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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 struct attribute_group;
 23 
 24 struct cpu {
 25         int node_id;            /* The node which contains the CPU */
 26         int hotpluggable;       /* creates sysfs control file if hotpluggable */
 27         struct device dev;
 28 };
 29 
 30 extern int register_cpu(struct cpu *cpu, int num);
 31 extern struct device *get_cpu_device(unsigned cpu);
 32 extern bool cpu_is_hotpluggable(unsigned cpu);
 33 extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
 34 extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
 35                                               int cpu, unsigned int *thread);
 36 
 37 extern int cpu_add_dev_attr(struct device_attribute *attr);
 38 extern void cpu_remove_dev_attr(struct device_attribute *attr);
 39 
 40 extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
 41 extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
 42 
 43 extern struct device *cpu_device_create(struct device *parent, void *drvdata,
 44                                         const struct attribute_group **groups,
 45                                         const char *fmt, ...);
 46 #ifdef CONFIG_HOTPLUG_CPU
 47 extern void unregister_cpu(struct cpu *cpu);
 48 extern ssize_t arch_cpu_probe(const char *, size_t);
 49 extern ssize_t arch_cpu_release(const char *, size_t);
 50 #endif
 51 struct notifier_block;
 52 
 53 /*
 54  * CPU notifier priorities.
 55  */
 56 enum {
 57         /*
 58          * SCHED_ACTIVE marks a cpu which is coming up active during
 59          * CPU_ONLINE and CPU_DOWN_FAILED and must be the first
 60          * notifier.  CPUSET_ACTIVE adjusts cpuset according to
 61          * cpu_active mask right after SCHED_ACTIVE.  During
 62          * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are
 63          * ordered in the similar way.
 64          *
 65          * This ordering guarantees consistent cpu_active mask and
 66          * migration behavior to all cpu notifiers.
 67          */
 68         CPU_PRI_SCHED_ACTIVE    = INT_MAX,
 69         CPU_PRI_CPUSET_ACTIVE   = INT_MAX - 1,
 70         CPU_PRI_SCHED_INACTIVE  = INT_MIN + 1,
 71         CPU_PRI_CPUSET_INACTIVE = INT_MIN,
 72 
 73         /* migration should happen before other stuff but after perf */
 74         CPU_PRI_PERF            = 20,
 75         CPU_PRI_MIGRATION       = 10,
 76         /* bring up workqueues before normal notifiers and down after */
 77         CPU_PRI_WORKQUEUE_UP    = 5,
 78         CPU_PRI_WORKQUEUE_DOWN  = -5,
 79 };
 80 
 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 
114 #ifdef CONFIG_SMP
115 /* Need to know about CPUs going up/down? */
116 #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
117 #define cpu_notifier(fn, pri) {                                 \
118         static struct notifier_block fn##_nb =                  \
119                 { .notifier_call = fn, .priority = pri };       \
120         register_cpu_notifier(&fn##_nb);                        \
121 }
122 
123 #define __cpu_notifier(fn, pri) {                               \
124         static struct notifier_block fn##_nb =                  \
125                 { .notifier_call = fn, .priority = pri };       \
126         __register_cpu_notifier(&fn##_nb);                      \
127 }
128 #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
129 #define cpu_notifier(fn, pri)   do { (void)(fn); } while (0)
130 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
131 #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
132 
133 #ifdef CONFIG_HOTPLUG_CPU
134 extern int register_cpu_notifier(struct notifier_block *nb);
135 extern int __register_cpu_notifier(struct notifier_block *nb);
136 extern void unregister_cpu_notifier(struct notifier_block *nb);
137 extern void __unregister_cpu_notifier(struct notifier_block *nb);
138 #else
139 
140 #ifndef MODULE
141 extern int register_cpu_notifier(struct notifier_block *nb);
142 extern int __register_cpu_notifier(struct notifier_block *nb);
143 #else
144 static inline int register_cpu_notifier(struct notifier_block *nb)
