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
50