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