1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_IRQ_WORK_H 3 #define _LINUX_IRQ_WORK_H 4 5 #include <linux/smp_types.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 struct irq_work { 17 union { 18 struct __call_single_node node; 19 struct { 20 struct llist_node llnode; 21 atomic_t flags; 22 }; 23 }; 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 atomic_set(&work->flags, 0); 31 work->func = func; 32 } 33 34 #define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { \ 35 .flags = ATOMIC_INIT(0), \ 36 .func = (_f) \ 37 } 38 39 40 bool irq_work_queue(struct irq_work *work); 41 bool irq_work_queue_on(struct irq_work *work, int cpu); 42 43 void irq_work_tick(void); 44 void irq_work_sync(struct irq_work *work); 45 46 #ifdef CONFIG_IRQ_WORK 47 #include <asm/irq_work.h> 48 49 void irq_work_run(void); 50 bool irq_work_needs_cpu(void); 51 void irq_work_single(void *arg); 52 #else 53 static inline bool irq_work_needs_cpu(void) { return false; } 54 static inline void irq_work_run(void) { } 55 static inline void irq_work_single(void *arg) { } 56 #endif 57 58 #endif /* _LINUX_IRQ_WORK_H */ 59