1 #ifndef _LINUX_SMPBOOT_H
2 #define _LINUX_SMPBOOT_H
3
4 #include <linux/types.h>
5
6 struct task_struct;
7 /* Cookie handed to the thread_fn*/
8 struct smpboot_thread_data;
9
10 /**
11 * struct smp_hotplug_thread - CPU hotplug related thread descriptor
12 * @store: Pointer to per cpu storage for the task pointers
13 * @list: List head for core management
14 * @thread_should_run: Check whether the thread should run or not. Called with
15 * preemption disabled.
16 * @thread_fn: The associated thread function
17 * @create: Optional setup function, called when the thread gets
18 * created (Not called from the thread context)
19 * @setup: Optional setup function, called when the thread gets
20 * operational the first time
21 * @cleanup: Optional cleanup function, called when the thread
22 * should stop (module exit)
23 * @park: Optional park function, called when the thread is
24 * parked (cpu offline)
25 * @unpark: Optional unpark function, called when the thread is
26 * unparked (cpu online)
27 * @cpumask: Internal state. To update which threads are unparked,
28 * call smpboot_update_cpumask_percpu_thread().
29 * @selfparking: Thread is not parked by the park function.
30 * @thread_comm: The base name of the thread
31 */
32 struct smp_hotplug_thread {
33 struct task_struct __percpu **store;
34 struct list_head list;
35 int (*thread_should_run)(unsigned int cpu);
36 void (*thread_fn)(unsigned int cpu);
37 void (*create)(unsigned int cpu);
38 void (*setup)(unsigned int cpu);
39 void (*cleanup)(unsigned int cpu, bool online);
40 void (*park)(unsigned int cpu);
41 void (*unpark)(unsigned int cpu);
42 cpumask_var_t cpumask;
43 bool selfparking;
44 const char *thread_comm;
45 };
46
47 int smpboot_register_percpu_thread_cpumask(struct smp_hotplug_thread *plug_thread,
48 const struct cpumask *cpumask);
49
50 static inline int
smpboot_register_percpu_thread(struct smp_hotplug_thread * plug_thread)51 smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread)
52 {
53 return smpboot_register_percpu_thread_cpumask(plug_thread,
54 cpu_possible_mask);
55 }
56
57 void smpboot_unregister_percpu_thread(struct smp_hotplug_thread *plug_thread);
58 int smpboot_update_cpumask_percpu_thread(struct smp_hotplug_thread *plug_thread,
59 const struct cpumask *);
60
61 #endif
62