include/linux/cpuhotplug.h

   1 #ifndef __CPUHOTPLUG_H
   2 #define __CPUHOTPLUG_H
   3
   4 enum cpuhp_state {
   5         CPUHP_OFFLINE,
   6         CPUHP_CREATE_THREADS,
   7         CPUHP_NOTIFY_PREPARE,
   8         CPUHP_BRINGUP_CPU,
   9         CPUHP_AP_IDLE_DEAD,
  10         CPUHP_AP_OFFLINE,
  11         CPUHP_AP_NOTIFY_STARTING,
  12         CPUHP_AP_ONLINE,
  13         CPUHP_TEARDOWN_CPU,
  14         CPUHP_AP_ONLINE_IDLE,
  15         CPUHP_AP_SMPBOOT_THREADS,
  16         CPUHP_AP_NOTIFY_ONLINE,
  17         CPUHP_AP_ONLINE_DYN,
  18         CPUHP_AP_ONLINE_DYN_END         = CPUHP_AP_ONLINE_DYN + 30,
  19         CPUHP_ONLINE,
  20 };
  21
  22 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke,
  23                         int (*startup)(unsigned int cpu),
  24                         int (*teardown)(unsigned int cpu));
  25
  26 /**
  27  * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks
  28  * @state:      The state for which the calls are installed
  29  * @name:       Name of the callback (will be used in debug output)
  30  * @startup:    startup callback function
  31  * @teardown:   teardown callback function
  32  *
  33  * Installs the callback functions and invokes the startup callback on
  34  * the present cpus which have already reached the @state.
  35  */
  36 static inline int cpuhp_setup_state(enum cpuhp_state state,
  37                                     const char *name,
  38                                     int (*startup)(unsigned int cpu),
  39                                     int (*teardown)(unsigned int cpu))
  40 {
  41         return __cpuhp_setup_state(state, name, true, startup, teardown);
  42 }
  43
  44 /**
  45  * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
  46  *                             callbacks
  47  * @state:      The state for which the calls are installed
  48  * @name:       Name of the callback.
  49  * @startup:    startup callback function
  50  * @teardown:   teardown callback function
  51  *
  52  * Same as @cpuhp_setup_state except that no calls are executed are invoked
  53  * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n.
  54  */
  55 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state,
  56                                             const char *name,
  57                                             int (*startup)(unsigned int cpu),
  58                                             int (*teardown)(unsigned int cpu))
  59 {
  60         return __cpuhp_setup_state(state, name, false, startup, teardown);
  61 }
  62
  63 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
  64
  65 /**
  66  * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown
  67  * @state:      The state for which the calls are removed
  68  *
  69  * Removes the callback functions and invokes the teardown callback on
  70  * the present cpus which have already reached the @state.
  71  */
  72 static inline void cpuhp_remove_state(enum cpuhp_state state)
  73 {
  74         __cpuhp_remove_state(state, true);
  75 }
  76
  77 /**
  78  * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking
  79  *                              teardown
  80  * @state:      The state for which the calls are removed
  81  */
  82 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
  83 {
  84         __cpuhp_remove_state(state, false);
  85 }
  86
  87 #ifdef CONFIG_SMP
  88 void cpuhp_online_idle(enum cpuhp_state state);
  89 #else
  90 static inline void cpuhp_online_idle(enum cpuhp_state state) { }
  91 #endif
  92
  93 #endif