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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/node.h>
18#include <linux/compiler.h>
19#include <linux/cpumask.h>
20
21struct device;
22
23struct cpu {
24 int node_id; /* The node which contains the CPU */
25 int hotpluggable; /* creates sysfs control file if hotpluggable */
26 struct device dev;
27};
28
29extern int register_cpu(struct cpu *cpu, int num);
30extern struct device *get_cpu_device(unsigned cpu);
31extern bool cpu_is_hotpluggable(unsigned cpu);
32
33extern int cpu_add_dev_attr(struct device_attribute *attr);
34extern void cpu_remove_dev_attr(struct device_attribute *attr);
35
36extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
37extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
38
39extern int sched_create_sysfs_power_savings_entries(struct device *dev);
40
41#ifdef CONFIG_HOTPLUG_CPU
42extern void unregister_cpu(struct cpu *cpu);
43extern ssize_t arch_cpu_probe(const char *, size_t);
44extern ssize_t arch_cpu_release(const char *, size_t);
45#endif
46struct notifier_block;
47
48#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
49extern int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env);
50extern ssize_t arch_print_cpu_modalias(struct device *dev,
51 struct device_attribute *attr,
52 char *bufptr);
53#endif
54
55/*
56 * CPU notifier priorities.
57 */
58enum {
59 /*
60 * SCHED_ACTIVE marks a cpu which is coming up active during
61 * CPU_ONLINE and CPU_DOWN_FAILED and must be the first
62 * notifier. CPUSET_ACTIVE adjusts cpuset according to
63 * cpu_active mask right after SCHED_ACTIVE. During
64 * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are
65 * ordered in the similar way.
66 *
67 * This ordering guarantees consistent cpu_active mask and
68 * migration behavior to all cpu notifiers.
69 */
70 CPU_PRI_SCHED_ACTIVE = INT_MAX,
71 CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1,
72 CPU_PRI_SCHED_INACTIVE = INT_MIN + 1,
73 CPU_PRI_CPUSET_INACTIVE = INT_MIN,
74
75 /* migration should happen before other stuff but after perf */
76 CPU_PRI_PERF = 20,
77 CPU_PRI_MIGRATION = 10,
78 /* prepare workqueues for other notifiers */
79 CPU_PRI_WORKQUEUE = 5,
80};
81
82#define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
83#define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
84#define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
85#define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */
86#define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */
87#define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
88#define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task,
89 * not handling interrupts, soon dead.
90 * Called on the dying cpu, interrupts
91 * are already disabled. Must not
92 * sleep, must not fail */
93#define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
94 * lock is dropped */
95#define CPU_STARTING 0x000A /* CPU (unsigned)v soon running.
96 * Called on the new cpu, just before
97 * enabling interrupts. Must not sleep,
98 * must not fail */
99
100/* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
101 * operation in progress
102 */
103#define CPU_TASKS_FROZEN 0x0010
104
105#define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
106#define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
107#define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
108#define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
109#define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
110#define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
111#define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN)
112#define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN)
113
114
115#ifdef CONFIG_SMP
116/* Need to know about CPUs going up/down? */
117#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
118#define cpu_notifier(fn, pri) { \
119 static struct notifier_block fn##_nb __cpuinitdata = \
120 { .notifier_call = fn, .priority = pri }; \
121 register_cpu_notifier(&fn##_nb); \
122}
123#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
124#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
125#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
126#ifdef CONFIG_HOTPLUG_CPU
127extern int register_cpu_notifier(struct notifier_block *nb);
128extern void unregister_cpu_notifier(struct notifier_block *nb);
129#else
130
131#ifndef MODULE
132extern int register_cpu_notifier(struct notifier_block *nb);
133#else
134static inline int register_cpu_notifier(struct notifier_block *nb)
135{
136 return 0;
137}
138#endif
139
140static inline void unregister_cpu_notifier(struct notifier_block *nb)
141{
142}
143#endif
144
145int cpu_up(unsigned int cpu);
146void notify_cpu_starting(unsigned int cpu);
147extern void cpu_maps_update_begin(void);
148extern void cpu_maps_update_done(void);
149
150#else /* CONFIG_SMP */
151
152#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
153
154static inline int register_cpu_notifier(struct notifier_block *nb)
155{
156 return 0;
157}
158
159static inline void unregister_cpu_notifier(struct notifier_block *nb)
160{
161}
162
163static inline void cpu_maps_update_begin(void)
164{
165}
166
167static inline void cpu_maps_update_done(void)
168{
169}
170
171#endif /* CONFIG_SMP */
172extern struct bus_type cpu_subsys;
173
174#ifdef CONFIG_HOTPLUG_CPU
175/* Stop CPUs going up and down. */
176
177extern void get_online_cpus(void);
178extern void put_online_cpus(void);
179#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
180#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
181#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
182int cpu_down(unsigned int cpu);
183
184#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
185extern void cpu_hotplug_driver_lock(void);
186extern void cpu_hotplug_driver_unlock(void);
187#else
188static inline void cpu_hotplug_driver_lock(void)
189{
190}
191
192static inline void cpu_hotplug_driver_unlock(void)
193{
194}
195#endif
196
197#else /* CONFIG_HOTPLUG_CPU */
198
199#define get_online_cpus() do { } while (0)
200#define put_online_cpus() do { } while (0)
201#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
202/* These aren't inline functions due to a GCC bug. */
203#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
204#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
205#endif /* CONFIG_HOTPLUG_CPU */
206
207#ifdef CONFIG_PM_SLEEP_SMP
208extern int disable_nonboot_cpus(void);
209extern void enable_nonboot_cpus(void);
210#else /* !CONFIG_PM_SLEEP_SMP */
211static inline int disable_nonboot_cpus(void) { return 0; }
212static inline void enable_nonboot_cpus(void) {}
213#endif /* !CONFIG_PM_SLEEP_SMP */
214
215#endif /* _LINUX_CPU_H_ */