Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Rolf Eike Beer | d51fe1b | 2005-09-02 08:59:25 +0200 | [diff] [blame] | 11 | * CPUs are exported via sysfs in the class/cpu/devices/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 28 | struct cpu { |
| 29 | int node_id; /* The node which contains the CPU */ |
| 30 | int no_control; /* Should the sysfs control file be created? */ |
| 31 | struct sys_device sysdev; |
| 32 | }; |
| 33 | |
KAMEZAWA Hiroyuki | 76b67ed | 2006-06-27 02:53:41 -0700 | [diff] [blame] | 34 | extern int register_cpu(struct cpu *cpu, int num); |
Andrew Morton | a29d642 | 2006-03-07 23:53:25 -0800 | [diff] [blame] | 35 | extern struct sys_device *get_cpu_sysdev(unsigned cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #ifdef CONFIG_HOTPLUG_CPU |
KAMEZAWA Hiroyuki | 76b67ed | 2006-06-27 02:53:41 -0700 | [diff] [blame] | 37 | extern void unregister_cpu(struct cpu *cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #endif |
| 39 | struct notifier_block; |
| 40 | |
| 41 | #ifdef CONFIG_SMP |
| 42 | /* Need to know about CPUs going up/down? */ |
| 43 | extern int register_cpu_notifier(struct notifier_block *nb); |
Chandra Seetharaman | 65edc68 | 2006-06-27 02:54:08 -0700 | [diff] [blame] | 44 | #ifdef CONFIG_HOTPLUG_CPU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
Chandra Seetharaman | 65edc68 | 2006-06-27 02:54:08 -0700 | [diff] [blame] | 46 | #else |
| 47 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
| 48 | { |
| 49 | } |
| 50 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | int cpu_up(unsigned int cpu); |
| 53 | |
| 54 | #else |
| 55 | |
| 56 | static inline int register_cpu_notifier(struct notifier_block *nb) |
| 57 | { |
| 58 | return 0; |
| 59 | } |
| 60 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
| 61 | { |
| 62 | } |
| 63 | |
| 64 | #endif /* CONFIG_SMP */ |
| 65 | extern struct sysdev_class cpu_sysdev_class; |
| 66 | |
| 67 | #ifdef CONFIG_HOTPLUG_CPU |
| 68 | /* Stop CPUs going up and down. */ |
Ashok Raj | a9d9baa | 2005-11-28 13:43:46 -0800 | [diff] [blame] | 69 | extern void lock_cpu_hotplug(void); |
| 70 | extern void unlock_cpu_hotplug(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #define hotcpu_notifier(fn, pri) { \ |
| 72 | static struct notifier_block fn##_nb = \ |
| 73 | { .notifier_call = fn, .priority = pri }; \ |
| 74 | register_cpu_notifier(&fn##_nb); \ |
| 75 | } |
Chandra Seetharaman | 39f4885 | 2006-06-27 02:54:10 -0700 | [diff] [blame] | 76 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
| 77 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | int cpu_down(unsigned int cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) |
| 80 | #else |
| 81 | #define lock_cpu_hotplug() do { } while (0) |
| 82 | #define unlock_cpu_hotplug() do { } while (0) |
| 83 | #define lock_cpu_hotplug_interruptible() 0 |
Andrew Morton | e2c2770 | 2006-07-01 04:36:30 -0700 | [diff] [blame] | 84 | #define hotcpu_notifier(fn, pri) do { } while (0) |
| 85 | #define register_hotcpu_notifier(nb) do { } while (0) |
| 86 | #define unregister_hotcpu_notifier(nb) do { } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | /* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */ |
| 89 | static inline int cpu_is_offline(int cpu) { return 0; } |
| 90 | #endif |
| 91 | |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame^] | 92 | #ifdef CONFIG_SUSPEND_SMP |
| 93 | extern int disable_nonboot_cpus(void); |
| 94 | extern void enable_nonboot_cpus(void); |
| 95 | #else |
| 96 | static inline int disable_nonboot_cpus(void) { return 0; } |
| 97 | static inline void enable_nonboot_cpus(void) {} |
| 98 | #endif |
| 99 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | #endif /* _LINUX_CPU_H_ */ |