[PATCH 03/11] evtchn: print ABI specific state with the 'e' debug key

[David Vrabel <david.vrabel@citrix.com>]

From: David Vrabel <david.vrabel@citrix.com>

In the output of the 'e' debug key, print some ABI specific state in
addition to the (p)ending and (m)asked bits.

For the 2-level ABI, print the state of that event's selector
bit. e.g.,

(XEN)     port [p/m/s]
(XEN)        1 [0/0/1]: s=3 n=0 x=0 d=0 p=74
(XEN)        2 [0/0/1]: s=3 n=0 x=0 d=0 p=75

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
 xen/common/event_2l.c      |   10 ++++++++++
 xen/common/event_channel.c |    8 +++++---
 xen/include/xen/event.h    |    7 +++++++
 3 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/xen/common/event_2l.c b/xen/common/event_2l.c
index ed6de38..5c27eab 100644
--- a/xen/common/event_2l.c
+++ b/xen/common/event_2l.c
@@ -74,6 +74,15 @@ static bool_t evtchn_2l_is_masked(struct domain *d,
     return test_bit(evtchn->port, &shared_info(d, evtchn_mask));
 }
 
+static void evtchn_2l_print_state(struct domain *d,
+                                  const struct evtchn *evtchn)
+{
+    struct vcpu *v = d->vcpu[evtchn->notify_vcpu_id];
+
+    printk("%d", !!test_bit(evtchn->port / BITS_PER_EVTCHN_WORD(d),
+                            &vcpu_info(v, evtchn_pending_sel)));
+}
+
 static const struct evtchn_port_ops evtchn_port_ops_2l =
 {
     .set_pending   = evtchn_2l_set_pending,
@@ -81,6 +90,7 @@ static const struct evtchn_port_ops evtchn_port_ops_2l =
     .unmask        = evtchn_2l_unmask,
     .is_pending    = evtchn_2l_is_pending,
     .is_masked     = evtchn_2l_is_masked,
+    .print_state   = evtchn_2l_print_state,
 };
 
 void evtchn_2l_init(struct domain *d)
diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index 7290a21..f73c7a9 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -1232,7 +1232,7 @@ static void domain_dump_evtchn_info(struct domain *d)
                          d->poll_mask, d->max_vcpus);
     printk("Event channel information for domain %d:\n"
            "Polling vCPUs: {%s}\n"
-           "    port [p/m]\n", d->domain_id, keyhandler_scratch);
+           "    port [p/m/s]\n", d->domain_id, keyhandler_scratch);
 
     spin_lock(&d->event_lock);
 
@@ -1247,10 +1247,12 @@ static void domain_dump_evtchn_info(struct domain *d)
         if ( chn->state == ECS_FREE )
             continue;
 
-        printk("    %4u [%d/%d]: s=%d n=%d x=%d",
+        printk("    %4u [%d/%d/",
                port,
                !!evtchn_port_is_pending(d, chn),
-               !!evtchn_port_is_masked(d, chn),
+               !!evtchn_port_is_masked(d, chn));
+        evtchn_port_print_state(d, chn);
+        printk("]: s=%d n=%d x=%d",
                chn->state, chn->notify_vcpu_id, chn->xen_consumer);
 
         switch ( chn->state )
diff --git a/xen/include/xen/event.h b/xen/include/xen/event.h
index 30c59c9..2445562 100644
--- a/xen/include/xen/event.h
+++ b/xen/include/xen/event.h
@@ -115,6 +115,7 @@ struct evtchn_port_ops {
     void (*unmask)(struct domain *d, struct evtchn *evtchn);
     bool_t (*is_pending)(struct domain *d, const struct evtchn *evtchn);
     bool_t (*is_masked)(struct domain *d, const struct evtchn *evtchn);
+    void (*print_state)(struct domain *d, const struct evtchn *evtchn);
 };
 
 static inline void evtchn_port_set_pending(struct vcpu *v,
@@ -147,4 +148,10 @@ static inline bool_t evtchn_port_is_masked(struct domain *d,
     return d->evtchn_port_ops->is_masked(d, evtchn);
 }
 
+static inline void evtchn_port_print_state(struct domain *d,
+                                           const struct evtchn *evtchn)
+{
+    d->evtchn_port_ops->print_state(d, evtchn);
+}
+
 #endif /* __XEN_EVENT_H__ */
-- 
1.7.2.5