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TOMOYO Linux Cross Reference
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 extern ssize_t cpu_show_spec_store_bypass(struct device *dev,
 57                                           struct device_attribute *attr, char *buf);
 58 
 59 extern __printf(4, 5)
 60 struct device *cpu_device_create(struct device *parent, void *drvdata,
 61                                  const struct attribute_group **groups,
 62                                  const char *fmt, ...);
 63 #ifdef CONFIG_HOTPLUG_CPU
 64 extern void unregister_cpu(struct cpu *cpu);
 65 extern ssize_t arch_cpu_probe(const char *, size_t);
 66 extern ssize_t arch_cpu_release(const char *, size_t);
 67 #endif
 68 
 69 /*
 70  * These states are not related to the core CPU hotplug mechanism. They are
 71  * used by various (sub)architectures to track internal state
 72  */
 73 #define CPU_ONLINE              0x0002 /* CPU is up */
 74 #define CPU_UP_PREPARE          0x0003 /* CPU coming up */
 75 #define CPU_DEAD                0x0007 /* CPU dead */
 76 #define CPU_DEAD_FROZEN         0x0008 /* CPU timed out on unplug */
 77 #define CPU_POST_DEAD           0x0009 /* CPU successfully unplugged */
 78 #define CPU_BROKEN              0x000B /* CPU did not die properly */
 79 
 80 #ifdef CONFIG_SMP
 81 extern bool cpuhp_tasks_frozen;
 82 int cpu_up(unsigned int cpu);
 83 void notify_cpu_starting(unsigned int cpu);
 84 extern void cpu_maps_update_begin(void);
 85 extern void cpu_maps_update_done(void);
 86 
 87 #else   /* CONFIG_SMP */
 88 #define cpuhp_tasks_frozen      0
 89 
 90 static inline void cpu_maps_update_begin(void)
 91 {
 92 }
 93 
 94 static inline void cpu_maps_update_done(void)
 95 {
 96 }
 97 
 98 #endif /* CONFIG_SMP */
 99 extern struct bus_type cpu_subsys;
100 
101 #ifdef CONFIG_HOTPLUG_CPU
102 extern void cpus_write_lock(void);
103 extern void cpus_write_unlock(void);
104 extern void cpus_read_lock(void);
105 extern void cpus_read_unlock(void);
106 extern void lockdep_assert_cpus_held(void);
107 extern void cpu_hotplug_disable(void);
108 extern void cpu_hotplug_enable(void);
109 void clear_tasks_mm_cpumask(int cpu);
110 int cpu_down(unsigned int cpu);
111 
112 #else /* CONFIG_HOTPLUG_CPU */
113 
114 static inline void cpus_write_lock(void) { }
115 static inline void cpus_write_unlock(void) { }
116 static inline void cpus_read_lock(void) { }
117 static inline void cpus_read_unlock(void) { }
118 static inline void lockdep_assert_cpus_held(void) { }
119 static inline void cpu_hotplug_disable(void) { }
120 static inline void cpu_hotplug_enable(void) { }
121 #endif  /* !CONFIG_HOTPLUG_CPU */
122 
123 /* Wrappers which go away once all code is converted */
124 static inline void cpu_hotplug_begin(void) { cpus_write_lock(); }
125 static inline void cpu_hotplug_done(void) { cpus_write_unlock(); }
126 static inline void get_online_cpus(void) { cpus_read_lock(); }
127 static inline void put_online_cpus(void) { cpus_read_unlock(); }
128 
129 #ifdef CONFIG_PM_SLEEP_SMP
130 extern int freeze_secondary_cpus(int primary);
131 static inline int disable_nonboot_cpus(void)
132 {
133         return freeze_secondary_cpus(0);
134 }
135 extern void enable_nonboot_cpus(void);
136 #else /* !CONFIG_PM_SLEEP_SMP */
137 static inline int disable_nonboot_cpus(void) { return 0; }
138 static inline void enable_nonboot_cpus(void) {}
139 #endif /* !CONFIG_PM_SLEEP_SMP */
140 
141 void cpu_startup_entry(enum cpuhp_state state);
142 
143 void cpu_idle_poll_ctrl(bool enable);
144 
145 /* Attach to any functions which should be considered cpuidle. */
146 #define __cpuidle       __attribute__((__section__(".cpuidle.text")))
147 
148 bool cpu_in_idle(unsigned long pc);
149 
150 void arch_cpu_idle(void);
151 void arch_cpu_idle_prepare(void);
152 void arch_cpu_idle_enter(void);
153 void arch_cpu_idle_exit(void);
154 void arch_cpu_idle_dead(void);
155 
156 int cpu_report_state(int cpu);
157 int cpu_check_up_prepare(int cpu);
158 void cpu_set_state_online(int cpu);
159 void play_idle(unsigned long duration_ms);
160 
161 #ifdef CONFIG_HOTPLUG_CPU
162 bool cpu_wait_death(unsigned int cpu, int seconds);
163 bool cpu_report_death(void);
164 void cpuhp_report_idle_dead(void);
165 #else
166 static inline void cpuhp_report_idle_dead(void) { }
167 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
168 
169 #endif /* _LINUX_CPU_H_ */
170 

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