| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * 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 |
| * |
| * CPUs are exported via sysfs in the devices/system/cpu |
| * directory. |
| */ |
| #ifndef _LINUX_CPU_H_ |
| #define _LINUX_CPU_H_ |
| |
| #include <linux/node.h> |
| #include <linux/compiler.h> |
| #include <linux/cpumask.h> |
| #include <linux/cpuhotplug.h> |
| |
| struct device; |
| struct device_node; |
| struct attribute_group; |
| |
| struct cpu { |
| int node_id; /* The node which contains the CPU */ |
| int hotpluggable; /* creates sysfs control file if hotpluggable */ |
| struct device dev; |
| }; |
| |
| extern void boot_cpu_init(void); |
| extern void boot_cpu_hotplug_init(void); |
| extern void cpu_init(void); |
| extern void trap_init(void); |
| |
| 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 bool arch_match_cpu_phys_id(int cpu, u64 phys_id); |
| extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun, |
| int cpu, unsigned int *thread); |
| |
| 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 ssize_t cpu_show_meltdown(struct device *dev, |
| struct device_attribute *attr, char *buf); |
| extern ssize_t cpu_show_spectre_v1(struct device *dev, |
| struct device_attribute *attr, char *buf); |
| extern ssize_t cpu_show_spectre_v2(struct device *dev, |
| struct device_attribute *attr, char *buf); |
| extern ssize_t cpu_show_spec_store_bypass(struct device *dev, |
| struct device_attribute *attr, char *buf); |
| extern ssize_t cpu_show_l1tf(struct device *dev, |
| struct device_attribute *attr, char *buf); |
| extern ssize_t cpu_show_mds(struct device *dev, |
| struct device_attribute *attr, char *buf); |
| extern ssize_t cpu_show_tsx_async_abort(struct device *dev, |
| struct device_attribute *attr, |
| char *buf); |
| extern ssize_t cpu_show_itlb_multihit(struct device *dev, |
| struct device_attribute *attr, char *buf); |
| extern ssize_t cpu_show_srbds(struct device *dev, struct device_attribute *attr, char *buf); |
| |
| extern __printf(4, 5) |
| struct device *cpu_device_create(struct device *parent, void *drvdata, |
| const struct attribute_group **groups, |
| const char *fmt, ...); |
| #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 |
| |
| /* |
| * These states are not related to the core CPU hotplug mechanism. They are |
| * used by various (sub)architectures to track internal state |
| */ |
| #define CPU_ONLINE 0x0002 /* CPU is up */ |
| #define CPU_UP_PREPARE 0x0003 /* CPU coming up */ |
| #define CPU_DEAD 0x0007 /* CPU dead */ |
| #define CPU_DEAD_FROZEN 0x0008 /* CPU timed out on unplug */ |
| #define CPU_POST_DEAD 0x0009 /* CPU successfully unplugged */ |
| #define CPU_BROKEN 0x000B /* CPU did not die properly */ |
| |
| #ifdef CONFIG_SMP |
| extern bool cpuhp_tasks_frozen; |
| int add_cpu(unsigned int cpu); |
| int cpu_device_up(struct device *dev); |
| void notify_cpu_starting(unsigned int cpu); |
| extern void cpu_maps_update_begin(void); |
| extern void cpu_maps_update_done(void); |
| int bringup_hibernate_cpu(unsigned int sleep_cpu); |
| void bringup_nonboot_cpus(unsigned int setup_max_cpus); |
| |
| #else /* CONFIG_SMP */ |
| #define cpuhp_tasks_frozen 0 |
| |
| static inline void cpu_maps_update_begin(void) |
| { |
| } |
| |
| static inline void cpu_maps_update_done(void) |
| { |
| } |
| |
| static inline int add_cpu(unsigned int cpu) { return 0;} |
| |
| #endif /* CONFIG_SMP */ |
| extern struct bus_type cpu_subsys; |
| |
| extern int lockdep_is_cpus_held(void); |
| |
| #ifdef CONFIG_HOTPLUG_CPU |
| extern void cpus_write_lock(void); |
| extern void cpus_write_unlock(void); |
| extern void cpus_read_lock(void); |
| extern void cpus_read_unlock(void); |
| extern int cpus_read_trylock(void); |
