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 extern void cpu_init(void); 34 extern void trap_init(void); 35 36 extern int register_cpu(struct cpu *cpu, int num); 37 extern struct device *get_cpu_device(unsigned cpu); 38 extern bool cpu_is_hotpluggable(unsigned cpu); 39 extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id); 40 extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun, 41 int cpu, unsigned int *thread); 42 43 extern int cpu_add_dev_attr(struct device_attribute *attr); 44 extern void cpu_remove_dev_attr(struct device_attribute *attr); 45 46 extern int cpu_add_dev_attr_group(struct attribute_group *attrs); 47 extern void cpu_remove_dev_attr_group(struct attribute_group *attrs); 48 49 extern __printf(4, 5) 50 struct device *cpu_device_create(struct device *parent, void *drvdata, 51 const struct attribute_group **groups, 52 const char *fmt, ...); 53 #ifdef CONFIG_HOTPLUG_CPU 54 extern void unregister_cpu(struct cpu *cpu); 55 extern ssize_t arch_cpu_probe(const char *, size_t); 56 extern ssize_t arch_cpu_release(const char *, size_t); 57 #endif 58 struct notifier_block; 59 60 #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ 61 #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ 62 #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ 63 #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug 64 * lock is dropped */ 65 #define CPU_BROKEN 0x000B /* CPU (unsigned)v did not die properly, 66 * perhaps due to preemption. */ 67 68 /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend 69 * operation in progress 70 */ 71 #define CPU_TASKS_FROZEN 0x0010 72 73 #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN) 74 #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN) 75 #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN) 76 #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) 77 #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) 78 #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) 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