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1 | /************************************************************************** |
2 | * | |
3 | * Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA | |
4 | * All Rights Reserved. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a | |
7 | * copy of this software and associated documentation files (the | |
8 | * "Software"), to deal in the Software without restriction, including | |
9 | * without limitation the rights to use, copy, modify, merge, publish, | |
10 | * distribute, sub license, and/or sell copies of the Software, and to | |
11 | * permit persons to whom the Software is furnished to do so, subject to | |
12 | * the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial portions | |
16 | * of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
25 | * | |
26 | **************************************************************************/ | |
27 | /* | |
28 | * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com> | |
29 | */ | |
30 | ||
31 | #include "drmP.h" | |
32 | ||
33 | #if defined(CONFIG_X86) | |
34 | static void | |
35 | drm_clflush_page(struct page *page) | |
36 | { | |
37 | uint8_t *page_virtual; | |
38 | unsigned int i; | |
39 | ||
40 | if (unlikely(page == NULL)) | |
41 | return; | |
42 | ||
43 | page_virtual = kmap_atomic(page, KM_USER0); | |
44 | for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size) | |
45 | clflush(page_virtual + i); | |
46 | kunmap_atomic(page_virtual, KM_USER0); | |
47 | } | |
48 | #endif | |
49 | ||
673a394b EA |
50 | void |
51 | drm_clflush_pages(struct page *pages[], unsigned long num_pages) | |
52 | { | |
53 | ||
54 | #if defined(CONFIG_X86) | |
55 | if (cpu_has_clflush) { | |
56 | unsigned long i; | |
57 | ||
58 | mb(); | |
59 | for (i = 0; i < num_pages; ++i) | |
60 | drm_clflush_page(*pages++); | |
61 | mb(); | |
62 | ||
63 | return; | |
64 | } | |
673a394b | 65 | |
e0f0754f DA |
66 | wbinvd(); |
67 | #endif | |
673a394b EA |
68 | } |
69 | EXPORT_SYMBOL(drm_clflush_pages); |