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
70 void arch_irq_work_raise(void);
71
72 #else
73 static inline bool irq_work_needs_cpu(void) { return false; }
74 static inline void irq_work_run(void) { }
75 static inline void irq_work_single(void *arg) { }
76 #endif
77
78 #endif /* _LINUX_IRQ_WORK_H */
79
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