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        1UL
  17 #define IRQ_WORK_BUSY           2UL
  18 #define IRQ_WORK_FLAGS          3UL
  19 #define IRQ_WORK_LAZY           4UL /* Doesn't want IPI, wait for tick */
  20
  21 struct irq_work {
  22         unsigned long flags;
  23         struct llist_node llnode;
  24         void (*func)(struct irq_work *);
  25 };
  26
  27 static inline
  28 void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
  29 {
  30         work->flags = 0;
  31         work->func = func;
  32 }
  33
  34 #define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { .func = (_f), }
  35
  36 bool irq_work_queue(struct irq_work *work);
  37 bool irq_work_queue_on(struct irq_work *work, int cpu);
  38
  39 void irq_work_tick(void);
  40 void irq_work_sync(struct irq_work *work);
  41
  42 #ifdef CONFIG_IRQ_WORK
  43 #include <asm/irq_work.h>
  44
  45 void irq_work_run(void);
  46 bool irq_work_needs_cpu(void);
  47 #else
  48 static inline bool irq_work_needs_cpu(void) { return false; }
  49 static inline void irq_work_run(void) { }
  50 #endif
  51
  52 #endif /* _LINUX_IRQ_WORK_H */