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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/**************************************************************************
*
* Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA
* All Rights Reserved.
* Copyright (c) 2009 VMware, Inc., Palo Alto, CA., 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 Hellstrom <thomas-at-tungstengraphics-dot-com>
*/
#include "ttm/ttm_pat_compat.h"
#include <linux/version.h>
#include <linux/spinlock.h>
#include <asm/pgtable.h>
#if (defined(CONFIG_X86) && !defined(CONFIG_X86_PAT))
#include <asm/tlbflush.h>
#include <asm/msr.h>
#include <asm/system.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#ifndef MSR_IA32_CR_PAT
#define MSR_IA32_CR_PAT 0x0277
#endif
#ifndef _PAGE_PAT
#define _PAGE_PAT 0x080
#endif
static int ttm_has_pat = 0;
/*
* Used at resume-time when CPU-s are fired up.
*/
static void ttm_pat_ipi_handler(void *notused)
{
u32 v1, v2;
rdmsr(MSR_IA32_CR_PAT, v1, v2);
v2 &= 0xFFFFFFF8;
v2 |= 0x00000001;
wbinvd();
wrmsr(MSR_IA32_CR_PAT, v1, v2);
wbinvd();
__flush_tlb_all();
}
static void ttm_pat_enable(void)
{
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27))
if (on_each_cpu(ttm_pat_ipi_handler, NULL, 1, 1) != 0) {
#else
if (on_each_cpu(ttm_pat_ipi_handler, NULL, 1) != 0) {
#endif
printk(KERN_ERR "Timed out setting up CPU PAT.\n");
}
}
void ttm_pat_resume(void)
{
if (unlikely(!ttm_has_pat))
return;
ttm_pat_enable();
}
static int psb_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
if (action == CPU_ONLINE) {
ttm_pat_resume();
}
return 0;
}
static struct notifier_block psb_nb = {
.notifier_call = psb_cpu_callback,
.priority = 1
};
/*
* Set i386 PAT entry PAT4 to Write-combining memory type on all processors.
*/
void ttm_pat_init(void)
{
if (likely(ttm_has_pat))
return;
if (!boot_cpu_has(X86_FEATURE_PAT)) {
return;
}
ttm_pat_enable();
if (num_present_cpus() > 1)
register_cpu_notifier(&psb_nb);
ttm_has_pat = 1;
}
void ttm_pat_takedown(void)
{
if (unlikely(!ttm_has_pat))
return;
if (num_present_cpus() > 1)
unregister_cpu_notifier(&psb_nb);
ttm_has_pat = 0;
}
pgprot_t pgprot_ttm_x86_wc(pgprot_t prot)
{
if (likely(ttm_has_pat)) {
pgprot_val(prot) |= _PAGE_PAT;
return prot;
} else {
return pgprot_noncached(prot);
}
}
#else
void ttm_pat_init(void)
{
}
void ttm_pat_takedown(void)
{
}
void ttm_pat_resume(void)
{
}
#ifdef CONFIG_X86
#include <asm/pat.h>
pgprot_t pgprot_ttm_x86_wc(pgprot_t prot)
{
uint32_t cache_bits = ((1) ? _PAGE_CACHE_WC : _PAGE_CACHE_UC_MINUS);
return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_MASK) | cache_bits);
}
#else
pgprot_t pgprot_ttm_x86_wc(pgprot_t prot)
{
BUG();
}
#endif
#endif
|
