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cpu/hotplug: Move scheduler cpu_online notifier to hotplug core
[deliverable/linux.git] / include / linux / cpu.h
CommitLineData
1da177e4
LT		 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
1da177e4 9 *
611a75e1 10 * CPUs are exported via sysfs in the devices/system/cpu
1da177e4 11 * directory.
1da177e4
LT		 12 */
13#ifndef _LINUX_CPU_H_
14#define _LINUX_CPU_H_
15
1da177e4
LT		 16#include <linux/node.h>
17#include <linux/compiler.h>
18#include <linux/cpumask.h>
cff7d378 19#include <linux/cpuhotplug.h>
1da177e4 20
313162d0 21struct device;
d1cb9d1a 22struct device_node;
3d52943b 23struct attribute_group;
313162d0 24
1da177e4
LT		 25struct cpu {
26 int node_id; /* The node which contains the CPU */
72486f1f 27 int hotpluggable; /* creates sysfs control file if hotpluggable */
8a25a2fd 28 struct device dev;
1da177e4
LT		 29};
30
cff7d378
TG		 31extern void boot_cpu_init(void);
32extern void boot_cpu_state_init(void);
33
76b67ed9 34extern int register_cpu(struct cpu *cpu, int num);
8a25a2fd 35extern struct device *get_cpu_device(unsigned cpu);
2987557f 36extern bool cpu_is_hotpluggable(unsigned cpu);
183912d3 37extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
d1cb9d1a
DM		 38extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
39 int cpu, unsigned int *thread);
0344c6c5 40
8a25a2fd
KS		 41extern int cpu_add_dev_attr(struct device_attribute *attr);
42extern void cpu_remove_dev_attr(struct device_attribute *attr);
0344c6c5 43
8a25a2fd
KS		 44extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
45extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
0344c6c5 46
8db14860
NI		 47extern __printf(4, 5)
48struct device *cpu_device_create(struct device *parent, void *drvdata,
49 const struct attribute_group **groups,
50 const char *fmt, ...);
1da177e4 51#ifdef CONFIG_HOTPLUG_CPU
76b67ed9 52extern void unregister_cpu(struct cpu *cpu);
12633e80
NF		 53extern ssize_t arch_cpu_probe(const char *, size_t);
54extern ssize_t arch_cpu_release(const char *, size_t);
1da177e4
LT		 55#endif
56struct notifier_block;
57
50a323b7
TH		 58/*
59 * CPU notifier priorities.
60 */
61enum {
3a101d05
TH		 62 /*
63 * SCHED_ACTIVE marks a cpu which is coming up active during
64 * CPU_ONLINE and CPU_DOWN_FAILED and must be the first
65 * notifier. CPUSET_ACTIVE adjusts cpuset according to
66 * cpu_active mask right after SCHED_ACTIVE. During
67 * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are
68 * ordered in the similar way.
69 *
70 * This ordering guarantees consistent cpu_active mask and
71 * migration behavior to all cpu notifiers.
72 */
73 CPU_PRI_SCHED_ACTIVE = INT_MAX,
74 CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1,
75 CPU_PRI_SCHED_INACTIVE = INT_MIN + 1,
76 CPU_PRI_CPUSET_INACTIVE = INT_MIN,
77
50a323b7
TH		 78 /* migration should happen before other stuff but after perf */
79 CPU_PRI_PERF = 20,
80 CPU_PRI_MIGRATION = 10,
00df35f9 81 CPU_PRI_SMPBOOT = 9,
65758202
TH		 82 /* bring up workqueues before normal notifiers and down after */
83 CPU_PRI_WORKQUEUE_UP = 5,
84 CPU_PRI_WORKQUEUE_DOWN = -5,
50a323b7
TH		 85};
86
80f1ff97
AW		 87#define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
88#define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
89#define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
90#define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */
91#define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */
92#define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
93#define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task,
94 * not handling interrupts, soon dead.
95 * Called on the dying cpu, interrupts
96 * are already disabled. Must not
97 * sleep, must not fail */
98#define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
99 * lock is dropped */
100#define CPU_STARTING 0x000A /* CPU (unsigned)v soon running.
