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 24struct irq_work { 25 unsigned long flags; 26 struct llist_node llnode; 27 void (*func)(struct irq_work *); 28}; 29 30static inline 31void 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 39bool irq_work_queue(struct irq_work *work); 40bool irq_work_queue_on(struct irq_work *work, int cpu); 41 42void irq_work_tick(void); 43void irq_work_sync(struct irq_work *work); 44 45#ifdef CONFIG_IRQ_WORK 46#include <asm/irq_work.h> 47 48void irq_work_run(void); 49bool irq_work_needs_cpu(void); 50#else 51static inline bool irq_work_needs_cpu(void) { return false; } 52static inline void irq_work_run(void) { } 53#endif 54 55#endif /* _LINUX_IRQ_WORK_H */ 56