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_PERF_PREPARE,
   8         CPUHP_PERF_X86_PREPARE,
   9         CPUHP_NOTIFY_PREPARE,
  10         CPUHP_BRINGUP_CPU,
  11         CPUHP_AP_IDLE_DEAD,
  12         CPUHP_AP_OFFLINE,
  13         CPUHP_AP_SCHED_STARTING,
  14         CPUHP_AP_IRQ_GIC_STARTING,
  15         CPUHP_AP_IRQ_GICV3_STARTING,
  16         CPUHP_AP_IRQ_HIP04_STARTING,
  17         CPUHP_AP_IRQ_ARMADA_XP_STARTING,
  18         CPUHP_AP_IRQ_ARMADA_CASC_STARTING,
  19         CPUHP_AP_IRQ_BCM2836_STARTING,
  20         CPUHP_AP_ARM_MVEBU_COHERENCY,
  21         CPUHP_AP_PERF_X86_STARTING,
  22         CPUHP_AP_NOTIFY_STARTING,
  23         CPUHP_AP_ONLINE,
  24         CPUHP_TEARDOWN_CPU,
  25         CPUHP_AP_ONLINE_IDLE,
  26         CPUHP_AP_SMPBOOT_THREADS,
  27         CPUHP_AP_X86_VDSO_VMA_ONLINE,
  28         CPUHP_AP_PERF_ONLINE,
  29         CPUHP_AP_PERF_X86_ONLINE,
  30         CPUHP_AP_NOTIFY_ONLINE,
  31         CPUHP_AP_ONLINE_DYN,
  32         CPUHP_AP_ONLINE_DYN_END         = CPUHP_AP_ONLINE_DYN + 30,
  33         CPUHP_AP_ACTIVE,
  34         CPUHP_ONLINE,
  35 };
  36
  37 int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke,
  38                         int (*startup)(unsigned int cpu),
  39                         int (*teardown)(unsigned int cpu));
  40
  41 /**
  42  * cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks
  43  * @state:      The state for which the calls are installed
  44  * @name:       Name of the callback (will be used in debug output)
  45  * @startup:    startup callback function
  46  * @teardown:   teardown callback function
  47  *
  48  * Installs the callback functions and invokes the startup callback on
  49  * the present cpus which have already reached the @state.
  50  */
  51 static inline int cpuhp_setup_state(enum cpuhp_state state,
  52                                     const char *name,
  53                                     int (*startup)(unsigned int cpu),
  54                                     int (*teardown)(unsigned int cpu))
  55 {
  56         return __cpuhp_setup_state(state, name, true, startup, teardown);
  57 }
  58
  59 /**
  60  * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
  61  *                             callbacks
  62  * @state:      The state for which the calls are installed
  63  * @name:       Name of the callback.
  64  * @startup:    startup callback function
  65  * @teardown:   teardown callback function
  66  *
  67  * Same as @cpuhp_setup_state except that no calls are executed are invoked
  68  * during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n.
  69  */
  70 static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state,
  71                                             const char *name,
  72                                             int (*startup)(unsigned int cpu),
  73                                             int (*teardown)(unsigned int cpu))
  74 {
  75         return __cpuhp_setup_state(state, name, false, startup, teardown);
  76 }
  77
  78 void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
  79
  80 /**
  81  * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown
  82  * @state:      The state for which the calls are removed
  83  *
  84  * Removes the callback functions and invokes the teardown callback on
  85  * the present cpus which have already reached the @state.
  86  */
  87 static inline void cpuhp_remove_state(enum cpuhp_state state)
  88 {
  89         __cpuhp_remove_state(state, true);
  90 }
  91
  92 /**
  93  * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking
  94  *                              teardown
  95  * @state:      The state for which the calls are removed
  96  */
  97 static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
  98 {
  99         __cpuhp_remove_state(state, false);
 100 }
 101
 102 #ifdef CONFIG_SMP
 103 void cpuhp_online_idle(enum cpuhp_state state);
 104 #else
 105 static inline void cpuhp_online_idle(enum cpuhp_state state) { }
 106 #endif
 107
 108 #endif