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_IRQ_GICV3_STARTING,
  14         CPUHP_AP_IRQ_HIP04_STARTING,
  15         CPUHP_AP_NOTIFY_STARTING,
  16         CPUHP_AP_ONLINE,
  17         CPUHP_TEARDOWN_CPU,
  18         CPUHP_AP_ONLINE_IDLE,
  19         CPUHP_AP_SMPBOOT_THREADS,
  20         CPUHP_AP_X86_VDSO_VMA_ONLINE,
  21         CPUHP_AP_NOTIFY_ONLINE,
  22         CPUHP_AP_ONLINE_DYN,
  23         CPUHP_AP_ONLINE_DYN_END         = CPUHP_AP_ONLINE_DYN + 30,
  24         CPUHP_AP_ACTIVE,
  25         CPUHP_ONLINE,
  26 };
  27
  28 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke,
  29                         int (*startup)(unsigned int cpu),
  30                         int (*teardown)(unsigned int cpu));
  31
  32 /**
  33  * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks
  34  * @state:      The state for which the calls are installed
  35  * @name:       Name of the callback (will be used in debug output)
  36  * @startup:    startup callback function
  37  * @teardown:   teardown callback function
  38  *
  39  * Installs the callback functions and invokes the startup callback on
  40  * the present cpus which have already reached the @state.
  41  */
  42 static inline int cpuhp_setup_state(enum cpuhp_state state,
  43                                     const char *name,
  44                                     int (*startup)(unsigned int cpu),
  45                                     int (*teardown)(unsigned int cpu))
  46 {
  47         return __cpuhp_setup_state(state, name, true, startup, teardown);
  48 }
  49
  50 /**
  51  * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
  52  *                             callbacks
  53  * @state:      The state for which the calls are installed
  54  * @name:       Name of the callback.
  55  * @startup:    startup callback function
  56  * @teardown:   teardown callback function
  57  *
  58  * Same as @cpuhp_setup_state except that no calls are executed are invoked
  59  * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n.
  60  */
  61 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state,
  62                                             const char *name,
  63                                             int (*startup)(unsigned int cpu),
  64                                             int (*teardown)(unsigned int cpu))
  65 {
  66         return __cpuhp_setup_state(state, name, false, startup, teardown);
  67 }
  68
  69 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
  70
  71 /**
  72  * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown
  73  * @state:      The state for which the calls are removed
  74  *
  75  * Removes the callback functions and invokes the teardown callback on
  76  * the present cpus which have already reached the @state.
  77  */
  78 static inline void cpuhp_remove_state(enum cpuhp_state state)
  79 {
  80         __cpuhp_remove_state(state, true);
  81 }
  82
  83 /**
  84  * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking
  85  *                              teardown
  86  * @state:      The state for which the calls are removed
  87  */
  88 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
  89 {
  90         __cpuhp_remove_state(state, false);
  91 }
  92
  93 #ifdef CONFIG_SMP
  94 void cpuhp_online_idle(enum cpuhp_state state);
  95 #else
  96 static inline void cpuhp_online_idle(enum cpuhp_state state) { }
  97 #endif
  98
  99 #endif