include/linux/cpu.h at v3.18-rc7 · tjh.dev/kernel

tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
kernel / include / linux / cpu.h
at v3.18-rc7 8.5 kB view raw
  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 *
 10 * CPUs are exported via sysfs in the devices/system/cpu
 11 * directory. 
 12 */
 13#ifndef _LINUX_CPU_H_
 14#define _LINUX_CPU_H_
 15
 16#include <linux/node.h>
 17#include <linux/compiler.h>
 18#include <linux/cpumask.h>
 19
 20struct device;
 21struct device_node;
 22
 23struct cpu {
 24	int node_id;		/* The node which contains the CPU */
 25	int hotpluggable;	/* creates sysfs control file if hotpluggable */
 26	struct device dev;
 27};
 28
 29extern int register_cpu(struct cpu *cpu, int num);
 30extern struct device *get_cpu_device(unsigned cpu);
 31extern bool cpu_is_hotpluggable(unsigned cpu);
 32extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
 33extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
 34					      int cpu, unsigned int *thread);
 35
 36extern int cpu_add_dev_attr(struct device_attribute *attr);
 37extern void cpu_remove_dev_attr(struct device_attribute *attr);
 38
 39extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
 40extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
 41
 42#ifdef CONFIG_HOTPLUG_CPU
 43extern void unregister_cpu(struct cpu *cpu);
 44extern ssize_t arch_cpu_probe(const char *, size_t);
 45extern ssize_t arch_cpu_release(const char *, size_t);
 46#endif
 47struct notifier_block;
 48
 49/*
 50 * CPU notifier priorities.
 51 */
 52enum {
 53	/*
 54	 * SCHED_ACTIVE marks a cpu which is coming up active during
 55	 * CPU_ONLINE and CPU_DOWN_FAILED and must be the first
 56	 * notifier.  CPUSET_ACTIVE adjusts cpuset according to
 57	 * cpu_active mask right after SCHED_ACTIVE.  During
 58	 * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are
 59	 * ordered in the similar way.
 60	 *
 61	 * This ordering guarantees consistent cpu_active mask and
 62	 * migration behavior to all cpu notifiers.
 63	 */
 64	CPU_PRI_SCHED_ACTIVE	= INT_MAX,
 65	CPU_PRI_CPUSET_ACTIVE	= INT_MAX - 1,
 66	CPU_PRI_SCHED_INACTIVE	= INT_MIN + 1,
 67	CPU_PRI_CPUSET_INACTIVE	= INT_MIN,
 68
 69	/* migration should happen before other stuff but after perf */
 70	CPU_PRI_PERF		= 20,
 71	CPU_PRI_MIGRATION	= 10,
 72	/* bring up workqueues before normal notifiers and down after */
 73	CPU_PRI_WORKQUEUE_UP	= 5,
 74	CPU_PRI_WORKQUEUE_DOWN	= -5,
 75};
 76
 77#define CPU_ONLINE		0x0002 /* CPU (unsigned)v is up */
 78#define CPU_UP_PREPARE		0x0003 /* CPU (unsigned)v coming up */
 79#define CPU_UP_CANCELED		0x0004 /* CPU (unsigned)v NOT coming up */
 80#define CPU_DOWN_PREPARE	0x0005 /* CPU (unsigned)v going down */
 81#define CPU_DOWN_FAILED		0x0006 /* CPU (unsigned)v NOT going down */
 82#define CPU_DEAD		0x0007 /* CPU (unsigned)v dead */
 83#define CPU_DYING		0x0008 /* CPU (unsigned)v not running any task,
 84					* not handling interrupts, soon dead.
 85					* Called on the dying cpu, interrupts
 86					* are already disabled. Must not
 87					* sleep, must not fail */
 88#define CPU_POST_DEAD		0x0009 /* CPU (unsigned)v dead, cpu_hotplug
 89					* lock is dropped */
 90#define CPU_STARTING		0x000A /* CPU (unsigned)v soon running.
