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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 __printf(4, 5)
 44 struct device *cpu_device_create(struct device *parent, void *drvdata,
 45                                  const struct attribute_group **groups,
 46                                  const char *fmt, ...);
 47 #ifdef CONFIG_HOTPLUG_CPU
 48 extern void unregister_cpu(struct cpu *cpu);
 49 extern ssize_t arch_cpu_probe(const char *, size_t);
 50 extern ssize_t arch_cpu_release(const char *, size_t);
 51 #endif
 52 struct notifier_block;
 53 
 54 /*
 55  * CPU notifier priorities.
 56  */
 57 enum {
 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 
 74         /* migration should happen before other stuff but after perf */
 75         CPU_PRI_PERF            = 20,
 76         CPU_PRI_MIGRATION       = 10,
 77         CPU_PRI_SMPBOOT         = 9,
 78         /* bring up workqueues before normal notifiers and down after */
 79         CPU_PRI_WORKQUEUE_UP    = 5,
 80         CPU_PRI_WORKQUEUE_DOWN  = -5,
 81 };
 82 
 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 */
100 #define CPU_DYING_IDLE          0x000B /* CPU (unsigned)v dying, reached
101                                         * idle loop. */
102 #define CPU_BROKEN              0x000C /* CPU (unsigned)v did not die properly,
103                                         * perhaps due to preemption. */
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 
120 #ifdef CONFIG_SMP
121 /* Need to know about CPUs going up/down? */
122 #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
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 
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 }
134 #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
135 #define cpu_notifier(fn, pri)   do { (void)(fn); } while (0)
136 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
137 #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
138 
139 #ifdef CONFIG_HOTPLUG_CPU
140 extern int register_cpu_notifier(struct notifier_block *nb);
141 extern int __register_cpu_notifier(struct notifier_block *nb);
142 extern void unregister_cpu_notifier(struct notifier_block *nb);
143 extern void __unregister_cpu_notifier(struct notifier_block *nb);
144 #else
145 
146 #ifndef MODULE
147 extern int register_cpu_notifier(struct notifier_block *nb);
148 extern int __register_cpu_notifier(struct notifier_block *nb);
149 #else
150 static inline int register_cpu_notifier(struct notifier_block *nb)
151 {
152         return 0;
153 }
154 
155 static inline int __register_cpu_notifier(struct notifier_block *nb)
156 {
157         return 0;
158 }
159 #endif
160 
161 static inline void unregister_cpu_notifier(struct notifier_block *nb)
162 {
163 }
164 
165 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
166 {
167 }
168 #endif
169 
170 void smpboot_thread_init(void);
171 int cpu_up(unsigned int cpu);
172 void notify_cpu_starting(unsigned int cpu);
173 extern void cpu_maps_update_begin(void);
174 extern void cpu_maps_update_done(void);
175 
176 #define cpu_notifier_register_begin     cpu_maps_update_begin
177 #define cpu_notifier_register_done      cpu_maps_update_done
178 
179 #else   /* CONFIG_SMP */
180 
181 #define cpu_notifier(fn, pri)   do { (void)(fn); } while (0)
182 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
183 
184 static inline int register_cpu_notifier(struct notifier_block *nb)
185 {
186         return 0;
187 }
188 
189 static inline int __register_cpu_notifier(struct notifier_block *nb)
190 {
191         return 0;
192 }
193 
194 static inline void unregister_cpu_notifier(struct notifier_block *nb)
195 {
196 }
197 
198 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
199 {
200 }
201 
202 static inline void cpu_maps_update_begin(void)
203 {
204 }
205 
206 static inline void cpu_maps_update_done(void)
207 {
208 }
209 
210 static inline void cpu_notifier_register_begin(void)
211 {
212 }
213 
214 static inline void cpu_notifier_register_done(void)
215 {
216 }
217 
218 static inline void smpboot_thread_init(void)
219 {
220 }
221 
222 #endif /* CONFIG_SMP */
223 extern struct bus_type cpu_subsys;
224 
225 #ifdef CONFIG_HOTPLUG_CPU
226 /* Stop CPUs going up and down. */
227 
228 extern void cpu_hotplug_begin(void);
229 extern void cpu_hotplug_done(void);
230 extern void get_online_cpus(void);
231 extern bool try_get_online_cpus(void);
232 extern void put_online_cpus(void);
233 extern void cpu_hotplug_disable(void);
234 extern void cpu_hotplug_enable(void);
235 #define hotcpu_notifier(fn, pri)        cpu_notifier(fn, pri)
236 #define __hotcpu_notifier(fn, pri)      __cpu_notifier(fn, pri)
237 #define register_hotcpu_notifier(nb)    register_cpu_notifier(nb)
238 #define __register_hotcpu_notifier(nb)  __register_cpu_notifier(nb)
239 #define unregister_hotcpu_notifier(nb)  unregister_cpu_notifier(nb)
240 #define __unregister_hotcpu_notifier(nb)        __unregister_cpu_notifier(nb)
241 void clear_tasks_mm_cpumask(int cpu);
242 int cpu_down(unsigned int cpu);
243 
244 #else           /* CONFIG_HOTPLUG_CPU */
245 
246 static inline void cpu_hotplug_begin(void) {}
247 static inline void cpu_hotplug_done(void) {}
248 #define get_online_cpus()       do { } while (0)
249 #define try_get_online_cpus()   true
250 #define put_online_cpus()       do { } while (0)
251 #define cpu_hotplug_disable()   do { } while (0)
252 #define cpu_hotplug_enable()    do { } while (0)
253 #define hotcpu_notifier(fn, pri)        do { (void)(fn); } while (0)
254 #define __hotcpu_notifier(fn, pri)      do { (void)(fn); } while (0)
255 /* These aren't inline functions due to a GCC bug. */
256 #define register_hotcpu_notifier(nb)    ({ (void)(nb); 0; })
257 #define __register_hotcpu_notifier(nb)  ({ (void)(nb); 0; })
258 #define unregister_hotcpu_notifier(nb)  ({ (void)(nb); })
259 #define __unregister_hotcpu_notifier(nb)        ({ (void)(nb); })
260 #endif          /* CONFIG_HOTPLUG_CPU */
261 
262 #ifdef CONFIG_PM_SLEEP_SMP
263 extern int disable_nonboot_cpus(void);
264 extern void enable_nonboot_cpus(void);
265 #else /* !CONFIG_PM_SLEEP_SMP */
266 static inline int disable_nonboot_cpus(void) { return 0; }
267 static inline void enable_nonboot_cpus(void) {}
268 #endif /* !CONFIG_PM_SLEEP_SMP */
269 
270 enum cpuhp_state {
271         CPUHP_OFFLINE,
272         CPUHP_ONLINE,
273 };
274 
275 void cpu_startup_entry(enum cpuhp_state state);
276 
277 void cpu_idle_poll_ctrl(bool enable);
278 
279 void arch_cpu_idle(void);
280 void arch_cpu_idle_prepare(void);
281 void arch_cpu_idle_enter(void);
282 void arch_cpu_idle_exit(void);
283 void arch_cpu_idle_dead(void);
284 
285 DECLARE_PER_CPU(bool, cpu_dead_idle);
286 
287 int cpu_report_state(int cpu);
288 int cpu_check_up_prepare(int cpu);
289 void cpu_set_state_online(int cpu);
290 #ifdef CONFIG_HOTPLUG_CPU
291 bool cpu_wait_death(unsigned int cpu, int seconds);
292 bool cpu_report_death(void);
293 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
294 
295 #endif /* _LINUX_CPU_H_ */
296 

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