[PATCH v2 16/18] pnv_phb4.c: introduce pnv_pec_init_stack_xscom()

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

The XSCOM address space of the stack must be populated after the
initialization of its associated PHB4 is completed. At this moment this
is always true because stk_realize() will always succeeds the realize of
stack->phb, but that will not be the case with user creatable pnv-phb4
devices.

Create a helper that can be used later on during pnv-phb4 realize() to
initialize the xscom address space of its stack.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/pci-host/pnv_phb4.c         | 26 ++++++++++++++++++++++++++
 hw/pci-host/pnv_phb4_pec.c     | 19 +------------------
 include/hw/pci-host/pnv_phb4.h |  1 +
 3 files changed, 28 insertions(+), 18 deletions(-)

diff --git a/hw/pci-host/pnv_phb4.c b/hw/pci-host/pnv_phb4.c
index 9e670e41d2..430a5c10f4 100644
--- a/hw/pci-host/pnv_phb4.c
+++ b/hw/pci-host/pnv_phb4.c
@@ -1158,6 +1158,32 @@ static AddressSpace *pnv_phb4_dma_iommu(PCIBus *bus, void *opaque, int devfn)
     return &ds->dma_as;
 }
 
+/*
+ * Init the xscom address space of the stack. This must be
+ * called after the associated stack->phb is defined.
+ */
+void pnv_pec_init_stack_xscom(PnvPhb4PecStack *stack)
+{
+    PnvPhb4PecState *pec = stack->pec;
+    PnvPhb4PecClass *pecc = PNV_PHB4_PEC_GET_CLASS(pec);
+    PnvChip *chip = pec->chip;
+    uint32_t pec_nest_base = pecc->xscom_nest_base(pec);
+    uint32_t pec_pci_base = pecc->xscom_pci_base(pec);
+
+
+    /* Populate the XSCOM address space. */
+    pnv_xscom_add_subregion(chip,
+                            pec_nest_base + 0x40 * (stack->stack_no + 1),
+                            &stack->nest_regs_mr);
+    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);
+}
+
 /*
  * Return the index/phb-id of a PHB4 that belongs to a
  * pec->stacks[stack_index] stack.
diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
index 638691783b..41c79d24c4 100644
--- a/hw/pci-host/pnv_phb4_pec.c
+++ b/hw/pci-host/pnv_phb4_pec.c
@@ -556,10 +556,6 @@ static void pnv_pec_stk_realize(DeviceState *dev, Error **errp)
 {
     PnvPhb4PecStack *stack = PNV_PHB4_PEC_STACK(dev);
     PnvPhb4PecState *pec = stack->pec;
-    PnvPhb4PecClass *pecc = PNV_PHB4_PEC_GET_CLASS(pec);
-    PnvChip *chip = pec->chip;
-    uint32_t pec_nest_base;
-    uint32_t pec_pci_base;
     char name[64];
 
     assert(pec);
@@ -583,20 +579,7 @@ static void pnv_pec_stk_realize(DeviceState *dev, Error **errp)
         return;
     }
 
-    pec_nest_base = pecc->xscom_nest_base(pec);
-    pec_pci_base = pecc->xscom_pci_base(pec);
-
-    /* Populate the XSCOM address space. */
-    pnv_xscom_add_subregion(chip,
-                            pec_nest_base + 0x40 * (stack->stack_no + 1),
-                            &stack->nest_regs_mr);
-    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);
+    pnv_pec_init_stack_xscom(stack);
 }
 
 static Property pnv_pec_stk_properties[] = {
diff --git a/include/hw/pci-host/pnv_phb4.h b/include/hw/pci-host/pnv_phb4.h
index 2fb5e119c4..610580a88f 100644
--- a/include/hw/pci-host/pnv_phb4.h
+++ b/include/hw/pci-host/pnv_phb4.h
@@ -132,6 +132,7 @@ struct PnvPHB4 {
 
 void pnv_phb4_pic_print_info(PnvPHB4 *phb, Monitor *mon);
 void pnv_phb4_update_regions(PnvPhb4PecStack *stack);
+void pnv_pec_init_stack_xscom(PnvPhb4PecStack *stack);
 void pnv_phb4_set_stack_phb_props(PnvPhb4PecStack *stack, PnvPHB4 *phb);
 int pnv_phb4_pec_get_phb_id(PnvPhb4PecState *pec, int stack_index);
 extern const MemoryRegionOps pnv_phb4_xscom_ops;
-- 
2.33.1