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[Xen-devel] [PATCH 14/24] xen: add irq_from_evtchn

To: "H. Peter Anvin" <hpa@xxxxxxxxx>
Subject: [Xen-devel] [PATCH 14/24] xen: add irq_from_evtchn
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Fri, 13 Mar 2009 01:11:50 -0700
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Ian Campbell <ian.campbell@xxxxxxxxxx>
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From: Ian Campbell <ian.campbell@xxxxxxxxxx>

Given an evtchn, return the corresponding irq.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
 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];
 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 */

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