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