Revert "powerpc/pseries/iommu: Fix iommu initialisation during DLPAR add"

This reverts commit ed8b94f.

Gaurav reported that there are still problems with the patch and it
should be reverted pending a fuller fix.

Link: https://lore.kernel.org/all/4f6fc1ac-7a76-4447-9d0e-f55c0be373f8@linux.ibm.com/
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

Author: mpe

arch/powerpc/include/asm/ppc-pci.h

@@ -29,9 +29,6 @@ void *pci_traverse_device_nodes(struct device_node *start,
 				void *(*fn)(struct device_node *, void *),
 				void *data);
 extern void pci_devs_phb_init_dynamic(struct pci_controller *phb);
-extern void ppc_iommu_register_device(struct pci_controller *phb);
-extern void ppc_iommu_unregister_device(struct pci_controller *phb);
-
 
 /* From rtas_pci.h */
 extern void init_pci_config_tokens (void);

arch/powerpc/kernel/iommu.c

@@ -1388,21 +1388,6 @@ static const struct attribute_group *spapr_tce_iommu_groups[] = {
 	NULL,
 };
 
-void ppc_iommu_register_device(struct pci_controller *phb)
-{
-	iommu_device_sysfs_add(&phb->iommu, phb->parent,
-				spapr_tce_iommu_groups, "iommu-phb%04x",
-				phb->global_number);
-	iommu_device_register(&phb->iommu, &spapr_tce_iommu_ops,
-				phb->parent);
-}
-
-void ppc_iommu_unregister_device(struct pci_controller *phb)
-{
-	iommu_device_unregister(&phb->iommu);
-	iommu_device_sysfs_remove(&phb->iommu);
-}
-
 /*
  * This registers IOMMU devices of PHBs. This needs to happen
  * after core_initcall(iommu_init) + postcore_initcall(pci_driver_init) and
@@ -1413,7 +1398,11 @@ static int __init spapr_tce_setup_phb_iommus_initcall(void)
 	struct pci_controller *hose;
 
 	list_for_each_entry(hose, &hose_list, list_node) {
-		ppc_iommu_register_device(hose);
+		iommu_device_sysfs_add(&hose->iommu, hose->parent,
+				       spapr_tce_iommu_groups, "iommu-phb%04x",
+				       hose->global_number);
+		iommu_device_register(&hose->iommu, &spapr_tce_iommu_ops,
+				      hose->parent);
 	}
 	return 0;
 }

arch/powerpc/platforms/pseries/pci_dlpar.c

@@ -35,8 +35,6 @@ struct pci_controller *init_phb_dynamic(struct device_node *dn)
 
 	pseries_msi_allocate_domains(phb);
 
-	ppc_iommu_register_device(phb);
-
 	/* Create EEH devices for the PHB */
 	eeh_phb_pe_create(phb);
 
@@ -78,8 +76,6 @@ int remove_phb_dynamic(struct pci_controller *phb)
 		}
 	}
 
-	ppc_iommu_unregister_device(phb);
-
 	pseries_msi_free_domains(phb);
 
 	/* Keep a reference so phb isn't freed yet */