1 | /* SPDX-License-Identifier: GPL-2.0 OR MIT */ |
2 | /************************************************************************** |
3 | * |
4 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA |
5 | * All Rights Reserved. |
6 | * |
7 | * Permission is hereby granted, free of charge, to any person obtaining a |
8 | * copy of this software and associated documentation files (the |
9 | * "Software"), to deal in the Software without restriction, including |
10 | * without limitation the rights to use, copy, modify, merge, publish, |
11 | * distribute, sub license, and/or sell copies of the Software, and to |
12 | * permit persons to whom the Software is furnished to do so, subject to |
13 | * the following conditions: |
14 | * |
15 | * The above copyright notice and this permission notice (including the |
16 | * next paragraph) shall be included in all copies or substantial portions |
17 | * of the Software. |
18 | * |
19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
20 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
21 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
22 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
23 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
24 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
25 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
26 | * |
27 | **************************************************************************/ |
28 | /* |
29 | * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> |
30 | * Jerome Glisse |
31 | */ |
32 | #include <linux/module.h> |
33 | #include <linux/device.h> |
34 | #include <linux/pgtable.h> |
35 | #include <linux/sched.h> |
36 | #include <linux/debugfs.h> |
37 | #include <drm/drm_sysfs.h> |
38 | #include <drm/ttm/ttm_caching.h> |
39 | |
40 | #include "ttm_module.h" |
41 | |
42 | /** |
43 | * DOC: TTM |
44 | * |
45 | * TTM is a memory manager for accelerator devices with dedicated memory. |
46 | * |
47 | * The basic idea is that resources are grouped together in buffer objects of |
48 | * certain size and TTM handles lifetime, movement and CPU mappings of those |
49 | * objects. |
50 | * |
51 | * TODO: Add more design background and information here. |
52 | */ |
53 | |
54 | /** |
55 | * ttm_prot_from_caching - Modify the page protection according to the |
56 | * ttm cacing mode |
57 | * @caching: The ttm caching mode |
58 | * @tmp: The original page protection |
59 | * |
60 | * Return: The modified page protection |
61 | */ |
62 | pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp) |
63 | { |
64 | /* Cached mappings need no adjustment */ |
65 | if (caching == ttm_cached) |
66 | return tmp; |
67 | |
68 | #if defined(__i386__) || defined(__x86_64__) |
69 | if (caching == ttm_write_combined) |
70 | tmp = pgprot_writecombine(prot: tmp); |
71 | #ifndef CONFIG_UML |
72 | else if (boot_cpu_data.x86 > 3) |
73 | tmp = pgprot_noncached(tmp); |
74 | #endif /* CONFIG_UML */ |
75 | #endif /* __i386__ || __x86_64__ */ |
76 | #if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \ |
77 | defined(__powerpc__) || defined(__mips__) || defined(__loongarch__) |
78 | if (caching == ttm_write_combined) |
79 | tmp = pgprot_writecombine(tmp); |
80 | else |
81 | tmp = pgprot_noncached(tmp); |
82 | #endif |
83 | #if defined(__sparc__) |
84 | tmp = pgprot_noncached(tmp); |
85 | #endif |
86 | return tmp; |
87 | } |
88 | |
89 | MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse" ); |
90 | MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)" ); |
91 | MODULE_LICENSE("GPL and additional rights" ); |
92 | |