ioapic: support "info irq"

This include both userspace and in-kernel ioapic.  Note that the numbers
can be inaccurate for kvm-ioapic.  One reason is the same with
kvm-i8259, that when irqfd is used, irqs can be delivered all inside
kernel without our notice.  Meanwhile, kvm-ioapic is specially treated
when irq numbers <ISA_NUM_IRQS, those irqs will be delivered in kernel
too via kvm-i8259 (please refer to kvm_pc_gsi_handler).

Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20171229073104.3810-5-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

4 files changed, 29 insertions, 0 deletions

diff --git a/hw/i386/kvm/ioapic.c b/hw/i386/kvm/ioapic.c
index 646f6245ee..5274dc709b 100644
--- a/hw/i386/kvm/ioapic.c
+++ b/hw/i386/kvm/ioapic.c
@@ -132,8 +132,10 @@ static void kvm_ioapic_reset(DeviceState *dev)
 static void kvm_ioapic_set_irq(void *opaque, int irq, int level)
 {
     KVMIOAPICState *s = opaque;
+    IOAPICCommonState *common = IOAPIC_COMMON(s);
     int delivered;
 
+    ioapic_stat_update_irq(common, irq, level);
     delivered = kvm_set_irq(kvm_state, s->kvm_gsi_base + irq, level);
     apic_report_irq_delivered(delivered);
 }
diff --git a/hw/intc/ioapic.c b/hw/intc/ioapic.c
index c45f073271..222f3f7d47 100644
--- a/hw/intc/ioapic.c
+++ b/hw/intc/ioapic.c
@@ -148,6 +148,7 @@ static void ioapic_set_irq(void *opaque, int vector, int level)
      * the cleanest way of doing it but it should work. */
 
     trace_ioapic_set_irq(vector, level);
+    ioapic_stat_update_irq(s, vector, level);
     if (vector == 0) {
         vector = 2;
     }
diff --git a/hw/intc/ioapic_common.c b/hw/intc/ioapic_common.c
index a02c135b24..692dc37bb6 100644
--- a/hw/intc/ioapic_common.c
+++ b/hw/intc/ioapic_common.c
@@ -35,6 +35,28 @@
  */
 int ioapic_no;
 
+void ioapic_stat_update_irq(IOAPICCommonState *s, int irq, int level)
+{
+    if (level != s->irq_level[irq]) {
+        s->irq_level[irq] = level;
+        if (level == 1) {
+            s->irq_count[irq]++;
+        }
+    }
+}
+
+static bool ioapic_get_statistics(InterruptStatsProvider *obj,
+                                  uint64_t **irq_counts,
+                                  unsigned int *nb_irqs)
+{
+    IOAPICCommonState *s = IOAPIC_COMMON(obj);
+
+    *irq_counts = s->irq_count;
+    *nb_irqs = IOAPIC_NUM_PINS;
+
+    return true;
+}
+
 static void ioapic_irr_dump(Monitor *mon, const char *name, uint32_t bitmap)
 {
     int i;
@@ -176,6 +198,7 @@ static void ioapic_common_class_init(ObjectClass *klass, void *data)
     dc->realize = ioapic_common_realize;
     dc->vmsd = &vmstate_ioapic_common;
     ic->print_info = ioapic_print_info;
+    ic->get_statistics = ioapic_get_statistics;
 }
 
 static const TypeInfo ioapic_common_type = {
diff --git a/include/hw/i386/ioapic_internal.h b/include/hw/i386/ioapic_internal.h
index a11d86de46..9848f391bb 100644
--- a/include/hw/i386/ioapic_internal.h
+++ b/include/hw/i386/ioapic_internal.h
@@ -109,10 +109,13 @@ struct IOAPICCommonState {
     uint64_t ioredtbl[IOAPIC_NUM_PINS];
     Notifier machine_done;
     uint8_t version;
+    uint64_t irq_count[IOAPIC_NUM_PINS];
+    int irq_level[IOAPIC_NUM_PINS];
 };
 
 void ioapic_reset_common(DeviceState *dev);
 
 void ioapic_print_redtbl(Monitor *mon, IOAPICCommonState *s);
+void ioapic_stat_update_irq(IOAPICCommonState *s, int irq, int level);
 
 #endif /* QEMU_IOAPIC_INTERNAL_H */