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 /* Run hard IRQ context, even on RT */ 22 #define IRQ_WORK_HARD_IRQ BIT(3) 23 24 #define IRQ_WORK_CLAIMED (IRQ_WORK_PENDING | IRQ_WORK_BUSY) 25 26 struct irq_work { 27 atomic_t flags; 28 struct llist_node llnode; 29 void (*func)(struct irq_work *); 30 }; 31 32 static inline 33 void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *)) 34 { 35 atomic_set(&work->flags, 0); 36 work->func = func; 37 } 38 39 #define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { \ 40 .flags = ATOMIC_INIT(0), \ 41 .func = (_f) \ 42 } 43 44 45 bool irq_work_queue(struct irq_work *work); 46 bool irq_work_queue_on(struct irq_work *work, int cpu); 47 48 void irq_work_tick(void); 49 void irq_work_sync(struct irq_work *work); 50 51 #ifdef CONFIG_IRQ_WORK 52 #include <asm/irq_work.h> 53 54 void irq_work_run(void); 55 bool irq_work_needs_cpu(void); 56 #else 57 static inline bool irq_work_needs_cpu(void) { return false; } 58 static inline void irq_work_run(void) { } 59 #endif 60 61 #endif /* _LINUX_IRQ_WORK_H */ 62