xen: add resend_irq_on_evtchn() definition into events.c

Define resend_irq_on_evtchn() which ia64/xen uses.
Although it isn't used by current x86/xen code, it's arch generic
so that put it into common code.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 2396b4492f702b65d438488977825cebef99973e..4f0f22b020ea4aa192dbab56cba76edd6076a837 100644 (file)
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -586,6 +586,22 @@ static void set_affinity_irq(unsigned irq, cpumask_t dest)
        rebind_irq_to_cpu(irq, tcpu);
 }
 
+int resend_irq_on_evtchn(unsigned int irq)
+{
+       int masked, evtchn = evtchn_from_irq(irq);
+       struct shared_info *s = HYPERVISOR_shared_info;
+
+       if (!VALID_EVTCHN(evtchn))
+               return 1;
+
+       masked = sync_test_and_set_bit(evtchn, s->evtchn_mask);
+       sync_set_bit(evtchn, s->evtchn_pending);
+       if (!masked)
+               unmask_evtchn(evtchn);
+
+       return 1;
+}
+
 static void enable_dynirq(unsigned int irq)
 {
        int evtchn = evtchn_from_irq(irq);

diff --git a/include/xen/events.h b/include/xen/events.h
index d99a3e0df8808468bd65812e0c5e1b27ad189e90..acd8e062c85f381b5520c2ac27f13681053bedd0 100644 (file)
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -31,6 +31,7 @@ int bind_ipi_to_irqhandler(enum ipi_vector ipi,
 void unbind_from_irqhandler(unsigned int irq, void *dev_id);
 
 void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
+int resend_irq_on_evtchn(unsigned int irq);
 
 static inline void notify_remote_via_evtchn(int port)
 {