[Xen-devel] [PATCH 11/13] xen: introduce xen_event_channel_register_nlevel

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 drivers/xen/events.c |   46 ++++++++++++++++++++++++++++++++++++++++------
 include/xen/events.h |    6 ++++++
 2 files changed, 46 insertions(+), 6 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 9038211..f77909d 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -2217,17 +2217,51 @@ err:
        return rc;
 }
 
+int xen_event_channel_register_nlevel(unsigned int level)
+{
+       int rc;
+
+       switch (level) {
+       case 3:
+               rc = xen_event_channel_register_3level();
+               break;
+       default:
+               printk(KERN_INFO "Trying to register unsupported %d-level event 
channel\n",
+                      level);
+               rc = -EINVAL;
+       }
+
+       return rc;
+}
+
+void xen_set_event_channel_nlevel(unsigned int level)
+{
+       struct shared_info *s = HYPERVISOR_shared_info;
+       switch (level) {
+       case 2:
+               evtchn_pending = s->evtchn_pending;
+               evtchn_mask = s->evtchn_mask;
+               evtchn_level = 2;
+               nr_event_channels = NR_EVENT_CHANNELS_L2;
+               break;
+       case 3:
+               /* evtchn_pending/mask already set */
+               evtchn_level = 3;
+               nr_event_channels = NR_EVENT_CHANNELS_L3;
+               break;
+       default:
+               printk(KERN_EMERG "Trying to set unsupported %d-level event 
channel\n",
+                      level);
+               BUG();
+       }
+}
+
 void __init xen_init_IRQ(void)
 {
        int i, rc;
        int cpu;
-       struct shared_info *s = HYPERVISOR_shared_info;
-
-       evtchn_pending = s->evtchn_pending;
-       evtchn_mask = s->evtchn_mask;
 
-       evtchn_level = 2;
-       nr_event_channels = NR_EVENT_CHANNELS_L2;
+       xen_set_event_channel_nlevel(2);
 
        evtchn_to_irq = kcalloc(nr_event_channels, sizeof(*evtchn_to_irq),
                                    GFP_KERNEL);
diff --git a/include/xen/events.h b/include/xen/events.h
index 6b117ac..cbc1b71 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -111,4 +111,10 @@ int xen_test_irq_shared(int irq);
 
 extern unsigned int nr_event_channels;
 
+/* Register N-level event channel */
+int xen_event_channel_register_nlevel(unsigned int level);
+
+/* Set event channel to N-level if registration succeed */
+void xen_set_event_channel_nlevel(unsigned int level);
+
 #endif /* _XEN_EVENTS_H */
-- 
1.7.10.4


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