xics: split to xics and xics-common

The upcoming XICS-KVM support will use bits of emulated XICS code.
So this introduces new level of hierarchy - "xics-common" class. Both
emulated XICS and XICS-KVM will inherit from it and override class
callbacks when required.

The new "xics-common" class implements:
1. replaces static "nr_irqs" and "nr_servers" properties with
the dynamic ones and adds callbacks to be executed when properties
are set.
2. xics_cpu_setup() callback renamed to xics_common_cpu_setup() as
it is a common part for both XICS'es
3. xics_reset() renamed to xics_common_reset() for the same reason.

The emulated XICS changes:
1. the part of xics_realize() which creates ICPs is moved to
the "nr_servers" property callback as realize() is too late to
create/initialize devices and instance_init() is too early to create
devices as the number of child devices comes via the "nr_servers"
property.
2. added ics_initfn() which does a little part of what xics_realize() did.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 20 insertions, 0 deletions

diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
index 6e3b605..7e702a0 100644
--- a/include/hw/ppc/xics.h
+++ b/include/hw/ppc/xics.h
@@ -29,9 +29,21 @@
 
 #include "hw/sysbus.h"
 
+#define TYPE_XICS_COMMON "xics-common"
+#define XICS_COMMON(obj) OBJECT_CHECK(XICSState, (obj), TYPE_XICS_COMMON)
+
 #define TYPE_XICS "xics"
 #define XICS(obj) OBJECT_CHECK(XICSState, (obj), TYPE_XICS)
 
+#define XICS_COMMON_CLASS(klass) \
+     OBJECT_CLASS_CHECK(XICSStateClass, (klass), TYPE_XICS_COMMON)
+#define XICS_CLASS(klass) \
+     OBJECT_CLASS_CHECK(XICSStateClass, (klass), TYPE_XICS)
+#define XICS_COMMON_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(XICSStateClass, (obj), TYPE_XICS_COMMON)
+#define XICS_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(XICSStateClass, (obj), TYPE_XICS)
+
 #define XICS_IPI        0x2
 #define XICS_BUID       0x1
 #define XICS_IRQ_BASE   (XICS_BUID << 12)
@@ -41,6 +53,7 @@
  * (the kernel implementation supports more but we don't exploit
  *  that yet)
  */
+typedef struct XICSStateClass XICSStateClass;
 typedef struct XICSState XICSState;
 typedef struct ICPStateClass ICPStateClass;
 typedef struct ICPState ICPState;
@@ -48,6 +61,13 @@ typedef struct ICSStateClass ICSStateClass;
 typedef struct ICSState ICSState;
 typedef struct ICSIRQState ICSIRQState;
 
+struct XICSStateClass {
+    DeviceClass parent_class;
+
+    void (*set_nr_irqs)(XICSState *icp, uint32_t nr_irqs, Error **errp);
+    void (*set_nr_servers)(XICSState *icp, uint32_t nr_servers, Error **errp);
+};
+
 struct XICSState {
     /*< private >*/
     SysBusDevice parent_obj;