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Diffstat (limited to 'include/linux/cpu.h')
| -rw-r--r-- | include/linux/cpu.h | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h new file mode 100644 index 000000000..008bfa68c --- /dev/null +++ b/include/linux/cpu.h @@ -0,0 +1,245 @@ +/* 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 ssize_t cpu_show_mmio_stale_data(struct device *dev, + struct device_attribute *attr, + char *buf); +extern ssize_t cpu_show_retbleed(struct device *dev, + struct device_attribute *attr, char *buf); +extern ssize_t cpu_show_spec_rstack_overflow(struct device *dev, + struct device_attribute *attr, char *buf); +extern ssize_t cpu_show_gds(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 __noreturn 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); + +#ifdef CONFIG_ARCH_HAS_CPU_FINALIZE_INIT +void arch_cpu_finalize_init(void); +#else +static inline void arch_cpu_finalize_init(void) { } +#endif + +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_ */ |