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1da177e4 LT |
1 | #ifndef _LINUX_KTHREAD_H |
2 | #define _LINUX_KTHREAD_H | |
3 | /* Simple interface for creating and stopping kernel threads without mess. */ | |
4 | #include <linux/err.h> | |
5 | #include <linux/sched.h> | |
6 | ||
b9075fa9 | 7 | __printf(4, 5) |
207205a2 ED |
8 | struct task_struct *kthread_create_on_node(int (*threadfn)(void *data), |
9 | void *data, | |
10 | int node, | |
b9075fa9 | 11 | const char namefmt[], ...); |
207205a2 | 12 | |
e154ccc8 JC |
13 | /** |
14 | * kthread_create - create a kthread on the current node | |
15 | * @threadfn: the function to run in the thread | |
16 | * @data: data pointer for @threadfn() | |
17 | * @namefmt: printf-style format string for the thread name | |
18 | * @...: arguments for @namefmt. | |
19 | * | |
20 | * This macro will create a kthread on the current node, leaving it in | |
21 | * the stopped state. This is just a helper for kthread_create_on_node(); | |
22 | * see the documentation there for more details. | |
23 | */ | |
207205a2 | 24 | #define kthread_create(threadfn, data, namefmt, arg...) \ |
e9f06986 | 25 | kthread_create_on_node(threadfn, data, NUMA_NO_NODE, namefmt, ##arg) |
207205a2 | 26 | |
1da177e4 | 27 | |
2a1d4460 TG |
28 | struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data), |
29 | void *data, | |
30 | unsigned int cpu, | |
31 | const char *namefmt); | |
32 | ||
1da177e4 | 33 | /** |
9e37bd30 | 34 | * kthread_run - create and wake a thread. |
1da177e4 LT |
35 | * @threadfn: the function to run until signal_pending(current). |
36 | * @data: data ptr for @threadfn. | |
37 | * @namefmt: printf-style name for the thread. | |
38 | * | |
39 | * Description: Convenient wrapper for kthread_create() followed by | |
9e37bd30 RD |
40 | * wake_up_process(). Returns the kthread or ERR_PTR(-ENOMEM). |
41 | */ | |
1da177e4 LT |
42 | #define kthread_run(threadfn, data, namefmt, ...) \ |
43 | ({ \ | |
44 | struct task_struct *__k \ | |
45 | = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \ | |
46 | if (!IS_ERR(__k)) \ | |
47 | wake_up_process(__k); \ | |
48 | __k; \ | |
49 | }) | |
50 | ||
1da177e4 | 51 | void kthread_bind(struct task_struct *k, unsigned int cpu); |
25834c73 | 52 | void kthread_bind_mask(struct task_struct *k, const struct cpumask *mask); |
1da177e4 | 53 | int kthread_stop(struct task_struct *k); |
2a1d4460 TG |
54 | bool kthread_should_stop(void); |
55 | bool kthread_should_park(void); | |
8a32c441 | 56 | bool kthread_freezable_should_stop(bool *was_frozen); |
82805ab7 | 57 | void *kthread_data(struct task_struct *k); |
e700591a | 58 | void *kthread_probe_data(struct task_struct *k); |
2a1d4460 TG |
59 | int kthread_park(struct task_struct *k); |
60 | void kthread_unpark(struct task_struct *k); | |
61 | void kthread_parkme(void); | |
1da177e4 | 62 | |
73c27992 EB |
63 | int kthreadd(void *unused); |
64 | extern struct task_struct *kthreadd_task; | |
207205a2 | 65 | extern int tsk_fork_get_node(struct task_struct *tsk); |
73c27992 | 66 | |
b56c0d89 TH |
67 | /* |
68 | * Simple work processor based on kthread. | |
69 | * | |
70 | * This provides easier way to make use of kthreads. A kthread_work | |
3989144f | 71 | * can be queued and flushed using queue/kthread_flush_work() |
b56c0d89 TH |
72 | * respectively. Queued kthread_works are processed by a kthread |
73 | * running kthread_worker_fn(). | |
b56c0d89 TH |
74 | */ |
75 | struct kthread_work; | |
76 | typedef void (*kthread_work_func_t)(struct kthread_work *work); | |
22597dc3 | 77 | void kthread_delayed_work_timer_fn(unsigned long __data); |
b56c0d89 | 78 | |
dbf52682 PM |
79 | enum { |
80 | KTW_FREEZABLE = 1 << 0, /* freeze during suspend */ | |
81 | }; | |
82 | ||
b56c0d89 | 83 | struct kthread_worker { |
dbf52682 | 84 | unsigned int flags; |
b56c0d89 TH |
85 | spinlock_t lock; |
86 | struct list_head work_list; | |
22597dc3 | 87 | struct list_head delayed_work_list; |
b56c0d89 | 88 | struct task_struct *task; |
46f3d976 | 89 | struct kthread_work *current_work; |
b56c0d89 TH |
90 | }; |
91 | ||
92 | struct kthread_work { | |
93 | struct list_head node; | |
94 | kthread_work_func_t func; | |
46f3d976 | 95 | struct kthread_worker *worker; |
37be45d4 PM |
96 | /* Number of canceling calls that are running at the moment. */ |
97 | int canceling; | |
b56c0d89 TH |
98 | }; |
99 | ||
22597dc3 PM |