 91					* Called on the new cpu, just before
 92					* enabling interrupts. Must not sleep,
 93					* must not fail */
 94
 95/* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
 96 * operation in progress
 97 */
 98#define CPU_TASKS_FROZEN	0x0010
 99
100#define CPU_ONLINE_FROZEN	(CPU_ONLINE | CPU_TASKS_FROZEN)
101#define CPU_UP_PREPARE_FROZEN	(CPU_UP_PREPARE | CPU_TASKS_FROZEN)
102#define CPU_UP_CANCELED_FROZEN	(CPU_UP_CANCELED | CPU_TASKS_FROZEN)
103#define CPU_DOWN_PREPARE_FROZEN	(CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
104#define CPU_DOWN_FAILED_FROZEN	(CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
105#define CPU_DEAD_FROZEN		(CPU_DEAD | CPU_TASKS_FROZEN)
106#define CPU_DYING_FROZEN	(CPU_DYING | CPU_TASKS_FROZEN)
107#define CPU_STARTING_FROZEN	(CPU_STARTING | CPU_TASKS_FROZEN)
108
109
110#ifdef CONFIG_SMP
111/* Need to know about CPUs going up/down? */
112#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
113#define cpu_notifier(fn, pri) {					\
114	static struct notifier_block fn##_nb =			\
115		{ .notifier_call = fn, .priority = pri };	\
116	register_cpu_notifier(&fn##_nb);			\
117}
118
119#define __cpu_notifier(fn, pri) {				\
120	static struct notifier_block fn##_nb =			\
121		{ .notifier_call = fn, .priority = pri };	\
122	__register_cpu_notifier(&fn##_nb);			\
123}
124#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
125#define cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
126#define __cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
127#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
128
129#ifdef CONFIG_HOTPLUG_CPU
130extern int register_cpu_notifier(struct notifier_block *nb);
131extern int __register_cpu_notifier(struct notifier_block *nb);
132extern void unregister_cpu_notifier(struct notifier_block *nb);
133extern void __unregister_cpu_notifier(struct notifier_block *nb);
134#else
135
136#ifndef MODULE
137extern int register_cpu_notifier(struct notifier_block *nb);
138extern int __register_cpu_notifier(struct notifier_block *nb);
139#else
140static inline int register_cpu_notifier(struct notifier_block *nb)
141{
142	return 0;
143}
144
145static inline int __register_cpu_notifier(struct notifier_block *nb)
146{
147	return 0;
148}
149#endif
150
151static inline void unregister_cpu_notifier(struct notifier_block *nb)
152{
153}
154
155static inline void __unregister_cpu_notifier(struct notifier_block *nb)
156{
157}
158#endif
159
160int cpu_up(unsigned int cpu);
161void notify_cpu_starting(unsigned int cpu);
162extern void cpu_maps_update_begin(void);
163extern void cpu_maps_update_done(void);
164
165#define cpu_notifier_register_begin	cpu_maps_update_begin
166#define cpu_notifier_register_done	cpu_maps_update_done
167
168#else	/* CONFIG_SMP */
169
170#define cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
171#define __cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
172
173static inline int register_cpu_notifier(struct notifier_block *nb)
174{
175	return 0;
176}
177
178static inline int __register_cpu_notifier(struct notifier_block *nb)
179{
180	return 0;
181}
182
183static inline void unregister_cpu_notifier(struct notifier_block *nb)
184{
185}
186
187static inline void __unregister_cpu_notifier(struct notifier_block *nb)
188{
189}
190
191static inline void cpu_maps_update_begin(void)
192{
193}
194
195static inline void cpu_maps_update_done(void)
196{
197}
198
199static inline void cpu_notifier_register_begin(void)
200{
201}
202
203static inline void cpu_notifier_register_done(void)
204{
205}
206
207#endif /* CONFIG_SMP */
208extern struct bus_type cpu_subsys;
209
210#ifdef CONFIG_HOTPLUG_CPU
211/* Stop CPUs going up and down. */
212
213extern void cpu_hotplug_begin(void);
214extern void cpu_hotplug_done(void);
215extern void get_online_cpus(void);
216extern bool try_get_online_cpus(void);
217extern void put_online_cpus(void);
218extern void cpu_hotplug_disable(void);
219extern void cpu_hotplug_enable(void);
220#define hotcpu_notifier(fn, pri)	cpu_notifier(fn, pri)
221#define __hotcpu_notifier(fn, pri)	__cpu_notifier(fn, pri)
222#define register_hotcpu_notifier(nb)	register_cpu_notifier(nb)
223#define __register_hotcpu_notifier(nb)	__register_cpu_notifier(nb)
224#define unregister_hotcpu_notifier(nb)	unregister_cpu_notifier(nb)
225#define __unregister_hotcpu_notifier(nb)	__unregister_cpu_notifier(nb)
226void clear_tasks_mm_cpumask(int cpu);
227int cpu_down(unsigned int cpu);
228
229#else		/* CONFIG_HOTPLUG_CPU */
230
231static inline void cpu_hotplug_begin(void) {}
232static inline void cpu_hotplug_done(void) {}
233#define get_online_cpus()	do { } while (0)
234#define try_get_online_cpus()	true
235#define put_online_cpus()	do { } while (0)
236#define cpu_hotplug_disable()	do { } while (0)
237#define cpu_hotplug_enable()	do { } while (0)
238#define hotcpu_notifier(fn, pri)	do { (void)(fn); } while (0)
239#define __hotcpu_notifier(fn, pri)	do { (void)(fn); } while (0)
240/* These aren't inline functions due to a GCC bug. */
241#define register_hotcpu_notifier(nb)	({ (void)(nb); 0; })
242#define __register_hotcpu_notifier(nb)	({ (void)(nb); 0; })
243#define unregister_hotcpu_notifier(nb)	({ (void)(nb); })
244#define __unregister_hotcpu_notifier(nb)	({ (void)(nb); })
245#endif		/* CONFIG_HOTPLUG_CPU */
246
247#ifdef CONFIG_PM_SLEEP_SMP
248extern int disable_nonboot_cpus(void);
249extern void enable_nonboot_cpus(void);
250#else /* !CONFIG_PM_SLEEP_SMP */
251static inline int disable_nonboot_cpus(void) { return 0; }
252static inline void enable_nonboot_cpus(void) {}
253#endif /* !CONFIG_PM_SLEEP_SMP */
254
255enum cpuhp_state {
256	CPUHP_OFFLINE,
257	CPUHP_ONLINE,
258};
259
260void cpu_startup_entry(enum cpuhp_state state);
261
262void cpu_idle_poll_ctrl(bool enable);
263
264void arch_cpu_idle(void);
265void arch_cpu_idle_prepare(void);
266void arch_cpu_idle_enter(void);
267void arch_cpu_idle_exit(void);
268void arch_cpu_idle_dead(void);
269
270#endif /* _LINUX_CPU_H_ */