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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | */ |
| 14 | #ifndef _LINUX_CPU_H_ |
| 15 | #define _LINUX_CPU_H_ |
| 16 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 17 | #include <linux/device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/node.h> |
| 19 | #include <linux/compiler.h> |
| 20 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | struct cpu { |
| 23 | int node_id; /* The node which contains the CPU */ |
Siddha, Suresh B | 72486f1 | 2006-12-07 02:14:10 +0100 | [diff] [blame] | 24 | int hotpluggable; /* creates sysfs control file if hotpluggable */ |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 25 | struct device dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | }; |
| 27 | |
KAMEZAWA Hiroyuki | 76b67ed9 | 2006-06-27 02:53:41 -0700 | [diff] [blame] | 28 | extern int register_cpu(struct cpu *cpu, int num); |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 29 | extern struct device *get_cpu_device(unsigned cpu); |
Josh Triplett | 2987557 | 2011-12-03 13:06:50 -0800 | [diff] [blame] | 30 | extern bool cpu_is_hotpluggable(unsigned cpu); |
Christian Krafft | 0344c6c | 2006-10-24 18:31:24 +0200 | [diff] [blame] | 31 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 32 | extern int cpu_add_dev_attr(struct device_attribute *attr); |
| 33 | extern void cpu_remove_dev_attr(struct device_attribute *attr); |
Christian Krafft | 0344c6c | 2006-10-24 18:31:24 +0200 | [diff] [blame] | 34 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 35 | extern int cpu_add_dev_attr_group(struct attribute_group *attrs); |
| 36 | extern void cpu_remove_dev_attr_group(struct attribute_group *attrs); |
Christian Krafft | 0344c6c | 2006-10-24 18:31:24 +0200 | [diff] [blame] | 37 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 38 | extern int sched_create_sysfs_power_savings_entries(struct device *dev); |
Christian Krafft | 0344c6c | 2006-10-24 18:31:24 +0200 | [diff] [blame] | 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #ifdef CONFIG_HOTPLUG_CPU |
KAMEZAWA Hiroyuki | 76b67ed9 | 2006-06-27 02:53:41 -0700 | [diff] [blame] | 41 | extern void unregister_cpu(struct cpu *cpu); |
Nathan Fontenot | 12633e8 | 2009-11-25 17:23:25 +0000 | [diff] [blame] | 42 | extern ssize_t arch_cpu_probe(const char *, size_t); |
| 43 | extern ssize_t arch_cpu_release(const char *, size_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #endif |
| 45 | struct notifier_block; |
| 46 | |
Thomas Renninger | fad12ac | 2012-01-26 00:09:14 +0100 | [diff] [blame^] | 47 | #ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE |
| 48 | extern int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env); |
| 49 | extern ssize_t arch_print_cpu_modalias(struct device *dev, |
| 50 | struct device_attribute *attr, |
| 51 | char *bufptr); |
| 52 | #endif |
| 53 | |
Tejun Heo | 50a323b | 2010-06-08 21:40:36 +0200 | [diff] [blame] | 54 | /* |
| 55 | * CPU notifier priorities. |
| 56 | */ |
| 57 | enum { |
Tejun Heo | 3a101d0 | 2010-06-08 21:40:36 +0200 | [diff] [blame] | 58 | /* |
| 59 | * SCHED_ACTIVE marks a cpu which is coming up active during |
| 60 | * CPU_ONLINE and CPU_DOWN_FAILED and must be the first |
| 61 | * notifier. CPUSET_ACTIVE adjusts cpuset according to |
| 62 | * cpu_active mask right after SCHED_ACTIVE. During |
| 63 | * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are |
| 64 | * ordered in the similar way. |
| 65 | * |
| 66 | * This ordering guarantees consistent cpu_active mask and |
| 67 | * migration behavior to all cpu notifiers. |
| 68 | */ |
| 69 | CPU_PRI_SCHED_ACTIVE = INT_MAX, |
| 70 | CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1, |
| 71 | CPU_PRI_SCHED_INACTIVE = INT_MIN + 1, |
| 72 | CPU_PRI_CPUSET_INACTIVE = INT_MIN, |
| 73 | |
Tejun Heo | 50a323b | 2010-06-08 21:40:36 +0200 | [diff] [blame] | 74 | /* migration should happen before other stuff but after perf */ |
