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
|
/*
* vSMPowered(tm) systems specific initialization
* Copyright (C) 2005 ScaleMP Inc.
*
* Use of this code is subject to the terms and conditions of the
* GNU general public license version 2. See "COPYING" or
* http://www.gnu.org/licenses/gpl.html
*
* Ravikiran Thirumalai <kiran@scalemp.com>,
* Shai Fultheim <shai@scalemp.com>
* Paravirt ops integration: Glauber de Oliveira Costa <gcosta@redhat.com>,
* Ravikiran Thirumalai <kiran@scalemp.com>
*/
#include <linux/init.h>
#include <linux/pci_ids.h>
#include <linux/pci_regs.h>
#include <asm/apic.h>
#include <asm/pci-direct.h>
#include <asm/io.h>
#include <asm/paravirt.h>
#include <asm/setup.h>
#if defined CONFIG_PCI && defined CONFIG_PARAVIRT
/*
* Interrupt control on vSMPowered systems:
* ~AC is a shadow of IF. If IF is 'on' AC should be 'off'
* and vice versa.
*/
static unsigned long vsmp_save_fl(void)
{
unsigned long flags = native_save_fl();
if (!(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC))
flags &= ~X86_EFLAGS_IF;
return flags;
}
static void vsmp_restore_fl(unsigned long flags)
{
if (flags & X86_EFLAGS_IF)
flags &= ~X86_EFLAGS_AC;
else
flags |= X86_EFLAGS_AC;
native_restore_fl(flags);
}
static void vsmp_irq_disable(void)
{
unsigned long flags = native_save_fl();
native_restore_fl((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);
}
static void vsmp_irq_enable(void)
{
unsigned long flags = native_save_fl();
native_restore_fl((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
}
static unsigned __init vsmp_patch(u8 type, u16 clobbers, void *ibuf,
unsigned long addr, unsigned len)
{
switch (type) {
case PARAVIRT_PATCH(pv_irq_ops.irq_enable):
case PARAVIRT_PATCH(pv_irq_ops.irq_disable):
case PARAVIRT_PATCH(pv_irq_ops.save_fl):
case PARAVIRT_PATCH(pv_irq_ops.restore_fl):
return paravirt_patch_default(type, clobbers, ibuf, addr, len);
default:
return native_patch(type, clobbers, ibuf, addr, len);
}
}
static void __init set_vsmp_pv_ops(void)
{
void *address;
unsigned int cap, ctl, cfg;
/* set vSMP magic bits to indicate vSMP capable kernel */
cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
address = early_ioremap(cfg, 8);
cap = readl(address);
ctl = readl(address + 4);
printk(KERN_INFO "vSMP CTL: capabilities:0x%08x control:0x%08x\n",
cap, ctl);
if (cap & ctl & (1 << 4)) {
/* Setup irq ops and turn on vSMP IRQ fastpath handling */
pv_irq_ops.irq_disable = vsmp_irq_disable;
pv_irq_ops.irq_enable = vsmp_irq_enable;
pv_irq_ops.save_fl = vsmp_save_fl;
pv_irq_ops.restore_fl = vsmp_restore_fl;
pv_init_ops.patch = vsmp_patch;
ctl &= ~(1 << 4);
writel(ctl, address + 4);
ctl = readl(address + 4);
printk(KERN_INFO "vSMP CTL: control set to:0x%08x\n", ctl);
}
early_iounmap(address, 8);
}
#else
static void __init set_vsmp_pv_ops(void)
{
}
#endif
#ifdef CONFIG_PCI
static int is_vsmp = -1;
static void __init detect_vsmp_box(void)
{
is_vsmp = 0;
if (!early_pci_allowed())
return;
/* Check if we are running on a ScaleMP vSMPowered box */
if (read_pci_config(0, 0x1f, 0, PCI_VENDOR_ID) ==
(PCI_VENDOR_ID_SCALEMP | (PCI_DEVICE_ID_SCALEMP_VSMP_CTL << 16)))
is_vsmp = 1;
}
int is_vsmp_box(void)
{
if (is_vsmp != -1)
return is_vsmp;
else {
WARN_ON_ONCE(1);
return 0;
}
}
#else
static void __init detect_vsmp_box(void)
{
}
int is_vsmp_box(void)
{
return 0;
}
#endif
void __init vsmp_init(void)
{
detect_vsmp_box();
if (!is_vsmp_box())
return;
set_vsmp_pv_ops();
return;
}
|
