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

The LPC 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: <157383334342.165747.3159314903077305653.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

2 files changed, 12 insertions, 15 deletions

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 4e9ddc0..201facc 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -901,8 +901,6 @@ static void pnv_chip_power8_instance_init(Object *obj)
 
     object_initialize_child(obj, "lpc",  &chip8->lpc, sizeof(chip8->lpc),
                             TYPE_PNV8_LPC, &error_abort, NULL);
-    object_property_add_const_link(OBJECT(&chip8->lpc), "psi",
-                                   OBJECT(&chip8->psi), &error_abort);
 
     object_initialize_child(obj, "occ",  &chip8->occ, sizeof(chip8->occ),
                             TYPE_PNV8_OCC, &error_abort, NULL);
@@ -981,6 +979,8 @@ static void pnv_chip_power8_realize(DeviceState *dev, Error **errp)
                             &PNV_PSI(psi8)->xscom_regs);
 
     /* Create LPC controller */
+    object_property_set_link(OBJECT(&chip8->lpc), OBJECT(&chip8->psi), "psi",
+                             &error_abort);
     object_property_set_bool(OBJECT(&chip8->lpc), true, "realized",
                              &error_fatal);
     pnv_xscom_add_subregion(chip, PNV_XSCOM_LPC_BASE, &chip8->lpc.xscom_regs);
@@ -1099,8 +1099,6 @@ static void pnv_chip_power9_instance_init(Object *obj)
 
     object_initialize_child(obj, "lpc",  &chip9->lpc, sizeof(chip9->lpc),
                             TYPE_PNV9_LPC, &error_abort, NULL);
-    object_property_add_const_link(OBJECT(&chip9->lpc), "psi",
-                                   OBJECT(&chip9->psi), &error_abort);
 
     object_initialize_child(obj, "occ",  &chip9->occ, sizeof(chip9->occ),
                             TYPE_PNV9_OCC, &error_abort, NULL);
@@ -1199,6 +1197,8 @@ static void pnv_chip_power9_realize(DeviceState *dev, Error **errp)
                             &PNV_PSI(psi9)->xscom_regs);
 
     /* LPC */
+    object_property_set_link(OBJECT(&chip9->lpc), OBJECT(&chip9->psi), "psi",
+                             &error_abort);
     object_property_set_bool(OBJECT(&chip9->lpc), true, "realized", &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
diff --git a/hw/ppc/pnv_lpc.c b/hw/ppc/pnv_lpc.c
index 9466d4a..fb9f930 100644
--- a/hw/ppc/pnv_lpc.c
+++ b/hw/ppc/pnv_lpc.c
@@ -24,7 +24,7 @@
 #include "qemu/module.h"
 #include "hw/irq.h"
 #include "hw/isa/isa.h"
-
+#include "hw/qdev-properties.h"
 #include "hw/ppc/pnv.h"
 #include "hw/ppc/pnv_lpc.h"
 #include "hw/ppc/pnv_xscom.h"
@@ -682,17 +682,8 @@ static const TypeInfo pnv_lpc_power9_info = {
 static void pnv_lpc_realize(DeviceState *dev, Error **errp)
 {
     PnvLpcController *lpc = PNV_LPC(dev);
-    Object *obj;
-    Error *local_err = NULL;
 
-    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;
-    }
-    /* The LPC controller needs PSI to generate interrupts  */
-    lpc->psi = PNV_PSI(obj);
+    assert(lpc->psi);
 
     /* Reg inits */
     lpc->lpc_hc_fw_rd_acc_size = LPC_HC_FW_RD_4B;
@@ -734,12 +725,18 @@ static void pnv_lpc_realize(DeviceState *dev, Error **errp)
                                 &lpc->lpc_hc_regs);
 }
 
+static Property pnv_lpc_properties[] = {
+    DEFINE_PROP_LINK("psi", PnvLpcController, psi, TYPE_PNV_PSI, PnvPsi *),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static void pnv_lpc_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->realize = pnv_lpc_realize;
     dc->desc = "PowerNV LPC Controller";
+    dc->props = pnv_lpc_properties;
 }
 
 static const TypeInfo pnv_lpc_info = {