| 75 | CPU_PRI_PERF = 20, |
| 76 | CPU_PRI_MIGRATION = 10, |
Tejun Heo | db7bccf | 2010-06-29 10:07:12 +0200 | [diff] [blame] | 77 | /* prepare workqueues for other notifiers */ |
| 78 | CPU_PRI_WORKQUEUE = 5, |
Tejun Heo | 50a323b | 2010-06-08 21:40:36 +0200 | [diff] [blame] | 79 | }; |
| 80 | |
Amerigo Wang | 80f1ff9 | 2011-07-25 17:13:08 -0700 | [diff] [blame] | 81 | #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ |
| 82 | #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ |
| 83 | #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ |
| 84 | #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ |
| 85 | #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ |
| 86 | #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ |
| 87 | #define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task, |
| 88 | * not handling interrupts, soon dead. |
| 89 | * Called on the dying cpu, interrupts |
| 90 | * are already disabled. Must not |
| 91 | * sleep, must not fail */ |
| 92 | #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug |
| 93 | * lock is dropped */ |
| 94 | #define CPU_STARTING 0x000A /* CPU (unsigned)v soon running. |
| 95 | * Called on the new cpu, just before |
| 96 | * enabling interrupts. Must not sleep, |
| 97 | * must not fail */ |
| 98 | |
| 99 | /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend |
| 100 | * operation in progress |
| 101 | */ |
| 102 | #define CPU_TASKS_FROZEN 0x0010 |
| 103 | |
| 104 | #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN) |
| 105 | #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN) |
| 106 | #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN) |
| 107 | #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) |
| 108 | #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) |
| 109 | #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) |
| 110 | #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) |
| 111 | #define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN) |
| 112 | |
| 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | #ifdef CONFIG_SMP |
| 115 | /* Need to know about CPUs going up/down? */ |
Paul E. McKenney | 799e64f | 2009-08-15 09:53:47 -0700 | [diff] [blame] | 116 | #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) |
| 117 | #define cpu_notifier(fn, pri) { \ |
| 118 | static struct notifier_block fn##_nb __cpuinitdata = \ |
| 119 | { .notifier_call = fn, .priority = pri }; \ |
| 120 | register_cpu_notifier(&fn##_nb); \ |
| 121 | } |
| 122 | #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ |
| 123 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
| 124 | #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ |
Chandra Seetharaman | 65edc68 | 2006-06-27 02:54:08 -0700 | [diff] [blame] | 125 | #ifdef CONFIG_HOTPLUG_CPU |
Avi Kivity | 47e627b | 2007-02-12 00:54:43 -0800 | [diff] [blame] | 126 | extern int register_cpu_notifier(struct notifier_block *nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
Chandra Seetharaman | 65edc68 | 2006-06-27 02:54:08 -0700 | [diff] [blame] | 128 | #else |
Avi Kivity | 47e627b | 2007-02-12 00:54:43 -0800 | [diff] [blame] | 129 | |
| 130 | #ifndef MODULE |
| 131 | extern int register_cpu_notifier(struct notifier_block *nb); |
| 132 | #else |
| 133 | static inline int register_cpu_notifier(struct notifier_block *nb) |
| 134 | { |
| 135 | return 0; |
| 136 | } |
| 137 | #endif |
| 138 | |
Chandra Seetharaman | 65edc68 | 2006-06-27 02:54:08 -0700 | [diff] [blame] | 139 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
| 140 | { |
| 141 | } |
| 142 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
| 144 | int cpu_up(unsigned int cpu); |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 145 | void notify_cpu_starting(unsigned int cpu); |
Oleg Nesterov | 3da1c84 | 2008-07-25 01:47:50 -0700 | [diff] [blame] | 146 | extern void cpu_maps_update_begin(void); |
| 147 | extern void cpu_maps_update_done(void); |
