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[Qemu-devel] [PULL 25/50] xics: XICS should not be a SysBusDevice

From: David Gibson
Subject: [Qemu-devel] [PULL 25/50] xics: XICS should not be a SysBusDevice
Date: Wed, 1 Mar 2017 15:43:40 +1100

Currently xics - the component of the IBM POWER interrupt controller
representing the overall interrupt fabric / architecture is
represented as a descendent of SysBusDevice.  However, this is not
really correct - the xics presents nothing in MMIO space so it should
be an "unattached" device in the current QOM model.

Since this device will always be created by the machine type, not created
specifically from the command line, and because it has no migrated state
it should be safe to move it around the device composition tree.

Therefore this patch changes it to a descendent of TYPE_DEVICE, and
makes it an unattached device.  So that its reset handler still gets
called correctly, we add a qdev_set_parent_bus() to attach it to
sysbus.  It's not really clear that's correct (instead of using
register_reset()) but it appears to a common technique.

Signed-off-by: David Gibson <address@hidden>
[clg corrected problems with reset]
Signed-off-by: C├ędric Le Goater <address@hidden>
[dwg folded together and updated commit message]
Signed-off-by: David Gibson <address@hidden>
 hw/intc/xics.c        | 2 +-
 hw/ppc/spapr.c        | 3 ++-
 include/hw/ppc/xics.h | 2 +-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/hw/intc/xics.c b/hw/intc/xics.c
index 095c16a..372b831 100644
--- a/hw/intc/xics.c
+++ b/hw/intc/xics.c
@@ -260,7 +260,7 @@ static void xics_common_class_init(ObjectClass *oc, void 
 static const TypeInfo xics_common_info = {
     .name          = TYPE_XICS_COMMON,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_DEVICE,
     .instance_size = sizeof(XICSState),
     .class_size    = sizeof(XICSStateClass),
     .instance_init = xics_common_initfn,
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index e0bb9bc..0c475f4 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -101,9 +101,10 @@ static XICSState *try_create_xics(const char *type, int 
     Error *err = NULL;
     DeviceState *dev;
-    dev = qdev_create(NULL, type);
+    dev = DEVICE(object_new(type));
     qdev_prop_set_uint32(dev, "nr_servers", nr_servers);
     qdev_prop_set_uint32(dev, "nr_irqs", nr_irqs);
+    qdev_set_parent_bus(dev, sysbus_get_default());
     object_property_set_bool(OBJECT(dev), true, "realized", &err);
     if (err) {
         error_propagate(errp, err);
diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
index 3f0c316..1aefd3d 100644
--- a/include/hw/ppc/xics.h
+++ b/include/hw/ppc/xics.h
@@ -80,7 +80,7 @@ struct XICSStateClass {
 struct XICSState {
     /*< private >*/
-    SysBusDevice parent_obj;
+    DeviceState parent_obj;
     /*< public >*/
     uint32_t nr_servers;
     uint32_t nr_irqs;

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