intc: add an interface to gather statistics/informations on interrupt controllers

This interface will be used by HMP commands 'info irq' and 'info pic'.

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
Message-Id: <1474921408-24710-2-git-send-email-hpoussin@reactos.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/intc/Makefile.objs

@@ -17,6 +17,7 @@ common-obj-$(CONFIG_ARM_GIC) += arm_gicv3.o
 common-obj-$(CONFIG_ARM_GIC) += arm_gicv3_dist.o
 common-obj-$(CONFIG_ARM_GIC) += arm_gicv3_redist.o
 common-obj-$(CONFIG_OPENPIC) += openpic.o
+common-obj-y += intc.o
 
 obj-$(CONFIG_APIC) += apic.o apic_common.o
 obj-$(CONFIG_ARM_GIC_KVM) += arm_gic_kvm.o

hw/intc/intc.c

@@ -0,0 +1,41 @@
+/*
+ * QEMU Generic Interrupt Controller
+ *
+ * Copyright (c) 2016 Hervé Poussineau
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/intc/intc.h"
+#include "qemu/module.h"
+
+static const TypeInfo intctrl_info = {
+    .name = TYPE_INTERRUPT_STATS_PROVIDER,
+    .parent = TYPE_INTERFACE,
+    .class_size = sizeof(InterruptStatsProviderClass),
+};
+
+static void intc_register_types(void)
+{
+    type_register_static(&intctrl_info);
+}
+
+type_init(intc_register_types)
+

include/hw/intc/intc.h

@@ -0,0 +1,33 @@
+#ifndef INTC_H
+#define INTC_H
+
+#include "qom/object.h"
+
+#define TYPE_INTERRUPT_STATS_PROVIDER "intctrl"
+
+#define INTERRUPT_STATS_PROVIDER_CLASS(klass) \
+    OBJECT_CLASS_CHECK(InterruptStatsProviderClass, (klass), \
+                       TYPE_INTERRUPT_STATS_PROVIDER)
+#define INTERRUPT_STATS_PROVIDER_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(InterruptStatsProviderClass, (obj), \
+                     TYPE_INTERRUPT_STATS_PROVIDER)
+#define INTERRUPT_STATS_PROVIDER(obj) \
+    INTERFACE_CHECK(InterruptStatsProvider, (obj), \
+                    TYPE_INTERRUPT_STATS_PROVIDER)
+
+typedef struct InterruptStatsProvider {
+    Object parent;
+} InterruptStatsProvider;
+
+typedef struct InterruptStatsProviderClass {
+    InterfaceClass parent;
+
+    /* The returned pointer and statistics must remain valid until
+     * the BQL is next dropped.
+     */
+    bool (*get_statistics)(InterruptStatsProvider *obj, uint64_t **irq_counts,
+                           unsigned int *nb_irqs);
+    void (*print_info)(InterruptStatsProvider *obj, Monitor *mon);
+} InterruptStatsProviderClass;
+
+#endif