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