2  * CPU subsystem support
9 #include <linux/cpu.h>
19 	.name = "cpu",
20 	.dev_name = "cpu",
31 	struct cpu *cpu = container_of(dev, struct cpu, dev);  in show_online()  local
33 	return sprintf(buf, "%u\n", !!cpu_online(cpu->dev.id));  in show_online()
40 	struct cpu *cpu = container_of(dev, struct cpu, dev);  in store_online()  local
46 		ret = cpu_down(cpu->dev.id);  in store_online()
51 		ret = cpu_up(cpu->dev.id);  in store_online()
66 static void __cpuinit register_cpu_control(struct cpu *cpu)  in register_cpu_control()  argument
68 	device_create_file(&cpu->dev, &dev_attr_online);  in register_cpu_control()
70 void unregister_cpu(struct cpu *cpu)  in unregister_cpu()  argument
72 	int logical_cpu = cpu->dev.id;  in unregister_cpu()
76 	device_remove_file(&cpu->dev, &dev_attr_online);  in unregister_cpu()
78 	device_unregister(&cpu->dev);  in unregister_cpu()
105 static inline void register_cpu_control(struct cpu *cpu)  in register_cpu_control()  argument
116 	struct cpu *cpu = container_of(dev, struct cpu, dev);  in show_crash_notes()  local
121 	cpunum = cpu->dev.id;  in show_crash_notes()
124 	 * Might be reading other cpu's data based on which cpu read thread  in show_crash_notes()
125 	 * has been scheduled. But cpu data (memory) is allocated once during  in show_crash_notes()
137  * Print cpu online, possible, present, and system maps
219 	 * the only way to handle the issue of statically allocated cpu  in cpu_device_release()
220 	 * devices.  The different architectures will have their cpu device  in cpu_device_release()
223 	 * by the cpu device.  in cpu_device_release()
231  * register_cpu - Setup a sysfs device for a CPU.
232  * @cpu - cpu->hotpluggable field set to 1 will generate a control file in
233  *	  sysfs for this CPU.
234  * @num - CPU number to use when creating the device.
236  * Initialize and register the CPU device.
238 int __cpuinit register_cpu(struct cpu *cpu, int num)  in register_cpu()  argument
242 	cpu->node_id = cpu_to_node(num);  in register_cpu()
243 	memset(&cpu->dev, 0x00, sizeof(struct device));  in register_cpu()
244 	cpu->dev.id = num;  in register_cpu()
245 	cpu->dev.bus = &cpu_subsys;  in register_cpu()
246 	cpu->dev.release = cpu_device_release;  in register_cpu()
247 	error = device_register(&cpu->dev);  in register_cpu()
248 	if (!error && cpu->hotpluggable)  in register_cpu()
249 		register_cpu_control(cpu);  in register_cpu()
251 		per_cpu(cpu_sys_devices, num) = &cpu->dev;  in register_cpu()
257 		error = device_create_file(&cpu->dev, &dev_attr_crash_notes);  in register_cpu()
262 struct device *get_cpu_device(unsigned cpu)  in get_cpu_device()  argument
264 	if (cpu < nr_cpu_ids && cpu_possible(cpu))  in get_cpu_device()
265 		return per_cpu(cpu_sys_devices, cpu);  in get_cpu_device()
293 bool cpu_is_hotpluggable(unsigned cpu)  in cpu_is_hotpluggable()  argument
295 	struct device *dev = get_cpu_device(cpu);  in cpu_is_hotpluggable()
296 	return dev && container_of(dev, struct cpu, dev)->hotpluggable;  in cpu_is_hotpluggable()
301 static DEFINE_PER_CPU(struct cpu, cpu_devices);
311 			panic("Failed to register CPU device");  in cpu_dev_register_generic()
319 		panic("Failed to register CPU subsystem");  in cpu_dev_init()