powerpc/powernv: Move pnv_ioda_setup_bus_dma under CONFIG_IOMMU_API

pnv_ioda_setup_bus_dma() is only used when a passed through PE is
returned to the host. If the kernel is built without IOMMU support
this is dead code. Move it under the #ifdef with the rest of the
IOMMU API support.

Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Oliver O'Halloran <[e-mail]>
Reviewed-by: Alexey Kardashevskiy <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/powerpc/platforms/powernv/pci-ioda.c

···
 	return false;
 }
 
-static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, struct pci_bus *bus)
-{
-	struct pci_dev *dev;
-
-	list_for_each_entry(dev, &bus->devices, bus_list) {
-		set_iommu_table_base(&dev->dev, pe->table_group.tables[0]);
-		dev->dev.archdata.dma_offset = pe->tce_bypass_base;
-
-		if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
-			pnv_ioda_setup_bus_dma(pe, dev->subordinate);
-	}
-}
-
 static inline __be64 __iomem *pnv_ioda_get_inval_reg(struct pnv_phb *phb,
 						     bool real_mode)
 {
···
 		(*ptbl)->it_allocated_size = pnv_pci_ioda2_get_table_size(
 				page_shift, window_size, levels);
 	return ret;
+}
+
+static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, struct pci_bus *bus)
+{
+	struct pci_dev *dev;
+
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		set_iommu_table_base(&dev->dev, pe->table_group.tables[0]);
+		dev->dev.archdata.dma_offset = pe->tce_bypass_base;
+
+		if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
+			pnv_ioda_setup_bus_dma(pe, dev->subordinate);
+	}
 }
 
 static void pnv_ioda2_take_ownership(struct iommu_table_group *table_group)