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293 lines
8.9 KiB
293 lines
8.9 KiB
/* |
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* include/linux/cpu.h - generic cpu definition |
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* |
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* This is mainly for topological representation. We define the |
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* basic 'struct cpu' here, which can be embedded in per-arch |
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* definitions of processors. |
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* |
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* Basic handling of the devices is done in drivers/base/cpu.c |
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* |
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* CPUs are exported via sysfs in the devices/system/cpu |
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* directory. |
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*/ |
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#ifndef _LINUX_CPU_H_ |
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#define _LINUX_CPU_H_ |
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#include <linux/node.h> |
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#include <linux/compiler.h> |
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#include <linux/cpumask.h> |
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struct device; |
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struct device_node; |
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struct attribute_group; |
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struct cpu { |
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int node_id; /* The node which contains the CPU */ |
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int hotpluggable; /* creates sysfs control file if hotpluggable */ |
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struct device dev; |
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}; |
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extern int register_cpu(struct cpu *cpu, int num); |
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extern struct device *get_cpu_device(unsigned cpu); |
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extern bool cpu_is_hotpluggable(unsigned cpu); |
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extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id); |
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extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun, |
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int cpu, unsigned int *thread); |
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extern int cpu_add_dev_attr(struct device_attribute *attr); |
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extern void cpu_remove_dev_attr(struct device_attribute *attr); |
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extern int cpu_add_dev_attr_group(struct attribute_group *attrs); |
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extern void cpu_remove_dev_attr_group(struct attribute_group *attrs); |
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extern __printf(4, 5) |
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struct device *cpu_device_create(struct device *parent, void *drvdata, |
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const struct attribute_group **groups, |
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const char *fmt, ...); |
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#ifdef CONFIG_HOTPLUG_CPU |
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extern void unregister_cpu(struct cpu *cpu); |
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extern ssize_t arch_cpu_probe(const char *, size_t); |
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extern ssize_t arch_cpu_release(const char *, size_t); |
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#endif |
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struct notifier_block; |
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/* |
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* CPU notifier priorities. |
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*/ |
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enum { |
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/* |
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* SCHED_ACTIVE marks a cpu which is coming up active during |
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* CPU_ONLINE and CPU_DOWN_FAILED and must be the first |
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* notifier. CPUSET_ACTIVE adjusts cpuset according to |
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* cpu_active mask right after SCHED_ACTIVE. During |
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* CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are |
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* ordered in the similar way. |
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* |
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* This ordering guarantees consistent cpu_active mask and |
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* migration behavior to all cpu notifiers. |
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*/ |
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CPU_PRI_SCHED_ACTIVE = INT_MAX, |
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CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1, |
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CPU_PRI_SCHED_INACTIVE = INT_MIN + 1, |
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CPU_PRI_CPUSET_INACTIVE = INT_MIN, |
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/* migration should happen before other stuff but after perf */ |
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CPU_PRI_PERF = 20, |
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CPU_PRI_MIGRATION = 10, |
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CPU_PRI_SMPBOOT = 9, |
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/* bring up workqueues before normal notifiers and down after */ |
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CPU_PRI_WORKQUEUE_UP = 5, |
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CPU_PRI_WORKQUEUE_DOWN = -5, |
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}; |
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#define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ |
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#define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ |
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#define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ |
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#define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ |
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#define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ |
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#define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ |
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#define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task, |
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* not handling interrupts, soon dead. |
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* Called on the dying cpu, interrupts |
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* are already disabled. Must not |
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* sleep, must not fail */ |
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#define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug |
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* lock is dropped */ |
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#define CPU_STARTING 0x000A /* CPU (unsigned)v soon running. |
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* Called on the new cpu, just before |
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* enabling interrupts. Must not sleep, |
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* must not fail */ |
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#define CPU_DYING_IDLE 0x000B /* CPU (unsigned)v dying, reached |
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* idle loop. */ |
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#define CPU_BROKEN 0x000C /* CPU (unsigned)v did not die properly, |
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* perhaps due to preemption. */ |
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/* Used for CPU hotplug events occurring while tasks are frozen due to a suspend |
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* operation in progress |
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*/ |
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#define CPU_TASKS_FROZEN 0x0010 |
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#define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN) |
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#define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN) |
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#define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN) |
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#define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) |
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#define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) |
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#define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) |
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#define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) |
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#define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN) |
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#ifdef CONFIG_SMP |
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/* Need to know about CPUs going up/down? */ |
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#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) |
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#define cpu_notifier(fn, pri) { \ |
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static struct notifier_block fn##_nb = \ |
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{ .notifier_call = fn, .priority = pri }; \ |
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register_cpu_notifier(&fn##_nb); \ |
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} |
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#define __cpu_notifier(fn, pri) { \ |
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static struct notifier_block fn##_nb = \ |
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{ .notifier_call = fn, .priority = pri }; \ |
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__register_cpu_notifier(&fn##_nb); \ |
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} |
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extern int register_cpu_notifier(struct notifier_block *nb); |
