58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/*
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* Copyright 2020 Advanced Micro Devices, Inc.
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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 "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions 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 NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Christian König
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*/
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#ifndef _TTM_CACHING_H_
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#define _TTM_CACHING_H_
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#include <linux/pgtable.h>
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#define TTM_NUM_CACHING_TYPES 3
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/**
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* enum ttm_caching - CPU caching and BUS snooping behavior.
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*/
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enum ttm_caching {
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/**
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* @ttm_uncached: Most defensive option for device mappings,
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* don't even allow write combining.
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*/
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ttm_uncached,
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/**
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* @ttm_write_combined: Don't cache read accesses, but allow at least
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* writes to be combined.
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*/
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ttm_write_combined,
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/**
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* @ttm_cached: Fully cached like normal system memory, requires that
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* devices snoop the CPU cache on accesses.
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*/
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ttm_cached
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};
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pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp);
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#endif
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