/* * Copyright 2020 Advanced Micro Devices, Inc. * * 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, sublicense, * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: Christian König */ #ifndef _TTM_CACHING_H_ #define _TTM_CACHING_H_ #include <linux/pgtable.h> #define TTM_NUM_CACHING_TYPES 3 /** * enum ttm_caching - CPU caching and BUS snooping behavior. */ enum ttm_caching { /** * @ttm_uncached: Most defensive option for device mappings, * don't even allow write combining. */ ttm_uncached, /** * @ttm_write_combined: Don't cache read accesses, but allow at least * writes to be combined. */ ttm_write_combined, /** * @ttm_cached: Fully cached like normal system memory, requires that * devices snoop the CPU cache on accesses. */ ttm_cached }; pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp); #endif