This source file includes following definitions.
- enable_cpu0_hotplug
- _debug_hotplug_cpu
- debug_hotplug_cpu
- arch_register_cpu
- arch_unregister_cpu
- arch_register_cpu
- topology_init
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28 #include <linux/nodemask.h>
29 #include <linux/export.h>
30 #include <linux/mmzone.h>
31 #include <linux/init.h>
32 #include <linux/smp.h>
33 #include <linux/irq.h>
34 #include <asm/cpu.h>
35
36 static DEFINE_PER_CPU(struct x86_cpu, cpu_devices);
37
38 #ifdef CONFIG_HOTPLUG_CPU
39
40 #ifdef CONFIG_BOOTPARAM_HOTPLUG_CPU0
41 static int cpu0_hotpluggable = 1;
42 #else
43 static int cpu0_hotpluggable;
44 static int __init enable_cpu0_hotplug(char *str)
45 {
46 cpu0_hotpluggable = 1;
47 return 1;
48 }
49
50 __setup("cpu0_hotplug", enable_cpu0_hotplug);
51 #endif
52
53 #ifdef CONFIG_DEBUG_HOTPLUG_CPU0
54
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58
59
60 int _debug_hotplug_cpu(int cpu, int action)
61 {
62 struct device *dev = get_cpu_device(cpu);
63 int ret;
64
65 if (!cpu_is_hotpluggable(cpu))
66 return -EINVAL;
67
68 lock_device_hotplug();
69
70 switch (action) {
71 case 0:
72 ret = cpu_down(cpu);
73 if (!ret) {
74 pr_info("DEBUG_HOTPLUG_CPU0: CPU %u is now offline\n", cpu);
75 dev->offline = true;
76 kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
77 } else
78 pr_debug("Can't offline CPU%d.\n", cpu);
79 break;
80 case 1:
81 ret = cpu_up(cpu);
82 if (!ret) {
83 dev->offline = false;
84 kobject_uevent(&dev->kobj, KOBJ_ONLINE);
85 } else {
86 pr_debug("Can't online CPU%d.\n", cpu);
87 }
88 break;
89 default:
90 ret = -EINVAL;
91 }
92
93 unlock_device_hotplug();
94
95 return ret;
96 }
97
98 static int __init debug_hotplug_cpu(void)
99 {
100 _debug_hotplug_cpu(0, 0);
101 return 0;
102 }
103
104 late_initcall_sync(debug_hotplug_cpu);
105 #endif
106
107 int arch_register_cpu(int num)
108 {
109 struct cpuinfo_x86 *c = &cpu_data(num);
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116 if (c->x86_vendor != X86_VENDOR_INTEL ||
117 boot_cpu_has(X86_FEATURE_XENPV))
118 cpu0_hotpluggable = 0;
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128 if (num == 0 && cpu0_hotpluggable) {
129 unsigned int irq;
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134 for_each_active_irq(irq) {
135 if (!IO_APIC_IRQ(irq) && irq_has_action(irq)) {
136 cpu0_hotpluggable = 0;
137 break;
138 }
139 }
140 }
141 if (num || cpu0_hotpluggable)
142 per_cpu(cpu_devices, num).cpu.hotpluggable = 1;
143
144 return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
145 }
146 EXPORT_SYMBOL(arch_register_cpu);
147
148 void arch_unregister_cpu(int num)
149 {
150 unregister_cpu(&per_cpu(cpu_devices, num).cpu);
151 }
152 EXPORT_SYMBOL(arch_unregister_cpu);
153 #else
154
155 static int __init arch_register_cpu(int num)
156 {
157 return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
158 }
159 #endif
160
161 static int __init topology_init(void)
162 {
163 int i;
164
165 #ifdef CONFIG_NUMA
166 for_each_online_node(i)
167 register_one_node(i);
168 #endif
169
170 for_each_present_cpu(i)
171 arch_register_cpu(i);
172
173 return 0;
174 }
175 subsys_initcall(topology_init);