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
init_irq_work(struct irq_work * work,void (* func)(struct irq_work *))34 void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
35 {
36 *work = IRQ_WORK_INIT(func);
37 }
38
irq_work_is_pending(struct irq_work * work)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
irq_work_is_busy(struct irq_work * work)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
62 void arch_irq_work_raise(void);
63
64 #else
irq_work_needs_cpu(void)65 static inline bool irq_work_needs_cpu(void) { return false; }
irq_work_run(void)66 static inline void irq_work_run(void) { }
irq_work_single(void * arg)67 static inline void irq_work_single(void *arg) { }
68 #endif
69
70 #endif /* _LINUX_IRQ_WORK_H */
71