[PATCH v3 07/10] ppc/pnv: move PHB4 related XSCOM init to phb4_realize()

[Daniel Henrique Barboza <danielhb413@gmail.com>]

Before enabling pnv-phb4 user creatable devices we need to handle PHB4
specific code in pnv_pec_stk_realize().

The 'stack->phb_regs_mr' PHB4 passthrough XSCOM initialization relies on
'stack->phb' being not NULL. Moving 'stack->phb_regs_mr' region_init()
and add_subregion() to phb4_realize() time is a natural thing to do and
it'll spare us from checking 'phb->stack != NULL' in stk_realize() when
user creatable pnv-phb4s are implemented.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb4.c     | 27 +++++++++++++++++++++++++++
 hw/pci-host/pnv_phb4_pec.c | 10 ----------
 2 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/hw/pci-host/pnv_phb4.c b/hw/pci-host/pnv_phb4.c
index 1a7395772f..152911a285 100644
--- a/hw/pci-host/pnv_phb4.c
+++ b/hw/pci-host/pnv_phb4.c
@@ -1194,6 +1194,31 @@ void pnv_phb4_set_stack_phb_props(PnvPhb4PecStack *stack,
                              &error_abort);
 }
 
+static void pnv_phb4_init_xscom_passthrough(PnvPHB4 *phb)
+{
+    PnvPhb4PecState *pec;
+    PnvPhb4PecClass *pecc;
+    uint32_t pec_pci_base;
+    char name[64];
+
+    assert(phb->stack);
+
+    pec = phb->stack->pec;
+    pecc = PNV_PHB4_PEC_GET_CLASS(pec);
+    pec_pci_base = pecc->xscom_pci_base(pec);
+
+    /* PHB pass-through */
+    snprintf(name, sizeof(name), "xscom-pec-%d.%d-pci-stack-%d-phb",
+             pec->chip_id, pec->index, phb->stack->stack_no);
+    pnv_xscom_region_init(&phb->stack->phb_regs_mr, OBJECT(phb),
+                          &pnv_phb4_xscom_ops, phb, name, 0x40);
+
+    pnv_xscom_add_subregion(pec->chip,
+                            pec_pci_base + PNV9_XSCOM_PEC_PCI_STK0 +
+                            0x40 * phb->stack->stack_no,
+                            &phb->stack->phb_regs_mr);
+}
+
 static void pnv_phb4_instance_init(Object *obj)
 {
     PnvPHB4 *phb = PNV_PHB4(obj);
@@ -1223,6 +1248,8 @@ static void pnv_phb4_realize(DeviceState *dev, Error **errp)
     memory_region_init_io(&phb->mr_regs, OBJECT(phb), &pnv_phb4_reg_ops, phb,
                           name, 0x2000);
 
+    pnv_phb4_init_xscom_passthrough(phb);
+
     /*
      * PHB4 doesn't support IO space. However, qemu gets very upset if
      * we don't have an IO region to anchor IO BARs onto so we just
diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
index 042dc0b775..5e02a51f04 100644
--- a/hw/pci-host/pnv_phb4_pec.c
+++ b/hw/pci-host/pnv_phb4_pec.c
@@ -571,12 +571,6 @@ static void pnv_pec_stk_realize(DeviceState *dev, Error **errp)
                           &pnv_pec_stk_pci_xscom_ops, stack, name,
                           PHB4_PEC_PCI_STK_REGS_COUNT);
 
-    /* PHB pass-through */
-    snprintf(name, sizeof(name), "xscom-pec-%d.%d-pci-stack-%d-phb",
-             pec->chip_id, pec->index, stack->stack_no);
-    pnv_xscom_region_init(&stack->phb_regs_mr, OBJECT(stack->phb),
-                          &pnv_phb4_xscom_ops, stack->phb, name, 0x40);
-
     if (stack->phb && !sysbus_realize(SYS_BUS_DEVICE(stack->phb), errp)) {
         return;
     }
@@ -591,10 +585,6 @@ static void pnv_pec_stk_realize(DeviceState *dev, Error **errp)
     pnv_xscom_add_subregion(chip,
                             pec_pci_base + 0x40 * (stack->stack_no + 1),
                             &stack->pci_regs_mr);
-    pnv_xscom_add_subregion(chip,
-                            pec_pci_base + PNV9_XSCOM_PEC_PCI_STK0 +
-                            0x40 * stack->stack_no,
-                            &stack->phb_regs_mr);
 }
 
 static Property pnv_pec_stk_properties[] = {
-- 
2.33.1