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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/init.h>
#include <asm/x86_init.h>
#include <asm/apic.h>
#include <asm/xen/hypercall.h>
#include <xen/xen.h>
#include <xen/interface/physdev.h>
#include "xen-ops.h"
#include "pmu.h"
#include "smp.h"
static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
{
struct physdev_apic apic_op;
int ret;
apic_op.apic_physbase = mpc_ioapic_addr(apic);
apic_op.reg = reg;
ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
if (!ret)
return apic_op.value;
/* fallback to return an emulated IO_APIC values */
if (reg == 0x1)
return 0x00170020;
else if (reg == 0x0)
return apic << 24;
return 0xfd;
}
static unsigned long xen_set_apic_id(unsigned int x)
{
WARN_ON(1);
return x;
}
static unsigned int xen_get_apic_id(unsigned long x)
{
return ((x)>>24) & 0xFFu;
}
static u32 xen_apic_read(u32 reg)
{
struct xen_platform_op op = {
.cmd = XENPF_get_cpuinfo,
.interface_version = XENPF_INTERFACE_VERSION,
.u.pcpu_info.xen_cpuid = 0,
};
int ret = 0;
/* Shouldn't need this as APIC is turned off for PV, and we only
* get called on the bootup processor. But just in case. */
if (!xen_initial_domain() || smp_processor_id())
return 0;
if (reg == APIC_LVR)
return 0x10;
#ifdef CONFIG_X86_32
if (reg == APIC_LDR)
return SET_APIC_LOGICAL_ID(1UL << smp_processor_id());
#endif
if (reg != APIC_ID)
return 0;
ret = HYPERVISOR_platform_op(&op);
if (ret)
op.u.pcpu_info.apic_id = BAD_APICID;
return op.u.pcpu_info.apic_id << 24;
}
static void xen_apic_write(u32 reg, u32 val)
{
if (reg == APIC_LVTPC) {
(void)pmu_apic_update(reg);
return;
}
/* Warn to see if there's any stray references */
WARN(1,"register: %x, value: %x\n", reg, val);
}
static u64 xen_apic_icr_read(void)
{
return 0;
}
static void xen_apic_icr_write(u32 low, u32 id)
{
/* Warn to see if there's any stray references */
WARN_ON(1);
}
static u32 xen_safe_apic_wait_icr_idle(void)
{
return 0;
}
static int xen_apic_probe_pv(void)
{
if (xen_pv_domain())
return 1;
return 0;
}
static int xen_madt_oem_check(char *oem_id, char *oem_table_id)
{
return xen_pv_domain();
}
static int xen_id_always_valid(int apicid)
{
return 1;
}
static int xen_id_always_registered(void)
{
return 1;
}
static int xen_phys_pkg_id(int initial_apic_id, int index_msb)
{
return initial_apic_id >> index_msb;
}
#ifdef CONFIG_X86_32
static int xen_x86_32_early_logical_apicid(int cpu)
{
/* Match with APIC_LDR read. Otherwise setup_local_APIC complains. */
return 1 << cpu;
}
#endif
static void xen_noop(void)
{
}
static void xen_silent_inquire(int apicid)
{
}
static int xen_cpu_present_to_apicid(int cpu)
{
if (cpu_present(cpu))
return cpu_data(cpu).apicid;
else
return BAD_APICID;
}
static struct apic xen_pv_apic = {
.name = "Xen PV",
.probe = xen_apic_probe_pv,
.acpi_madt_oem_check = xen_madt_oem_check,
.apic_id_valid = xen_id_always_valid,
.apic_id_registered = xen_id_always_registered,
/* .irq_delivery_mode - used in native_compose_msi_msg only */
/* .irq_dest_mode - used in native_compose_msi_msg only */
.target_cpus = default_target_cpus,
.disable_esr = 0,
/* .dest_logical - default_send_IPI_ use it but we use our own. */
.check_apicid_used = default_check_apicid_used, /* Used on 32-bit */
.vector_allocation_domain = flat_vector_allocation_domain,
.init_apic_ldr = xen_noop, /* setup_local_APIC calls it */
.ioapic_phys_id_map = default_ioapic_phys_id_map, /* Used on 32-bit */
.setup_apic_routing = NULL,
.cpu_present_to_apicid = xen_cpu_present_to_apicid,
.apicid_to_cpu_present = physid_set_mask_of_physid, /* Used on 32-bit */
.check_phys_apicid_present = default_check_phys_apicid_present, /* smp_sanity_check needs it */
.phys_pkg_id = xen_phys_pkg_id, /* detect_ht */
.get_apic_id = xen_get_apic_id,
.set_apic_id = xen_set_apic_id, /* Can be NULL on 32-bit. */
.cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
#ifdef CONFIG_SMP
.send_IPI_mask = xen_send_IPI_mask,
.send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself,
.send_IPI_allbutself = xen_send_IPI_allbutself,
.send_IPI_all = xen_send_IPI_all,
.send_IPI_self = xen_send_IPI_self,
#endif
/* .wait_for_init_deassert- used by AP bootup - smp_callin which we don't use */
.inquire_remote_apic = xen_silent_inquire,
.read = xen_apic_read,
.write = xen_apic_write,
.eoi_write = xen_apic_write,
.icr_read = xen_apic_icr_read,
.icr_write = xen_apic_icr_write,
.wait_icr_idle = xen_noop,
.safe_wait_icr_idle = xen_safe_apic_wait_icr_idle,
#ifdef CONFIG_X86_32
/* generic_processor_info and setup_local_APIC. */
.x86_32_early_logical_apicid = xen_x86_32_early_logical_apicid,
#endif
};
static void __init xen_apic_check(void)
{
if (apic == &xen_pv_apic)
return;
pr_info("Switched APIC routing from %s to %s.\n", apic->name,
xen_pv_apic.name);
apic = &xen_pv_apic;
}
void __init xen_init_apic(void)
{
x86_io_apic_ops.read = xen_io_apic_read;
/* On PV guests the APIC CPUID bit is disabled so none of the
* routines end up executing. */
if (!xen_initial_domain())
apic = &xen_pv_apic;
x86_platform.apic_post_init = xen_apic_check;
}
apic_driver(xen_pv_apic);
|
