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
|
/*
* This file is part of the coreboot project.
*
* Copyright 2013 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <stdint.h>
#include <stdlib.h>
#include <arch/lib_helpers.h>
#include <cpu/cpu.h>
#include <console/console.h>
#include <smp/node.h>
#include "cpu-internal.h"
struct cpu_info cpu_infos[CONFIG_MAX_CPUS];
struct cpu_info *bsp_cpu_info;
struct cpu_info *cpu_info(void)
{
return cpu_info_for_cpu(smp_processor_id());
}
size_t cpus_online(void)
{
int i;
size_t num = 0;
for (i = 0; i < ARRAY_SIZE(cpu_infos); i++) {
if (cpu_online(cpu_info_for_cpu(i)))
num++;
}
return num;
}
static inline int action_queue_empty(struct cpu_action_queue *q)
{
return load_acquire_exclusive(&q->todo) == NULL;
}
static inline int action_completed(struct cpu_action_queue *q,
struct cpu_action *action)
{
return load_acquire(&q->completed) == action;
}
static inline void wait_for_action_queue_slot(struct cpu_action_queue *q)
{
while (!action_queue_empty(q))
wfe();
}
static void wait_for_action_complete(struct cpu_action_queue *q,
struct cpu_action *a)
{
while (!action_completed(q, a))
wfe();
}
static struct cpu_action *wait_for_action(struct cpu_action_queue *q,
struct cpu_action *local)
{
struct cpu_action *action;
while (action_queue_empty(q))
wfe();
/*
* Keep original address, but use a local copy for async processing.
*/
do {
action = load_acquire_exclusive(&q->todo);
*local = *action;
} while (!store_release_exclusive(&q->todo, NULL));
return action;
}
static void queue_action(struct cpu_action_queue *q, struct cpu_action *action)
{
do {
wait_for_action_queue_slot(q);
if (load_acquire_exclusive(&q->todo) != NULL)
continue;
} while (!store_release_exclusive(&q->todo, action));
}
static void action_queue_complete(struct cpu_action_queue *q,
struct cpu_action *action)
{
/* Mark completion and send events to waiters. */
store_release(&q->completed, action);
sev();
}
static void action_run(struct cpu_action *action)
{
action->run(action->arg);
}
static void action_run_on_cpu(struct cpu_info *ci, struct cpu_action *action,
int sync)
{
struct cpu_action_queue *q = &ci->action_queue;
/* Don't run actions on non-online cpus. */
if (!cpu_online(ci))
return;
if (ci->id == smp_processor_id()) {
action->run(action->arg);
return;
}
queue_action(q, action);
/* Wait for CPU to pick it up. Empty slot means it was picked up. */
wait_for_action_queue_slot(q);
/* Wait for completion if requested. */
if (sync)
wait_for_action_complete(q, action);
}
static int __arch_run_on_cpu(unsigned int cpu, struct cpu_action *action,
int sync)
{
struct cpu_info *ci;
if (cpu >= CONFIG_MAX_CPUS)
return -1;
ci = cpu_info_for_cpu(cpu);
action_run_on_cpu(ci, action, sync);
return 0;
}
int arch_run_on_cpu(unsigned int cpu, struct cpu_action *action)
{
return __arch_run_on_cpu(cpu, action, 1);
}
int arch_run_on_cpu_async(unsigned int cpu, struct cpu_action *action)
{
return __arch_run_on_cpu(cpu, action, 0);
}
static int __arch_run_on_all_cpus(struct cpu_action *action, int sync)
{
int i;
for (i = 0; i < CONFIG_MAX_CPUS; i++)
action_run_on_cpu(cpu_info_for_cpu(i), action, sync);
return 0;
}
static int __arch_run_on_all_cpus_but_self(struct cpu_action *action, int sync)
{
int i;
struct cpu_info *me = cpu_info();
for (i = 0; i < CONFIG_MAX_CPUS; i++) {
struct cpu_info *ci = cpu_info_for_cpu(i);
if (ci == me)
continue;
action_run_on_cpu(ci, action, sync);
}
return 0;
}
int arch_run_on_all_cpus(struct cpu_action *action)
{
return __arch_run_on_all_cpus(action, 1);
}
int arch_run_on_all_cpus_async(struct cpu_action *action)
{
return __arch_run_on_all_cpus(action, 0);
}
int arch_run_on_all_cpus_but_self(struct cpu_action *action)
{
return __arch_run_on_all_cpus_but_self(action, 1);
}
int arch_run_on_all_cpus_but_self_async(struct cpu_action *action)
{
return __arch_run_on_all_cpus_but_self(action, 0);
}
void arch_cpu_wait_for_action(void)
{
struct cpu_info *ci = cpu_info();
struct cpu_action_queue *q = &ci->action_queue;
while (1) {
struct cpu_action *orig;
struct cpu_action action;
orig = wait_for_action(q, &action);
action_run(&action);
action_queue_complete(q, orig);
}
}
#if IS_ENABLED(CONFIG_SMP)
int boot_cpu(void)
{
return cpu_is_bsp();
}
#endif
|
