diff options
Diffstat (limited to 'kernel/include/linux/irq_work.h')
| -rw-r--r-- | kernel/include/linux/irq_work.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/kernel/include/linux/irq_work.h b/kernel/include/linux/irq_work.h new file mode 100644 index 000000000..0e427a999 --- /dev/null +++ b/kernel/include/linux/irq_work.h @@ -0,0 +1,55 @@ +#ifndef _LINUX_IRQ_WORK_H +#define _LINUX_IRQ_WORK_H + +#include <linux/llist.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 + */ + +#define IRQ_WORK_PENDING 1UL +#define IRQ_WORK_BUSY 2UL +#define IRQ_WORK_FLAGS 3UL +#define IRQ_WORK_LAZY 4UL /* Doesn't want IPI, wait for tick */ +#define IRQ_WORK_HARD_IRQ 8UL /* Run hard IRQ context, even on RT */ + +struct irq_work { + unsigned long flags; + struct llist_node llnode; + void (*func)(struct irq_work *); +}; + +static inline +void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *)) +{ + work->flags = 0; + work->func = func; +} + +#define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { .func = (_f), } + +bool irq_work_queue(struct irq_work *work); + +#ifdef CONFIG_SMP +bool irq_work_queue_on(struct irq_work *work, int cpu); +#endif + +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); +#else +static inline bool irq_work_needs_cpu(void) { return false; } +static inline void irq_work_run(void) { } +#endif + +#endif /* _LINUX_IRQ_WORK_H */ |