include/linux/irq_work.h

   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 /* Run hard IRQ context, even on RT */
  22 #define IRQ_WORK_HARD_IRQ       BIT(3)
  23
  24 #define IRQ_WORK_CLAIMED        (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
  25
  26 struct irq_work {
  27         atomic_t flags;
  28         struct llist_node llnode;
  29         void (*func)(struct irq_work *);
  30 };
  31
  32 static inline
  33 void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
  34 {
  35         atomic_set(&work->flags, 0);
  36         work->func = func;
  37 }
  38
  39 #define DEFINE_IRQ_WORK(name, _f) struct irq_work name = {      \
  40                 .flags = ATOMIC_INIT(0),                        \
  41                 .func  = (_f)                                   \
  42 }
  43
  44
  45 bool irq_work_queue(struct irq_work *work);
  46 bool irq_work_queue_on(struct irq_work *work, int cpu);
  47
  48 void irq_work_tick(void);
  49 void irq_work_sync(struct irq_work *work);
  50
  51 #ifdef CONFIG_IRQ_WORK
  52 #include <asm/irq_work.h>
  53
  54 void irq_work_run(void);
  55 bool irq_work_needs_cpu(void);
  56 #else
  57 static inline bool irq_work_needs_cpu(void) { return false; }
  58 static inline void irq_work_run(void) { }
  59 #endif
  60
  61 #endif /* _LINUX_IRQ_WORK_H */