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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  * and system devices are handled in drivers/base/sys.c. 
 10  *
 11  * CPUs are exported via sysfs in the class/cpu/devices/
 12  * directory. 
 13  */
 14 #ifndef _LINUX_CPU_H_
 15 #define _LINUX_CPU_H_
 16 
 17 #include <linux/node.h>
 18 #include <linux/compiler.h>
 19 #include <linux/cpumask.h>
 20 
 21 struct device;
 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 
 33 extern int cpu_add_dev_attr(struct device_attribute *attr);
 34 extern void cpu_remove_dev_attr(struct device_attribute *attr);
 35 
 36 extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
 37 extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
 38 
 39 extern int sched_create_sysfs_power_savings_entries(struct device *dev);
 40 
 41 #ifdef CONFIG_HOTPLUG_CPU
 42 extern void unregister_cpu(struct cpu *cpu);
 43 extern ssize_t arch_cpu_probe(const char *, size_t);
 44 extern ssize_t arch_cpu_release(const char *, size_t);
 45 #endif
 46 struct notifier_block;
 47 
 48 #ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
 49 extern int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env);
 50 extern ssize_t arch_print_cpu_modalias(struct device *dev,
 51                                        struct device_attribute *attr,
 52                                        char *bufptr);
 53 #endif
 54 
 55 /*
 56  * CPU notifier priorities.
 57  */
 58 enum {
 59         /*
 60          * SCHED_ACTIVE marks a cpu which is coming up active during
 61          * CPU_ONLINE and CPU_DOWN_FAILED and must be the first
 62          * notifier.  CPUSET_ACTIVE adjusts cpuset according to
 63          * cpu_active mask right after SCHED_ACTIVE.  During
 64          * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are
 65          * ordered in the similar way.
 66          *
 67          * This ordering guarantees consistent cpu_active mask and
 68          * migration behavior to all cpu notifiers.
 69          */
 70         CPU_PRI_SCHED_ACTIVE    = INT_MAX,
 71         CPU_PRI_CPUSET_ACTIVE   = INT_MAX - 1,
 72         CPU_PRI_SCHED_INACTIVE  = INT_MIN + 1,
 73         CPU_PRI_CPUSET_INACTIVE = INT_MIN,
 74 
 75         /* migration should happen before other stuff but after perf */
 76         CPU_PRI_PERF            = 20,
 77         CPU_PRI_MIGRATION       = 10,
 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 
101 /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
102  * operation in progress
103  */
104 #define CPU_TASKS_FROZEN        0x0010
105 
106 #define CPU_ONLINE_FROZEN       (CPU_ONLINE | CPU_TASKS_FROZEN)
107 #define CPU_UP_PREPARE_FROZEN   (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
108 #define CPU_UP_CANCELED_FROZEN  (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
109 #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
110 #define CPU_DOWN_FAILED_FROZEN  (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
111 #define CPU_DEAD_FROZEN         (CPU_DEAD | CPU_TASKS_FROZEN)
112 #define CPU_DYING_FROZEN        (CPU_DYING | CPU_TASKS_FROZEN)
113 #define CPU_STARTING_FROZEN     (CPU_STARTING | CPU_TASKS_FROZEN)
114 
115 
116 #ifdef CONFIG_SMP
117 /* Need to know about CPUs going up/down? */
118 #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
119 #define cpu_notifier(fn, pri) {                                 \
120         static struct notifier_block fn##_nb __cpuinitdata =    \
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 #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
127 #ifdef CONFIG_HOTPLUG_CPU
128 extern int register_cpu_notifier(struct notifier_block *nb);
129 extern void unregister_cpu_notifier(struct notifier_block *nb);
130 #else
131 
132 #ifndef MODULE
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 #endif
140 
141 static inline void unregister_cpu_notifier(struct notifier_block *nb)
142 {
143 }
144 #endif
145 
146 int cpu_up(unsigned int cpu);
147 void notify_cpu_starting(unsigned int cpu);
148 extern void cpu_maps_update_begin(void);
149 extern void cpu_maps_update_done(void);
150 
151 #else   /* CONFIG_SMP */
152 
153 #define cpu_notifier(fn, pri)   do { (void)(fn); } while (0)
154 
155 static inline int register_cpu_notifier(struct notifier_block *nb)
156 {
157         return 0;
158 }
159 
160 static inline void unregister_cpu_notifier(struct notifier_block *nb)
161 {
162 }
163 
164 static inline void cpu_maps_update_begin(void)
165 {
166 }
167 
168 static inline void cpu_maps_update_done(void)
169 {
170 }
171 
172 #endif /* CONFIG_SMP */
173 extern struct bus_type cpu_subsys;
174 
175 #ifdef CONFIG_HOTPLUG_CPU
176 /* Stop CPUs going up and down. */
177 
178 extern void get_online_cpus(void);
179 extern void put_online_cpus(void);
180 extern void cpu_hotplug_disable(void);
181 extern void cpu_hotplug_enable(void);
182 #define hotcpu_notifier(fn, pri)        cpu_notifier(fn, pri)
183 #define register_hotcpu_notifier(nb)    register_cpu_notifier(nb)
184 #define unregister_hotcpu_notifier(nb)  unregister_cpu_notifier(nb)
185 int cpu_down(unsigned int cpu);
186 
187 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
188 extern void cpu_hotplug_driver_lock(void);
189 extern void cpu_hotplug_driver_unlock(void);
190 #else
191 static inline void cpu_hotplug_driver_lock(void)
192 {
193 }
194 
195 static inline void cpu_hotplug_driver_unlock(void)
196 {
197 }
198 #endif
199 
200 #else           /* CONFIG_HOTPLUG_CPU */
201 
202 #define get_online_cpus()       do { } while (0)
203 #define put_online_cpus()       do { } while (0)
204 #define cpu_hotplug_disable()   do { } while (0)
205 #define cpu_hotplug_enable()    do { } while (0)
206 #define hotcpu_notifier(fn, pri)        do { (void)(fn); } while (0)
207 /* These aren't inline functions due to a GCC bug. */
208 #define register_hotcpu_notifier(nb)    ({ (void)(nb); 0; })
209 #define unregister_hotcpu_notifier(nb)  ({ (void)(nb); })
210 #endif          /* CONFIG_HOTPLUG_CPU */
211 
212 #ifdef CONFIG_PM_SLEEP_SMP
213 extern int disable_nonboot_cpus(void);
214 extern void enable_nonboot_cpus(void);
215 #else /* !CONFIG_PM_SLEEP_SMP */
216 static inline int disable_nonboot_cpus(void) { return 0; }
217 static inline void enable_nonboot_cpus(void) {}
218 #endif /* !CONFIG_PM_SLEEP_SMP */
219 
220 #endif /* _LINUX_CPU_H_ */
221 

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