Ingo Molnar | d0d23b5 | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 148 | |
Oleg Nesterov | 3da1c84 | 2008-07-25 01:47:50 -0700 | [diff] [blame] | 149 | #else /* CONFIG_SMP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
Paul E. McKenney | 799e64f | 2009-08-15 09:53:47 -0700 | [diff] [blame] | 151 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
| 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | static inline int register_cpu_notifier(struct notifier_block *nb) |
| 154 | { |
| 155 | return 0; |
| 156 | } |
Ingo Molnar | d0d23b5 | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
| 159 | { |
| 160 | } |
| 161 | |
Oleg Nesterov | 3da1c84 | 2008-07-25 01:47:50 -0700 | [diff] [blame] | 162 | static inline void cpu_maps_update_begin(void) |
| 163 | { |
| 164 | } |
| 165 | |
| 166 | static inline void cpu_maps_update_done(void) |
| 167 | { |
| 168 | } |
| 169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | #endif /* CONFIG_SMP */ |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 171 | extern struct bus_type cpu_subsys; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
| 173 | #ifdef CONFIG_HOTPLUG_CPU |
| 174 | /* Stop CPUs going up and down. */ |
Gautham R Shenoy | f7dff2b | 2006-12-06 20:38:58 -0800 | [diff] [blame] | 175 | |
Gautham R Shenoy | 86ef5c9 | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 176 | extern void get_online_cpus(void); |
| 177 | extern void put_online_cpus(void); |
Paul E. McKenney | 799e64f | 2009-08-15 09:53:47 -0700 | [diff] [blame] | 178 | #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) |
Chandra Seetharaman | 39f4885 | 2006-06-27 02:54:10 -0700 | [diff] [blame] | 179 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
| 180 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | int cpu_down(unsigned int cpu); |
Gautham R Shenoy | f7dff2b | 2006-12-06 20:38:58 -0800 | [diff] [blame] | 182 | |
Gautham R Shenoy | 51badeb | 2009-11-26 09:59:05 +0000 | [diff] [blame] | 183 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE |
| 184 | extern void cpu_hotplug_driver_lock(void); |
| 185 | extern void cpu_hotplug_driver_unlock(void); |
| 186 | #else |
| 187 | static inline void cpu_hotplug_driver_lock(void) |
| 188 | { |
| 189 | } |
| 190 | |
| 191 | static inline void cpu_hotplug_driver_unlock(void) |
| 192 | { |
| 193 | } |
| 194 | #endif |
| 195 | |
Gautham R Shenoy | f7dff2b | 2006-12-06 20:38:58 -0800 | [diff] [blame] | 196 | #else /* CONFIG_HOTPLUG_CPU */ |
| 197 | |
Gautham R Shenoy | 86ef5c9 | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 198 | #define get_online_cpus() do { } while (0) |
| 199 | #define put_online_cpus() do { } while (0) |
Ingo Molnar | 02316067 | 2006-12-06 20:38:17 -0800 | [diff] [blame] | 200 | #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
Satyam Sharma | 761bb43 | 2007-10-18 03:06:38 -0700 | [diff] [blame] | 201 | /* These aren't inline functions due to a GCC bug. */ |
| 202 | #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) |
| 203 | #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) |
Gautham R Shenoy | f7dff2b | 2006-12-06 20:38:58 -0800 | [diff] [blame] | 204 | #endif /* CONFIG_HOTPLUG_CPU */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Rafael J. Wysocki | f3de4be | 2007-08-30 23:56:29 -0700 | [diff] [blame] | 206 | #ifdef CONFIG_PM_SLEEP_SMP |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 207 | extern int disable_nonboot_cpus(void); |
| 208 | extern void enable_nonboot_cpus(void); |
Rafael J. Wysocki | f3de4be | 2007-08-30 23:56:29 -0700 | [diff] [blame] | 209 | #else /* !CONFIG_PM_SLEEP_SMP */ |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 210 | static inline int disable_nonboot_cpus(void) { return 0; } |
| 211 | static inline void enable_nonboot_cpus(void) {} |
Rafael J. Wysocki | f3de4be | 2007-08-30 23:56:29 -0700 | [diff] [blame] | 212 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | #endif /* _LINUX_CPU_H_ */ |