Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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/* flags share CSD_FLAG_ space */
17
18#define IRQ_WORK_PENDING BIT(0)
19#define IRQ_WORK_BUSY BIT(1)
20
21/* Doesn't want IPI, wait for tick: */
22#define IRQ_WORK_LAZY BIT(2)
23/* Run hard IRQ context, even on RT */
24#define IRQ_WORK_HARD_IRQ BIT(3)
25
26#define IRQ_WORK_CLAIMED (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
27
28/*
29 * structure shares layout with single_call_data_t.
30 */
31struct irq_work {
32 struct llist_node llnode;
33 atomic_t flags;
34 void (*func)(struct irq_work *);
35};
36
37static inline
38void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
39{
40 atomic_set(&work->flags, 0);
41 work->func = func;
42}
43
44#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { \
45 .flags = ATOMIC_INIT(0), \
46 .func = (_f) \
47}
48
49
50bool irq_work_queue(struct irq_work *work);
51bool irq_work_queue_on(struct irq_work *work, int cpu);
52
53void irq_work_tick(void);
54void irq_work_sync(struct irq_work *work);
55
56#ifdef CONFIG_IRQ_WORK
57#include <asm/irq_work.h>
58
59void irq_work_run(void);
60bool irq_work_needs_cpu(void);
61void irq_work_single(void *arg);
62#else
63static inline bool irq_work_needs_cpu(void) { return false; }
64static inline void irq_work_run(void) { }
65static inline void irq_work_single(void *arg) { }
66#endif
67
68#endif /* _LINUX_IRQ_WORK_H */