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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 #ifdef CONFIG_HOTPLUG_CPU
 40 extern void unregister_cpu(struct cpu *cpu);
 41 extern ssize_t arch_cpu_probe(const char *, size_t);
 42 extern ssize_t arch_cpu_release(const char *, size_t);
 43 #endif
 44 struct notifier_block;
 45 
 46 #ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
 47 extern int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env);
 48 extern ssize_t arch_print_cpu_modalias(struct device *dev,
 49                                        struct device_attribute *attr,
 50                                        char *bufptr);
 51 #endif
 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 __cpuinitdata =    \
119                 { .notifier_call = fn, .priority = pri };       \
120         register_cpu_notifier(&fn##_nb);                        \
121 }
122 #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
123 #define cpu_notifier(fn, pri)   do { (void)(fn); } while (0)
124 #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
125 #ifdef CONFIG_HOTPLUG_CPU
126 extern int register_cpu_notifier(struct notifier_block *nb);
127 extern void unregister_cpu_notifier(struct notifier_block *nb);
128 #else
129 
130 #ifndef MODULE
131 extern int register_cpu_notifier(struct notifier_block *nb);
132 #else
133 static inline int register_cpu_notifier(struct notifier_block *nb)
134 {
135         return 0;
136 }
137 #endif
138 
139 static inline void unregister_cpu_notifier(struct notifier_block *nb)
140 {
141 }
142 #endif
143 
144 int cpu_up(unsigned int cpu);
145 void notify_cpu_starting(unsigned int cpu);
146 extern void cpu_maps_update_begin(void);
147 extern void cpu_maps_update_done(void);
148 
149 #else   /* CONFIG_SMP */
150 
151 #define cpu_notifier(fn, pri)   do { (void)(fn); } while (0)
152 
153 static inline int register_cpu_notifier(struct notifier_block *nb)
154 {
155         return 0;
156 }
157 
158 static inline void unregister_cpu_notifier(struct notifier_block *nb)
159 {
160 }
161 
162 static inline void cpu_maps_update_begin(void)
163 {
164 }
165 
166 static inline void cpu_maps_update_done(void)
167 {
168 }
169 
170 #endif /* CONFIG_SMP */
171 extern struct bus_type cpu_subsys;
172 
173 #ifdef CONFIG_HOTPLUG_CPU
174 /* Stop CPUs going up and down. */
175 
176 extern void get_online_cpus(void);
177 extern void put_online_cpus(void);
178 extern void cpu_hotplug_disable(void);
179 extern void cpu_hotplug_enable(void);
180 #define hotcpu_notifier(fn, pri)        cpu_notifier(fn, pri)
181 #define register_hotcpu_notifier(nb)    register_cpu_notifier(nb)
182 #define unregister_hotcpu_notifier(nb)  unregister_cpu_notifier(nb)
183 void clear_tasks_mm_cpumask(int cpu);
184 int cpu_down(unsigned int cpu);
185 
186 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
187 extern void cpu_hotplug_driver_lock(void);
188 extern void cpu_hotplug_driver_unlock(void);
189 #else
190 static inline void cpu_hotplug_driver_lock(void)
191 {
192 }
193 
194 static inline void cpu_hotplug_driver_unlock(void)
195 {
196 }
197 #endif
198 
199 #else           /* CONFIG_HOTPLUG_CPU */
200 
201 #define get_online_cpus()       do { } while (0)
202 #define put_online_cpus()       do { } while (0)
203 #define cpu_hotplug_disable()   do { } while (0)
204 #define cpu_hotplug_enable()    do { } while (0)
205 #define hotcpu_notifier(fn, pri)        do { (void)(fn); } while (0)
206 /* These aren't inline functions due to a GCC bug. */
207 #define register_hotcpu_notifier(nb)    ({ (void)(nb); 0; })
208 #define unregister_hotcpu_notifier(nb)  ({ (void)(nb); })
209 #endif          /* CONFIG_HOTPLUG_CPU */
210 
211 #ifdef CONFIG_PM_SLEEP_SMP
212 extern int disable_nonboot_cpus(void);
213 extern void enable_nonboot_cpus(void);
214 #else /* !CONFIG_PM_SLEEP_SMP */
215 static inline int disable_nonboot_cpus(void) { return 0; }
216 static inline void enable_nonboot_cpus(void) {}
217 #endif /* !CONFIG_PM_SLEEP_SMP */
218 
219 #endif /* _LINUX_CPU_H_ */
220 

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