101 * Called on the new cpu, just before
102 * enabling interrupts. Must not sleep,
103 * must not fail */
88428cc5
PM		 104#define CPU_DYING_IDLE 0x000B /* CPU (unsigned)v dying, reached
105 * idle loop. */
8038dad7
PM		 106#define CPU_BROKEN 0x000C /* CPU (unsigned)v did not die properly,
107 * perhaps due to preemption. */
80f1ff97
AW		 108
109/* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
110 * operation in progress
111 */
112#define CPU_TASKS_FROZEN 0x0010
113
114#define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
115#define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
116#define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
117#define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
118#define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
119#define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
120#define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN)
121#define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN)
122
123
1da177e4 124#ifdef CONFIG_SMP
090e77c3 125extern bool cpuhp_tasks_frozen;
1da177e4 126/* Need to know about CPUs going up/down? */
799e64f0
PM		 127#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
128#define cpu_notifier(fn, pri) { \
0db0628d 129 static struct notifier_block fn##_nb = \
799e64f0
PM		 130 { .notifier_call = fn, .priority = pri }; \
131 register_cpu_notifier(&fn##_nb); \
132}
93ae4f97
SB		 133
134#define __cpu_notifier(fn, pri) { \
135 static struct notifier_block fn##_nb = \
136 { .notifier_call = fn, .priority = pri }; \
137 __register_cpu_notifier(&fn##_nb); \
138}
799e64f0
PM		 139#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
140#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
93ae4f97 141#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
799e64f0 142#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
93ae4f97 143
65edc68c 144#ifdef CONFIG_HOTPLUG_CPU
47e627bc 145extern int register_cpu_notifier(struct notifier_block *nb);
93ae4f97 146extern int __register_cpu_notifier(struct notifier_block *nb);
1da177e4 147extern void unregister_cpu_notifier(struct notifier_block *nb);
93ae4f97 148extern void __unregister_cpu_notifier(struct notifier_block *nb);
65edc68c 149#else
47e627bc
AK		 150
151#ifndef MODULE
152extern int register_cpu_notifier(struct notifier_block *nb);
93ae4f97 153extern int __register_cpu_notifier(struct notifier_block *nb);
47e627bc
AK		 154#else
155static inline int register_cpu_notifier(struct notifier_block *nb)
156{
157 return 0;
158}
93ae4f97
SB		 159
160static inline int __register_cpu_notifier(struct notifier_block *nb)
161{
162 return 0;
163}
47e627bc
AK		 164#endif
165
65edc68c
CS		 166static inline void unregister_cpu_notifier(struct notifier_block *nb)
167{
168}
93ae4f97
SB		 169
170static inline void __unregister_cpu_notifier(struct notifier_block *nb)
171{
172}
65edc68c 173#endif
1da177e4 174
00df35f9 175void smpboot_thread_init(void);
1da177e4 176int cpu_up(unsigned int cpu);
e545a614 177void notify_cpu_starting(unsigned int cpu);
3da1c84c
ON		 178extern void cpu_maps_update_begin(void);
179extern void cpu_maps_update_done(void);
d0d23b54 180
93ae4f97
SB		 181#define cpu_notifier_register_begin cpu_maps_update_begin
182#define cpu_notifier_register_done cpu_maps_update_done
183
3da1c84c 184#else /* CONFIG_SMP */
090e77c3 185#define cpuhp_tasks_frozen 0
1da177e4 186
799e64f0 187#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
93ae4f97 188#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
799e64f0 189
1da177e4
LT		 190static inline int register_cpu_notifier(struct notifier_block *nb)
191{
192 return 0;
193}
d0d23b54 194
93ae4f97
