| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _LINUX_IRQ_WORK_H |
| 3 | #define _LINUX_IRQ_WORK_H |
| 4 | |
| 5 | #include <linux/irq_work_types.h> |
| 6 | #include <linux/rcuwait.h> |
| 7 | #include <linux/smp_types.h> |
| 8 | |
| 9 | /* |
| 10 | * An entry can be in one of four states: |
| 11 | * |
| 12 | * free NULL, 0 -> {claimed} : free to be used |
| 13 | * claimed NULL, 3 -> {pending} : claimed to be enqueued |
| 14 | * pending next, 3 -> {busy} : queued, pending callback |
| 15 | * busy NULL, 2 -> {free, claimed} : callback in progress, can be claimed |
| 16 | */ |
| 17 | |
| 18 | #define __IRQ_WORK_INIT(_func, _flags) (struct irq_work){ \ |
| 19 | .node = { .u_flags = (_flags), }, \ |
| 20 | .func = (_func), \ |
| 21 | .irqwait = __RCUWAIT_INITIALIZER(irqwait), \ |
| 22 | } |
| 23 | |
| 24 | #define IRQ_WORK_INIT(_func) __IRQ_WORK_INIT(_func, 0) |
| 25 | #define IRQ_WORK_INIT_LAZY(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_LAZY) |
| 26 | #define IRQ_WORK_INIT_HARD(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_HARD_IRQ) |
| 27 | |
| 28 | #define DEFINE_IRQ_WORK(name, _f) \ |
| 29 | struct irq_work name = IRQ_WORK_INIT(_f) |
| 30 | |
| 31 | static inline |
| 32 | void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *)) |
| 33 | { |
| 34 | *work = IRQ_WORK_INIT(func); |
| 35 | } |
| 36 | |
| 37 | static inline bool irq_work_is_pending(struct irq_work *work) |
| 38 | { |
| 39 | return atomic_read(v: &work->node.a_flags) & IRQ_WORK_PENDING; |
| 40 | } |
| 41 | |
| 42 | static inline bool irq_work_is_busy(struct irq_work *work) |
| 43 | { |
| 44 | return atomic_read(v: &work->node.a_flags) & IRQ_WORK_BUSY; |
| 45 | } |
| 46 | |
| 47 | static inline bool irq_work_is_hard(struct irq_work *work) |
| 48 | { |
| 49 | return atomic_read(v: &work->node.a_flags) & IRQ_WORK_HARD_IRQ; |
| 50 | } |
| 51 | |
| 52 | bool irq_work_queue(struct irq_work *work); |
| 53 | bool irq_work_queue_on(struct irq_work *work, int cpu); |
| 54 | |
| 55 | void irq_work_tick(void); |
| 56 | void irq_work_sync(struct irq_work *work); |
| 57 | |
| 58 | #ifdef CONFIG_IRQ_WORK |
| 59 | #include <asm/irq_work.h> |
| 60 | |
| 61 | void irq_work_run(void); |
| 62 | bool irq_work_needs_cpu(void); |
| 63 | void irq_work_single(void *arg); |
| 64 | |
| 65 | void arch_irq_work_raise(void); |
| 66 | |
| 67 | #else |
| 68 | static inline bool irq_work_needs_cpu(void) { return false; } |
| 69 | static inline void irq_work_run(void) { } |
| 70 | static inline void irq_work_single(void *arg) { } |
| 71 | #endif |
| 72 | |
| 73 | #endif /* _LINUX_IRQ_WORK_H */ |
| 74 | |