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TOMOYO Linux Cross Reference
Linux/include/linux/cpu.h

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  1 /*
  2  * include/linux/cpu.h - generic cpu definition
  3  *
  4  * This is mainly for topological representation. We define the 
  5  * basic 'struct cpu' here, which can be embedded in per-arch 
  6  * definitions of processors.
  7  *
  8  * Basic handling of the devices is done in drivers/base/cpu.c
  9  *
 10  * CPUs are exported via sysfs in the devices/system/cpu
 11  * directory. 
 12  */
 13 #ifndef _LINUX_CPU_H_
 14 #define _LINUX_CPU_H_
 15 
 16 #include <linux/node.h>
 17 #include <linux/compiler.h>
 18 #include <linux/cpumask.h>
 19 #include <linux/cpuhotplug.h>
 20 
 21 struct device;
 22 struct device_node;
 23 struct attribute_group;
 24 
 25 struct cpu {
 26         int node_id;            /* The node which contains the CPU */
 27         int hotpluggable;       /* creates sysfs control file if hotpluggable */
 28         struct device dev;
 29 };
 30 
 31 extern void boot_cpu_init(void);
 32 extern void boot_cpu_state_init(void);
 33 
 34 extern int register_cpu(struct cpu *cpu, int num);
 35 extern struct device *get_cpu_device(unsigned cpu);
 36 extern bool cpu_is_hotpluggable(unsigned cpu);
 37 extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
 38 extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
 39                                               int cpu, unsigned int *thread);
 40 
 41 extern int cpu_add_dev_attr(struct device_attribute *attr);
 42 extern void cpu_remove_dev_attr(struct device_attribute *attr);
 43 
 44 extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
 45 extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
 46 
 47 extern __printf(4, 5)
 48 struct device *cpu_device_create(struct device *parent, void *drvdata,
 49                                  const struct attribute_group **groups,
 50                                  const char *fmt, ...);
 51 #ifdef CONFIG_HOTPLUG_CPU
 52 extern void unregister_cpu(struct cpu *cpu);
 53 extern ssize_t arch_cpu_probe(const char *, size_t);
 54 extern ssize_t arch_cpu_release(const char *, size_t);
 55 #endif
 56 struct notifier_block;
 57 
 58 #define CPU_ONLINE              0x0002 /* CPU (unsigned)v is up */
 59 #define CPU_UP_PREPARE          0x0003 /* CPU (unsigned)v coming up */
 60 #define CPU_DEAD                0x0007 /* CPU (unsigned)v dead */
 61 #define CPU_POST_DEAD           0x0009 /* CPU (unsigned)v dead, cpu_hotplug
 62                                         * lock is dropped */
 63 #define CPU_BROKEN              0x000B /* CPU (unsigned)v did not die properly,
 64                                         * perhaps due to preemption. */
 65 
 66 /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
 67  * operation in progress
 68  */
 69 #define CPU_TASKS_FROZEN        0x0010
 70 
 71 #define CPU_ONLINE_FROZEN       (CPU_ONLINE | CPU_TASKS_FROZEN)
 72 #define CPU_UP_PREPARE_FROZEN   (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
 73 #define CPU_UP_CANCELED_FROZEN  (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
 74 #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
 75 #define CPU_DOWN_FAILED_FROZEN  (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
 76 #define CPU_DEAD_FROZEN         (CPU_DEAD | CPU_TASKS_FROZEN)
 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 /* Stop CPUs going up and down. */
101 
102 extern void cpu_hotplug_begin(void);
103 extern void cpu_hotplug_done(void);
104 extern void get_online_cpus(void);
105 extern void put_online_cpus(void);
106 extern void cpu_hotplug_disable(void);
107 extern void cpu_hotplug_enable(void);
108 void clear_tasks_mm_cpumask(int cpu);
109 int cpu_down(unsigned int cpu);
110 
111 #else           /* CONFIG_HOTPLUG_CPU */
112 
113 static inline void cpu_hotplug_begin(void) {}
114 static inline void cpu_hotplug_done(void) {}
115 #define get_online_cpus()       do { } while (0)
116 #define put_online_cpus()       do { } while (0)
117 #define cpu_hotplug_disable()   do { } while (0)
118 #define cpu_hotplug_enable()    do { } while (0)
119 #endif          /* CONFIG_HOTPLUG_CPU */
120 
121 #ifdef CONFIG_PM_SLEEP_SMP
122 extern int freeze_secondary_cpus(int primary);
123 static inline int disable_nonboot_cpus(void)
124 {
125         return freeze_secondary_cpus(0);
126 }
127 extern void enable_nonboot_cpus(void);
128 #else /* !CONFIG_PM_SLEEP_SMP */
129 static inline int disable_nonboot_cpus(void) { return 0; }
130 static inline void enable_nonboot_cpus(void) {}
131 #endif /* !CONFIG_PM_SLEEP_SMP */
132 
133 void cpu_startup_entry(enum cpuhp_state state);
134 
135 void cpu_idle_poll_ctrl(bool enable);
136 
137 /* Attach to any functions which should be considered cpuidle. */
138 #define __cpuidle       __attribute__((__section__(".cpuidle.text")))
139 
140 bool cpu_in_idle(unsigned long pc);
141 
142 void arch_cpu_idle(void);
143 void arch_cpu_idle_prepare(void);
144 void arch_cpu_idle_enter(void);
145 void arch_cpu_idle_exit(void);
146 void arch_cpu_idle_dead(void);
147 
148 int cpu_report_state(int cpu);
149 int cpu_check_up_prepare(int cpu);
150 void cpu_set_state_online(int cpu);
151 void play_idle(unsigned long duration_ms);
152 
153 #ifdef CONFIG_HOTPLUG_CPU
154 bool cpu_wait_death(unsigned int cpu, int seconds);
155 bool cpu_report_death(void);
156 void cpuhp_report_idle_dead(void);
157 #else
158 static inline void cpuhp_report_idle_dead(void) { }
159 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
160 
161 #endif /* _LINUX_CPU_H_ */
162 

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