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extern int __register_cpu_notifier(struct notifier_block *nb); |
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extern void unregister_cpu_notifier(struct notifier_block *nb); |
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extern void __unregister_cpu_notifier(struct notifier_block *nb); |
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#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ |
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#define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
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#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
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static inline int register_cpu_notifier(struct notifier_block *nb) |
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{ |
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return 0; |
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} |
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static inline int __register_cpu_notifier(struct notifier_block *nb) |
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{ |
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return 0; |
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} |
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static inline void unregister_cpu_notifier(struct notifier_block *nb) |
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{ |
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} |
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static inline void __unregister_cpu_notifier(struct notifier_block *nb) |
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{ |
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} |
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#endif |
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void smpboot_thread_init(void); |
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int cpu_up(unsigned int cpu); |
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void notify_cpu_starting(unsigned int cpu); |
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extern void cpu_maps_update_begin(void); |
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extern void cpu_maps_update_done(void); |
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#define cpu_notifier_register_begin cpu_maps_update_begin |
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#define cpu_notifier_register_done cpu_maps_update_done |
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#else /* CONFIG_SMP */ |
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#define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
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#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
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static inline int register_cpu_notifier(struct notifier_block *nb) |
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{ |
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return 0; |
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} |
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static inline int __register_cpu_notifier(struct notifier_block *nb) |
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{ |
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return 0; |
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} |
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static inline void unregister_cpu_notifier(struct notifier_block *nb) |
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{ |
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} |
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static inline void __unregister_cpu_notifier(struct notifier_block *nb) |
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{ |
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} |
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static inline void cpu_maps_update_begin(void) |
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{ |
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} |
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static inline void cpu_maps_update_done(void) |
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{ |
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} |
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static inline void cpu_notifier_register_begin(void) |
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{ |
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} |
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static inline void cpu_notifier_register_done(void) |
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{ |
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} |
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static inline void smpboot_thread_init(void) |
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{ |
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} |
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#endif /* CONFIG_SMP */ |
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extern struct bus_type cpu_subsys; |
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#ifdef CONFIG_HOTPLUG_CPU |
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/* Stop CPUs going up and down. */ |
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extern void cpu_hotplug_begin(void); |
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extern void cpu_hotplug_done(void); |
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extern void get_online_cpus(void); |
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extern void put_online_cpus(void); |
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extern void cpu_hotplug_disable(void); |
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extern void cpu_hotplug_enable(void); |
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#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) |
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#define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri) |
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#define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
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#define __register_hotcpu_notifier(nb) __register_cpu_notifier(nb) |
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#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) |
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#define __unregister_hotcpu_notifier(nb) __unregister_cpu_notifier(nb) |
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void clear_tasks_mm_cpumask(int cpu); |
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int cpu_down(unsigned int cpu); |
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#else /* CONFIG_HOTPLUG_CPU */ |
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static inline void cpu_hotplug_begin(void) {} |
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static inline void cpu_hotplug_done(void) {} |
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#define get_online_cpus() do { } while (0) |
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#define put_online_cpus() do { } while (0) |
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#define cpu_hotplug_disable() do { } while (0) |
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#define cpu_hotplug_enable() do { } while (0) |
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#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
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#define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
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/* These aren't inline functions due to a GCC bug. */ |
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#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) |
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#define __register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) |
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#define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) |
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#define __unregister_hotcpu_notifier(nb) ({ (void)(nb); }) |
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#endif /* CONFIG_HOTPLUG_CPU */ |
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#ifdef CONFIG_PM_SLEEP_SMP |
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extern int disable_nonboot_cpus(void); |
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extern void enable_nonboot_cpus(void); |
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#else /* !CONFIG_PM_SLEEP_SMP */ |
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static inline int disable_nonboot_cpus(void) { return 0; } |
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static inline void enable_nonboot_cpus(void) {} |
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#endif /* !CONFIG_PM_SLEEP_SMP */ |
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enum cpuhp_state { |
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CPUHP_OFFLINE, |
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CPUHP_ONLINE, |
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}; |
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void cpu_startup_entry(enum cpuhp_state state); |
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void cpu_idle_poll_ctrl(bool enable); |
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void arch_cpu_idle(void); |
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void arch_cpu_idle_prepare(void); |
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void arch_cpu_idle_enter(void); |
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void arch_cpu_idle_exit(void); |
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void arch_cpu_idle_dead(void); |
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DECLARE_PER_CPU(bool, cpu_dead_idle); |
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int cpu_report_state(int cpu); |
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int cpu_check_up_prepare(int cpu); |
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void cpu_set_state_online(int cpu); |
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#ifdef CONFIG_HOTPLUG_CPU |
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bool cpu_wait_death(unsigned int cpu, int seconds); |
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bool cpu_report_death(void); |
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#endif /* #ifdef CONFIG_HOTPLUG_CPU */ |
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#define IDLE_START 1 |
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#define IDLE_END 2 |
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void idle_notifier_register(struct notifier_block *n); |
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void idle_notifier_unregister(struct notifier_block *n); |
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void idle_notifier_call_chain(unsigned long val); |
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#endif /* _LINUX_CPU_H_ */
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