diff options
Diffstat (limited to 'include/linux/irq_work.h')
| -rw-r--r-- | include/linux/irq_work.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h new file mode 100644 index 000000000..30823780c --- /dev/null +++ b/include/linux/irq_work.h @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_IRQ_WORK_H +#define _LINUX_IRQ_WORK_H + +#include <linux/smp_types.h> + +/* + * An entry can be in one of four states: + * + * free NULL, 0 -> {claimed} : free to be used + * claimed NULL, 3 -> {pending} : claimed to be enqueued + * pending next, 3 -> {busy} : queued, pending callback + * busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed + */ + +struct irq_work { + union { + struct __call_single_node node; + struct { + struct llist_node llnode; + atomic_t flags; + }; + }; + void (*func)(struct irq_work *); +}; + +static inline +void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *)) +{ + atomic_set(&work->flags, 0); + work->func = func; +} + +#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { \ + .flags = ATOMIC_INIT(0), \ + .func = (_f) \ +} + + +bool irq_work_queue(struct irq_work *work); +bool irq_work_queue_on(struct irq_work *work, int cpu); + +void irq_work_tick(void); +void irq_work_sync(struct irq_work *work); + +#ifdef CONFIG_IRQ_WORK +#include <asm/irq_work.h> + +void irq_work_run(void); +bool irq_work_needs_cpu(void); +void irq_work_single(void *arg); +#else +static inline bool irq_work_needs_cpu(void) { return false; } +static inline void irq_work_run(void) { } +static inline void irq_work_single(void *arg) { } +#endif + +#endif /* _LINUX_IRQ_WORK_H */ |