100 | struct kthread_delayed_work { |
101 | struct kthread_work work; | |
102 | struct timer_list timer; | |
103 | }; | |
104 | ||
b56c0d89 | 105 | #define KTHREAD_WORKER_INIT(worker) { \ |
92578c0b | 106 | .lock = __SPIN_LOCK_UNLOCKED((worker).lock), \ |
b56c0d89 | 107 | .work_list = LIST_HEAD_INIT((worker).work_list), \ |
22597dc3 | 108 | .delayed_work_list = LIST_HEAD_INIT((worker).delayed_work_list),\ |
b56c0d89 TH |
109 | } |
110 | ||
111 | #define KTHREAD_WORK_INIT(work, fn) { \ | |
112 | .node = LIST_HEAD_INIT((work).node), \ | |
113 | .func = (fn), \ | |
b56c0d89 TH |
114 | } |
115 | ||
22597dc3 PM |
116 | #define KTHREAD_DELAYED_WORK_INIT(dwork, fn) { \ |
117 | .work = KTHREAD_WORK_INIT((dwork).work, (fn)), \ | |
118 | .timer = __TIMER_INITIALIZER(kthread_delayed_work_timer_fn, \ | |
119 | 0, (unsigned long)&(dwork), \ | |
120 | TIMER_IRQSAFE), \ | |
121 | } | |
122 | ||
b56c0d89 TH |
123 | #define DEFINE_KTHREAD_WORKER(worker) \ |
124 | struct kthread_worker worker = KTHREAD_WORKER_INIT(worker) | |
125 | ||
126 | #define DEFINE_KTHREAD_WORK(work, fn) \ | |
127 | struct kthread_work work = KTHREAD_WORK_INIT(work, fn) | |
128 | ||
22597dc3 PM |
129 | #define DEFINE_KTHREAD_DELAYED_WORK(dwork, fn) \ |
130 | struct kthread_delayed_work dwork = \ | |
131 | KTHREAD_DELAYED_WORK_INIT(dwork, fn) | |
132 | ||
4f32e9b1 | 133 | /* |
95847e1b LJ |
134 | * kthread_worker.lock needs its own lockdep class key when defined on |
135 | * stack with lockdep enabled. Use the following macros in such cases. | |
4f32e9b1 YZ |
136 | */ |
137 | #ifdef CONFIG_LOCKDEP | |
138 | # define KTHREAD_WORKER_INIT_ONSTACK(worker) \ | |
3989144f | 139 | ({ kthread_init_worker(&worker); worker; }) |
4f32e9b1 YZ |
140 | # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) \ |
141 | struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker) | |
4f32e9b1 YZ |
142 | #else |
143 | # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker) | |
4f32e9b1 YZ |
144 | #endif |
145 | ||
3989144f | 146 | extern void __kthread_init_worker(struct kthread_worker *worker, |
4f32e9b1 YZ |
147 | const char *name, struct lock_class_key *key); |
148 | ||
3989144f | 149 | #define kthread_init_worker(worker) \ |
4f32e9b1 YZ |
150 | do { \ |
151 | static struct lock_class_key __key; \ | |
3989144f | 152 | __kthread_init_worker((worker), "("#worker")->lock", &__key); \ |
4f32e9b1 YZ |
153 | } while (0) |
154 | ||
3989144f | 155 | #define kthread_init_work(work, fn) \ |
4f32e9b1 YZ |
156 | do { \ |
157 | memset((work), 0, sizeof(struct kthread_work)); \ | |
158 | INIT_LIST_HEAD(&(work)->node); \ | |
159 | (work)->func = (fn); \ | |
4f32e9b1 | 160 | } while (0) |
b56c0d89 | 161 | |
22597dc3 PM |
162 | #define kthread_init_delayed_work(dwork, fn) \ |
163 | do { \ | |
164 | kthread_init_work(&(dwork)->work, (fn)); \ | |
165 | __setup_timer(&(dwork)->timer, \ | |
166 | kthread_delayed_work_timer_fn, \ | |
167 | (unsigned long)(dwork), \ | |
168 | TIMER_IRQSAFE); \ | |
169 | } while (0) | |
170 | ||
b56c0d89 TH |
171 | int kthread_worker_fn(void *worker_ptr); |
172 | ||
dbf52682 | 173 | __printf(2, 3) |
fbae2d44 | 174 | struct kthread_worker * |
dbf52682 | 175 | kthread_create_worker(unsigned int flags, const char namefmt[], ...); |
fbae2d44 PM |
176 | |
177 | struct kthread_worker * | |
dbf52682 PM |
178 | kthread_create_worker_on_cpu(int cpu, unsigned int flags, |
179 | const char namefmt[], ...); | |
fbae2d44 | 180 | |
3989144f | 181 | bool kthread_queue_work(struct kthread_worker *worker, |
b56c0d89 | 182 | struct kthread_work *work); |
22597dc3 PM |
183 | |
184 | bool kthread_queue_delayed_work(struct kthread_worker *worker, | |
185 | struct kthread_delayed_work *dwork, | |
186 | unsigned long delay); | |
187 | ||
9a6b06c8 PM |
188 | bool kthread_mod_delayed_work(struct kthread_worker *worker, |
189 | struct kthread_delayed_work *dwork, | |
190 | unsigned long delay); | |
191 | ||
3989144f PM |
192 | void kthread_flush_work(struct kthread_work *work); |
193 | void kthread_flush_worker(struct kthread_worker *worker); | |
b56c0d89 | 194 | |
37be45d4 PM |
195 | bool kthread_cancel_work_sync(struct kthread_work *work); |
196 | bool kthread_cancel_delayed_work_sync(struct kthread_delayed_work *work); | |
197 | ||
35033fe9 PM |
198 | void kthread_destroy_worker(struct kthread_worker *worker); |
199 | ||
1da177e4 | 200 | #endif /* _LINUX_KTHREAD_H */ |