[Qemu-devel] [PATCH 18/21] target-i386: move IOAPIC to ICC bus

[Igor Mammedov <imammedo@redhat.com>]

 * inherit IOAPICs from ICCDevice and attach them to ICC bus
 * map IOAPIC's mmio at board level via indirect icc-bridge
   mmio region that provides address space to IOAPIC via
   icc-bus

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
v3:
 * split out introduction of memory_region_get_address() helper
 * use qdev_get_parent_bus() to get parent bus
v2:
 * do not create IOAPIC in icc-bridge and do not make it QOM child
   of icc-bridge, just attach it to icc-bus.
---
 hw/cpu/icc_bus.c                  |    6 ++++++
 hw/i386/pc.c                      |   10 ++++++----
 hw/intc/ioapic_common.c           |   14 ++++++++++----
 include/hw/cpu/icc_bus.h          |    1 +
 include/hw/i386/ioapic_internal.h |    6 +++---
 5 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/hw/cpu/icc_bus.c b/hw/cpu/icc_bus.c
index 9715e07..b9e4f23 100644
--- a/hw/cpu/icc_bus.c
+++ b/hw/cpu/icc_bus.c
@@ -76,6 +76,7 @@ typedef struct ICCBridgeState {
     SysBusDevice parent_obj;
     ICCBus icc_bus;
     MemoryRegion apic_container;
+    MemoryRegion ioapic_container;
 } ICCBridgeState;
 
 #define ICC_BRIGDE(obj) OBJECT_CHECK(ICCBridgeState, (obj), TYPE_ICC_BRIDGE)
@@ -94,6 +95,11 @@ static void icc_bridge_init(Object *obj)
                        APIC_SPACE_SIZE);
     sysbus_init_mmio(sb, &s->apic_container);
     s->icc_bus.apic_address_space = &s->apic_container;
+
+    /* must be second registered region, board maps it by 1 index */
+    memory_region_init(&s->ioapic_container, "icc-ioapic-container", 0x1000);
+    sysbus_init_mmio(sb, &s->ioapic_container);
+    s->icc_bus.ioapic_address_space = &s->ioapic_container;
 }
 
 static const TypeInfo icc_bridge_info = {
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index a09b7ee..5e50127 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1220,20 +1220,22 @@ void ioapic_init_gsi(GSIState *gsi_state, const char *parent_name)
     DeviceState *dev;
     SysBusDevice *d;
     unsigned int i;
+    BusState *b = BUS(object_resolve_path_type("icc-bus", TYPE_ICC_BUS, NULL));
 
     if (kvm_irqchip_in_kernel()) {
-        dev = qdev_create(NULL, "kvm-ioapic");
+        dev = qdev_create(b, "kvm-ioapic");
     } else {
-        dev = qdev_create(NULL, "ioapic");
+        dev = qdev_create(b, "ioapic");
     }
     if (parent_name) {
         object_property_add_child(object_resolve_path(parent_name, NULL),
                                   "ioapic", OBJECT(dev), NULL);
     }
     qdev_init_nofail(dev);
-    d = SYS_BUS_DEVICE(dev);
-    sysbus_mmio_map(d, 0, IO_APIC_DEFAULT_ADDRESS);
 
+    d = SYS_BUS_DEVICE(object_resolve_path_type("icc-bridge", TYPE_ICC_BRIDGE,
+                                                NULL));
+    sysbus_mmio_map(d, 1, IO_APIC_DEFAULT_ADDRESS);
     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
         gsi_state->ioapic_irq[i] = qdev_get_gpio_in(dev, i);
     }
diff --git a/hw/intc/ioapic_common.c b/hw/intc/ioapic_common.c
index 5c5bb3c..a70d8a2 100644
--- a/hw/intc/ioapic_common.c
+++ b/hw/intc/ioapic_common.c
@@ -57,11 +57,12 @@ static int ioapic_dispatch_post_load(void *opaque, int version_id)
     return 0;
 }
 
-static int ioapic_init_common(SysBusDevice *dev)
+static int ioapic_init_common(ICCDevice *dev)
 {
     IOAPICCommonState *s = IOAPIC_COMMON(dev);
     IOAPICCommonClass *info;
     static int ioapic_no;
+    static bool mmio_registered;
 
     if (ioapic_no >= MAX_IOAPICS) {
         return -1;
@@ -70,7 +71,12 @@ static int ioapic_init_common(SysBusDevice *dev)
     info = IOAPIC_COMMON_GET_CLASS(s);
     info->init(s, ioapic_no);
 
-    sysbus_init_mmio(&s->busdev, &s->io_memory);
+    if (!mmio_registered) {
+        ICCBus *b = ICC_BUS(qdev_get_parent_bus(DEVICE(dev)));
+        memory_region_add_subregion(b->ioapic_address_space, 0, &s->io_memory);
+        mmio_registered = true;
+    }
+
     ioapic_no++;
 
     return 0;
@@ -95,7 +101,7 @@ static const VMStateDescription vmstate_ioapic_common = {
 
 static void ioapic_common_class_init(ObjectClass *klass, void *data)
 {
-    SysBusDeviceClass *sc = SYS_BUS_DEVICE_CLASS(klass);
+    ICCDeviceClass *sc = ICC_DEVICE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     sc->init = ioapic_init_common;
@@ -105,7 +111,7 @@ static void ioapic_common_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo ioapic_common_type = {
     .name = TYPE_IOAPIC_COMMON,
-    .parent = TYPE_SYS_BUS_DEVICE,
+    .parent = TYPE_ICC_DEVICE,
     .instance_size = sizeof(IOAPICCommonState),
     .class_size = sizeof(IOAPICCommonClass),
     .class_init = ioapic_common_class_init,
diff --git a/include/hw/cpu/icc_bus.h b/include/hw/cpu/icc_bus.h
index 53ef223..947125d 100644
--- a/include/hw/cpu/icc_bus.h
+++ b/include/hw/cpu/icc_bus.h
@@ -35,6 +35,7 @@ typedef struct ICCBus {
 
     /*< public >*/
     MemoryRegion *apic_address_space;
+    MemoryRegion *ioapic_address_space;
 } ICCBus;
 
 #define ICC_BUS(obj) OBJECT_CHECK(ICCBus, (obj), TYPE_ICC_BUS)
diff --git a/include/hw/i386/ioapic_internal.h b/include/hw/i386/ioapic_internal.h
index 25576c8..8d5fe3d 100644
--- a/include/hw/i386/ioapic_internal.h
+++ b/include/hw/i386/ioapic_internal.h
@@ -24,7 +24,7 @@
 
 #include "hw/hw.h"
 #include "exec/memory.h"
-#include "hw/sysbus.h"
+#include "hw/cpu/icc_bus.h"
 
 #define MAX_IOAPICS                     1
 
@@ -82,14 +82,14 @@ typedef struct IOAPICCommonState IOAPICCommonState;
      OBJECT_GET_CLASS(IOAPICCommonClass, (obj), TYPE_IOAPIC_COMMON)
 
 typedef struct IOAPICCommonClass {
-    SysBusDeviceClass parent_class;
+    ICCDeviceClass parent_class;
     void (*init)(IOAPICCommonState *s, int instance_no);
     void (*pre_save)(IOAPICCommonState *s);
     void (*post_load)(IOAPICCommonState *s);
 } IOAPICCommonClass;
 
 struct IOAPICCommonState {
-    SysBusDevice busdev;
+    ICCDevice busdev;
     MemoryRegion io_memory;
     uint8_t id;
     uint8_t ioregsel;
-- 
1.7.1