm_place {
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unsigned fpfn;
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unsigned lpfn;
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uint32_t flags;
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};
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/**
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* struct ttm_placement
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*
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* @num_placement: number of preferred placements
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* @placement: preferred placements
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* @num_busy_placement: number of preferred placements when need to evict buffer
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* @busy_placement: preferred placements when need to evict buffer
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*
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* Structure indicating the placement you request for an object.
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*/
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struct ttm_placement {
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unsigned num_placement;
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const struct ttm_place *placement;
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unsigned num_busy_placement;
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const struct ttm_place *busy_placement;
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};
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#endif
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