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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_SMPBOOT_H
3#define _LINUX_SMPBOOT_H
4
5#include <linux/types.h>
6
7struct task_struct;
8/* Cookie handed to the thread_fn*/
9struct 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 * @cpumask: Internal state. To update which threads are unparked,
29 * call smpboot_update_cpumask_percpu_thread().
30 * @selfparking: Thread is not parked by the park function.
31 * @thread_comm: The base name of the thread
32 */
33struct smp_hotplug_thread {
34 struct task_struct __percpu **store;
35 struct list_head list;
36 int (*thread_should_run)(unsigned int cpu);
37 void (*thread_fn)(unsigned int cpu);
38 void (*create)(unsigned int cpu);
39 void (*setup)(unsigned int cpu);
40 void (*cleanup)(unsigned int cpu, bool online);
41 void (*park)(unsigned int cpu);
42 void (*unpark)(unsigned int cpu);
43 cpumask_var_t cpumask;
44 bool selfparking;
45 const char *thread_comm;
46};
47
48int smpboot_register_percpu_thread_cpumask(struct smp_hotplug_thread *plug_thread,
49 const struct cpumask *cpumask);
50
51static inline int
52smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread)
53{
54 return smpboot_register_percpu_thread_cpumask(plug_thread,
55 cpu_possible_mask);
56}
57
58void smpboot_unregister_percpu_thread(struct smp_hotplug_thread *plug_thread);
59void smpboot_update_cpumask_percpu_thread(struct smp_hotplug_thread *plug_thread,
60 const struct cpumask *);
61
62#endif