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(v: &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(v: &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(v: &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 | |