145 {
146         return 0;
147 }
148 
149 static inline int __register_cpu_notifier(struct notifier_block *nb)
150 {
151         return 0;
152 }
153 #endif
154 
155 static inline void unregister_cpu_notifier(struct notifier_block *nb)
156 {
157 }
158 
159 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
160 {
161 }
162 #endif
163 
164 int cpu_up(unsigned int cpu);
165 void notify_cpu_starting(unsigned int cpu);
166 extern void cpu_maps_update_begin(void);
167 extern void cpu_maps_update_done(void);
168 
169 #define cpu_notifier_register_begin     cpu_maps_update_begin
170 #define cpu_notifier_register_done      cpu_maps_update_done
171 
172 #else   /* CONFIG_SMP */
173 
174 #define cpu_notifier(fn, pri)   do { (void)(fn); } while (0)
175 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
176 
177 static inline int register_cpu_notifier(struct notifier_block *nb)
178 {
179         return 0;
180 }
181 
182 static inline int __register_cpu_notifier(struct notifier_block *nb)
183 {
184         return 0;
185 }
186 
187 static inline void unregister_cpu_notifier(struct notifier_block *nb)
188 {
189 }
190 
191 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
192 {
193 }
194 
195 static inline void cpu_maps_update_begin(void)
196 {
197 }
198 
199 static inline void cpu_maps_update_done(void)
200 {
201 }
202 
203 static inline void cpu_notifier_register_begin(void)
204 {
205 }
206 
207 static inline void cpu_notifier_register_done(void)
208 {
209 }
210 
211 #endif /* CONFIG_SMP */
212 extern struct bus_type cpu_subsys;
213 
214 #ifdef CONFIG_HOTPLUG_CPU
215 /* Stop CPUs going up and down. */
216 
217 extern void cpu_hotplug_begin(void);
218 extern void cpu_hotplug_done(void);
219 extern void get_online_cpus(void);
220 extern bool try_get_online_cpus(void);
221 extern void put_online_cpus(void);
222 extern void cpu_hotplug_disable(void);
223 extern void cpu_hotplug_enable(void);
224 #define hotcpu_notifier(fn, pri)        cpu_notifier(fn, pri)
225 #define __hotcpu_notifier(fn, pri)      __cpu_notifier(fn, pri)
226 #define register_hotcpu_notifier(nb)    register_cpu_notifier(nb)
227 #define __register_hotcpu_notifier(nb)  __register_cpu_notifier(nb)
228 #define unregister_hotcpu_notifier(nb)  unregister_cpu_notifier(nb)
229 #define __unregister_hotcpu_notifier(nb)        __unregister_cpu_notifier(nb)
230 void clear_tasks_mm_cpumask(int cpu);
231 int cpu_down(unsigned int cpu);
232 
233 #else           /* CONFIG_HOTPLUG_CPU */
234 
235 static inline void cpu_hotplug_begin(void) {}
236 static inline void cpu_hotplug_done(void) {}
237 #define get_online_cpus()       do { } while (0)
238 #define try_get_online_cpus()   true
239 #define put_online_cpus()       do { } while (0)
240 #define cpu_hotplug_disable()   do { } while (0)
241 #define cpu_hotplug_enable()    do { } while (0)
242 #define hotcpu_notifier(fn, pri)        do { (void)(fn); } while (0)
243 #define __hotcpu_notifier(fn, pri)      do { (void)(fn); } while (0)
244 /* These aren't inline functions due to a GCC bug. */
245 #define register_hotcpu_notifier(nb)    ({ (void)(nb); 0; })
246 #define __register_hotcpu_notifier(nb)  ({ (void)(nb); 0; })
247 #define unregister_hotcpu_notifier(nb)  ({ (void)(nb); })
248 #define __unregister_hotcpu_notifier(nb)        ({ (void)(nb); })
249 #endif          /* CONFIG_HOTPLUG_CPU */
250 
251 #ifdef CONFIG_PM_SLEEP_SMP
252 extern int disable_nonboot_cpus(void);
253 extern void enable_nonboot_cpus(void);
254 #else /* !CONFIG_PM_SLEEP_SMP */
255 static inline int disable_nonboot_cpus(void) { return 0; }
256 static inline void enable_nonboot_cpus(void) {}
257 #endif /* !CONFIG_PM_SLEEP_SMP */
258 
259 enum cpuhp_state {
260         CPUHP_OFFLINE,
261         CPUHP_ONLINE,
262 };
263 
264 void cpu_startup_entry(enum cpuhp_state state);
265 
266 void cpu_idle_poll_ctrl(bool enable);
267 
268 void arch_cpu_idle(void);
269 void arch_cpu_idle_prepare(void);
270 void arch_cpu_idle_enter(void);
271 void arch_cpu_idle_exit(void);
272 void arch_cpu_idle_dead(void);
273 
274 #endif /* _LINUX_CPU_H_ */
275 

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