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Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
[linux-2.6-block.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>
1da177e4 19
313162d0 20struct device;
d1cb9d1a 21struct device_node;
3d52943b 22struct attribute_group;
313162d0 23
1da177e4
LT		 24struct cpu {
25 int node_id; /* The node which contains the CPU */
72486f1f 26 int hotpluggable; /* creates sysfs control file if hotpluggable */
8a25a2fd 27 struct device dev;
1da177e4
LT		 28};
29
76b67ed9 30extern int register_cpu(struct cpu *cpu, int num);
8a25a2fd 31extern struct device *get_cpu_device(unsigned cpu);
2987557f 32extern bool cpu_is_hotpluggable(unsigned cpu);
183912d3 33extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
d1cb9d1a
DM		 34extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
35 int cpu, unsigned int *thread);
0344c6c5 36
8a25a2fd
KS		 37extern int cpu_add_dev_attr(struct device_attribute *attr);
38extern void cpu_remove_dev_attr(struct device_attribute *attr);
0344c6c5 39
8a25a2fd
KS		 40extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
41extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
0344c6c5 42
8db14860
NI		 43extern __printf(4, 5)
44struct device *cpu_device_create(struct device *parent, void *drvdata,
45 const struct attribute_group **groups,
46 const char *fmt, ...);
1da177e4 47#ifdef CONFIG_HOTPLUG_CPU
76b67ed9 48extern void unregister_cpu(struct cpu *cpu);
12633e80
NF		 49extern ssize_t arch_cpu_probe(const char *, size_t);
50extern ssize_t arch_cpu_release(const char *, size_t);
1da177e4
LT		 51#endif
52struct notifier_block;
53
50a323b7
TH		 54/*
55 * CPU notifier priorities.
56 */
57enum {
3a101d05
TH		 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
50a323b7
TH		 74 /* migration should happen before other stuff but after perf */
75 CPU_PRI_PERF = 20,
76 CPU_PRI_MIGRATION = 10,
00df35f9 77 CPU_PRI_SMPBOOT = 9,
65758202
TH		 78 /* bring up workqueues before normal notifiers and down after */
79 CPU_PRI_WORKQUEUE_UP = 5,
80 CPU_PRI_WORKQUEUE_DOWN = -5,
50a323b7
TH		 81};
82
80f1ff97
AW		 83#define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
84#define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
85#define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
86#define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */
87#define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */
88#define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
89#define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task,
90 * not handling interrupts, soon dead.
91 * Called on the dying cpu, interrupts
92 * are already disabled. Must not
93 * sleep, must not fail */
94#define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
95 * lock is dropped */
96#define CPU_STARTING 0x000A /* CPU (unsigned)v soon running.
97 * Called on the new cpu, just before
98 * enabling interrupts. Must not sleep,
99 * must not fail */
88428cc5
PM		 100#define CPU_DYING_IDLE 0x000B /* CPU (unsigned)v dying, reached
101 * idle loop. */
8038dad7
PM		 102#define CPU_BROKEN 0x000C /* CPU (unsigned)v did not die properly,
103 * perhaps due to preemption. */
80f1ff97
AW		 104
105/* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
106 * operation in progress
107 */
108#define CPU_TASKS_FROZEN 0x0010
109
110#define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
111#define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
112#define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
113#define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
114#define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
115#define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
116#define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN)
117#define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN)
118
119
1da177e4
LT		 120#ifdef CONFIG_SMP
121/* Need to know about CPUs going up/down? */
799e64f0
PM		 122#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
123#define cpu_notifier(fn, pri) { \
0db0628d 124 static struct notifier_block fn##_nb = \
799e64f0
PM		 125 { .notifier_call = fn, .priority = pri }; \
126 register_cpu_notifier(&fn##_nb); \
127}
93ae4f97
SB		 128
129#define __cpu_notifier(fn, pri) { \
130 static struct notifier_block fn##_nb = \
131 { .notifier_call = fn, .priority = pri }; \
132 __register_cpu_notifier(&fn##_nb); \
133}
799e64f0
PM		 134#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
135#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
93ae4f97 136#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
799e64f0 137#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
93ae4f97 138
65edc68c 139#ifdef CONFIG_HOTPLUG_CPU
47e627bc 140extern int register_cpu_notifier(struct notifier_block *nb);
93ae4f97 141extern int __register_cpu_notifier(struct notifier_block *nb);
1da177e4 142extern void unregister_cpu_notifier(struct notifier_block *nb);
93ae4f97 143extern void __unregister_cpu_notifier(struct notifier_block *nb);
65edc68c 144#else
47e627bc
AK		 145
146#ifndef MODULE
147extern int register_cpu_notifier(struct notifier_block *nb);
