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