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1/*2 * Copyright 2020 Advanced Micro Devices, Inc.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 * Authors: Christian König23 */24 25#ifndef _TTM_CACHING_H_26#define _TTM_CACHING_H_27 28#include <linux/pgtable.h>29 30#define TTM_NUM_CACHING_TYPES 331 32/**33 * enum ttm_caching - CPU caching and BUS snooping behavior.34 */35enum ttm_caching {36 /**37 * @ttm_uncached: Most defensive option for device mappings,38 * don't even allow write combining.39 */40 ttm_uncached,41 42 /**43 * @ttm_write_combined: Don't cache read accesses, but allow at least44 * writes to be combined.45 */46 ttm_write_combined,47 48 /**49 * @ttm_cached: Fully cached like normal system memory, requires that50 * devices snoop the CPU cache on accesses.51 */52 ttm_cached53};54 55pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp);56 57#endif58