LXR linux/include/linux/irq

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_IRQ_WORK_H
   3#define _LINUX_IRQ_WORK_H
   4
   5#include <linux/smp_types.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
  16struct irq_work {
  17        union {
  18                struct __call_single_node node;
  19                struct {
  20                        struct llist_node llnode;
  21                        atomic_t flags;
  22                };
  23        };
  24        void (*func)(struct irq_work *);
  25};
  26
  27static inline
  28void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
  29{
  30        atomic_set(&work->flags, 0);
  31        work->func = func;
  32}
  33
  34#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = {      \
  35                .flags = ATOMIC_INIT(0),                        \
  36                .func  = (_f)                                   \
  37}
  38
  39
  40bool irq_work_queue(struct irq_work *work);
  41bool irq_work_queue_on(struct irq_work *work, int cpu);
  42
  43void irq_work_tick(void);
  44void irq_work_sync(struct irq_work *work);
  45
  46#ifdef CONFIG_IRQ_WORK
  47#include <asm/irq_work.h>
  48
  49void irq_work_run(void);
  50bool irq_work_needs_cpu(void);
  51void irq_work_single(void *arg);
  52#else
  53static inline bool irq_work_needs_cpu(void) { return false; }
  54static inline void irq_work_run(void) { }
  55static inline void irq_work_single(void *arg) { }
  56#endif
  57
  58#endif /* _LINUX_IRQ_WORK_H */
  59