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