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 struct __call_single_node node; 18 void (*func)(struct irq_work *); 19 }; 20 21 #define __IRQ_WORK_INIT(_func, _flags) (struct irq_work){ \ 22 .node = { .u_flags = (_flags), }, \ 23 .func = (_func), \ 24 } 25 26 #define IRQ_WORK_INIT(_func) __IRQ_WORK_INIT(_func, 0) 27 #define IRQ_WORK_INIT_LAZY(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_LAZY) 28 #define IRQ_WORK_INIT_HARD(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_HARD_IRQ) 29 30 #define DEFINE_IRQ_WORK(name, _f) \ 31 struct irq_work name = IRQ_WORK_INIT(_f) 32 33 static inline 34 void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *)) 35 { 36 *work = IRQ_WORK_INIT(func); 37 } 38 39 static inline bool irq_work_is_pending(struct irq_work *work) 40 { 41 return atomic_read(&work->node.a_flags) & IRQ_WORK_PENDING; 42 } 43 44 static inline bool irq_work_is_busy(struct irq_work *work) 45 { 46 return atomic_read(&work->node.a_flags) & IRQ_WORK_BUSY; 47 } 48 49 bool irq_work_queue(struct irq_work *work); 50 bool irq_work_queue_on(struct irq_work *work, int cpu); 51 52 void irq_work_tick(void); 53 void irq_work_sync(struct irq_work *work); 54 55 #ifdef CONFIG_IRQ_WORK 56 #include <asm/irq_work.h> 57 58 void irq_work_run(void); 59 bool irq_work_needs_cpu(void); 60 void irq_work_single(void *arg); 61 #else 62 static inline bool irq_work_needs_cpu(void) { return false; } 63 static inline void irq_work_run(void) { } 64 static inline void irq_work_single(void *arg) { } 65 #endif 66 67 #endif /* _LINUX_IRQ_WORK_H */ 68