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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 Hiroyuki76b67ed2006-06-27 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
Ralf Baechle3367b992007-05-08 00:27:52 -070044extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
Christian Krafft0344c6c2006-10-24 18:31:24 +020045
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#ifdef CONFIG_HOTPLUG_CPU
KAMEZAWA Hiroyuki76b67ed2006-06-27 02:53:41 -070047extern void unregister_cpu(struct cpu *cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#endif
49struct notifier_block;
50
51#ifdef CONFIG_SMP
52/* Need to know about CPUs going up/down? */
Chandra Seetharaman65edc682006-06-27 02:54:08 -070053#ifdef CONFIG_HOTPLUG_CPU
Avi Kivity47e627b2007-02-12 00:54:43 -080054extern int register_cpu_notifier(struct notifier_block *nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055extern void unregister_cpu_notifier(struct notifier_block *nb);
Chandra Seetharaman65edc682006-06-27 02:54:08 -070056#else
Avi Kivity47e627b2007-02-12 00:54:43 -080057
58#ifndef MODULE
59extern int register_cpu_notifier(struct notifier_block *nb);
60#else
61static inline int register_cpu_notifier(struct notifier_block *nb)
62{
63 return 0;
64}
65#endif
66
Chandra Seetharaman65edc682006-06-27 02:54:08 -070067static inline void unregister_cpu_notifier(struct notifier_block *nb)
68{
69}
70#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72int cpu_up(unsigned int cpu);
73
74#else
75
76static inline int register_cpu_notifier(struct notifier_block *nb)
77{
78 return 0;
79}
80static inline void unregister_cpu_notifier(struct notifier_block *nb)
81{
82}
83
84#endif /* CONFIG_SMP */
85extern struct sysdev_class cpu_sysdev_class;
86
87#ifdef CONFIG_HOTPLUG_CPU
88/* Stop CPUs going up and down. */
Gautham R Shenoyf7dff2b2006-12-06 20:38:58 -080089
90static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
91{
92 mutex_lock(cpu_hp_mutex);
93}
94
95static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
96{
97 mutex_unlock(cpu_hp_mutex);
98}
99
Ashok Raja9d9baa2005-11-28 13:43:46 -0800100extern void lock_cpu_hotplug(void);
101extern void unlock_cpu_hotplug(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102#define hotcpu_notifier(fn, pri) { \
103 static struct notifier_block fn##_nb = \
104 { .notifier_call = fn, .priority = pri }; \
105 register_cpu_notifier(&fn##_nb); \
106}
Chandra Seetharaman39f48852006-06-27 02:54:10 -0700107#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
108#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109int cpu_down(unsigned int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
Gautham R Shenoyf7dff2b2006-12-06 20:38:58 -0800111
112#else /* CONFIG_HOTPLUG_CPU */
113
114static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
115{ }
116static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
117{ }
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119#define lock_cpu_hotplug() do { } while (0)
120#define unlock_cpu_hotplug() do { } while (0)
Ingo Molnar02316062006-12-06 20:38:17 -0800121#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
122#define register_hotcpu_notifier(nb) do { (void)(nb); } while (0)
123#define unregister_hotcpu_notifier(nb) do { (void)(nb); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125/* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */
126static inline int cpu_is_offline(int cpu) { return 0; }
Gautham R Shenoyf7dff2b2006-12-06 20:38:58 -0800127#endif /* CONFIG_HOTPLUG_CPU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Rafael J. Wysockif3de4be2007-08-30 23:56:29 -0700129#ifdef CONFIG_PM_SLEEP_SMP
Rafael J. Wysocki1d64b9c2007-04-01 23:49:49 -0700130extern int suspend_cpu_hotplug;
131
Rafael J. Wysockie3920fb2006-09-25 23:32:48 -0700132extern int disable_nonboot_cpus(void);
133extern void enable_nonboot_cpus(void);
Rafael J. Wysockif3de4be2007-08-30 23:56:29 -0700134#else /* !CONFIG_PM_SLEEP_SMP */
Rafael J. Wysocki1d64b9c2007-04-01 23:49:49 -0700135#define suspend_cpu_hotplug 0
136
Rafael J. Wysockie3920fb2006-09-25 23:32:48 -0700137static inline int disable_nonboot_cpus(void) { return 0; }
138static inline void enable_nonboot_cpus(void) {}
Rafael J. Wysockif3de4be2007-08-30 23:56:29 -0700139#endif /* !CONFIG_PM_SLEEP_SMP */
Rafael J. Wysockie3920fb2006-09-25 23:32:48 -0700140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141#endif /* _LINUX_CPU_H_ */