1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/**************************************************************************
*
* Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/*
* Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
*/
#include <linux/export.h>
#include <drm/drmP.h>
#if defined(CONFIG_X86)
#include <asm/smp.h>
/*
* clflushopt is an unordered instruction which needs fencing with mfence or
* sfence to avoid ordering issues. For drm_clflush_page this fencing happens
* in the caller.
*/
static void
drm_clflush_page(struct page *page)
{
uint8_t *page_virtual;
unsigned int i;
const int size = boot_cpu_data.x86_clflush_size;
if (unlikely(page == NULL))
return;
page_virtual = kmap_atomic(page);
for (i = 0; i < PAGE_SIZE; i += size)
clflushopt(page_virtual + i);
kunmap_atomic(page_virtual);
}
static void drm_cache_flush_clflush(struct page *pages[],
unsigned long num_pages)
{
unsigned long i;
mb();
for (i = 0; i < num_pages; i++)
drm_clflush_page(*pages++);
mb();
}
#endif
void
drm_clflush_pages(struct page *pages[], unsigned long num_pages)
{
#if defined(CONFIG_X86)
if (static_cpu_has(X86_FEATURE_CLFLUSH)) {
drm_cache_flush_clflush(pages, num_pages);
return;
}
if (wbinvd_on_all_cpus())
printk(KERN_ERR "Timed out waiting for cache flush.\n");
#elif defined(__powerpc__)
unsigned long i;
for (i = 0; i < num_pages; i++) {
struct page *page = pages[i];
void *page_virtual;
if (unlikely(page == NULL))
continue;
page_virtual = kmap_atomic(page);
flush_dcache_range((unsigned long)page_virtual,
(unsigned long)page_virtual + PAGE_SIZE);
kunmap_atomic(page_virtual);
}
#else
printk(KERN_ERR "Architecture has no drm_cache.c support\n");
WARN_ON_ONCE(1);
#endif
}
EXPORT_SYMBOL(drm_clflush_pages);
void
drm_clflush_sg(struct sg_table *st)
{
#if defined(CONFIG_X86)
if (static_cpu_has(X86_FEATURE_CLFLUSH)) {
struct sg_page_iter sg_iter;
mb();
for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
drm_clflush_page(sg_page_iter_page(&sg_iter));
mb();
return;
}
if (wbinvd_on_all_cpus())
printk(KERN_ERR "Timed out waiting for cache flush.\n");
#else
printk(KERN_ERR "Architecture has no drm_cache.c support\n");
WARN_ON_ONCE(1);
#endif
}
EXPORT_SYMBOL(drm_clflush_sg);
void
drm_clflush_virt_range(void *addr, unsigned long length)
{
#if defined(CONFIG_X86)
if (static_cpu_has(X86_FEATURE_CLFLUSH)) {
const int size = boot_cpu_data.x86_clflush_size;
void *end = addr + length;
addr = (void *)(((unsigned long)addr) & -size);
mb();
for (; addr < end; addr += size)
clflushopt(addr);
clflushopt(end - 1); /* force serialisation */
mb();
return;
}
if (wbinvd_on_all_cpus())
printk(KERN_ERR "Timed out waiting for cache flush.\n");
#else
printk(KERN_ERR "Architecture has no drm_cache.c support\n");
WARN_ON_ONCE(1);
#endif
}
EXPORT_SYMBOL(drm_clflush_virt_range);
|
