Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_IRQ_WORK_H
3#define _LINUX_IRQ_WORK_H
4
5#include <linux/llist.h>
6
7/*
8 * An entry can be in one of four states:
9 *
10 * free NULL, 0 -> {claimed} : free to be used
11 * claimed NULL, 3 -> {pending} : claimed to be enqueued
12 * pending next, 3 -> {busy} : queued, pending callback
13 * busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed
14 */
15
16#define IRQ_WORK_PENDING BIT(0)
17#define IRQ_WORK_BUSY BIT(1)
18
19/* Doesn't want IPI, wait for tick: */
20#define IRQ_WORK_LAZY BIT(2)
21/* Run hard IRQ context, even on RT */
22#define IRQ_WORK_HARD_IRQ BIT(3)
23
24#define IRQ_WORK_CLAIMED (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
25
26struct irq_work {
27 atomic_t flags;
28 struct llist_node llnode;
29 void (*func)(struct irq_work *);
30};
31
32static inline
33void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
34{
35 atomic_set(&work->flags, 0);
36 work->func = func;
37}
38
39#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { \
40 .flags = ATOMIC_INIT(0), \
41 .func = (_f) \
42}
43
44
45bool irq_work_queue(struct irq_work *work);
46bool irq_work_queue_on(struct irq_work *work, int cpu);
47
48void irq_work_tick(void);
49void irq_work_sync(struct irq_work *work);
50
51#ifdef CONFIG_IRQ_WORK
52#include <asm/irq_work.h>
53
54void irq_work_run(void);
55bool irq_work_needs_cpu(void);
56#else
57static inline bool irq_work_needs_cpu(void) { return false; }
58static inline void irq_work_run(void) { }
59#endif
60
61#endif /* _LINUX_IRQ_WORK_H */