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
22#define IRQ_WORK_CLAIMED (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
23
24struct irq_work {
25 unsigned long flags;
26 struct llist_node llnode;
27 void (*func)(struct irq_work *);
28};
29
30static inline
31void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
32{
33 work->flags = 0;
34 work->func = func;
35}
36
37#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { .func = (_f), }
38
39bool irq_work_queue(struct irq_work *work);
40bool irq_work_queue_on(struct irq_work *work, int cpu);
41
42void irq_work_tick(void);
43void irq_work_sync(struct irq_work *work);
44
45#ifdef CONFIG_IRQ_WORK
46#include <asm/irq_work.h>
47
48void irq_work_run(void);
49bool irq_work_needs_cpu(void);
50#else
51static inline bool irq_work_needs_cpu(void) { return false; }
52static inline void irq_work_run(void) { }
53#endif
54
55#endif /* _LINUX_IRQ_WORK_H */
56