1 files changed, 75 insertions, 0 deletions
diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h
new file mode 100644
index 000000000..8cd11a223
--- /dev/null
+++ b/include/linux/irq_work.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_IRQ_WORK_H
+#define _LINUX_IRQ_WORK_H
+
+#include <linux/smp_types.h>
+#include <linux/rcuwait.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 {
+	struct __call_single_node node;
+	void (*func)(struct irq_work *);
+	struct rcuwait irqwait;
+};
+
+#define __IRQ_WORK_INIT(_func, _flags) (struct irq_work){	\
+	.node = { .u_flags = (_flags), },			\
+	.func = (_func),					\
+	.irqwait = __RCUWAIT_INITIALIZER(irqwait),		\
+}
+
+#define IRQ_WORK_INIT(_func) __IRQ_WORK_INIT(_func, 0)
+#define IRQ_WORK_INIT_LAZY(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_LAZY)
+#define IRQ_WORK_INIT_HARD(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_HARD_IRQ)
+
+#define DEFINE_IRQ_WORK(name, _f)				\
+	struct irq_work name = IRQ_WORK_INIT(_f)
+
+static inline
+void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
+{
+	*work = IRQ_WORK_INIT(func);
+}
+
+static inline bool irq_work_is_pending(struct irq_work *work)
+{
+	return atomic_read(&work->node.a_flags) & IRQ_WORK_PENDING;
+}
+
+static inline bool irq_work_is_busy(struct irq_work *work)
+{
+	return atomic_read(&work->node.a_flags) & IRQ_WORK_BUSY;
+}
+
+static inline bool irq_work_is_hard(struct irq_work *work)
+{
+	return atomic_read(&work->node.a_flags) & IRQ_WORK_HARD_IRQ;
+}
+
+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 */