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        struct __call_single_node node;
  18        void (*func)(struct irq_work *);
  19};
  20
  21#define __IRQ_WORK_INIT(_func, _flags) (struct irq_work){       \
  22        .node = { .u_flags = (_flags), },                       \
  23        .func = (_func),                                        \
  24}
  25
  26#define IRQ_WORK_INIT(_func) __IRQ_WORK_INIT(_func, 0)
  27#define IRQ_WORK_INIT_LAZY(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_LAZY)
  28#define IRQ_WORK_INIT_HARD(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_HARD_IRQ)
  29
  30#define DEFINE_IRQ_WORK(name, _f)                               \
  31        struct irq_work name = IRQ_WORK_INIT(_f)
  32
  33static inline
  34void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
  35{
  36        *work = IRQ_WORK_INIT(func);
  37}
  38
  39static inline bool irq_work_is_pending(struct irq_work *work)
  40{
  41        return atomic_read(&work->node.a_flags) & IRQ_WORK_PENDING;
  42}
  43
  44static inline bool irq_work_is_busy(struct irq_work *work)
  45{
  46        return atomic_read(&work->node.a_flags) & IRQ_WORK_BUSY;
  47}
  48
  49bool irq_work_queue(struct irq_work *work);
  50bool irq_work_queue_on(struct irq_work *work, int cpu);
  51
  52void irq_work_tick(void);
  53void irq_work_sync(struct irq_work *work);
  54
  55#ifdef CONFIG_IRQ_WORK
  56#include <asm/irq_work.h>
  57
  58void irq_work_run(void);
  59bool irq_work_needs_cpu(void);
  60void irq_work_single(void *arg);
  61#else
  62static inline bool irq_work_needs_cpu(void) { return false; }
  63static inline void irq_work_run(void) { }
  64static inline void irq_work_single(void *arg) { }
  65#endif
  66
  67#endif /* _LINUX_IRQ_WORK_H */
  68