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1/*
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 *
11 * CPUs are exported via sysfs in the class/cpu/devices/
12 * directory.
13 */
14#ifndef _LINUX_CPU_H_
15#define _LINUX_CPU_H_
16
17#include <linux/sysdev.h>
18#include <linux/node.h>
19#include <linux/compiler.h>
20#include <linux/cpumask.h>
21
22struct cpu {
23 int node_id; /* The node which contains the CPU */
24 int hotpluggable; /* creates sysfs control file if hotpluggable */
25 struct sys_device sysdev;
26};
27
28extern int register_cpu(struct cpu *cpu, int num);
29extern struct sys_device *get_cpu_sysdev(unsigned cpu);
30
31extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
32extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
33
34extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
35extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
36
37extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
38
39#ifdef CONFIG_HOTPLUG_CPU
40extern void unregister_cpu(struct cpu *cpu);
41extern ssize_t arch_cpu_probe(const char *, size_t);
42extern ssize_t arch_cpu_release(const char *, size_t);
43#endif
44struct notifier_block;
45
46/*
47 * CPU notifier priorities.
48 */
49enum {
50 /*
51 * SCHED_ACTIVE marks a cpu which is coming up active during
52 * CPU_ONLINE and CPU_DOWN_FAILED and must be the first
53 * notifier. CPUSET_ACTIVE adjusts cpuset according to
54 * cpu_active mask right after SCHED_ACTIVE. During
55 * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are
56 * ordered in the similar way.
57 *
58 * This ordering guarantees consistent cpu_active mask and
59 * migration behavior to all cpu notifiers.
60 */
61 CPU_PRI_SCHED_ACTIVE = INT_MAX,
62 CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1,
63 CPU_PRI_SCHED_INACTIVE = INT_MIN + 1,
64 CPU_PRI_CPUSET_INACTIVE = INT_MIN,
65
66 /* migration should happen before other stuff but after perf */
67 CPU_PRI_PERF = 20,
68 CPU_PRI_MIGRATION = 10,
69 /* prepare workqueues for other notifiers */
70 CPU_PRI_WORKQUEUE = 5,
71};
72
73#ifdef CONFIG_SMP
74/* Need to know about CPUs going up/down? */
75#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
76#define cpu_notifier(fn, pri) { \
77 static struct notifier_block fn##_nb __cpuinitdata = \
78 { .notifier_call = fn, .priority = pri }; \
79 register_cpu_notifier(&fn##_nb); \
80}
81#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
82#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
83#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
84#ifdef CONFIG_HOTPLUG_CPU
85extern int register_cpu_notifier(struct notifier_block *nb);
86extern void unregister_cpu_notifier(struct notifier_block *nb);
87#else
88
89#ifndef MODULE
90extern int register_cpu_notifier(struct notifier_block *nb);
91#else
92static inline int register_cpu_notifier(struct notifier_block *nb)
93{
94 return 0;
95}
96#endif
97
98static inline void unregister_cpu_notifier(struct notifier_block *nb)
99{
100}
101#endif
102
103int cpu_up(unsigned int cpu);
104void notify_cpu_starting(unsigned int cpu);
105extern void cpu_maps_update_begin(void);
106extern void cpu_maps_update_done(void);
107
108#else /* CONFIG_SMP */
109
110#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
111
112static inline int register_cpu_notifier(struct notifier_block *nb)
113{
114 return 0;
115}
116
117static inline void unregister_cpu_notifier(struct notifier_block *nb)
118{
119}
120
121static inline void cpu_maps_update_begin(void)
122{
123}
124
125static inline void cpu_maps_update_done(void)
126{
127}
128
129#endif /* CONFIG_SMP */
130extern struct sysdev_class cpu_sysdev_class;
131
132#ifdef CONFIG_HOTPLUG_CPU
133/* Stop CPUs going up and down. */
134
135extern void get_online_cpus(void);
136extern void put_online_cpus(void);
137#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
138#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
139#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
140int cpu_down(unsigned int cpu);
141
142#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
143extern void cpu_hotplug_driver_lock(void);
144extern void cpu_hotplug_driver_unlock(void);
145#else
146static inline void cpu_hotplug_driver_lock(void)
147{
148}
149
150static inline void cpu_hotplug_driver_unlock(void)
151{
152}
153#endif
154
155#else /* CONFIG_HOTPLUG_CPU */
156
157#define get_online_cpus() do { } while (0)
158#define put_online_cpus() do { } while (0)
159#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
160/* These aren't inline functions due to a GCC bug. */
161#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
162#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
163#endif /* CONFIG_HOTPLUG_CPU */
164
165#ifdef CONFIG_PM_SLEEP_SMP
166extern int suspend_cpu_hotplug;
167
168extern int disable_nonboot_cpus(void);
169extern void enable_nonboot_cpus(void);
170#else /* !CONFIG_PM_SLEEP_SMP */
171#define suspend_cpu_hotplug 0
172
173static inline int disable_nonboot_cpus(void) { return 0; }
174static inline void enable_nonboot_cpus(void) {}
175#endif /* !CONFIG_PM_SLEEP_SMP */
176
177#endif /* _LINUX_CPU_H_ */