ppc/pnv: Link "psi" property to PnvOCC::psi pointer

The OCC object has both a pointer and a "psi" property pointing to the
PSI object. Confusing bugs could arise if these ever go out of sync.

Change the property definition so that it explicitely sets the pointer.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157383334894.165747.7617090757862105199.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

2 files changed, 13 insertions, 15 deletions

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 201facc701..ce24a4ee99 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -904,8 +904,6 @@ static void pnv_chip_power8_instance_init(Object *obj)
 
     object_initialize_child(obj, "occ",  &chip8->occ, sizeof(chip8->occ),
                             TYPE_PNV8_OCC, &error_abort, NULL);
-    object_property_add_const_link(OBJECT(&chip8->occ), "psi",
-                                   OBJECT(&chip8->psi), &error_abort);
 
     object_initialize_child(obj, "homer",  &chip8->homer, sizeof(chip8->homer),
                             TYPE_PNV8_HOMER, &error_abort, NULL);
@@ -1000,6 +998,8 @@ static void pnv_chip_power8_realize(DeviceState *dev, Error **errp)
     }
 
     /* Create the simplified OCC model */
+    object_property_set_link(OBJECT(&chip8->occ), OBJECT(&chip8->psi), "psi",
+                             &error_abort);
     object_property_set_bool(OBJECT(&chip8->occ), true, "realized", &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
@@ -1102,8 +1102,6 @@ static void pnv_chip_power9_instance_init(Object *obj)
 
     object_initialize_child(obj, "occ",  &chip9->occ, sizeof(chip9->occ),
                             TYPE_PNV9_OCC, &error_abort, NULL);
-    object_property_add_const_link(OBJECT(&chip9->occ), "psi",
-                                   OBJECT(&chip9->psi), &error_abort);
 
     object_initialize_child(obj, "homer",  &chip9->homer, sizeof(chip9->homer),
                             TYPE_PNV9_HOMER, &error_abort, NULL);
@@ -1211,6 +1209,8 @@ static void pnv_chip_power9_realize(DeviceState *dev, Error **errp)
                                             (uint64_t) PNV9_LPCM_BASE(chip));
 
     /* Create the simplified OCC model */
+    object_property_set_link(OBJECT(&chip9->occ), OBJECT(&chip9->psi), "psi",
+                             &error_abort);
     object_property_set_bool(OBJECT(&chip9->occ), true, "realized", &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
diff --git a/hw/ppc/pnv_occ.c b/hw/ppc/pnv_occ.c
index 785653bb67..765c0a6ce5 100644
--- a/hw/ppc/pnv_occ.c
+++ b/hw/ppc/pnv_occ.c
@@ -21,7 +21,7 @@
 #include "qapi/error.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
-
+#include "hw/qdev-properties.h"
 #include "hw/ppc/pnv.h"
 #include "hw/ppc/pnv_xscom.h"
 #include "hw/ppc/pnv_occ.h"
@@ -257,18 +257,10 @@ static void pnv_occ_realize(DeviceState *dev, Error **errp)
 {
     PnvOCC *occ = PNV_OCC(dev);
     PnvOCCClass *poc = PNV_OCC_GET_CLASS(occ);
-    Object *obj;
-    Error *local_err = NULL;
 
-    occ->occmisc = 0;
+    assert(occ->psi);
 
-    obj = object_property_get_link(OBJECT(dev), "psi", &local_err);
-    if (!obj) {
-        error_propagate(errp, local_err);
-        error_prepend(errp, "required link 'psi' not found: ");
-        return;
-    }
-    occ->psi = PNV_PSI(obj);
+    occ->occmisc = 0;
 
     /* XScom region for OCC registers */
     pnv_xscom_region_init(&occ->xscom_regs, OBJECT(dev), poc->xscom_ops,
@@ -279,12 +271,18 @@ static void pnv_occ_realize(DeviceState *dev, Error **errp)
                           occ, "occ-common-area", poc->sram_size);
 }
 
+static Property pnv_occ_properties[] = {
+    DEFINE_PROP_LINK("psi", PnvOCC, psi, TYPE_PNV_PSI, PnvPsi *),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static void pnv_occ_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->realize = pnv_occ_realize;
     dc->desc = "PowerNV OCC Controller";
+    dc->props = pnv_occ_properties;
 }
 
 static const TypeInfo pnv_occ_type_info = {