[Qemu-devel] [PATCH 12/21] target-i386: introduce ICC bus/device/bridge

[Igor Mammedov <imammedo@redhat.com>]

Provides hotplug-able bus for APIC and CPU.

* icc-bridge will serve as a parent for icc-bus and provide
  mmio mapping services to child icc-devices.
* icc-device will replace SysBusDevice as a parent of APIC
  and IOAPIC devices.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
v3:
  * mv include/hw/i386/icc_bus.h into include/hw/cpu/
  * various style fixes
  * embed icc-bus inside icc-bridge and use qbus_create_inplace()
  * update MAINTAINERS with new files
v2:
  * Rebase on top the last HW reorganization series.
  * Move hw/icc_bus.c into hw/cpu/ and hw/icc_bus.h include/hw/i386/
---
 MAINTAINERS                        |    6 ++
 default-configs/i386-softmmu.mak   |    1 +
 default-configs/x86_64-softmmu.mak |    1 +
 hw/cpu/Makefile.objs               |    1 +
 hw/cpu/icc_bus.c                   |  104 ++++++++++++++++++++++++++++++++++++
 hw/i386/pc_piix.c                  |    7 +++
 hw/i386/pc_q35.c                   |    7 +++
 include/hw/cpu/icc_bus.h           |   58 ++++++++++++++++++++
 8 files changed, 185 insertions(+), 0 deletions(-)
 create mode 100644 hw/cpu/icc_bus.c
 create mode 100644 include/hw/cpu/icc_bus.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 4dfd8bf..be02724 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -644,6 +644,12 @@ F: qom/cpu.c
 F: include/qemu/cpu.h
 F: target-i386/cpu.c
 
+ICC Bus
+M: Igor Mammedov <imammedo@redhat.com>
+S: Supported
+F: include/hw/cpu/icc_bus.h
+F: hw/cpu/icc_bus.c
+
 Device Tree
 M: Peter Crosthwaite <peter.crosthwaite@petalogix.com>
 M: Alexander Graf <agraf@suse.de>
diff --git a/default-configs/i386-softmmu.mak b/default-configs/i386-softmmu.mak
index 368a776..833e722 100644
--- a/default-configs/i386-softmmu.mak
+++ b/default-configs/i386-softmmu.mak
@@ -44,3 +44,4 @@ CONFIG_LPC_ICH9=y
 CONFIG_PCI_Q35=y
 CONFIG_APIC=y
 CONFIG_IOAPIC=y
+CONFIG_ICC_BUS=y
diff --git a/default-configs/x86_64-softmmu.mak b/default-configs/x86_64-softmmu.mak
index 2711b83..b749eb7 100644
--- a/default-configs/x86_64-softmmu.mak
+++ b/default-configs/x86_64-softmmu.mak
@@ -44,3 +44,4 @@ CONFIG_LPC_ICH9=y
 CONFIG_PCI_Q35=y
 CONFIG_APIC=y
 CONFIG_IOAPIC=y
+CONFIG_ICC_BUS=y
diff --git a/hw/cpu/Makefile.objs b/hw/cpu/Makefile.objs
index a49ca04..4461ece 100644
--- a/hw/cpu/Makefile.objs
+++ b/hw/cpu/Makefile.objs
@@ -1,4 +1,5 @@
 obj-$(CONFIG_ARM11MPCORE) += arm11mpcore.o
 obj-$(CONFIG_ARM9MPCORE) += a9mpcore.o
 obj-$(CONFIG_ARM15MPCORE) += a15mpcore.o
+obj-$(CONFIG_ICC_BUS) += icc_bus.o
 
diff --git a/hw/cpu/icc_bus.c b/hw/cpu/icc_bus.c
new file mode 100644
index 0000000..f6091b9
--- /dev/null
+++ b/hw/cpu/icc_bus.c
@@ -0,0 +1,104 @@
+/* icc_bus.c
+ * emulate x86 ICC(Interrupt Controller Communications) bus
+ *
+ * Copyright (c) 2013 Red Hat, Inc
+ *
+ * Authors:
+ *     Igor Mammedov <imammedo@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+#include "hw/cpu/icc_bus.h"
+#include "hw/sysbus.h"
+
+/* icc-bridge implementation */
+static void icc_bus_init(Object *obj)
+{
+    BusState *b = BUS(obj);
+
+    b->allow_hotplug = true;
+}
+
+static const TypeInfo icc_bus_info = {
+    .name = TYPE_ICC_BUS,
+    .parent = TYPE_BUS,
+    .instance_size = sizeof(ICCBus),
+    .instance_init = icc_bus_init,
+};
+
+/* icc-device implementation */
+static void icc_device_realizefn(DeviceState *dev, Error **err)
+{
+    ICCDevice *id = ICC_DEVICE(dev);
+    ICCDeviceClass *k = ICC_DEVICE_GET_CLASS(id);
+    Error *local_err = NULL;
+
+    if (k->init) {
+        if (k->init(id) < 0) {
+            error_setg(&local_err, "%s initialization failed.",
+                       object_get_typename(OBJECT(dev)));
+            error_propagate(err, local_err);
+        }
+    }
+}
+
+static void icc_device_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *k = DEVICE_CLASS(klass);
+
+    k->realize = icc_device_realizefn;
+    k->bus_type = TYPE_ICC_BUS;
+}
+
+static const TypeInfo icc_device_info = {
+    .name = TYPE_ICC_DEVICE,
+    .parent = TYPE_DEVICE,
+    .abstract = true,
+    .instance_size = sizeof(ICCDevice),
+    .class_size = sizeof(ICCDeviceClass),
+    .class_init = icc_device_class_init,
+};
+
+/*  icc-bridge implementation */
+typedef struct ICCBridgeState {
+    /*< private >*/
+    SysBusDevice parent_obj;
+    ICCBus icc_bus;
+} ICCBridgeState;
+
+#define ICC_BRIGDE(obj) OBJECT_CHECK(ICCBridgeState, (obj), TYPE_ICC_BRIDGE)
+
+static void icc_bridge_init(Object *obj)
+{
+    ICCBridgeState *s = ICC_BRIGDE(obj);
+
+    qbus_create_inplace(&s->icc_bus, TYPE_ICC_BUS, DEVICE(s), "icc-bus");
+}
+
+static const TypeInfo icc_bridge_info = {
+    .name  = TYPE_ICC_BRIDGE,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_init  = icc_bridge_init,
+    .instance_size  = sizeof(ICCBridgeState),
+};
+
+
+static void icc_bus_register_types(void)
+{
+    type_register_static(&icc_bus_info);
+    type_register_static(&icc_device_info);
+    type_register_static(&icc_bridge_info);
+}
+
+type_init(icc_bus_register_types)
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 943758a..9a6f9fe 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -37,6 +37,7 @@
 #include "hw/kvm/clock.h"
 #include "sysemu/sysemu.h"
 #include "hw/sysbus.h"
+#include "hw/cpu/icc_bus.h"
 #include "sysemu/arch_init.h"
 #include "sysemu/blockdev.h"
 #include "hw/i2c/smbus.h"
@@ -85,8 +86,13 @@ static void pc_init1(MemoryRegion *system_memory,
     MemoryRegion *ram_memory;
     MemoryRegion *pci_memory;
     MemoryRegion *rom_memory;
+    DeviceState *icc_bridge;
     void *fw_cfg = NULL;
 
