xen/events: add a evtchn_op for port setup
Add a hook for port-specific setup and call it from
xen_irq_info_common_setup().
The FIFO-based ABIs may need to perform additional setup (expanding
the event array) before a bound event channel can start to receive
events.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
diff --git a/drivers/xen/events/events_internal.h b/drivers/xen/events/events_internal.h
index ba8142f..dc96502 100644
--- a/drivers/xen/events/events_internal.h
+++ b/drivers/xen/events/events_internal.h
@@ -55,6 +55,7 @@
#define PIRQ_SHAREABLE (1 << 1)
struct evtchn_ops {
+ int (*setup)(struct irq_info *info);
void (*bind_to_cpu)(struct irq_info *info, unsigned cpu);
void (*clear_pending)(unsigned port);
@@ -75,6 +76,17 @@
unsigned cpu_from_irq(unsigned irq);
unsigned cpu_from_evtchn(unsigned int evtchn);
+/*
+ * Do any ABI specific setup for a bound event channel before it can
+ * be unmasked and used.
+ */
+static inline int xen_evtchn_port_setup(struct irq_info *info)
+{
+ if (evtchn_ops->setup)
+ return evtchn_ops->setup(info);
+ return 0;
+}
+
static inline void xen_evtchn_port_bind_to_cpu(struct irq_info *info,
unsigned cpu)
{