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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * include/linux/cpu.h - generic cpu definition
3 *
4 * This is mainly for topological representation. We define the
5 * basic 'struct cpu' here, which can be embedded in per-arch
6 * definitions of processors.
7 *
8 * Basic handling of the devices is done in drivers/base/cpu.c
9 * and system devices are handled in drivers/base/sys.c.
10 *
Rolf Eike Beerd51fe1b2005-09-02 08:59:25 +020011 * CPUs are exported via sysfs in the class/cpu/devices/
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * directory.
13 *
14 * Per-cpu interfaces can be implemented using a struct device_interface.
15 * See the following for how to do this:
16 * - drivers/base/intf.c
17 * - Documentation/driver-model/interface.txt
18 */
19#ifndef _LINUX_CPU_H_
20#define _LINUX_CPU_H_
21
22#include <linux/sysdev.h>
23#include <linux/node.h>
24#include <linux/compiler.h>
25#include <linux/cpumask.h>
26#include <asm/semaphore.h>
Gautham R Shenoyf7dff2b2006-12-06 20:38:58 -080027#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29struct cpu {
30 int node_id; /* The node which contains the CPU */
Siddha, Suresh B72486f12006-12-07 02:14:10 +010031 int hotpluggable; /* creates sysfs control file if hotpluggable */
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 struct sys_device sysdev;
33};
34
KAMEZAWA Hiroyuki76b67ed92006-06-27 02:53:41 -070035extern int register_cpu(struct cpu *cpu, int num);
Andrew Mortona29d6422006-03-07 23:53:25 -080036extern struct sys_device *get_cpu_sysdev(unsigned cpu);
Christian Krafft0344c6c2006-10-24 18:31:24 +020037
38extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
39extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
40
41extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
42extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
43
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#ifdef CONFIG_HOTPLUG_CPU
KAMEZAWA Hiroyuki76b67ed92006-06-27 02:53:41 -070046extern void unregister_cpu(struct cpu *cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#endif
48struct notifier_block;
49
50#ifdef CONFIG_SMP
51/* Need to know about CPUs going up/down? */
52extern int register_cpu_notifier(struct notifier_block *nb);
Chandra Seetharaman65edc682006-06-27 02:54:08 -070053#ifdef CONFIG_HOTPLUG_CPU
Linus Torvalds1da177e2005-04-16 15:20:36 -070054extern void unregister_cpu_notifier(struct notifier_block *nb);
Chandra Seetharaman65edc682006-06-27 02:54:08 -070055#else
56static inline void unregister_cpu_notifier(struct notifier_block *nb)
57{
58}
59#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61int cpu_up(unsigned int cpu);
62
63#else
64
65static inline int register_cpu_notifier(struct notifier_block *nb)
66{
67 return 0;
68}
69static inline void unregister_cpu_notifier(struct notifier_block *nb)
70{
71}
72
73#endif /* CONFIG_SMP */
74extern struct sysdev_class cpu_sysdev_class;
75
76#ifdef CONFIG_HOTPLUG_CPU
77/* Stop CPUs going up and down. */
Gautham R Shenoyf7dff2b2006-12-06 20:38:58 -080078
79static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
80{
81 mutex_lock(cpu_hp_mutex);
82}
83
84static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
85{
86 mutex_unlock(cpu_hp_mutex);
87}
88
Ashok Raja9d9baa2005-11-28 13:43:46 -080089extern void lock_cpu_hotplug(void);
90extern void unlock_cpu_hotplug(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091#define hotcpu_notifier(fn, pri) { \
92 static struct notifier_block fn##_nb = \
93 { .notifier_call = fn, .priority = pri }; \
94 register_cpu_notifier(&fn##_nb); \
95}
Chandra Seetharaman39f48852006-06-27 02:54:10 -070096#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
97#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098int cpu_down(unsigned int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
Gautham R Shenoyf7dff2b2006-12-06 20:38:58 -0800100
101#else /* CONFIG_HOTPLUG_CPU */
102
103static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
104{ }
105static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
106{ }
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108#define lock_cpu_hotplug() do { } while (0)
109#define unlock_cpu_hotplug() do { } while (0)
110#define lock_cpu_hotplug_interruptible() 0
Ingo Molnar023160672006-12-06 20:38:17 -0800111#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
112#define register_hotcpu_notifier(nb) do { (void)(nb); } while (0)
113#define unregister_hotcpu_notifier(nb) do { (void)(nb); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115/* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */
116static inline int cpu_is_offline(int cpu) { return 0; }
Gautham R Shenoyf7dff2b2006-12-06 20:38:58 -0800117#endif /* CONFIG_HOTPLUG_CPU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Rafael J. Wysockie3920fb2006-09-25 23:32:48 -0700119#ifdef CONFIG_SUSPEND_SMP
120extern int disable_nonboot_cpus(void);
121extern void enable_nonboot_cpus(void);
122#else
123static inline int disable_nonboot_cpus(void) { return 0; }
124static inline void enable_nonboot_cpus(void) {}
125#endif
126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127#endif /* _LINUX_CPU_H_ */