replace d->nr_pirqs sized arrays with radix tree

With this it is questionable whether retaining struct domain's
nr_pirqs is actually necessary - the value now only serves for bounds
checking, and this boundary could easily be nr_irqs.

Another thing to consider is whether it's worth storing the pirq
number in struct pirq, to avoid passing the number and a pointer to
quite a number of functions.

Note that ia64, the build of which is broken currently anyway, is only
partially fixed up.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

1 files changed, 25 insertions, 17 deletions

diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index 558fbb1256..56d80b9bed 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -325,6 +325,7 @@ static long evtchn_bind_pirq(evtchn_bind_pirq_t *bind)
     struct evtchn *chn;
     struct domain *d = current->domain;
     struct vcpu   *v = d->vcpu[0];
+    struct pirq   *info;
     int            port, pirq = bind->pirq;
     long           rc;
 
@@ -336,7 +337,7 @@ static long evtchn_bind_pirq(evtchn_bind_pirq_t *bind)
 
     spin_lock(&d->event_lock);
 
-    if ( d->pirq_to_evtchn[pirq] != 0 )
+    if ( pirq_to_evtchn(d, pirq) != 0 )
         ERROR_EXIT(-EEXIST);
 
     if ( (port = get_free_port(d)) < 0 )
@@ -344,14 +345,18 @@ static long evtchn_bind_pirq(evtchn_bind_pirq_t *bind)
 
     chn = evtchn_from_port(d, port);
 
-    d->pirq_to_evtchn[pirq] = port;
+    info = pirq_get_info(d, pirq);
+    if ( !info )
+        ERROR_EXIT(-ENOMEM);
+    info->evtchn = port;
     rc = (!is_hvm_domain(d)
-          ? pirq_guest_bind(
-              v, pirq, !!(bind->flags & BIND_PIRQ__WILL_SHARE))
+          ? pirq_guest_bind(v, pirq, info,
+                            !!(bind->flags & BIND_PIRQ__WILL_SHARE))
           : 0);
     if ( rc != 0 )
     {
-        d->pirq_to_evtchn[pirq] = 0;
+        info->evtchn = 0;
+        pirq_cleanup_check(info, d, pirq);
         goto out;
     }
 
@@ -404,12 +409,18 @@ static long __evtchn_close(struct domain *d1, int port1)
     case ECS_UNBOUND:
         break;
 
-    case ECS_PIRQ:
+    case ECS_PIRQ: {
+        struct pirq *pirq = pirq_info(d1, chn1->u.pirq.irq);
+
+        if ( !pirq )
+            break;
         if ( !is_hvm_domain(d1) )
-            pirq_guest_unbind(d1, chn1->u.pirq.irq);
-        d1->pirq_to_evtchn[chn1->u.pirq.irq] = 0;
+            pirq_guest_unbind(d1, chn1->u.pirq.irq, pirq);
+        pirq->evtchn = 0;
+        pirq_cleanup_check(pirq, d1, chn1->u.pirq.irq);
         unlink_pirq_port(chn1, d1->vcpu[chn1->notify_vcpu_id]);
         break;
+    }
 
     case ECS_VIRQ:
         for_each_vcpu ( d1, v )
@@ -659,9 +670,9 @@ void send_guest_global_virq(struct domain *d, int virq)
     spin_unlock_irqrestore(&v->virq_lock, flags);
 }
 
-int send_guest_pirq(struct domain *d, int pirq)
+int send_guest_pirq(struct domain *d, const struct pirq *pirq)
 {
-    int port = d->pirq_to_evtchn[pirq];
+    int port;
     struct evtchn *chn;
 
     /*
@@ -670,7 +681,7 @@ int send_guest_pirq(struct domain *d, int pirq)
      * HVM guests: Port is legitimately zero when the guest disables the
      *     emulated interrupt/evtchn.
      */
-    if ( port == 0 )
+    if ( pirq == NULL || (port = pirq->evtchn) == 0 )
     {
         BUG_ON(!is_hvm_domain(d));
         return 0;
@@ -812,13 +823,10 @@ int evtchn_unmask(unsigned int port)
     struct domain *d = current->domain;
     struct vcpu   *v;
 
-    spin_lock(&d->event_lock);
+    ASSERT(spin_is_locked(&d->event_lock));
 
     if ( unlikely(!port_is_valid(d, port)) )
-    {
-        spin_unlock(&d->event_lock);
         return -EINVAL;
-    }
 
     v = d->vcpu[evtchn_from_port(d, port)->notify_vcpu_id];
 
@@ -834,8 +842,6 @@ int evtchn_unmask(unsigned int port)
         vcpu_mark_events_pending(v);
     }
 
-    spin_unlock(&d->event_lock);
-
     return 0;
 }
 
@@ -960,7 +966,9 @@ long do_event_channel_op(int cmd, XEN_GUEST_HANDLE(void) arg)
         struct evtchn_unmask unmask;
         if ( copy_from_guest(&unmask, arg, 1) != 0 )
             return -EFAULT;
+        spin_lock(&current->domain->event_lock);
         rc = evtchn_unmask(unmask.port);
+        spin_unlock(&current->domain->event_lock);
         break;
     }