| extern void lockdep_assert_cpus_held(void); |
| extern void cpu_hotplug_disable(void); |
| extern void cpu_hotplug_enable(void); |
| void clear_tasks_mm_cpumask(int cpu); |
| int remove_cpu(unsigned int cpu); |
| int cpu_device_down(struct device *dev); |
| extern void smp_shutdown_nonboot_cpus(unsigned int primary_cpu); |
| |
| #else /* CONFIG_HOTPLUG_CPU */ |
| |
| static inline void cpus_write_lock(void) { } |
| static inline void cpus_write_unlock(void) { } |
| static inline void cpus_read_lock(void) { } |
| static inline void cpus_read_unlock(void) { } |
| static inline int cpus_read_trylock(void) { return true; } |
| static inline void lockdep_assert_cpus_held(void) { } |
| static inline void cpu_hotplug_disable(void) { } |
| static inline void cpu_hotplug_enable(void) { } |
| static inline int remove_cpu(unsigned int cpu) { return -EPERM; } |
| static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { } |
| #endif /* !CONFIG_HOTPLUG_CPU */ |
| |
| #ifdef CONFIG_PM_SLEEP_SMP |
| extern int freeze_secondary_cpus(int primary); |
| extern void thaw_secondary_cpus(void); |
| |
| static inline int suspend_disable_secondary_cpus(void) |
| { |
| int cpu = 0; |
| |
| if (IS_ENABLED(CONFIG_PM_SLEEP_SMP_NONZERO_CPU)) |
| cpu = -1; |
| |
| return freeze_secondary_cpus(cpu); |
| } |
| static inline void suspend_enable_secondary_cpus(void) |
| { |
| return thaw_secondary_cpus(); |
| } |
| |
| #else /* !CONFIG_PM_SLEEP_SMP */ |
| static inline void thaw_secondary_cpus(void) {} |
| static inline int suspend_disable_secondary_cpus(void) { return 0; } |
| static inline void suspend_enable_secondary_cpus(void) { } |
| #endif /* !CONFIG_PM_SLEEP_SMP */ |
| |
| void cpu_startup_entry(enum cpuhp_state state); |
| |
| void cpu_idle_poll_ctrl(bool enable); |
| |
| /* Attach to any functions which should be considered cpuidle. */ |
| #define __cpuidle __section(".cpuidle.text") |
| |
| bool cpu_in_idle(unsigned long pc); |
| |
| void arch_cpu_idle(void); |
| void arch_cpu_idle_prepare(void); |
| void arch_cpu_idle_enter(void); |
| void arch_cpu_idle_exit(void); |
| void arch_cpu_idle_dead(void); |
| |
| int cpu_report_state(int cpu); |
| int cpu_check_up_prepare(int cpu); |
| void cpu_set_state_online(int cpu); |
| void play_idle_precise(u64 duration_ns, u64 latency_ns); |
| |
| static inline void play_idle(unsigned long duration_us) |
| { |
| play_idle_precise(duration_us * NSEC_PER_USEC, U64_MAX); |
| } |
| |
| #ifdef CONFIG_HOTPLUG_CPU |
| bool cpu_wait_death(unsigned int cpu, int seconds); |
| bool cpu_report_death(void); |
| void cpuhp_report_idle_dead(void); |
| #else |
| static inline void cpuhp_report_idle_dead(void) { } |
| #endif /* #ifdef CONFIG_HOTPLUG_CPU */ |
| |
| enum cpuhp_smt_control { |
| CPU_SMT_ENABLED, |
| CPU_SMT_DISABLED, |
| CPU_SMT_FORCE_DISABLED, |
| CPU_SMT_NOT_SUPPORTED, |
| CPU_SMT_NOT_IMPLEMENTED, |
| }; |
| |
| #if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT) |
| extern enum cpuhp_smt_control cpu_smt_control; |
| extern void cpu_smt_disable(bool force); |
| extern void cpu_smt_check_topology(void); |
| extern bool cpu_smt_possible(void); |
| extern int cpuhp_smt_enable(void); |
| extern int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval); |
| #else |
| # define cpu_smt_control (CPU_SMT_NOT_IMPLEMENTED) |
| static inline void cpu_smt_disable(bool force) { } |
| static inline void cpu_smt_check_topology(void) { } |
| static inline bool cpu_smt_possible(void) { return false; } |
| static inline int cpuhp_smt_enable(void) { return 0; } |
| static inline int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) { return 0; } |
| #endif |
| |
| extern bool cpu_mitigations_off(void); |
| extern bool cpu_mitigations_auto_nosmt(void); |
| |
| #endif /* _LINUX_CPU_H_ */ |