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_SCHED_STARTING,
  12         CPUHP_AP_IRQ_GIC_STARTING,
  13         CPUHP_AP_NOTIFY_STARTING,
  14         CPUHP_AP_ONLINE,
  15         CPUHP_TEARDOWN_CPU,
  16         CPUHP_AP_ONLINE_IDLE,
  17         CPUHP_AP_SMPBOOT_THREADS,
  18         CPUHP_AP_X86_VDSO_VMA_ONLINE,
  19         CPUHP_AP_NOTIFY_ONLINE,
  20         CPUHP_AP_ONLINE_DYN,
  21         CPUHP_AP_ONLINE_DYN_END         = CPUHP_AP_ONLINE_DYN + 30,
  22         CPUHP_AP_ACTIVE,
  23         CPUHP_ONLINE,
  24 };
  25
  26 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke,
  27                         int (*startup)(unsigned int cpu),
  28                         int (*teardown)(unsigned int cpu));
  29
  30 /**
  31  * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks
  32  * @state:      The state for which the calls are installed
  33  * @name:       Name of the callback (will be used in debug output)
  34  * @startup:    startup callback function
  35  * @teardown:   teardown callback function
  36  *
  37  * Installs the callback functions and invokes the startup callback on
  38  * the present cpus which have already reached the @state.
  39  */
  40 static inline int cpuhp_setup_state(enum cpuhp_state state,
  41                                     const char *name,
  42                                     int (*startup)(unsigned int cpu),
  43                                     int (*teardown)(unsigned int cpu))
  44 {
  45         return __cpuhp_setup_state(state, name, true, startup, teardown);
  46 }
  47
  48 /**
  49  * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
  50  *                             callbacks
  51  * @state:      The state for which the calls are installed
  52  * @name:       Name of the callback.
  53  * @startup:    startup callback function
  54  * @teardown:   teardown callback function
  55  *
  56  * Same as @cpuhp_setup_state except that no calls are executed are invoked
  57  * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n.
  58  */
  59 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state,
  60                                             const char *name,
  61                                             int (*startup)(unsigned int cpu),
  62                                             int (*teardown)(unsigned int cpu))
  63 {
  64         return __cpuhp_setup_state(state, name, false, startup, teardown);
  65 }
  66
  67 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
  68
  69 /**
  70  * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown
  71  * @state:      The state for which the calls are removed
  72  *
  73  * Removes the callback functions and invokes the teardown callback on
  74  * the present cpus which have already reached the @state.
  75  */
  76 static inline void cpuhp_remove_state(enum cpuhp_state state)
  77 {
  78         __cpuhp_remove_state(state, true);
  79 }
  80
  81 /**
  82  * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking
  83  *                              teardown
  84  * @state:      The state for which the calls are removed
  85  */
  86 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
  87 {
  88         __cpuhp_remove_state(state, false);
  89 }
  90
  91 #ifdef CONFIG_SMP
  92 void cpuhp_online_idle(enum cpuhp_state state);
  93 #else
  94 static inline void cpuhp_online_idle(enum cpuhp_state state) { }
  95 #endif
  96
  97 #endif