irq_work.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _LINUX_IRQ_WORK_H
 3#define _LINUX_IRQ_WORK_H
 4
 5#include <linux/irq_work_types.h>
 6#include <linux/rcuwait.h>
 7#include <linux/smp_types.h>
 8
 9/*
10 * An entry can be in one of four states:
11 *
12 * free	     NULL, 0 -> {claimed}       : free to be used
13 * claimed   NULL, 3 -> {pending}       : claimed to be enqueued
14 * pending   next, 3 -> {busy}          : queued, pending callback
15 * busy      NULL, 2 -> {free, claimed} : callback in progress, can be claimed
16 */
17
18#define __IRQ_WORK_INIT(_func, _flags) (struct irq_work){	\
19	.node = { .u_flags = (_flags), },			\
20	.func = (_func),					\
21	.irqwait = __RCUWAIT_INITIALIZER(irqwait),		\
22}
23
24#define IRQ_WORK_INIT(_func) __IRQ_WORK_INIT(_func, 0)
25#define IRQ_WORK_INIT_LAZY(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_LAZY)
26#define IRQ_WORK_INIT_HARD(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_HARD_IRQ)
27
28#define DEFINE_IRQ_WORK(name, _f)				\
29	struct irq_work name = IRQ_WORK_INIT(_f)
30
31static inline
32void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
33{
34	*work = IRQ_WORK_INIT(func);
35}
36
37static inline bool irq_work_is_pending(struct irq_work *work)
38{
39	return atomic_read(&work->node.a_flags) & IRQ_WORK_PENDING;
40}
41
42static inline bool irq_work_is_busy(struct irq_work *work)
43{
44	return atomic_read(&work->node.a_flags) & IRQ_WORK_BUSY;
45}
46
47static inline bool irq_work_is_hard(struct irq_work *work)
48{
49	return atomic_read(&work->node.a_flags) & IRQ_WORK_HARD_IRQ;
50}
51
52bool irq_work_queue(struct irq_work *work);
53bool irq_work_queue_on(struct irq_work *work, int cpu);
54
55void irq_work_tick(void);
56void irq_work_sync(struct irq_work *work);
57
58#ifdef CONFIG_IRQ_WORK
59#include <asm/irq_work.h>
60
61void irq_work_run(void);
62bool irq_work_needs_cpu(void);
63void irq_work_single(void *arg);
64
65void arch_irq_work_raise(void);
66
67#else
68static inline bool irq_work_needs_cpu(void) { return false; }
69static inline void irq_work_run(void) { }
70static inline void irq_work_single(void *arg) { }
71#endif
72
73#endif /* _LINUX_IRQ_WORK_H */