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 #include <linux/rcuwait.h> 7 8 /* 9 * An entry can be in one of four states: 10 * 11 * free NULL, 0 -> {claimed} : free to be used 12 * claimed NULL, 3 -> {pending} : claimed to be enqueued 13 * pending next, 3 -> {busy} : queued, pending callback 14 * busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed 15 */ 16 17 struct irq_work { 18 struct __call_single_node node; 19 void (*func)(struct irq_work *); 20 struct rcuwait irqwait; 21 }; 22 23 #define __IRQ_WORK_INIT(_func, _flags) (struct irq_work){ \ 24 .node = { .u_flags = (_flags), }, \ 25 .func = (_func), \ 26 .irqwait = __RCUWAIT_INITIALIZER(irqwait), \ 27 } 28 29 #define IRQ_WORK_INIT(_func) __IRQ_WORK_INIT(_func, 0) 30 #define IRQ_WORK_INIT_LAZY(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_LAZY) 31 #define IRQ_WORK_INIT_HARD(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_HARD_IRQ) 32 33 #define DEFINE_IRQ_WORK(name, _f) \ 34 struct irq_work name = IRQ_WORK_INIT(_f) 35 36 static inline 37 void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *)) 38 { 39 *work = IRQ_WORK_INIT(func); 40 } 41 42 static inline bool irq_work_is_pending(struct irq_work *work) 43 { 44 return atomic_read(&work->node.a_flags) & IRQ_WORK_PENDING; 45 } 46 47 static inline bool irq_work_is_busy(struct irq_work *work) 48 { 49 return atomic_read(&work->node.a_flags) & IRQ_WORK_BUSY; 50 } 51 52 static inline bool irq_work_is_hard(struct irq_work *work) 53 { 54 return atomic_read(&work->node.a_flags) & IRQ_WORK_HARD_IRQ; 55 } 56 57 bool irq_work_queue(struct irq_work *work); 58 bool irq_work_queue_on(struct irq_work *work, int cpu); 59 60 void irq_work_tick(void); 61 void irq_work_sync(struct irq_work *work); 62 63 #ifdef CONFIG_IRQ_WORK 64 #include <asm/irq_work.h> 65 66 void irq_work_run(void); 67 bool irq_work_needs_cpu(void); 68 void irq_work_single(void *arg); 69 #else 70 static inline bool irq_work_needs_cpu(void) { return false; } 71 static inline void irq_work_run(void) { } 72 static inline void irq_work_single(void *arg) { } 73 #endif 74 75 #endif /* _LINUX_IRQ_WORK_H */ 76