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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 #include <linux/cpuhotplug.h>
 20 
 21 struct device;
 22 struct device_node;
 23 struct attribute_group;
 24 
 25 struct cpu {
 26         int node_id;            /* The node which contains the CPU */
 27         int hotpluggable;       /* creates sysfs control file if hotpluggable */
 28         struct device dev;
 29 };
 30 
 31 extern void boot_cpu_init(void);
 32 extern void boot_cpu_state_init(void);
 33 
 34 extern int register_cpu(struct cpu *cpu, int num);
 35 extern struct device *get_cpu_device(unsigned cpu);
 36 extern bool cpu_is_hotpluggable(unsigned cpu);
 37 extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
 38 extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
 39                                               int cpu, unsigned int *thread);
 40 
 41 extern int cpu_add_dev_attr(struct device_attribute *attr);
 42 extern void cpu_remove_dev_attr(struct device_attribute *attr);
 43 
 44 extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
 45 extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
 46 
 47 extern __printf(4, 5)
 48 struct device *cpu_device_create(struct device *parent, void *drvdata,
 49                                  const struct attribute_group **groups,
 50                                  const char *fmt, ...);
 51 #ifdef CONFIG_HOTPLUG_CPU
 52 extern void unregister_cpu(struct cpu *cpu);
 53 extern ssize_t arch_cpu_probe(const char *, size_t);
 54 extern ssize_t arch_cpu_release(const char *, size_t);
 55 #endif
 56 struct notifier_block;
 57 
 58 /*
 59  * CPU notifier priorities.
 60  */
 61 enum {
 62         CPU_PRI_PERF            = 20,
 63 
 64         /* bring up workqueues before normal notifiers and down after */
 65         CPU_PRI_WORKQUEUE_UP    = 5,
 66         CPU_PRI_WORKQUEUE_DOWN  = -5,
 67 };
 68 
 69 #define CPU_ONLINE              0x0002 /* CPU (unsigned)v is up */
 70 #define CPU_UP_PREPARE          0x0003 /* CPU (unsigned)v coming up */
 71 #define CPU_UP_CANCELED         0x0004 /* CPU (unsigned)v NOT coming up */
 72 #define CPU_DOWN_PREPARE        0x0005 /* CPU (unsigned)v going down */
 73 #define CPU_DOWN_FAILED         0x0006 /* CPU (unsigned)v NOT going down */
 74 #define CPU_DEAD                0x0007 /* CPU (unsigned)v dead */
 75 #define CPU_DYING               0x0008 /* CPU (unsigned)v not running any task,
 76                                         * not handling interrupts, soon dead.
 77                                         * Called on the dying cpu, interrupts
 78                                         * are already disabled. Must not
 79                                         * sleep, must not fail */
 80 #define CPU_POST_DEAD           0x0009 /* CPU (unsigned)v dead, cpu_hotplug
 81                                         * lock is dropped */
 82 #define CPU_STARTING            0x000A /* CPU (unsigned)v soon running.
 83                                         * Called on the new cpu, just before
 84                                         * enabling interrupts. Must not sleep,
 85                                         * must not fail */
 86 #define CPU_BROKEN              0x000B /* CPU (unsigned)v did not die properly,
 87                                         * perhaps due to preemption. */
 88 
 89 /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
 90  * operation in progress
 91  */
 92 #define CPU_TASKS_FROZEN        0x0010
 93 
 94 #define CPU_ONLINE_FROZEN       (CPU_ONLINE | CPU_TASKS_FROZEN)
 95 #define CPU_UP_PREPARE_FROZEN   (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
 96 #define CPU_UP_CANCELED_FROZEN  (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
 97 #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
 98 #define CPU_DOWN_FAILED_FROZEN  (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
 99 #define CPU_DEAD_FROZEN         (CPU_DEAD | CPU_TASKS_FROZEN)
100 #define CPU_DYING_FROZEN        (CPU_DYING | CPU_TASKS_FROZEN)
101 #define CPU_STARTING_FROZEN     (CPU_STARTING | CPU_TASKS_FROZEN)
102 
103 
104 #ifdef CONFIG_SMP
105 extern bool cpuhp_tasks_frozen;
106 /* Need to know about CPUs going up/down? */
107 #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
108 #define cpu_notifier(fn, pri) {                                 \
109         static struct notifier_block fn##_nb =                  \
110                 { .notifier_call = fn, .priority = pri };       \
111         register_cpu_notifier(&fn##_nb);                        \
112 }
113 
114 #define __cpu_notifier(fn, pri) {                               \
115         static struct notifier_block fn##_nb =                  \
116                 { .notifier_call = fn, .priority = pri };       \
117         __register_cpu_notifier(&fn##_nb);                      \
118 }
119 #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
120 #define cpu_notifier(fn, pri)   do { (void)(fn); } while (0)
121 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
