/* * include/linux/cpu.h - generic cpu definition * * This is mainly for topological representation. We define the * basic 'struct cpu' here, which can be embedded in per-arch * definitions of processors. * * Basic handling of the devices is done in drivers/base/cpu.c * and system devices are handled in drivers/base/sys.c. * * CPUs are exported via sysfs in the class/cpu/devices/ * directory. */ #ifndef _LINUX_CPU_H_ #define _LINUX_CPU_H_ #include <linux/device.h> #include <linux/node.h> #include <linux/compiler.h> #include <linux/cpumask.h> struct cpu { int node_id; /* The node which contains the CPU */ int hotpluggable; /* creates sysfs control file if hotpluggable */ struct device dev; }; extern int register_cpu(struct cpu *cpu, int num); extern struct device *get_cpu_device(unsigned cpu); extern bool cpu_is_hotpluggable(unsigned cpu); extern int cpu_add_dev_attr(struct device_attribute *attr); extern void cpu_remove_dev_attr(struct device_attribute *attr); extern int cpu_add_dev_attr_group(struct attribute_group *attrs); extern void cpu_remove_dev_attr_group(struct attribute_group *attrs); extern int sched_create_sysfs_power_savings_entries(struct device *dev); #ifdef CONFIG_HOTPLUG_CPU extern void unregister_cpu(struct cpu *cpu); extern ssize_t arch_cpu_probe(const char *, size_t); extern ssize_t arch_cpu_release(const char *, size_t); #endif struct notifier_block; /* * CPU notifier priorities. */ enum { /* * SCHED_ACTIVE marks a cpu which is coming up active during * CPU_ONLINE and CPU_DOWN_FAILED and must be the first * notifier. CPUSET_ACTIVE adjusts cpuset according to * cpu_active mask right after SCHED_ACTIVE. During * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are * ordered in the similar way. * * This ordering guarantees consistent cpu_active mask and * migration behavior to all cpu notifiers. */ CPU_PRI_SCHED_ACTIVE = INT_MAX, CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1, CPU_PRI_SCHED_INACTIVE = INT_MIN + 1, CPU_PRI_CPUSET_INACTIVE = INT_MIN, /* migration should happen before other stuff but after perf */ CPU_PRI_PERF = 20, CPU_PRI_MIGRATION = 10, /* prepare workqueues for other notifiers */ CPU_PRI_WORKQUEUE = 5, }; #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ #define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task, * not handling interrupts, soon dead. * Called on the dying cpu, interrupts * are already disabled. Must not * sleep, must not fail */ #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug * lock is dropped */ #define CPU_STARTING 0x000A /* CPU (unsigned)v soon running. * Called on the new cpu, just before * enabling interrupts. Must not sleep, * must not fail */ /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend * operation in progress */ #define CPU_TASKS_FROZEN 0x0010 #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN) #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN) #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN) #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) #define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN) #ifdef CONFIG_SMP /* Need to know about CPUs going up/down? */ #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) #define cpu_notifier(fn, pri) { \ static struct notifier_block fn##_nb __cpuinitdata = \ { .notifier_call = fn, .priority = pri }; \ register_cpu_notifier(&fn##_nb); \ } #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ #ifdef CONFIG_HOTPLUG_CPU extern int register_cpu_notifier(struct notifier_block *nb); extern void unregister_cpu_notifier(struct notifier_block *nb); #else #ifndef MODULE extern int register_cpu_notifier(struct notifier_block *nb); #else static inline int register_cpu_notifier(struct notifier_block *nb) { return 0; } #endif static inline void unregister_cpu_notifier(struct notifier_block *nb) { } #endif int cpu_up(unsigned int cpu); void notify_cpu_starting(unsigned int cpu); extern void cpu_maps_update_begin(void); extern void cpu_maps_update_done(void); #else /* CONFIG_SMP */ #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) static inline int register_cpu_notifier(struct notifier_block *nb) { return 0; } static inline void unregister_cpu_notifier(struct notifier_block *nb) { } static inline void cpu_maps_update_begin(void) { } static inline void cpu_maps_update_done(void) { } #endif /* CONFIG_SMP */ extern struct bus_type cpu_subsys; #ifdef CONFIG_HOTPLUG_CPU /* Stop CPUs going up and down. */ extern void get_online_cpus(void); extern void put_online_cpus(void); #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) int cpu_down(unsigned int cpu); #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE extern void cpu_hotplug_driver_lock(void); extern void cpu_hotplug_driver_unlock(void); #else static inline void cpu_hotplug_driver_lock(void) { } static inline void cpu_hotplug_driver_unlock(void) { } #endif #else /* CONFIG_HOTPLUG_CPU */ #define get_online_cpus() do { } while (0) #define put_online_cpus() do { } while (0) #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) /* These aren't inline functions due to a GCC bug. */ #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) #endif /* CONFIG_HOTPLUG_CPU */ #ifdef CONFIG_PM_SLEEP_SMP extern int disable_nonboot_cpus(void); extern void enable_nonboot_cpus(void); #else /* !CONFIG_PM_SLEEP_SMP */ static inline int disable_nonboot_cpus(void) { return 0; } static inline void enable_nonboot_cpus(void) {} #endif /* !CONFIG_PM_SLEEP_SMP */ #define IDLE_START 1 #define IDLE_END 2 void idle_notifier_register(struct notifier_block *n); void idle_notifier_unregister(struct notifier_block *n); void idle_notifier_call_chain(unsigned long val); #endif /* _LINUX_CPU_H_ */