xen/irq: Export 'xen_pirq_from_irq' function.

We need this to find the real Xen PIRQ value for a device
that requests an MSI or MSI-X. In the past we used
'xen_gsi_from_irq' since that function would return
an Xen PIRQ or GSI depending on the provided IRQ. Now that
we have seperated that we need to use the correct
function.

[v2: Deal with rebase on stable/irq.cleanup]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 0ac7a149e7f2..e4e8e9a745bf 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -763,6 +763,12 @@ out:
         return irq;
 }
 
+
+int xen_pirq_from_irq(unsigned irq)
+{
+        return pirq_from_irq(irq);
+}
+EXPORT_SYMBOL_GPL(xen_pirq_from_irq);
 int bind_evtchn_to_irq(unsigned int evtchn)
 {
         int irq;