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/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