| 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 | * and system devices are handled in drivers/base/sys.c. |
| 10 | * |
| 11 | * CPUs are exported via sysfs in the class/cpu/devices/ |
| 12 | * directory. |
| 13 | * |
| 14 | * Per-cpu interfaces can be implemented using a struct device_interface. |
| 15 | * See the following for how to do this: |
| 16 | * - drivers/base/intf.c |
| 17 | * - Documentation/driver-model/interface.txt |
| 18 | */ |
| 19 | #ifndef _LINUX_CPU_H_ |
| 20 | #define _LINUX_CPU_H_ |
| 21 | |
| 22 | #include <linux/sysdev.h> |
| 23 | #include <linux/node.h> |
| 24 | #include <linux/compiler.h> |
| 25 | #include <linux/cpumask.h> |
| 26 | #include <asm/semaphore.h> |
| 27 | #include <linux/mutex.h> |
| 28 | |
| 29 | struct cpu { |
| 30 | int node_id; /* The node which contains the CPU */ |
| 31 | int hotpluggable; /* creates sysfs control file if hotpluggable */ |
| 32 | struct sys_device sysdev; |
| 33 | }; |
| 34 | |
| 35 | extern int register_cpu(struct cpu *cpu, int num); |
| 36 | extern struct sys_device *get_cpu_sysdev(unsigned cpu); |
| 37 | |
| 38 | extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr); |
| 39 | extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr); |
| 40 | |
| 41 | extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs); |
| 42 | extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs); |
| 43 | |
| 44 | extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls); |
| 45 | |
| 46 | #ifdef CONFIG_HOTPLUG_CPU |
| 47 | extern void unregister_cpu(struct cpu *cpu); |
| 48 | #endif |
| 49 | struct notifier_block; |
| 50 | |
| 51 | #ifdef CONFIG_SMP |
| 52 | /* Need to know about CPUs going up/down? */ |
| 53 | #ifdef CONFIG_HOTPLUG_CPU |
| 54 | extern int register_cpu_notifier(struct notifier_block *nb); |
| 55 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
| 56 | #else |
| 57 | |
| 58 | #ifndef MODULE |
| 59 | extern int register_cpu_notifier(struct notifier_block *nb); |
| 60 | #else |
| 61 | static inline int register_cpu_notifier(struct notifier_block *nb) |
| 62 | { |
| 63 | return 0; |
| 64 | } |
| 65 | #endif |
| 66 | |
| 67 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
| 68 | { |
| 69 | } |
| 70 | #endif |
| 71 | |
| 72 | int cpu_up(unsigned int cpu); |
| 73 | |
| 74 | extern void cpu_hotplug_init(void); |
| 75 | |
| 76 | #else |
| 77 | |
| 78 | static inline int register_cpu_notifier(struct notifier_block *nb) |
| 79 | { |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
| 84 | { |
| 85 | } |
| 86 | |
| 87 | static inline void cpu_hotplug_init(void) |
| 88 | { |
| 89 | } |
| 90 | |
| 91 | #endif /* CONFIG_SMP */ |
| 92 | extern struct sysdev_class cpu_sysdev_class; |
| 93 | extern void cpu_maps_update_begin(void); |
| 94 | extern void cpu_maps_update_done(void); |
| 95 | |
| 96 | #ifdef CONFIG_HOTPLUG_CPU |
| 97 | /* Stop CPUs going up and down. */ |
| 98 | |
| 99 | static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex) |
| 100 | { |
| 101 | mutex_lock(cpu_hp_mutex); |
| 102 | } |
| 103 | |
| 104 | static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex) |
| 105 | { |
| 106 | mutex_unlock(cpu_hp_mutex); |
| 107 | } |
| 108 | |
| 109 | extern void get_online_cpus(void); |
| 110 | extern void put_online_cpus(void); |
| 111 | #define hotcpu_notifier(fn, pri) { \ |
| 112 | static struct notifier_block fn##_nb = \ |
| 113 | { .notifier_call = fn, .priority = pri }; \ |
| 114 | register_cpu_notifier(&fn##_nb); \ |
| 115 | } |
| 116 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
| 117 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) |
| 118 | int cpu_down(unsigned int cpu); |
| 119 | |
| 120 | #else /* CONFIG_HOTPLUG_CPU */ |
| 121 | |
| 122 | static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex) |
| 123 | { } |
| 124 | static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex) |
| 125 | { } |
| 126 | |
| 127 | #define get_online_cpus() do { } while (0) |
| 128 | #define put_online_cpus() do { } while (0) |
| 129 | #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
| 130 | /* These aren't inline functions due to a GCC bug. */ |
| 131 | #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) |
| 132 | #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) |
| 133 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 134 | |
| 135 | #ifdef CONFIG_PM_SLEEP_SMP |
| 136 | extern int suspend_cpu_hotplug; |
| 137 | |
| 138 | extern int disable_nonboot_cpus(void); |
| 139 | extern void enable_nonboot_cpus(void); |
| 140 | #else /* !CONFIG_PM_SLEEP_SMP */ |
| 141 | #define suspend_cpu_hotplug 0 |
| 142 | |
| 143 | static inline int disable_nonboot_cpus(void) { return 0; } |
| 144 | static inline void enable_nonboot_cpus(void) {} |
| 145 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
| 146 | |
| 147 | #endif /* _LINUX_CPU_H_ */ |