1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_IRQ_WORK_H
3 #define _LINUX_IRQ_WORK_H
5 #include <linux/llist.h>
8 * An entry can be in one of four states:
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
16 /* flags share CSD_FLAG_ space */
18 #define IRQ_WORK_PENDING BIT(0)
19 #define IRQ_WORK_BUSY BIT(1)
21 /* Doesn't want IPI, wait for tick: */
22 #define IRQ_WORK_LAZY BIT(2)
23 /* Run hard IRQ context, even on RT */
24 #define IRQ_WORK_HARD_IRQ BIT(3)
26 #define IRQ_WORK_CLAIMED (IRQ_WORK_PENDING | IRQ_WORK_BUSY)
29 * structure shares layout with single_call_data_t.
32 struct llist_node llnode;
34 void (*func)(struct irq_work *);
38 void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
40 atomic_set(&work->flags, 0);
44 #define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { \
45 .flags = ATOMIC_INIT(0), \
50 bool irq_work_queue(struct irq_work *work);
51 bool irq_work_queue_on(struct irq_work *work, int cpu);
53 void irq_work_tick(void);
54 void irq_work_sync(struct irq_work *work);
56 #ifdef CONFIG_IRQ_WORK
57 #include <asm/irq_work.h>
59 void irq_work_run(void);
60 bool irq_work_needs_cpu(void);
61 void irq_work_single(void *arg);
63 static inline bool irq_work_needs_cpu(void) { return false; }
64 static inline void irq_work_run(void) { }
65 static inline void irq_work_single(void *arg) { }
68 #endif /* _LINUX_IRQ_WORK_H */