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 */ 53