[PATCH 14/24] xen: add irq_from_evtchn

Jeremy Fitzhardinge
2009-03-13T08:21:03Z

From: Ian Campbell <ian.campbell@citrix.com>

Given an evtchn, return the corresponding irq.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
drivers/xen/events.c | 6 ++++++
include/xen/events.h | 3 +++
2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 30963af..1cd2a0e 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -151,6 +151,12 @@ static unsigned int evtchn_from_irq(unsigned irq)
return info_for_irq(irq)->evtchn;
}

+unsigned irq_from_evtchn(unsigned int evtchn)
+{
+ return evtchn_to_irq[evtchn];
+}
+EXPORT_SYMBOL_GPL(irq_from_evtchn);
+
static enum ipi_vector ipi_from_irq(unsigned irq)
{
struct irq_info *info = info_for_irq(irq);
diff --git a/include/xen/events.h b/include/xen/events.h
index 0d5f1ad..e68d59a 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -53,4 +53,7 @@ bool xen_test_irq_pending(int irq);
irq will be disabled so it won't deliver an interrupt. */
void xen_poll_irq(int irq);

+/* Determine the IRQ which is bound to an event channel */
+unsigned irq_from_evtchn(unsigned int evtchn);
+
#endif /* _XEN_EVENTS_H */
--
1.6.0.6