| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _LINUX_IRQ_WORK_H |
| 3 | #define _LINUX_IRQ_WORK_H |
| 4 | |
| 5 | #include <linux/llist.h> |
| 6 | |
| 7 | /* |
| 8 | * An entry can be in one of four states: |
| 9 | * |
| 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 |
| 14 | */ |
| 15 | |
| 16 | #define IRQ_WORK_PENDING BIT(0) |
| 17 | #define IRQ_WORK_BUSY BIT(1) |
| 18 | |
| 19 | /* Doesn't want IPI, wait for tick: */ |
| 20 | #define IRQ_WORK_LAZY BIT(2) |
| 21 | |
| 22 | #define IRQ_WORK_CLAIMED (IRQ_WORK_PENDING | IRQ_WORK_BUSY) |
| 23 | |
| 24 | struct irq_work { |
| 25 | unsigned long flags; |
| 26 | struct llist_node llnode; |
| 27 | void (*func)(struct irq_work *); |
| 28 | }; |
| 29 | |
| 30 | static inline |
| 31 | void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *)) |
| 32 | { |
| 33 | work->flags = 0; |
| 34 | work->func = func; |
| 35 | } |
| 36 | |
| 37 | #define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { .func = (_f), } |
| 38 | |
| 39 | bool irq_work_queue(struct irq_work *work); |
| 40 | bool irq_work_queue_on(struct irq_work *work, int cpu); |
| 41 | |
| 42 | void irq_work_tick(void); |
| 43 | void irq_work_sync(struct irq_work *work); |
| 44 | |
| 45 | #ifdef CONFIG_IRQ_WORK |
| 46 | #include <asm/irq_work.h> |
| 47 | |
| 48 | void irq_work_run(void); |
| 49 | bool irq_work_needs_cpu(void); |
| 50 | #else |
| 51 | static inline bool irq_work_needs_cpu(void) { return false; } |
| 52 | static inline void irq_work_run(void) { } |
| 53 | #endif |
| 54 | |
| 55 | #endif /* _LINUX_IRQ_WORK_H */ |