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Linux/include/linux/cpu.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * include/linux/cpu.h - generic cpu definition
  4  *
  5  * This is mainly for topological representation. We define the 
  6  * basic 'struct cpu' here, which can be embedded in per-arch 
  7  * definitions of processors.
  8  *
  9  * Basic handling of the devices is done in drivers/base/cpu.c
 10  *
 11  * CPUs are exported via sysfs in the devices/system/cpu
 12  * directory. 
 13  */
 14 #ifndef _LINUX_CPU_H_
 15 #define _LINUX_CPU_H_
 16 
 17 #include <linux/node.h>
 18 #include <linux/compiler.h>
 19 #include <linux/cpumask.h>
 20 #include <linux/cpuhotplug.h>
 21 
 22 struct device;
 23 struct device_node;
 24 struct attribute_group;
 25 
 26 struct cpu {
 27         int node_id;            /* The node which contains the CPU */
 28         int hotpluggable;       /* creates sysfs control file if hotpluggable */
 29         struct device dev;
 30 };
 31 
 32 extern void boot_cpu_init(void);
 33 extern void boot_cpu_state_init(void);
 34 extern void cpu_init(void);
 35 extern void trap_init(void);
 36 
 37 extern int register_cpu(struct cpu *cpu, int num);
 38 extern struct device *get_cpu_device(unsigned cpu);
 39 extern bool cpu_is_hotpluggable(unsigned cpu);
 40 extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
 41 extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
 42                                               int cpu, unsigned int *thread);
 43 
 44 extern int cpu_add_dev_attr(struct device_attribute *attr);
 45 extern void cpu_remove_dev_attr(struct device_attribute *attr);
 46 
 47 extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
 48 extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
 49 
 50 extern ssize_t cpu_show_meltdown(struct device *dev,
 51                                  struct device_attribute *attr, char *buf);
 52 extern ssize_t cpu_show_spectre_v1(struct device *dev,
 53                                    struct device_attribute *attr, char *buf);
 54 extern ssize_t cpu_show_spectre_v2(struct device *dev,
 55                                    struct device_attribute *attr, char *buf);
 56 
 57 extern __printf(4, 5)
 58 struct device *cpu_device_create(struct device *parent, void *drvdata,
 59                                  const struct attribute_group **groups,
 60                                  const char *fmt, ...);
 61 #ifdef CONFIG_HOTPLUG_CPU
 62 extern void unregister_cpu(struct cpu *cpu);
 63 extern ssize_t arch_cpu_probe(const char *, size_t);
 64 extern ssize_t arch_cpu_release(const char *, size_t);
 65 #endif
 66 
 67 /*
 68  * These states are not related to the core CPU hotplug mechanism. They are
 69  * used by various (sub)architectures to track internal state
 70  */
 71 #define CPU_ONLINE              0x0002 /* CPU is up */
 72 #define CPU_UP_PREPARE          0x0003 /* CPU coming up */
 73 #define CPU_DEAD                0x0007 /* CPU dead */
 74 #define CPU_DEAD_FROZEN         0x0008 /* CPU timed out on unplug */
 75 #define CPU_POST_DEAD           0x0009 /* CPU successfully unplugged */
 76 #define CPU_BROKEN              0x000B /* CPU did not die properly */
 77 
 78 #ifdef CONFIG_SMP
 79 extern bool cpuhp_tasks_frozen;
 80 int cpu_up(unsigned int cpu);
 81 void notify_cpu_starting(unsigned int cpu);
 82 extern void cpu_maps_update_begin(void);
 83 extern void cpu_maps_update_done(void);
 84 
 85 #else   /* CONFIG_SMP */
 86 #define cpuhp_tasks_frozen      0
 87 
 88 static inline void cpu_maps_update_begin(void)
 89 {
 90 }
 91 
 92 static inline void cpu_maps_update_done(void)
 93 {
 94 }
 95 
 96 #endif /* CONFIG_SMP */
 97 extern struct bus_type cpu_subsys;
 98 
 99 #ifdef CONFIG_HOTPLUG_CPU
100 extern void cpus_write_lock(void);
101 extern void cpus_write_unlock(void);
102 extern void cpus_read_lock(void);
103 extern void cpus_read_unlock(void);
104 extern void lockdep_assert_cpus_held(void);
105 extern void cpu_hotplug_disable(void);
106 extern void cpu_hotplug_enable(void);
107 void clear_tasks_mm_cpumask(int cpu);
108 int cpu_down(unsigned int cpu);
109 
110 #else /* CONFIG_HOTPLUG_CPU */
111 
112 static inline void cpus_write_lock(void) { }
113 static inline void cpus_write_unlock(void) { }
114 static inline void cpus_read_lock(void) { }
115 static inline void cpus_read_unlock(void) { }
116 static inline void lockdep_assert_cpus_held(void) { }
117 static inline void cpu_hotplug_disable(void) { }
118 static inline void cpu_hotplug_enable(void) { }
119 #endif  /* !CONFIG_HOTPLUG_CPU */
120 
121 /* Wrappers which go away once all code is converted */
122 static inline void cpu_hotplug_begin(void) { cpus_write_lock(); }
123 static inline void cpu_hotplug_done(void) { cpus_write_unlock(); }
124 static inline void get_online_cpus(void) { cpus_read_lock(); }
125 static inline void put_online_cpus(void) { cpus_read_unlock(); }
126 
127 #ifdef CONFIG_PM_SLEEP_SMP
128 extern int freeze_secondary_cpus(int primary);
129 static inline int disable_nonboot_cpus(void)
130 {
131         return freeze_secondary_cpus(0);
132 }
133 extern void enable_nonboot_cpus(void);
134 #else /* !CONFIG_PM_SLEEP_SMP */
135 static inline int disable_nonboot_cpus(void) { return 0; }
136 static inline void enable_nonboot_cpus(void) {}
137 #endif /* !CONFIG_PM_SLEEP_SMP */
138 
139 void cpu_startup_entry(enum cpuhp_state state);
140 
141 void cpu_idle_poll_ctrl(bool enable);
142 
143 /* Attach to any functions which should be considered cpuidle. */
144 #define __cpuidle       __attribute__((__section__(".cpuidle.text")))
145 
146 bool cpu_in_idle(unsigned long pc);
147 
148 void arch_cpu_idle(void);
149 void arch_cpu_idle_prepare(void);
150 void arch_cpu_idle_enter(void);
151 void arch_cpu_idle_exit(void);
152 void arch_cpu_idle_dead(void);
153 
154 int cpu_report_state(int cpu);
155 int cpu_check_up_prepare(int cpu);
156 void cpu_set_state_online(int cpu);
157 void play_idle(unsigned long duration_ms);
158 
159 #ifdef CONFIG_HOTPLUG_CPU
160 bool cpu_wait_death(unsigned int cpu, int seconds);
161 bool cpu_report_death(void);
162 void cpuhp_report_idle_dead(void);
163 #else
164 static inline void cpuhp_report_idle_dead(void) { }
165 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
166 
167 #endif /* _LINUX_CPU_H_ */
168 

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