122 #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
123 
124 #ifdef CONFIG_HOTPLUG_CPU
125 extern int register_cpu_notifier(struct notifier_block *nb);
126 extern int __register_cpu_notifier(struct notifier_block *nb);
127 extern void unregister_cpu_notifier(struct notifier_block *nb);
128 extern void __unregister_cpu_notifier(struct notifier_block *nb);
129 #else
130 
131 #ifndef MODULE
132 extern int register_cpu_notifier(struct notifier_block *nb);
133 extern int __register_cpu_notifier(struct notifier_block *nb);
134 #else
135 static inline int register_cpu_notifier(struct notifier_block *nb)
136 {
137         return 0;
138 }
139 
140 static inline int __register_cpu_notifier(struct notifier_block *nb)
141 {
142         return 0;
143 }
144 #endif
145 
146 static inline void unregister_cpu_notifier(struct notifier_block *nb)
147 {
148 }
149 
150 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
151 {
152 }
153 #endif
154 
155 int cpu_up(unsigned int cpu);
156 void notify_cpu_starting(unsigned int cpu);
157 extern void cpu_maps_update_begin(void);
158 extern void cpu_maps_update_done(void);
159 
160 #define cpu_notifier_register_begin     cpu_maps_update_begin
161 #define cpu_notifier_register_done      cpu_maps_update_done
162 
163 #else   /* CONFIG_SMP */
164 #define cpuhp_tasks_frozen      0
165 
166 #define cpu_notifier(fn, pri)   do { (void)(fn); } while (0)
167 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
168 
169 static inline int register_cpu_notifier(struct notifier_block *nb)
170 {
171         return 0;
172 }
173 
174 static inline int __register_cpu_notifier(struct notifier_block *nb)
175 {
176         return 0;
177 }
178 
179 static inline void unregister_cpu_notifier(struct notifier_block *nb)
180 {
181 }
182 
183 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
184 {
185 }
186 
187 static inline void cpu_maps_update_begin(void)
188 {
189 }
190 
191 static inline void cpu_maps_update_done(void)
192 {
193 }
194 
195 static inline void cpu_notifier_register_begin(void)
196 {
197 }
198 
199 static inline void cpu_notifier_register_done(void)
200 {
201 }
202 
203 #endif /* CONFIG_SMP */
204 extern struct bus_type cpu_subsys;
205 
206 #ifdef CONFIG_HOTPLUG_CPU
207 /* Stop CPUs going up and down. */
208 
209 extern void cpu_hotplug_begin(void);
210 extern void cpu_hotplug_done(void);
211 extern void get_online_cpus(void);
212 extern void put_online_cpus(void);
213 extern void cpu_hotplug_disable(void);
214 extern void cpu_hotplug_enable(void);
215 #define hotcpu_notifier(fn, pri)        cpu_notifier(fn, pri)
216 #define __hotcpu_notifier(fn, pri)      __cpu_notifier(fn, pri)
217 #define register_hotcpu_notifier(nb)    register_cpu_notifier(nb)
218 #define __register_hotcpu_notifier(nb)  __register_cpu_notifier(nb)
219 #define unregister_hotcpu_notifier(nb)  unregister_cpu_notifier(nb)
220 #define __unregister_hotcpu_notifier(nb)        __unregister_cpu_notifier(nb)
221 void clear_tasks_mm_cpumask(int cpu);
222 int cpu_down(unsigned int cpu);
223 
224 #else           /* CONFIG_HOTPLUG_CPU */
225 
226 static inline void cpu_hotplug_begin(void) {}
227 static inline void cpu_hotplug_done(void) {}
228 #define get_online_cpus()       do { } while (0)
229 #define put_online_cpus()       do { } while (0)
230 #define cpu_hotplug_disable()   do { } while (0)
231 #define cpu_hotplug_enable()    do { } while (0)
232 #define hotcpu_notifier(fn, pri)        do { (void)(fn); } while (0)
233 #define __hotcpu_notifier(fn, pri)      do { (void)(fn); } while (0)
234 /* These aren't inline functions due to a GCC bug. */
235 #define register_hotcpu_notifier(nb)    ({ (void)(nb); 0; })
236 #define __register_hotcpu_notifier(nb)  ({ (void)(nb); 0; })
237 #define unregister_hotcpu_notifier(nb)  ({ (void)(nb); })
238 #define __unregister_hotcpu_notifier(nb)        ({ (void)(nb); })
239 #endif          /* CONFIG_HOTPLUG_CPU */
240 
241 #ifdef CONFIG_PM_SLEEP_SMP
242 extern int disable_nonboot_cpus(void);
243 extern void enable_nonboot_cpus(void);
244 #else /* !CONFIG_PM_SLEEP_SMP */
245 static inline int disable_nonboot_cpus(void) { return 0; }
246 static inline void enable_nonboot_cpus(void) {}
247 #endif /* !CONFIG_PM_SLEEP_SMP */
248 
249 void cpu_startup_entry(enum cpuhp_state state);
250 
251 void cpu_idle_poll_ctrl(bool enable);
252 
253 void arch_cpu_idle(void);
254 void arch_cpu_idle_prepare(void);
255 void arch_cpu_idle_enter(void);
256 void arch_cpu_idle_exit(void);
257 void arch_cpu_idle_dead(void);
258 
259 int cpu_report_state(int cpu);
260 int cpu_check_up_prepare(int cpu);
261 void cpu_set_state_online(int cpu);
262 #ifdef CONFIG_HOTPLUG_CPU
263 bool cpu_wait_death(unsigned int cpu, int seconds);
264 bool cpu_report_death(void);
265 void cpuhp_report_idle_dead(void);
266 #else
267 static inline void cpuhp_report_idle_dead(void) { }
268 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
269 
270 #endif /* _LINUX_CPU_H_ */
271 

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