| 1 | |
| 2 | * include/linux/cpu.h - generic cpu definition
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| 3 | *
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| 4 | * This is mainly for topological representation. We define the
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| 5 | * basic 'struct cpu' here, which can be embedded in per-arch
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| 6 | * definitions of processors.
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| 7 | *
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| 8 | * Basic handling of the devices is done in drivers/base/cpu.c
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| 9 | * and system devices are handled in drivers/base/sys.c.
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| 10 | *
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| 11 | * CPUs are exported via driverfs in the class/cpu/devices/
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| 12 | * directory.
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| 13 | *
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| 14 | * Per-cpu interfaces can be implemented using a struct device_interface.
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| 15 | * See the following for how to do this:
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| 16 | * - drivers/base/intf.c
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| 17 | * - Documentation/driver-model/interface.txt
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| 18 |
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| 19 | #ifndef _LINUX_CPU_H_
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| 20 | #define _LINUX_CPU_H_
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| 21 |
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| 22 | #include <linux/sysdev.h>
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| 23 | #include <linux/node.h>
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| 24 | #include <linux/compiler.h>
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| 25 | #include <linux/cpumask.h>
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| 26 | #include <asm/semaphore.h>
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| 27 |
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| 28 | struct cpu {
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| 29 | int node_id;
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| 30 | int no_control;
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| 31 | struct sys_device sysdev;
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| 32 | };
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| 33 |
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| 34 | extern int register_cpu(struct cpu *, int, struct node *);
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| 35 | #ifdef CONFIG_HOTPLUG_CPU
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| 36 | extern void unregister_cpu(struct cpu *, struct node *);
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| 37 | #endif
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| 38 | struct notifier_block;
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| 39 |
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| 40 | #ifdef CONFIG_SMP
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| 41 |
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| 42 | extern int register_cpu_notifier(struct notifier_block *nb);
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| 43 | extern void unregister_cpu_notifier(struct notifier_block *nb);
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| 44 |
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| 45 | int cpu_up(unsigned int cpu);
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| 46 |
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| 47 | #else
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| 48 |
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| 49 | static inline int register_cpu_notifier(struct notifier_block *nb)
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| 50 | {
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| 51 | return 0;
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| 52 | }
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| 53 | static inline void unregister_cpu_notifier(struct notifier_block *nb)
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| 54 | {
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| 55 | }
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| 56 |
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| 57 | #endif
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| 58 | extern struct sysdev_class cpu_sysdev_class;
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| 59 |
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| 60 | #ifdef CONFIG_HOTPLUG_CPU
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| 61 |
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| 62 | extern struct semaphore cpucontrol;
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| 63 | #define lock_cpu_hotplug() down(&cpucontrol)
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| 64 | #define unlock_cpu_hotplug() up(&cpucontrol)
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| 65 | #define lock_cpu_hotplug_interruptible() down_interruptible(&cpucontrol)
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| 66 | #define hotcpu_notifier(fn, pri) { \
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| 67 | static struct notifier_block fn##_nb = \
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| 68 | { .notifier_call = fn, .priority = pri }; \
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| 69 | register_cpu_notifier(&fn##_nb); \
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| 70 | }
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| 71 | int cpu_down(unsigned int cpu);
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| 72 | extern int __attribute__((weak)) smp_prepare_cpu(int cpu);
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| 73 | #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
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| 74 | #else
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| 75 | #define lock_cpu_hotplug() do { } while (0)
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| 76 | #define unlock_cpu_hotplug() do { } while (0)
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| 77 | #define lock_cpu_hotplug_interruptible() 0
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| 78 | #define hotcpu_notifier(fn, pri)
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| 79 |
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| 80 |
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| 81 | static inline int cpu_is_offline(int cpu) { return 0; }
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| 82 | #endif
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| 83 |
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| 84 | #endif
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