xen/irq: implement bind_interdomain_evtchn_to_irqhandler for backend drivers

Impact: new Xen-internal API

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 74681478100ae2c20442df9b4d9d7eb8df9f12c1..a41601675633539d2ef4709046919dd3bf020b32 100644 (file)
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -864,6 +864,21 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
        return irq;
 }
 
+static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
+                                         unsigned int remote_port)
+{
+       struct evtchn_bind_interdomain bind_interdomain;
+       int err;
+
+       bind_interdomain.remote_dom  = remote_domain;
+       bind_interdomain.remote_port = remote_port;
+
+       err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
+                                         &bind_interdomain);
+
+       return err ? : bind_evtchn_to_irq(bind_interdomain.local_port);
+}
+
 
 int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
 {
@@ -959,6 +974,29 @@ int bind_evtchn_to_irqhandler(unsigned int evtchn,
 }
 EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler);
 
+int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
+                                         unsigned int remote_port,
+                                         irq_handler_t handler,
+                                         unsigned long irqflags,
+                                         const char *devname,
+                                         void *dev_id)
+{
+       int irq, retval;
+
+       irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port);
+       if (irq < 0)
+               return irq;
+
+       retval = request_irq(irq, handler, irqflags, devname, dev_id);
+       if (retval != 0) {
+               unbind_from_irq(irq);
+               return retval;
+       }
+
+       return irq;
+}
+EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler);
+
 int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
                            irq_handler_t handler,
                            unsigned long irqflags, const char *devname, void *dev_id)

diff --git a/include/xen/events.h b/include/xen/events.h
index 00f53ddcc06284658d33ff80d66908e2b394d4ca..bd03b1e4a2f40167a5d212e9b5c5d8612310583b 100644 (file)
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -23,6 +23,12 @@ int bind_ipi_to_irqhandler(enum ipi_vector ipi,
                           unsigned long irqflags,
                           const char *devname,
                           void *dev_id);
+int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
+                                         unsigned int remote_port,
+                                         irq_handler_t handler,
+                                         unsigned long irqflags,
+                                         const char *devname,
+                                         void *dev_id);
 
 /*
  * Common unbind function for all event sources. Takes IRQ to unbind from.