include/linux/smpboot.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_SMPBOOT_H
   3 #define _LINUX_SMPBOOT_H
   4
   5 #include <linux/types.h>
   6
   7 struct task_struct;
   8 /* Cookie handed to the thread_fn*/
   9 struct smpboot_thread_data;
  10
  11 /**
  12  * struct smp_hotplug_thread - CPU hotplug related thread descriptor
  13  * @store:              Pointer to per cpu storage for the task pointers
  14  * @list:               List head for core management
  15  * @thread_should_run:  Check whether the thread should run or not. Called with
  16  *                      preemption disabled.
  17  * @thread_fn:          The associated thread function
  18  * @create:             Optional setup function, called when the thread gets
  19  *                      created (Not called from the thread context)
  20  * @setup:              Optional setup function, called when the thread gets
  21  *                      operational the first time
  22  * @cleanup:            Optional cleanup function, called when the thread
  23  *                      should stop (module exit)
  24  * @park:               Optional park function, called when the thread is
  25  *                      parked (cpu offline)
  26  * @unpark:             Optional unpark function, called when the thread is
  27  *                      unparked (cpu online)
  28  * @selfparking:        Thread is not parked by the park function.
  29  * @thread_comm:        The base name of the thread
  30  */
  31 struct smp_hotplug_thread {
  32         struct task_struct __percpu     **store;
  33         struct list_head                list;
  34         int                             (*thread_should_run)(unsigned int cpu);
  35         void                            (*thread_fn)(unsigned int cpu);
  36         void                            (*create)(unsigned int cpu);
  37         void                            (*setup)(unsigned int cpu);
  38         void                            (*cleanup)(unsigned int cpu, bool online);
  39         void                            (*park)(unsigned int cpu);
  40         void                            (*unpark)(unsigned int cpu);
  41         bool                            selfparking;
  42         const char                      *thread_comm;
  43 };
  44
  45 int smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread);
  46
  47 void smpboot_unregister_percpu_thread(struct smp_hotplug_thread *plug_thread);
  48
  49 #endif