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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | /* * include/linux/cpu.h - generic cpu definition * * This is mainly for topological representation. We define the * basic 'struct cpu' here, which can be embedded in per-arch * definitions of processors. * * Basic handling of the devices is done in drivers/base/cpu.c * and system devices are handled in drivers/base/sys.c. * * CPUs are exported via sysfs in the class/cpu/devices/ * directory. */ #ifndef _LINUX_CPU_H_ #define _LINUX_CPU_H_ #include <linux/node.h> #include <linux/compiler.h> #include <linux/cpumask.h> struct device; struct cpu { int node_id; /* The node which contains the CPU */ int hotpluggable; /* creates sysfs control file if hotpluggable */ struct device dev; }; extern int register_cpu(struct cpu *cpu, int num); extern struct device *get_cpu_device(unsigned cpu); extern bool cpu_is_hotpluggable(unsigned cpu); extern int cpu_add_dev_attr(struct device_attribute *attr); extern void cpu_remove_dev_attr(struct device_attribute *attr); extern int cpu_add_dev_attr_group(struct attribute_group *attrs); extern void cpu_remove_dev_attr_group(struct attribute_group *attrs); #ifdef CONFIG_HOTPLUG_CPU extern void unregister_cpu(struct cpu *cpu); extern ssize_t arch_cpu_probe(const char *, size_t); extern ssize_t arch_cpu_release(const char *, size_t); #endif struct notifier_block; #ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE extern int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env); extern ssize_t arch_print_cpu_modalias(struct device *dev, struct device_attribute *attr, char *bufptr); #endif /* * CPU notifier priorities. */ enum { /* * SCHED_ACTIVE marks a cpu which is coming up active during * CPU_ONLINE and CPU_DOWN_FAILED and must be the first * notifier. CPUSET_ACTIVE adjusts cpuset according to * cpu_active mask right after SCHED_ACTIVE. During * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are * ordered in the similar way. * * This ordering guarantees consistent cpu_active mask and * migration behavior to all cpu notifiers. */ CPU_PRI_SCHED_ACTIVE = INT_MAX, CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1, CPU_PRI_SCHED_INACTIVE = INT_MIN + 1, CPU_PRI_CPUSET_INACTIVE = INT_MIN, /* migration should happen before other stuff but after perf */ CPU_PRI_PERF = 20, CPU_PRI_MIGRATION = 10, /* bring up workqueues before normal notifiers and down after */ CPU_PRI_WORKQUEUE_UP = 5, CPU_PRI_WORKQUEUE_DOWN = -5, }; #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ #define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task, * not handling interrupts, soon dead. * Called on the dying cpu, interrupts * are already disabled. Must not * sleep, must not fail */ #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug * lock is dropped */ #define CPU_STARTING 0x000A /* CPU (unsigned)v soon running. * Called on the new cpu, just before * enabling interrupts. Must not sleep, * must not fail */ /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend * operation in progress */ #define CPU_TASKS_FROZEN 0x0010 #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN) #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN) #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN) #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) #define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN) #ifdef CONFIG_SMP /* Need to know about CPUs going up/down? */ #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) #define cpu_notifier(fn, pri) { \ static struct notifier_block fn##_nb __cpuinitdata = \ { .notifier_call = fn, .priority = pri }; \ register_cpu_notifier(&fn##_nb); \ } #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ #ifdef CONFIG_HOTPLUG_CPU extern int register_cpu_notifier(struct notifier_block *nb); extern void unregister_cpu_notifier(struct notifier_block *nb); #else #ifndef MODULE extern int register_cpu_notifier(struct notifier_block *nb); #else static inline int register_cpu_notifier(struct notifier_block *nb) { return 0; } #endif static inline void unregister_cpu_notifier(struct notifier_block *nb) { } #endif int cpu_up(unsigned int cpu); void notify_cpu_starting(unsigned int cpu); extern void cpu_maps_update_begin(void); extern void cpu_maps_update_done(void); #else /* CONFIG_SMP */ #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) static inline int register_cpu_notifier(struct notifier_block *nb) { return 0; } static inline void unregister_cpu_notifier(struct notifier_block *nb) { } static inline void cpu_maps_update_begin(void) { } static inline void cpu_maps_update_done(void) { } #endif /* CONFIG_SMP */ extern struct bus_type cpu_subsys; #ifdef CONFIG_HOTPLUG_CPU /* Stop CPUs going up and down. */ extern void get_online_cpus(void); extern void put_online_cpus(void); #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) void clear_tasks_mm_cpumask(int cpu); int cpu_down(unsigned int cpu); #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE extern void cpu_hotplug_driver_lock(void); extern void cpu_hotplug_driver_unlock(void); #else static inline void cpu_hotplug_driver_lock(void) { } static inline void cpu_hotplug_driver_unlock(void) { } #endif #else /* CONFIG_HOTPLUG_CPU */ #define get_online_cpus() do { } while (0) #define put_online_cpus() do { } while (0) #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) /* These aren't inline functions due to a GCC bug. */ #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) #endif /* CONFIG_HOTPLUG_CPU */ #ifdef CONFIG_PM_SLEEP_SMP extern int disable_nonboot_cpus(void); extern void enable_nonboot_cpus(void); #else /* !CONFIG_PM_SLEEP_SMP */ static inline int disable_nonboot_cpus(void) { return 0; } static inline void enable_nonboot_cpus(void) {} #endif /* !CONFIG_PM_SLEEP_SMP */ #endif /* _LINUX_CPU_H_ */ |