93ae4f97 148extern int __register_cpu_notifier(struct notifier_block *nb);
47e627bc
AK		 149#else
150static inline int register_cpu_notifier(struct notifier_block *nb)
151{
152 return 0;
153}
93ae4f97
SB		 154
155static inline int __register_cpu_notifier(struct notifier_block *nb)
156{
157 return 0;
158}
47e627bc
AK		 159#endif
160
65edc68c
CS		 161static inline void unregister_cpu_notifier(struct notifier_block *nb)
162{
163}
93ae4f97
SB		 164
165static inline void __unregister_cpu_notifier(struct notifier_block *nb)
166{
167}
65edc68c 168#endif
1da177e4 169
00df35f9 170void smpboot_thread_init(void);
1da177e4 171int cpu_up(unsigned int cpu);
e545a614 172void notify_cpu_starting(unsigned int cpu);
3da1c84c
ON		 173extern void cpu_maps_update_begin(void);
174extern void cpu_maps_update_done(void);
d0d23b54 175
93ae4f97
SB		 176#define cpu_notifier_register_begin cpu_maps_update_begin
177#define cpu_notifier_register_done cpu_maps_update_done
178
3da1c84c 179#else /* CONFIG_SMP */
1da177e4 180
799e64f0 181#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
93ae4f97 182#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
799e64f0 183
1da177e4
LT		 184static inline int register_cpu_notifier(struct notifier_block *nb)
185{
186 return 0;
187}
d0d23b54 188
93ae4f97
SB		 189static inline int __register_cpu_notifier(struct notifier_block *nb)
190{
191 return 0;
192}
193
1da177e4
LT		 194static inline void unregister_cpu_notifier(struct notifier_block *nb)
195{
196}
197
93ae4f97
SB		 198static inline void __unregister_cpu_notifier(struct notifier_block *nb)
199{
200}
201
3da1c84c
ON		 202static inline void cpu_maps_update_begin(void)
203{
204}
205
206static inline void cpu_maps_update_done(void)
207{
208}
209
93ae4f97
SB		 210static inline void cpu_notifier_register_begin(void)
211{
212}
213
214static inline void cpu_notifier_register_done(void)
215{
216}
217
590ee7db
IM		 218static inline void smpboot_thread_init(void)
219{
220}
221
1da177e4 222#endif /* CONFIG_SMP */
8a25a2fd 223extern struct bus_type cpu_subsys;
1da177e4
LT		 224
225#ifdef CONFIG_HOTPLUG_CPU
226/* Stop CPUs going up and down. */
f7dff2b1 227
b9d10be7
TK		 228extern void cpu_hotplug_begin(void);
229extern void cpu_hotplug_done(void);
86ef5c9a 230extern void get_online_cpus(void);
dd56af42 231extern bool try_get_online_cpus(void);
86ef5c9a 232extern void put_online_cpus(void);
16e53dbf
SB		 233extern void cpu_hotplug_disable(void);
234extern void cpu_hotplug_enable(void);
799e64f0 235#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
93ae4f97 236#define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri)
39f4885c 237#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
93ae4f97 238#define __register_hotcpu_notifier(nb) __register_cpu_notifier(nb)
39f4885c 239#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
93ae4f97 240#define __unregister_hotcpu_notifier(nb) __unregister_cpu_notifier(nb)
cb79295e 241void clear_tasks_mm_cpumask(int cpu);
1da177e4 242int cpu_down(unsigned int cpu);
f7dff2b1
GS		 243
244#else /* CONFIG_HOTPLUG_CPU */
245
b9d10be7
TK		 246static inline void cpu_hotplug_begin(void) {}
247static inline void cpu_hotplug_done(void) {}
86ef5c9a 248#define get_online_cpus() do { } while (0)
dd56af42 249#define try_get_online_cpus() true
86ef5c9a 250#define put_online_cpus() do { } while (0)
16e53dbf
SB		 251#define cpu_hotplug_disable() do { } while (0)
252#define cpu_hotplug_enable() do { } while (0)
02316067 253#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
93ae4f97 254#define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
761bb431
SS		 255/* These aren't inline functions due to a GCC bug. */
256#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
93ae4f97 257#define __register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
761bb431 258#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
93ae4f97 259#define __unregister_hotcpu_notifier(nb) ({ (void)(nb); })
f7dff2b1 260#endif /* CONFIG_HOTPLUG_CPU */
1da177e4 261
f3de4be9 262#ifdef CONFIG_PM_SLEEP_SMP
e3920fb4
RW		 263extern int disable_nonboot_cpus(void);
264extern void enable_nonboot_cpus(void);
f3de4be9 265#else /* !CONFIG_PM_SLEEP_SMP */
e3920fb4
RW		 266static inline int disable_nonboot_cpus(void) { return 0; }
267static inline void enable_nonboot_cpus(void) {}
f3de4be9 268#endif /* !CONFIG_PM_SLEEP_SMP */
e3920fb4 269
a1a04ec3
TG		 270enum cpuhp_state {
271 CPUHP_OFFLINE,
272 CPUHP_ONLINE,
273};
274
275void cpu_startup_entry(enum cpuhp_state state);
a1a04ec3 276
d1669912
TG		 277void cpu_idle_poll_ctrl(bool enable);
278
279void arch_cpu_idle(void);
280void arch_cpu_idle_prepare(void);
281void arch_cpu_idle_enter(void);
282void arch_cpu_idle_exit(void);
283void arch_cpu_idle_dead(void);
284
8038dad7
PM		 285DECLARE_PER_CPU(bool, cpu_dead_idle);
286
287int cpu_report_state(int cpu);
288int cpu_check_up_prepare(int cpu);
289void cpu_set_state_online(int cpu);
290#ifdef CONFIG_HOTPLUG_CPU
291bool cpu_wait_death(unsigned int cpu, int seconds);
292bool cpu_report_death(void);
293#endif /* #ifdef CONFIG_HOTPLUG_CPU */
294
1da177e4 295#endif /* _LINUX_CPU_H_ */
Linux 6.x block layer and io_uring tree(s)