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_IRQ_ARMADA_XP_STARTING,
  16         CPUHP_AP_IRQ_ARMADA_CASC_STARTING,
  17         CPUHP_AP_IRQ_BCM2836_STARTING,
  18         CPUHP_AP_NOTIFY_STARTING,
  19         CPUHP_AP_ONLINE,
  20         CPUHP_TEARDOWN_CPU,
  21         CPUHP_AP_ONLINE_IDLE,
  22         CPUHP_AP_SMPBOOT_THREADS,
  23         CPUHP_AP_X86_VDSO_VMA_ONLINE,
  24         CPUHP_AP_NOTIFY_ONLINE,
  25         CPUHP_AP_ONLINE_DYN,
  26         CPUHP_AP_ONLINE_DYN_END         = CPUHP_AP_ONLINE_DYN + 30,
  27         CPUHP_AP_ACTIVE,
  28         CPUHP_ONLINE,
  29 };
  30
  31 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke,
  32                         int (*startup)(unsigned int cpu),
  33                         int (*teardown)(unsigned int cpu));
  34
  35 /**
  36  * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks
  37  * @state:      The state for which the calls are installed
  38  * @name:       Name of the callback (will be used in debug output)
  39  * @startup:    startup callback function
  40  * @teardown:   teardown callback function
  41  *
  42  * Installs the callback functions and invokes the startup callback on
  43  * the present cpus which have already reached the @state.
  44  */
  45 static inline int cpuhp_setup_state(enum cpuhp_state state,
  46                                     const char *name,
  47                                     int (*startup)(unsigned int cpu),
  48                                     int (*teardown)(unsigned int cpu))
  49 {
  50         return __cpuhp_setup_state(state, name, true, startup, teardown);
  51 }
  52
  53 /**
  54  * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
  55  *                             callbacks
  56  * @state:      The state for which the calls are installed
  57  * @name:       Name of the callback.
  58  * @startup:    startup callback function
  59  * @teardown:   teardown callback function
  60  *
  61  * Same as @cpuhp_setup_state except that no calls are executed are invoked
  62  * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n.
  63  */
  64 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state,
  65                                             const char *name,
  66                                             int (*startup)(unsigned int cpu),
  67                                             int (*teardown)(unsigned int cpu))
  68 {
  69         return __cpuhp_setup_state(state, name, false, startup, teardown);
  70 }
  71
  72 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
  73
  74 /**
  75  * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown
  76  * @state:      The state for which the calls are removed
  77  *
  78  * Removes the callback functions and invokes the teardown callback on
  79  * the present cpus which have already reached the @state.
  80  */
  81 static inline void cpuhp_remove_state(enum cpuhp_state state)
  82 {
  83         __cpuhp_remove_state(state, true);
  84 }
  85
  86 /**
  87  * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking
  88  *                              teardown
  89  * @state:      The state for which the calls are removed
  90  */
  91 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
  92 {
  93         __cpuhp_remove_state(state, false);
  94 }
  95
  96 #ifdef CONFIG_SMP
  97 void cpuhp_online_idle(enum cpuhp_state state);
  98 #else
  99 static inline void cpuhp_online_idle(enum cpuhp_state state) { }
 100 #endif
 101
 102 #endif