| /* |
| * 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/node.h> |
| #include <linux/compiler.h> |
| #include <linux/cpumask.h> |
| |
| struct device; |
| |
| 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); |
| |
| #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; |
| |
| #ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE |
| extern int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env); |
| extern ssize_t arch_print_cpu_modalias(struct device *dev, |
| struct device_attribute *attr, |
| char *bufptr); |
| #endif |
| |
| /* |
| * 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, |
| /* bring up workqueues before normal notifiers and down after */ |
| CPU_PRI_WORKQUEUE_UP = 5, |
| CPU_PRI_WORKQUEUE_DOWN = -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) |
| void clear_tasks_mm_cpumask(int cpu); |
| 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 */ |
| |
| enum cpuhp_state { |
| CPUHP_OFFLINE, |
| CPUHP_ONLINE, |
| }; |
| |
| void cpu_startup_entry(enum cpuhp_state state); |
| void cpu_idle(void); |
| |
| #endif /* _LINUX_CPU_H_ */ |