s390x/event-facility: code restructure

Code restructure in order to simplify class hierarchy
  - remove S390SCLPDevice abstract base class
    and move function pointers into new SCLPEventFacilityClass
  - implement SCLPEventFacility as SysBusDevice
  - use define constants for instance creation strings

The following ascii-art shows the class structure wrt the SCLP EventFacility
before (CURRENT) and after the restructure (NEW):

----
CURRENT:

   "s390-sclp-events-bus"
   +-------------------------+
   |      SCLPEventsBus      |
   |-------------------------|
   |BusState qbus            |
   +-------------------------+

   +-------------------------+
   |   SCLPEventFacility     |  - to be replaced by new SCLPEventFacility,
   |-------------------------|    which will be a SysBusDevice
   |SCLPEventsBus sbus       |
   |DeviceState *qdev        |
   |unsigned int receive_mask|
   +-------------------------+

   +-------------------------+
   |   S390SCLPDeviceClass   |  - to be replaced by new SCLPEventFacilityClass
   |-------------------------|
   |DeviceClass qdev         |
   |*(init)()                |
   +-------------------------+

   "s390-sclp-event-facility"
             |
         instance-of
             |
             V
   "s390-sclp-device"           - this is an abstract class
   +-------------------------+
   |     S390SCLPDevice   (A)|  - to be replaced by new SCLPEventFacility
   |-------------------------|
   |SysBusDevice busdev      |
   |SCLPEventFacility *ef    |
   |                         |
   |*(sclp_command_handler)()|  - these 2 go to new SCLPEventFacilityClass
   |*(event_pending)()       |
   +-------------------------+

----
NEW:

   "s390-sclp-events-bus"
   +-------------------------+
   |      SCLPEventsBus      |
   |-------------------------|
   |BusState qbus            |
   +-------------------------+

   +-------------------------+
   | SCLPEventFacilityClass  |
   |-------------------------|
   |DeviceClass parent_class |
   |                         |
   |*(init)()                |
   |*(command_handler)()     |
   |*(event_pending)()       |
   +-------------------------+

   "s390-sclp-event-facility"
   +-------------------------+
   |   SCLPEventFacility     |
   |-------------------------|
   |SysBusDevice parent_class|
   |SCLPEventsBus sbus       |
   |unsigned int receive_mask|
   +-------------------------+

Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 12 insertions, 46 deletions

diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
index 98809777c8..d8ddf35e58 100644
--- a/hw/s390x/sclp.c
+++ b/hw/s390x/sclp.c
@@ -18,11 +18,12 @@
 #include "sysemu/sysemu.h"
 
 #include "hw/s390x/sclp.h"
+#include "hw/s390x/event-facility.h"
 
-static inline S390SCLPDevice *get_event_facility(void)
+static inline SCLPEventFacility *get_event_facility(void)
 {
     ObjectProperty *op = object_property_find(qdev_get_machine(),
-                                              "s390-sclp-event-facility",
+                                              TYPE_SCLP_EVENT_FACILITY,
                                               NULL);
     assert(op);
     return op->opaque;
@@ -91,7 +92,8 @@ static void sclp_read_cpu_info(SCCB *sccb)
 
 static void sclp_execute(SCCB *sccb, uint32_t code)
 {
-    S390SCLPDevice *sdev = get_event_facility();
+    SCLPEventFacility *ef = get_event_facility();
+    SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
 
     switch (code & SCLP_CMD_CODE_MASK) {
     case SCLP_CMDW_READ_SCP_INFO:
@@ -102,7 +104,7 @@ static void sclp_execute(SCCB *sccb, uint32_t code)
         sclp_read_cpu_info(sccb);
         break;
     default:
-        sdev->sclp_command_handler(sdev->ef, sccb, code);
+        efc->command_handler(ef, sccb, code);
         break;
     }
 }
@@ -156,11 +158,13 @@ out:
 
 void sclp_service_interrupt(uint32_t sccb)
 {
-    S390SCLPDevice *sdev = get_event_facility();
+    SCLPEventFacility *ef = get_event_facility();
+    SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
+
     uint32_t param = sccb & ~3;
 
     /* Indicate whether an event is still pending */
-    param |= sdev->event_pending(sdev->ef) ? 1 : 0;
+    param |= efc->event_pending(ef) ? 1 : 0;
 
     if (!param) {
         /* No need to send an interrupt, there's nothing to be notified about */
@@ -173,47 +177,9 @@ void sclp_service_interrupt(uint32_t sccb)
 
 void s390_sclp_init(void)
 {
-    DeviceState *dev  = qdev_create(NULL, "s390-sclp-event-facility");
+    DeviceState *dev  = qdev_create(NULL, TYPE_SCLP_EVENT_FACILITY);
 
-    object_property_add_child(qdev_get_machine(), "s390-sclp-event-facility",
+    object_property_add_child(qdev_get_machine(), TYPE_SCLP_EVENT_FACILITY,
                               OBJECT(dev), NULL);
     qdev_init_nofail(dev);
 }
-
-static int s390_sclp_dev_init(SysBusDevice *dev)
-{
-    int r;
-    S390SCLPDevice *sdev = (S390SCLPDevice *)dev;
-    S390SCLPDeviceClass *sclp = SCLP_S390_DEVICE_GET_CLASS(dev);
-
-    r = sclp->init(sdev);
-    if (!r) {
-        assert(sdev->event_pending);
-        assert(sdev->sclp_command_handler);
-    }
-
-    return r;
-}
-
-static void s390_sclp_device_class_init(ObjectClass *klass, void *data)
-{
-    SysBusDeviceClass *dc = SYS_BUS_DEVICE_CLASS(klass);
-
-    dc->init = s390_sclp_dev_init;
-}
-
-static const TypeInfo s390_sclp_device_info = {
-    .name = TYPE_DEVICE_S390_SCLP,
-    .parent = TYPE_SYS_BUS_DEVICE,
-    .instance_size = sizeof(S390SCLPDevice),
-    .class_init = s390_sclp_device_class_init,
-    .class_size = sizeof(S390SCLPDeviceClass),
-    .abstract = true,
-};
-
-static void s390_sclp_register_types(void)
-{
-    type_register_static(&s390_sclp_device_info);
-}
-
-type_init(s390_sclp_register_types)