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authorChristoph Hellwig <hch@lst.de>2015-11-10 14:56:14 +0100
committerChristoph Hellwig <hch@lst.de>2015-12-11 11:52:24 -0800
commit511cbce2ff8b9d322077909ee90c5d4b67b29b75 (patch)
tree27e1f9e09332d204ec1a1a506e674ca80ed9e580 /include/linux/irq_poll.h
parenta2dbb7b56f2c29fc78b18a3fbe47ad80f6912092 (diff)
irq_poll: make blk-iopoll available outside the block layer
The new name is irq_poll as iopoll is already taken. Better suggestions welcome. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Diffstat (limited to 'include/linux/irq_poll.h')
-rw-r--r--include/linux/irq_poll.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/include/linux/irq_poll.h b/include/linux/irq_poll.h
new file mode 100644
index 000000000000..50c39dcd2cba
--- /dev/null
+++ b/include/linux/irq_poll.h
@@ -0,0 +1,46 @@
+#ifndef IRQ_POLL_H
+#define IRQ_POLL_H
+
+struct irq_poll;
+typedef int (irq_poll_fn)(struct irq_poll *, int);
+
+struct irq_poll {
+ struct list_head list;
+ unsigned long state;
+ unsigned long data;
+ int weight;
+ int max;
+ irq_poll_fn *poll;
+};
+
+enum {
+ IRQ_POLL_F_SCHED = 0,
+ IRQ_POLL_F_DISABLE = 1,
+};
+
+/*
+ * Returns 0 if we successfully set the IRQ_POLL_F_SCHED bit, indicating
+ * that we were the first to acquire this iop for scheduling. If this iop
+ * is currently disabled, return "failure".
+ */
+static inline int irq_poll_sched_prep(struct irq_poll *iop)
+{
+ if (!test_bit(IRQ_POLL_F_DISABLE, &iop->state))
+ return test_and_set_bit(IRQ_POLL_F_SCHED, &iop->state);
+
+ return 1;
+}
+
+static inline int irq_poll_disable_pending(struct irq_poll *iop)
+{
+ return test_bit(IRQ_POLL_F_DISABLE, &iop->state);
+}
+
+extern void irq_poll_sched(struct irq_poll *);
+extern void irq_poll_init(struct irq_poll *, int, irq_poll_fn *);
+extern void irq_poll_complete(struct irq_poll *);
+extern void __irq_poll_complete(struct irq_poll *);
+extern void irq_poll_enable(struct irq_poll *);
+extern void irq_poll_disable(struct irq_poll *);
+
+#endif