[Xen-devel] [PATCH 09/16] xen/events: add a evtchn_op for port setup

[David Vrabel <david.vrabel@xxxxxxxxxx>]

From: David Vrabel <david.vrabel@xxxxxxxxxx>

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@xxxxxxxxxx>
---
 drivers/xen/events/events_base.c     |    2 +-
 drivers/xen/events/events_internal.h |   12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 4f7d94a..929eccb 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -117,7 +117,7 @@ static int xen_irq_info_common_setup(struct irq_info *info,
 
        irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
 
-       return 0;
+       return xen_evtchn_port_setup(info);
 }
 
 static int xen_irq_info_evtchn_setup(unsigned irq,
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 @@ struct irq_info {
 #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 @@ struct irq_info *info_for_irq(unsigned irq);
 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)
 {
-- 
1.7.2.5


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