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
  22 #define IRQ_WORK_CLAIMED        (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
  23
  24 struct irq_work {
  25         unsigned long flags;
  26         struct llist_node llnode;
  27         void (*func)(struct irq_work *);
  28 };
  29
  30 static inline
  31 void 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
  39 bool irq_work_queue(struct irq_work *work);
  40 bool irq_work_queue_on(struct irq_work *work, int cpu);
  41
  42 void irq_work_tick(void);
  43 void irq_work_sync(struct irq_work *work);
  44
  45 #ifdef CONFIG_IRQ_WORK
  46 #include <asm/irq_work.h>
  47
  48 void irq_work_run(void);
  49 bool irq_work_needs_cpu(void);
  50 #else
  51 static inline bool irq_work_needs_cpu(void) { return false; }
  52 static inline void irq_work_run(void) { }
  53 #endif
  54
  55 #endif /* _LINUX_IRQ_WORK_H */