+    icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
+    object_property_add_child(qdev_get_machine(), "icc-bridge",
+                              OBJECT(icc_bridge), NULL);
+
     pc_cpus_init(cpu_model);
     pc_acpi_init("acpi-dsdt.aml");
 
@@ -161,6 +167,7 @@ static void pc_init1(MemoryRegion *system_memory,
     if (pci_enabled) {
         ioapic_init_gsi(gsi_state, "i440fx");
     }
+    qdev_init_nofail(icc_bridge);
 
     pc_register_ferr_irq(gsi[13]);
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 6ac1a89..64c5a6c 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -41,6 +41,7 @@
 #include "hw/ide/pci.h"
 #include "hw/ide/ahci.h"
 #include "hw/usb.h"
+#include "hw/cpu/icc_bus.h"
 
 /* ICH9 AHCI has 6 ports */
 #define MAX_SATA_PORTS     6
@@ -85,6 +86,11 @@ static void pc_q35_init(QEMUMachineInitArgs *args)
     ICH9LPCState *ich9_lpc;
     PCIDevice *ahci;
     qemu_irq *cmos_s3;
+    DeviceState *icc_bridge;
+
+    icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
+    object_property_add_child(qdev_get_machine(), "icc-bridge",
+                              OBJECT(icc_bridge), NULL);
 
     pc_cpus_init(cpu_model);
     pc_acpi_init("q35-acpi-dsdt.aml");
@@ -168,6 +174,7 @@ static void pc_q35_init(QEMUMachineInitArgs *args)
     if (pci_enabled) {
         ioapic_init_gsi(gsi_state, NULL);
     }
+    qdev_init_nofail(icc_bridge);
 
     pc_register_ferr_irq(gsi[13]);
 
diff --git a/include/hw/cpu/icc_bus.h b/include/hw/cpu/icc_bus.h
new file mode 100644
index 0000000..a0abc21
--- /dev/null
+++ b/include/hw/cpu/icc_bus.h
@@ -0,0 +1,58 @@
+/* icc_bus.h
+ * emulate x86 ICC(Interrupt Controller Communications) bus
+ *
+ * Copyright (c) 2013 Red Hat, Inc
+ *
+ * Authors:
+ *     Igor Mammedov <imammedo@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+#ifndef ICC_BUS_H
+#define ICC_BUS_H
+
+#include "hw/qdev-core.h"
+
+#define TYPE_ICC_BUS "icc-bus"
+
+#ifndef CONFIG_USER_ONLY
+
+typedef struct ICCBus {
+    /*< private >*/
+    BusState parent_obj;
+} ICCBus;
+
+#define ICC_BUS(obj) OBJECT_CHECK(ICCBus, (obj), TYPE_ICC_BUS)
+
+typedef struct ICCDevice {
+    /*< public >*/
+    DeviceState qdev;
+} ICCDevice;
+
+typedef struct ICCDeviceClass {
+    DeviceClass parent_class;
+    int (*init)(ICCDevice *dev);
+} ICCDeviceClass;
+
+#define TYPE_ICC_DEVICE "icc-device"
+#define ICC_DEVICE(obj) OBJECT_CHECK(ICCDevice, (obj), TYPE_ICC_DEVICE)
+#define ICC_DEVICE_CLASS(klass) \
+     OBJECT_CLASS_CHECK(ICCDeviceClass, (klass), TYPE_ICC_DEVICE)
+#define ICC_DEVICE_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(ICCDeviceClass, (obj), TYPE_ICC_DEVICE)
+
+#define TYPE_ICC_BRIDGE "icc-bridge"
+
+#endif /* CONFIG_USER_ONLY */
+#endif
-- 
1.7.1