1 /* 1 /*
2 * Copyright 2020 Advanced Micro Devices, Inc. 2 * Copyright 2020 Advanced Micro Devices, Inc.
3 * 3 *
4 * Permission is hereby granted, free of charg 4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated docume 5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction 6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, pub 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to 8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to 9 * Software is furnished to do so, subject to the following conditions:
10 * 10 *
11 * The above copyright notice and this permiss 11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the S 12 * all copies or substantial portions of the Software.
13 * 13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT W 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE W 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINF 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIA 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CO 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE. 20 * OTHER DEALINGS IN THE SOFTWARE.
21 * 21 *
22 * Authors: Christian König 22 * Authors: Christian König
23 */ 23 */
24 24
25 #ifndef _TTM_CACHING_H_ 25 #ifndef _TTM_CACHING_H_
26 #define _TTM_CACHING_H_ 26 #define _TTM_CACHING_H_
27 27
28 #include <linux/pgtable.h> 28 #include <linux/pgtable.h>
29 29
30 #define TTM_NUM_CACHING_TYPES 3 30 #define TTM_NUM_CACHING_TYPES 3
31 31
32 /** 32 /**
33 * enum ttm_caching - CPU caching and BUS snoo 33 * enum ttm_caching - CPU caching and BUS snooping behavior.
34 */ 34 */
35 enum ttm_caching { 35 enum ttm_caching {
36 /** 36 /**
37 * @ttm_uncached: Most defensive optio 37 * @ttm_uncached: Most defensive option for device mappings,
38 * don't even allow write combining. 38 * don't even allow write combining.
39 */ 39 */
40 ttm_uncached, 40 ttm_uncached,
41 41
42 /** 42 /**
43 * @ttm_write_combined: Don't cache re 43 * @ttm_write_combined: Don't cache read accesses, but allow at least
44 * writes to be combined. 44 * writes to be combined.
45 */ 45 */
46 ttm_write_combined, 46 ttm_write_combined,
47 47
48 /** 48 /**
49 * @ttm_cached: Fully cached like norm 49 * @ttm_cached: Fully cached like normal system memory, requires that
50 * devices snoop the CPU cache on acce 50 * devices snoop the CPU cache on accesses.
51 */ 51 */
52 ttm_cached 52 ttm_cached
53 }; 53 };
54 54
55 pgprot_t ttm_prot_from_caching(enum ttm_cachin 55 pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp);
56 56
57 #endif 57 #endif
58 58
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