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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>
Gautham R Shenoyf7dff2b2006-12-06 20:38:58 -080026#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28struct cpu {
29 int node_id; /* The node which contains the CPU */
Siddha, Suresh B72486f12006-12-07 02:14:10 +010030 int hotpluggable; /* creates sysfs control file if hotpluggable */
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 struct sys_device sysdev;
32};
33
KAMEZAWA Hiroyuki76b67ed92006-06-27 02:53:41 -070034extern int register_cpu(struct cpu *cpu, int num);
Andrew Mortona29d6422006-03-07 23:53:25 -080035extern struct sys_device *get_cpu_sysdev(unsigned cpu);
Christian Krafft0344c6c2006-10-24 18:31:24 +020036
37extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
38extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
39
40extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
41extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
42
Ralf Baechle3367b992007-05-08 00:27:52 -070043extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
Christian Krafft0344c6c2006-10-24 18:31:24 +020044
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? */
Chandra Seetharaman65edc682006-06-27 02:54:08 -070052#ifdef CONFIG_HOTPLUG_CPU
Avi Kivity47e627b2007-02-12 00:54:43 -080053extern int register_cpu_notifier(struct notifier_block *nb);
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
Avi Kivity47e627b2007-02-12 00:54:43 -080056
57#ifndef MODULE
58extern int register_cpu_notifier(struct notifier_block *nb);
59#else
60static inline int register_cpu_notifier(struct notifier_block *nb)
61{
62 return 0;
63}
64#endif
65
Chandra Seetharaman65edc682006-06-27 02:54:08 -070066static inline void unregister_cpu_notifier(struct notifier_block *nb)
67{
68}
69#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71int cpu_up(unsigned int cpu);
Ingo Molnard0d23b52008-01-25 21:08:02 +010072extern void cpu_hotplug_init(void);
Oleg Nesterov3da1c842008-07-25 01:47:50 -070073extern void cpu_maps_update_begin(void);
74extern void cpu_maps_update_done(void);
Ingo Molnard0d23b52008-01-25 21:08:02 +010075
Oleg Nesterov3da1c842008-07-25 01:47:50 -070076#else /* CONFIG_SMP */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78static inline int register_cpu_notifier(struct notifier_block *nb)
79{
80 return 0;
81}
Ingo Molnard0d23b52008-01-25 21:08:02 +010082
Linus Torvalds1da177e2005-04-16 15:20:36 -070083static inline void unregister_cpu_notifier(struct notifier_block *nb)
84{
85}
86
Ingo Molnard0d23b52008-01-25 21:08:02 +010087static inline void cpu_hotplug_init(void)
88{
89}
90
Oleg Nesterov3da1c842008-07-25 01:47:50 -070091static inline void cpu_maps_update_begin(void)
92{
93}
94
95static inline void cpu_maps_update_done(void)
96{
97}
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099#endif /* CONFIG_SMP */
100extern struct sysdev_class cpu_sysdev_class;
101
102#ifdef CONFIG_HOTPLUG_CPU
103/* Stop CPUs going up and down. */
Gautham R Shenoyf7dff2b2006-12-06 20:38:58 -0800104
105static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
106{
107 mutex_lock(cpu_hp_mutex);
108}
109
110static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
111{
112 mutex_unlock(cpu_hp_mutex);
113}
114
Gautham R Shenoy86ef5c92008-01-25 21:08:02 +0100115extern void get_online_cpus(void);
116extern void put_online_cpus(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#define hotcpu_notifier(fn, pri) { \
Sam Ravnborgf718e312008-04-29 00:58:47 -0700118 static struct notifier_block fn##_nb __cpuinitdata = \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 { .notifier_call = fn, .priority = pri }; \
120 register_cpu_notifier(&fn##_nb); \
121}
Chandra Seetharaman39f48852006-06-27 02:54:10 -0700122#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
123#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124int cpu_down(unsigned int cpu);
Gautham R Shenoyf7dff2b2006-12-06 20:38:58 -0800125
126#else /* CONFIG_HOTPLUG_CPU */
127
128static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
129{ }
130static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
131{ }
132
Gautham R Shenoy86ef5c92008-01-25 21:08:02 +0100133#define get_online_cpus() do { } while (0)
134#define put_online_cpus() do { } while (0)
Ingo Molnar023160672006-12-06 20:38:17 -0800135#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
Satyam Sharma761bb432007-10-18 03:06:38 -0700136/* These aren't inline functions due to a GCC bug. */
137#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
138#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
Gautham R Shenoyf7dff2b2006-12-06 20:38:58 -0800139#endif /* CONFIG_HOTPLUG_CPU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Rafael J. Wysockif3de4be2007-08-30 23:56:29 -0700141#ifdef CONFIG_PM_SLEEP_SMP
Rafael J. Wysocki1d64b9c2007-04-01 23:49:49 -0700142extern int suspend_cpu_hotplug;
143
Rafael J. Wysockie3920fb2006-09-25 23:32:48 -0700144extern int disable_nonboot_cpus(void);
145extern void enable_nonboot_cpus(void);
Rafael J. Wysockif3de4be2007-08-30 23:56:29 -0700146#else /* !CONFIG_PM_SLEEP_SMP */
Rafael J. Wysocki1d64b9c2007-04-01 23:49:49 -0700147#define suspend_cpu_hotplug 0
148
Rafael J. Wysockie3920fb2006-09-25 23:32:48 -0700149static inline int disable_nonboot_cpus(void) { return 0; }
150static inline void enable_nonboot_cpus(void) {}
Rafael J. Wysockif3de4be2007-08-30 23:56:29 -0700151#endif /* !CONFIG_PM_SLEEP_SMP */
Rafael J. Wysockie3920fb2006-09-25 23:32:48 -0700152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153#endif /* _LINUX_CPU_H_ */