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Release 4.15 include/linux/cpu.h

Directory: include/linux
/* 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_state_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 __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 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 cpuhp_tasks_frozen	0


static inline void cpu_maps_update_begin(void) { }

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static inline void cpu_maps_update_done(void) { }

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#endif /* CONFIG_SMP */ extern struct bus_type cpu_subsys; #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 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 cpu_down(unsigned int cpu); #else /* CONFIG_HOTPLUG_CPU */
static inline void cpus_write_lock(void) { }

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Thomas Gleixner225.00%150.00%
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static inline void cpus_write_unlock(void) { }

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Thomas Gleixner225.00%150.00%
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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 */ /* Wrappers which go away once all code is converted */
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 extern int freeze_secondary_cpus(int primary);
static inline int disable_nonboot_cpus(void) { return freeze_secondary_cpus(0); }

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extern void enable_nonboot_cpus(void); #else /* !CONFIG_PM_SLEEP_SMP */
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 */ 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 __attribute__((__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(unsigned long duration_ms); #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) { }

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#endif /* #ifdef CONFIG_HOTPLUG_CPU */ #endif /* _LINUX_CPU_H_ */

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Thomas Gleixner25633.42%1120.37%
Paul E. McKenney476.14%11.85%
Rafael J. Wysocki415.35%23.70%
Christian Krafft344.44%11.85%
Andrew Morton334.31%47.41%
Sudeep Holla324.18%11.85%
Rusty Russell314.05%47.41%
Oleg Nesterov293.79%11.85%
Toshi Kani243.13%11.85%
Nathan Fontenot222.87%11.85%
David S. Miller212.74%11.85%
Ashok Raj202.61%35.56%
James Morse182.35%11.85%
Srivatsa S. Bhat162.09%11.85%
Ingo Molnar162.09%23.70%
Américo Wang162.09%11.85%
Len Brown141.83%11.85%
Chris Metcalf131.70%11.85%
Kay Sievers121.57%11.85%
Sudeep KarkadaNagesha111.44%11.85%
Patrick Mochel91.17%11.85%
Manfred Spraul81.04%11.85%
Peter Zijlstra81.04%11.85%
Josh Triplett81.04%11.85%
Anton Vorontsov70.91%11.85%
Nicolas Iooss40.52%11.85%
Jonathan Corbet30.39%11.85%
Kamezawa Hiroyuki30.39%11.85%
Paul Gortmaker30.39%11.85%
Suresh B. Siddha20.26%11.85%
Ralf Bächle20.26%11.85%
Greg Kroah-Hartman10.13%11.85%
Robert P. J. Day10.13%11.85%
Gautham R. Shenoy10.13%11.85%
Total766100.00%54100.00%
Directory: include/linux
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