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 20struct irq_work { 21 unsigned long flags; 22 struct llist_node llnode; 23 void (*func)(struct irq_work *); 24}; 25 26static inline 27void 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 35bool irq_work_queue(struct irq_work *work); 36 37#ifdef CONFIG_SMP 38bool irq_work_queue_on(struct irq_work *work, int cpu); 39#endif 40 41void irq_work_tick(void); 42void irq_work_sync(struct irq_work *work); 43 44#ifdef CONFIG_IRQ_WORK 45#include <asm/irq_work.h> 46 47void irq_work_run(void); 48bool irq_work_needs_cpu(void); 49#else 50static inline bool irq_work_needs_cpu(void) { return false; } 51static inline void irq_work_run(void) { } 52#endif 53 54#endif /* _LINUX_IRQ_WORK_H */ 55