SB		 195static inline int __register_cpu_notifier(struct notifier_block *nb)
196{
197 return 0;
198}
199
1da177e4
LT		 200static inline void unregister_cpu_notifier(struct notifier_block *nb)
201{
202}
203
93ae4f97
SB		 204static inline void __unregister_cpu_notifier(struct notifier_block *nb)
205{
206}
207
3da1c84c
ON		 208static inline void cpu_maps_update_begin(void)
209{
210}
211
212static inline void cpu_maps_update_done(void)
213{
214}
215
93ae4f97
SB		 216static inline void cpu_notifier_register_begin(void)
217{
218}
219
220static inline void cpu_notifier_register_done(void)
221{
222}
223
590ee7db
IM		 224static inline void smpboot_thread_init(void)
225{
226}
227
1da177e4 228#endif /* CONFIG_SMP */
8a25a2fd 229extern struct bus_type cpu_subsys;
1da177e4
LT		 230
231#ifdef CONFIG_HOTPLUG_CPU
232/* Stop CPUs going up and down. */
f7dff2b1 233
b9d10be7
TK		 234extern void cpu_hotplug_begin(void);
235extern void cpu_hotplug_done(void);
86ef5c9a
GS		 236extern void get_online_cpus(void);
237extern void put_online_cpus(void);
16e53dbf
SB		 238extern void cpu_hotplug_disable(void);
239extern void cpu_hotplug_enable(void);
799e64f0 240#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
93ae4f97 241#define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri)
39f4885c 242#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
93ae4f97 243#define __register_hotcpu_notifier(nb) __register_cpu_notifier(nb)
39f4885c 244#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
93ae4f97 245#define __unregister_hotcpu_notifier(nb) __unregister_cpu_notifier(nb)
cb79295e 246void clear_tasks_mm_cpumask(int cpu);
1da177e4 247int cpu_down(unsigned int cpu);
f7dff2b1
GS		 248
249#else /* CONFIG_HOTPLUG_CPU */
250
b9d10be7
TK		 251static inline void cpu_hotplug_begin(void) {}
252static inline void cpu_hotplug_done(void) {}
86ef5c9a
GS		 253#define get_online_cpus() do { } while (0)
254#define put_online_cpus() do { } while (0)
16e53dbf
SB		 255#define cpu_hotplug_disable() do { } while (0)
256#define cpu_hotplug_enable() do { } while (0)
02316067 257#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
93ae4f97 258#define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
761bb431
SS		 259/* These aren't inline functions due to a GCC bug. */
260#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
93ae4f97 261#define __register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
761bb431 262#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
93ae4f97 263#define __unregister_hotcpu_notifier(nb) ({ (void)(nb); })
f7dff2b1 264#endif /* CONFIG_HOTPLUG_CPU */
1da177e4 265
f3de4be9 266#ifdef CONFIG_PM_SLEEP_SMP
e3920fb4
RW		 267extern int disable_nonboot_cpus(void);
268extern void enable_nonboot_cpus(void);
f3de4be9 269#else /* !CONFIG_PM_SLEEP_SMP */
e3920fb4
RW		 270static inline int disable_nonboot_cpus(void) { return 0; }
271static inline void enable_nonboot_cpus(void) {}
f3de4be9 272#endif /* !CONFIG_PM_SLEEP_SMP */
e3920fb4 273
a1a04ec3 274void cpu_startup_entry(enum cpuhp_state state);
a1a04ec3 275
d1669912
TG		 276void cpu_idle_poll_ctrl(bool enable);
277
278void arch_cpu_idle(void);
279void arch_cpu_idle_prepare(void);
280void arch_cpu_idle_enter(void);
281void arch_cpu_idle_exit(void);
282void arch_cpu_idle_dead(void);
283
8038dad7
PM		 284DECLARE_PER_CPU(bool, cpu_dead_idle);
285
286int cpu_report_state(int cpu);
287int cpu_check_up_prepare(int cpu);
288void cpu_set_state_online(int cpu);
289#ifdef CONFIG_HOTPLUG_CPU
290bool cpu_wait_death(unsigned int cpu, int seconds);
291bool cpu_report_death(void);
292#endif /* #ifdef CONFIG_HOTPLUG_CPU */
293
1da177e4 294#endif /* _LINUX_CPU_H_ */
Linux kernel - Deliverables
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