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232 lines
7.4 KiB
232 lines
7.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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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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#include <linux/cpuhotplug.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 void boot_cpu_init(void); |
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extern void boot_cpu_hotplug_init(void); |
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extern void cpu_init(void); |
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extern void trap_init(void); |
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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 ssize_t cpu_show_meltdown(struct device *dev, |
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struct device_attribute *attr, char *buf); |
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extern ssize_t cpu_show_spectre_v1(struct device *dev, |
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struct device_attribute *attr, char *buf); |
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extern ssize_t cpu_show_spectre_v2(struct device *dev, |
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struct device_attribute *attr, char *buf); |
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extern ssize_t cpu_show_spec_store_bypass(struct device *dev, |
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struct device_attribute *attr, char *buf); |
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extern ssize_t cpu_show_l1tf(struct device *dev, |
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struct device_attribute *attr, char *buf); |
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extern ssize_t cpu_show_mds(struct device *dev, |
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struct device_attribute *attr, char *buf); |
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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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#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_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug |
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* lock is dropped */ |
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#define CPU_BROKEN 0x000B /* 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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#ifdef CONFIG_SMP |
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extern bool cpuhp_tasks_frozen; |
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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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#else /* CONFIG_SMP */ |
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#define cpuhp_tasks_frozen 0 |
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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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#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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extern void cpus_write_lock(void); |
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extern void cpus_write_unlock(void); |
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extern void cpus_read_lock(void); |
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extern void cpus_read_unlock(void); |
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extern void lockdep_assert_cpus_held(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 register_hotcpu_notifier(nb) register_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 cpus_write_lock(void) { } |
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static inline void cpus_write_unlock(void) { } |
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static inline void cpus_read_lock(void) { } |
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static inline void cpus_read_unlock(void) { } |
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static inline void lockdep_assert_cpus_held(void) { } |
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static inline void cpu_hotplug_disable(void) { } |
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static inline void cpu_hotplug_enable(void) { } |
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#endif /* !CONFIG_HOTPLUG_CPU */ |
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/* Wrappers which go away once all code is converted */ |
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static inline void cpu_hotplug_begin(void) { cpus_write_lock(); } |
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static inline void cpu_hotplug_done(void) { cpus_write_unlock(); } |
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static inline void get_online_cpus(void) { cpus_read_lock(); } |
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static inline void put_online_cpus(void) { cpus_read_unlock(); } |
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#ifdef CONFIG_PM_SLEEP_SMP |
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extern int freeze_secondary_cpus(int primary); |
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static inline int disable_nonboot_cpus(void) |
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{ |
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return freeze_secondary_cpus(0); |
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} |
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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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void cpu_startup_entry(enum cpuhp_state state); |
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void cpu_idle_poll_ctrl(bool enable); |
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/* Attach to any functions which should be considered cpuidle. */ |
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#define __cpuidle __attribute__((__section__(".cpuidle.text"))) |
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bool cpu_in_idle(unsigned long pc); |
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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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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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void play_idle(unsigned long duration_ms); |
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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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void cpuhp_report_idle_dead(void); |
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#else |
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static inline void cpuhp_report_idle_dead(void) { } |
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#endif /* #ifdef CONFIG_HOTPLUG_CPU */ |
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enum cpuhp_smt_control { |
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CPU_SMT_ENABLED, |
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CPU_SMT_DISABLED, |
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CPU_SMT_FORCE_DISABLED, |
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CPU_SMT_NOT_SUPPORTED, |
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}; |
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#if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT) |
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extern enum cpuhp_smt_control cpu_smt_control; |
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extern void cpu_smt_disable(bool force); |
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extern void cpu_smt_check_topology(void); |
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extern int cpuhp_smt_enable(void); |
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extern int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval); |
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#else |
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# define cpu_smt_control (CPU_SMT_ENABLED) |
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static inline void cpu_smt_disable(bool force) { } |
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static inline void cpu_smt_check_topology(void) { } |
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static inline int cpuhp_smt_enable(void) { return 0; } |
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static inline int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) { return 0; } |
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#endif |
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/* |
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* These are used for a global "mitigations=" cmdline option for toggling |
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* optional CPU mitigations. |
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*/ |
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enum cpu_mitigations { |
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CPU_MITIGATIONS_OFF, |
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CPU_MITIGATIONS_AUTO, |
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CPU_MITIGATIONS_AUTO_NOSMT, |
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}; |
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extern enum cpu_mitigations cpu_mitigations; |
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/* mitigations=off */ |
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static inline bool cpu_mitigations_off(void) |
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{ |
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return cpu_mitigations == CPU_MITIGATIONS_OFF; |
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} |
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/* mitigations=auto,nosmt */ |
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static inline bool cpu_mitigations_auto_nosmt(void) |
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{ |
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return cpu_mitigations == CPU_MITIGATIONS_AUTO_NOSMT; |
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} |
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#endif /* _LINUX_CPU_H_ */
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