soundwire: cadence: further simplify low-level xfer_msg_defer() callback
[linux-block.git] / kernel / workqueue_internal.h
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b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
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2/*
3 * kernel/workqueue_internal.h
4 *
5 * Workqueue internal header file. Only to be included by workqueue and
6 * core kernel subsystems.
7 */
8#ifndef _KERNEL_WORKQUEUE_INTERNAL_H
9#define _KERNEL_WORKQUEUE_INTERNAL_H
10
2eaebdb3 11#include <linux/workqueue.h>
84b233ad 12#include <linux/kthread.h>
cef572ad 13#include <linux/preempt.h>
2eaebdb3 14
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15struct worker_pool;
16
17/*
18 * The poor guys doing the actual heavy lifting. All on-duty workers are
19 * either serving the manager role, on idle list or on busy hash. For
20 * details on the locking annotation (L, I, X...), refer to workqueue.c.
21 *
22 * Only to be used in workqueue and async.
23 */
24struct worker {
25 /* on idle list while idle, on busy hash table while busy */
26 union {
27 struct list_head entry; /* L: while idle */
28 struct hlist_node hentry; /* L: while busy */
29 };
30
31 struct work_struct *current_work; /* L: work being processed */
32 work_func_t current_func; /* L: current_work's fn */
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33 struct pool_workqueue *current_pwq; /* L: current_work's pwq */
34 unsigned int current_color; /* L: current_work's color */
2eaebdb3 35 struct list_head scheduled; /* L: scheduled works */
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36
37 /* 64 bytes boundary on 64bit, 32 on 32bit */
38
2eaebdb3 39 struct task_struct *task; /* I: worker task */
a2d812a2 40 struct worker_pool *pool; /* A: the associated pool */
b3104104 41 /* L: for rescuers */
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42 struct list_head node; /* A: anchored at pool->workers */
43 /* A: runs through worker->node */
3d1cb205 44
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45 unsigned long last_active; /* L: last active timestamp */
46 unsigned int flags; /* X: flags */
47 int id; /* I: worker id */
6d25be57 48 int sleeping; /* None */
2eaebdb3 49
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50 /*
51 * Opaque string set with work_set_desc(). Printed out with task
52 * dump for debugging - WARN, BUG, panic or sysrq.
53 */
54 char desc[WORKER_DESC_LEN];
55
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56 /* used only by rescuers to point to the target workqueue */
57 struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */
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58
59 /* used by the scheduler to determine a worker's last known identity */
60 work_func_t last_func;
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61};
62
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63/**
64 * current_wq_worker - return struct worker if %current is a workqueue worker
65 */
66static inline struct worker *current_wq_worker(void)
67{
cef572ad 68 if (in_task() && (current->flags & PF_WQ_WORKER))
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69 return kthread_data(current);
70 return NULL;
71}
72
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73/*
74 * Scheduler hooks for concurrency managed workqueue. Only to be used from
1b69ac6b 75 * sched/ and workqueue.c.
ea138446 76 */
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77void wq_worker_running(struct task_struct *task);
78void wq_worker_sleeping(struct task_struct *task);
1b69ac6b 79work_func_t wq_worker_last_func(struct task_struct *task);
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80
81#endif /* _KERNEL_WORKQUEUE_INTERNAL_H */