include/linux/irq_work.h

   1 #ifndef _LINUX_IRQ_WORK_H
   2 #define _LINUX_IRQ_WORK_H
   3
   4 #include <linux/llist.h>
   5
   6 /*
   7  * An entry can be in one of four states:
   8  *
   9  * free      NULL, 0 -> {claimed}       : free to be used
  10  * claimed   NULL, 3 -> {pending}       : claimed to be enqueued
  11  * pending   next, 3 -> {busy}          : queued, pending callback
  12  * busy      NULL, 2 -> {free, claimed} : callback in progress, can be claimed
  13  */
  14
  15 #define IRQ_WORK_PENDING        1UL
  16 #define IRQ_WORK_BUSY           2UL
  17 #define IRQ_WORK_FLAGS          3UL
  18 #define IRQ_WORK_LAZY           4UL /* Doesn't want IPI, wait for tick */
  19
  20 struct irq_work {
  21         unsigned long flags;
  22         struct llist_node llnode;
  23         void (*func)(struct irq_work *);
  24 };
  25
  26 static inline
  27 void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
  28 {
  29         work->flags = 0;
  30         work->func = func;
  31 }
  32
  33 #define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { .func = (_f), }
  34
  35 bool irq_work_queue(struct irq_work *work);
  36
  37 #ifdef CONFIG_SMP
  38 bool irq_work_queue_on(struct irq_work *work, int cpu);
  39 #endif
  40
  41 void irq_work_tick(void);
  42 void irq_work_sync(struct irq_work *work);
  43
  44 #ifdef CONFIG_IRQ_WORK
  45 #include <asm/irq_work.h>
  46
  47 void irq_work_run(void);
  48 bool irq_work_needs_cpu(void);
  49 #else
  50 static inline bool irq_work_needs_cpu(void) { return false; }
  51 static inline void irq_work_run(void) { }
  52 #endif
  53
  54 #endif /* _LINUX_IRQ_WORK_H */