[Xen-devel] [PATCH] add event channel information to domain dump

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

Given the existance of lsevtchn, perhaps this should be done only for
Dom0, where the information may be necessary but unavailable (i.e.
because the domain is hanging).

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

Index: 2008-09-19/xen/common/event_channel.c
===================================================================
--- 2008-09-19.orig/xen/common/event_channel.c  2008-09-08 12:57:38.000000000 
+0200
+++ 2008-09-19/xen/common/event_channel.c       2008-09-19 13:59:54.000000000 
+0200
@@ -1079,6 +1079,56 @@ void evtchn_destroy(struct domain *d)
     spin_unlock(&d->evtchn_lock);
 }
 
+void dump_evtchn_info(struct domain *d)
+{
+    unsigned int port;
+
+    printk("Domain %d polling vCPUs: %08lx\n", d->domain_id, d->poll_mask[0]);
+
+    if ( !spin_trylock(&d->evtchn_lock) )
+        return;
+
+    printk("Event channel information for domain %d:\n",
+           d->domain_id);
+
+    for ( port = 1; port < MAX_EVTCHNS(d); ++port )
+    {
+        const struct evtchn *chn;
+
+        if ( !port_is_valid(d, port) )
+            continue;
+        chn = evtchn_from_port(d, port);
+        if ( chn->state == ECS_FREE )
+            continue;
+
+        printk("    %4u[%d/%d]: s=%d n=%d",
+               port,
+               test_bit(port, &shared_info(d, evtchn_pending)),
+               test_bit(port, &shared_info(d, evtchn_mask)),
+               chn->state, chn->notify_vcpu_id);
+        switch ( chn->state )
+        {
+        case ECS_UNBOUND:
+            printk(" d=%d", chn->u.unbound.remote_domid);
+            break;
+        case ECS_INTERDOMAIN:
+            printk(" d=%d p=%d",
+                   chn->u.interdomain.remote_dom->domain_id,
+                   chn->u.interdomain.remote_port);
+            break;
+        case ECS_PIRQ:
+            printk(" p=%d", chn->u.pirq);
+            break;
+        case ECS_VIRQ:
+            printk(" v=%d", chn->u.virq);
+            break;
+        }
+        printk(" x=%d\n", chn->consumer_is_xen);
+    }
+
+    spin_unlock(&d->evtchn_lock);
+}
+
 /*
  * Local variables:
  * mode: C
Index: 2008-09-19/xen/common/keyhandler.c
===================================================================
--- 2008-09-19.orig/xen/common/keyhandler.c     2008-09-19 13:59:19.000000000 
+0200
+++ 2008-09-19/xen/common/keyhandler.c  2008-09-19 13:59:54.000000000 +0200
@@ -205,11 +205,11 @@ static void dump_domains(unsigned char k
         printk("VCPU information and callbacks for domain %u:\n",
                d->domain_id);
         for_each_vcpu ( d, v ) {
-            printk("    VCPU%d: CPU%d [has=%c] flags=%lx "
+            printk("    VCPU%d: CPU%d [has=%c] flags=%lx poll=%d "
                    "upcall_pend = %02x, upcall_mask = %02x ",
                    v->vcpu_id, v->processor,
                    v->is_running ? 'T':'F',
-                   v->pause_flags,
+                   v->pause_flags, v->poll_evtchn,
                    vcpu_info(v, evtchn_upcall_pending),
                    vcpu_info(v, evtchn_upcall_mask));
             cpuset_print(tmpstr, sizeof(tmpstr), v->vcpu_dirty_cpumask);
@@ -230,6 +230,8 @@ static void dump_domains(unsigned char k
                             &vcpu_info(v, evtchn_pending_sel)));
             send_guest_vcpu_virq(v, VIRQ_DEBUG);
         }
+
+        dump_evtchn_info(d);
     }
 
     rcu_read_unlock(&domlist_read_lock);
Index: 2008-09-19/xen/include/xen/event.h
===================================================================
--- 2008-09-19.orig/xen/include/xen/event.h     2008-09-16 15:56:35.000000000 
+0200
+++ 2008-09-19/xen/include/xen/event.h  2008-09-19 13:59:54.000000000 +0200
@@ -79,4 +79,6 @@ void notify_via_xen_event_channel(int lp
         mb(); /* set blocked status /then/ caller does his work */      \
     } while ( 0 )
 
+void dump_evtchn_info(struct domain *);
+
 #endif /* __XEN_EVENT_H__ */




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