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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 | ||
2d1a8a48 | 31 | #include <linux/export.h> |
673a394b EA |
32 | #include "drmP.h" |
33 | ||
34 | #if defined(CONFIG_X86) | |
35 | static void | |
36 | drm_clflush_page(struct page *page) | |
37 | { | |
38 | uint8_t *page_virtual; | |
39 | unsigned int i; | |
40 | ||
41 | if (unlikely(page == NULL)) | |
42 | return; | |
43 | ||
44 | page_virtual = kmap_atomic(page, KM_USER0); | |
45 | for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size) | |
46 | clflush(page_virtual + i); | |
47 | kunmap_atomic(page_virtual, KM_USER0); | |
48 | } | |
673a394b | 49 | |
c9c97b8c DA |
50 | static void drm_cache_flush_clflush(struct page *pages[], |
51 | unsigned long num_pages) | |
52 | { | |
53 | unsigned long i; | |
54 | ||
55 | mb(); | |
56 | for (i = 0; i < num_pages; i++) | |
57 | drm_clflush_page(*pages++); | |
58 | mb(); | |
59 | } | |
60 | ||
61 | static void | |
62 | drm_clflush_ipi_handler(void *null) | |
63 | { | |
64 | wbinvd(); | |
65 | } | |
c9c97b8c | 66 | #endif |
ed017d9f | 67 | |
673a394b EA |
68 | void |
69 | drm_clflush_pages(struct page *pages[], unsigned long num_pages) | |
70 | { | |
71 | ||
72 | #if defined(CONFIG_X86) | |
73 | if (cpu_has_clflush) { | |
c9c97b8c | 74 | drm_cache_flush_clflush(pages, num_pages); |
673a394b EA |
75 | return; |
76 | } | |
673a394b | 77 | |
c9c97b8c DA |
78 | if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) |
79 | printk(KERN_ERR "Timed out waiting for cache flush.\n"); | |
80 | ||
81 | #elif defined(__powerpc__) | |
82 | unsigned long i; | |
83 | for (i = 0; i < num_pages; i++) { | |
84 | struct page *page = pages[i]; | |
85 | void *page_virtual; | |
86 | ||
87 | if (unlikely(page == NULL)) | |
88 | continue; | |
89 | ||
90 | page_virtual = kmap_atomic(page, KM_USER0); | |
91 | flush_dcache_range((unsigned long)page_virtual, | |
92 | (unsigned long)page_virtual + PAGE_SIZE); | |
93 | kunmap_atomic(page_virtual, KM_USER0); | |
94 | } | |
95 | #else | |
ed017d9f DA |
96 | printk(KERN_ERR "Architecture has no drm_cache.c support\n"); |
97 | WARN_ON_ONCE(1); | |
e0f0754f | 98 | #endif |
673a394b EA |
99 | } |
100 | EXPORT_SYMBOL(drm_clflush_pages); |