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TOMOYO Linux Cross Reference
Linux/include/linux/cpu.h

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  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 
 20 struct device;
 21 struct device_node;
 22 
 23 struct 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 
 29 extern int register_cpu(struct cpu *cpu, int num);
 30 extern struct device *get_cpu_device(unsigned cpu);
 31 extern bool cpu_is_hotpluggable(unsigned cpu);
 32 extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
 33 extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
 34                                               int cpu, unsigned int *thread);
 35 
 36 extern int cpu_add_dev_attr(struct device_attribute *attr);
 37 extern void cpu_remove_dev_attr(struct device_attribute *attr);
 38 
 39 extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
 40 extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
 41 
 42 #ifdef CONFIG_HOTPLUG_CPU
 43 extern void unregister_cpu(struct cpu *cpu);
 44 extern ssize_t arch_cpu_probe(const char *, size_t);
 45 extern ssize_t arch_cpu_release(const char *, size_t);
 46 #endif
 47 struct notifier_block;
 48 
 49 /*
 50  * CPU notifier priorities.
 51  */
 52 enum {
 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
130 extern int register_cpu_notifier(struct notifier_block *nb);
131 extern int __register_cpu_notifier(struct notifier_block *nb);
132 extern void unregister_cpu_notifier(struct notifier_block *nb);
133 extern void __unregister_cpu_notifier(struct notifier_block *nb);
134 #else
135 
136 #ifndef MODULE
137 extern int register_cpu_notifier(struct notifier_block *nb);
138 extern int __register_cpu_notifier(struct notifier_block *nb);
139 #else
140 static inline int register_cpu_notifier(struct notifier_block *nb)
141 {
142         return 0;
143 }
144 
145 static inline int __register_cpu_notifier(struct notifier_block *nb)
146 {
147         return 0;
148 }
149 #endif
150 
151 static inline void unregister_cpu_notifier(struct notifier_block *nb)
152 {
153 }
154 
155 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
156 {
157 }
158 #endif
159 
160 int cpu_up(unsigned int cpu);
161 void notify_cpu_starting(unsigned int cpu);
162 extern void cpu_maps_update_begin(void);
163 extern 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 
173 static inline int register_cpu_notifier(struct notifier_block *nb)
174 {
175         return 0;
176 }
177 
178 static inline int __register_cpu_notifier(struct notifier_block *nb)
179 {
180         return 0;
181 }
182 
183 static inline void unregister_cpu_notifier(struct notifier_block *nb)
184 {
185 }
186 
187 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
188 {
189 }
190 
191 static inline void cpu_maps_update_begin(void)
192 {
193 }
194 
195 static inline void cpu_maps_update_done(void)
196 {
197 }
198 
199 static inline void cpu_notifier_register_begin(void)
200 {
201 }
202 
203 static inline void cpu_notifier_register_done(void)
204 {
205 }
206 
207 #endif /* CONFIG_SMP */
208 extern struct bus_type cpu_subsys;
209 
210 #ifdef CONFIG_HOTPLUG_CPU
211 /* Stop CPUs going up and down. */
212 
213 extern void cpu_hotplug_begin(void);
214 extern void cpu_hotplug_done(void);
215 extern void get_online_cpus(void);
216 extern void put_online_cpus(void);
217 extern void cpu_hotplug_disable(void);
218 extern void cpu_hotplug_enable(void);
219 #define hotcpu_notifier(fn, pri)        cpu_notifier(fn, pri)
220 #define __hotcpu_notifier(fn, pri)      __cpu_notifier(fn, pri)
221 #define register_hotcpu_notifier(nb)    register_cpu_notifier(nb)
222 #define __register_hotcpu_notifier(nb)  __register_cpu_notifier(nb)
223 #define unregister_hotcpu_notifier(nb)  unregister_cpu_notifier(nb)
224 #define __unregister_hotcpu_notifier(nb)        __unregister_cpu_notifier(nb)
225 void clear_tasks_mm_cpumask(int cpu);
226 int cpu_down(unsigned int cpu);
227 
228 #else           /* CONFIG_HOTPLUG_CPU */
229 
230 static inline void cpu_hotplug_begin(void) {}
231 static inline void cpu_hotplug_done(void) {}
232 #define get_online_cpus()       do { } while (0)
233 #define put_online_cpus()       do { } while (0)
234 #define cpu_hotplug_disable()   do { } while (0)
235 #define cpu_hotplug_enable()    do { } while (0)
236 #define hotcpu_notifier(fn, pri)        do { (void)(fn); } while (0)
237 #define __hotcpu_notifier(fn, pri)      do { (void)(fn); } while (0)
238 /* These aren't inline functions due to a GCC bug. */
239 #define register_hotcpu_notifier(nb)    ({ (void)(nb); 0; })
240 #define __register_hotcpu_notifier(nb)  ({ (void)(nb); 0; })
241 #define unregister_hotcpu_notifier(nb)  ({ (void)(nb); })
242 #define __unregister_hotcpu_notifier(nb)        ({ (void)(nb); })
243 #endif          /* CONFIG_HOTPLUG_CPU */
244 
245 #ifdef CONFIG_PM_SLEEP_SMP
246 extern int disable_nonboot_cpus(void);
247 extern void enable_nonboot_cpus(void);
248 #else /* !CONFIG_PM_SLEEP_SMP */
249 static inline int disable_nonboot_cpus(void) { return 0; }
250 static inline void enable_nonboot_cpus(void) {}
251 #endif /* !CONFIG_PM_SLEEP_SMP */
252 
253 enum cpuhp_state {
254         CPUHP_OFFLINE,
255         CPUHP_ONLINE,
256 };
257 
258 void cpu_startup_entry(enum cpuhp_state state);
259 
260 void cpu_idle_poll_ctrl(bool enable);
261 
262 void arch_cpu_idle(void);
263 void arch_cpu_idle_prepare(void);
264 void arch_cpu_idle_enter(void);
265 void arch_cpu_idle_exit(void);
266 void arch_cpu_idle_dead(void);
267 
268 #endif /* _LINUX_CPU_H_ */
269 

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