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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> |
760285e7 | 32 | #include <drm/drmP.h> |
673a394b EA |
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; | |
87229ad9 | 40 | const int size = boot_cpu_data.x86_clflush_size; |
673a394b EA |
41 | |
42 | if (unlikely(page == NULL)) | |
43 | return; | |
44 | ||
1c9c20f6 | 45 | page_virtual = kmap_atomic(page); |
87229ad9 | 46 | for (i = 0; i < PAGE_SIZE; i += size) |
673a394b | 47 | clflush(page_virtual + i); |
1c9c20f6 | 48 | kunmap_atomic(page_virtual); |
673a394b | 49 | } |
673a394b | 50 | |
c9c97b8c DA |
51 | static void drm_cache_flush_clflush(struct page *pages[], |
52 | unsigned long num_pages) | |
53 | { | |
54 | unsigned long i; | |
55 | ||
56 | mb(); | |
57 | for (i = 0; i < num_pages; i++) | |
58 | drm_clflush_page(*pages++); | |
59 | mb(); | |
60 | } | |
61 | ||
62 | static void | |
63 | drm_clflush_ipi_handler(void *null) | |
64 | { | |
65 | wbinvd(); | |
66 | } | |
c9c97b8c | 67 | #endif |
ed017d9f | 68 | |
673a394b EA |
69 | void |
70 | drm_clflush_pages(struct page *pages[], unsigned long num_pages) | |
71 | { | |
72 | ||
73 | #if defined(CONFIG_X86) | |
74 | if (cpu_has_clflush) { | |
c9c97b8c | 75 | drm_cache_flush_clflush(pages, num_pages); |
673a394b EA |
76 | return; |
77 | } | |
673a394b | 78 | |
c9c97b8c DA |
79 | if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) |
80 | printk(KERN_ERR "Timed out waiting for cache flush.\n"); | |
81 | ||
82 | #elif defined(__powerpc__) | |
83 | unsigned long i; | |
84 | for (i = 0; i < num_pages; i++) { | |
85 | struct page *page = pages[i]; | |
86 | void *page_virtual; | |
87 | ||
88 | if (unlikely(page == NULL)) | |
89 | continue; | |
90 | ||
1c9c20f6 | 91 | page_virtual = kmap_atomic(page); |
c9c97b8c DA |
92 | flush_dcache_range((unsigned long)page_virtual, |
93 | (unsigned long)page_virtual + PAGE_SIZE); | |
1c9c20f6 | 94 | kunmap_atomic(page_virtual); |
c9c97b8c DA |
95 | } |
96 | #else | |
ed017d9f DA |
97 | printk(KERN_ERR "Architecture has no drm_cache.c support\n"); |
98 | WARN_ON_ONCE(1); | |
e0f0754f | 99 | #endif |
673a394b EA |
100 | } |
101 | EXPORT_SYMBOL(drm_clflush_pages); | |
6d5cd9cb | 102 | |
9da3da66 CW |
103 | void |
104 | drm_clflush_sg(struct sg_table *st) | |
105 | { | |
106 | #if defined(CONFIG_X86) | |
107 | if (cpu_has_clflush) { | |
f5ddf697 | 108 | struct sg_page_iter sg_iter; |
9da3da66 CW |
109 | |
110 | mb(); | |
f5ddf697 ID |
111 | for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) |
112 | drm_clflush_page(sg_iter.page); | |
9da3da66 CW |
113 | mb(); |
114 | ||
115 | return; | |
116 | } | |
117 | ||
118 | if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) | |
119 | printk(KERN_ERR "Timed out waiting for cache flush.\n"); | |
120 | #else | |
121 | printk(KERN_ERR "Architecture has no drm_cache.c support\n"); | |
122 | WARN_ON_ONCE(1); | |
123 | #endif | |
124 | } | |
125 | EXPORT_SYMBOL(drm_clflush_sg); | |
126 | ||
6d5cd9cb DV |
127 | void |
128 | drm_clflush_virt_range(char *addr, unsigned long length) | |
129 | { | |
130 | #if defined(CONFIG_X86) | |
131 | if (cpu_has_clflush) { | |
132 | char *end = addr + length; | |
133 | mb(); | |
134 | for (; addr < end; addr += boot_cpu_data.x86_clflush_size) | |
135 | clflush(addr); | |
136 | clflush(end - 1); | |
137 | mb(); | |
138 | return; | |
139 | } | |
140 | ||
141 | if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0) | |
142 | printk(KERN_ERR "Timed out waiting for cache flush.\n"); | |
143 | #else | |
144 | printk(KERN_ERR "Architecture has no drm_cache.c support\n"); | |
145 | WARN_ON_ONCE(1); | |
146 | #endif | |
147 | } | |
148 | EXPORT_SYMBOL(drm_clflush_virt_range); |