1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
  4 * for RPA-compliant PPC64 platform.
  5 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
  6 * Copyright (C) 2005 International Business Machines
  7 *
  8 * Updates, 2005, John Rose <johnrose@austin.ibm.com>
  9 * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
 10 */
 11
 12#include <linux/pci.h>
 13#include <linux/export.h>
 14#include <asm/pci-bridge.h>
 15#include <asm/ppc-pci.h>
 16#include <asm/firmware.h>
 17#include <asm/eeh.h>
 18
 19#include "pseries.h"
 20
 21struct pci_controller *init_phb_dynamic(struct device_node *dn)
 22{
 23	struct pci_controller *phb;
 24
 25	pr_debug("PCI: Initializing new hotplug PHB %pOF\n", dn);
 26
 27	phb = pcibios_alloc_controller(dn);
 28	if (!phb)
 29		return NULL;
 30	rtas_setup_phb(phb);
 31	pci_process_bridge_OF_ranges(phb, dn, 0);
 32	phb->controller_ops = pseries_pci_controller_ops;
 33
 34	pci_devs_phb_init_dynamic(phb);
 35
 36	pseries_msi_allocate_domains(phb);
 37
 38	ppc_iommu_register_device(phb);
 39
 40	/* Create EEH devices for the PHB */
 41	eeh_phb_pe_create(phb);
 42
 43	if (dn->child)
 44		pseries_eeh_init_edev_recursive(PCI_DN(dn));
 45
 46	pcibios_scan_phb(phb);
 47	pcibios_finish_adding_to_bus(phb->bus);
 48
 49	return phb;
 50}
 51EXPORT_SYMBOL_GPL(init_phb_dynamic);
 52
 53/* RPA-specific bits for removing PHBs */
 54int remove_phb_dynamic(struct pci_controller *phb)
 55{
 56	struct pci_bus *b = phb->bus;
 57	struct pci_host_bridge *host_bridge = to_pci_host_bridge(b->bridge);
 58	struct resource *res;
 59	int rc, i;
 60
 61	pr_debug("PCI: Removing PHB %04x:%02x...\n",
 62		 pci_domain_nr(b), b->number);
 63
 64	/* We cannot to remove a root bus that has children */
 65	if (!(list_empty(&b->children) && list_empty(&b->devices)))
 66		return -EBUSY;
 67
 68	/* We -know- there aren't any child devices anymore at this stage
 69	 * and thus, we can safely unmap the IO space as it's not in use
 70	 */
 71	res = &phb->io_resource;
 72	if (res->flags & IORESOURCE_IO) {
 73		rc = pcibios_unmap_io_space(b);
 74		if (rc) {
 75			printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
 76			       __func__, b->name);
 77			return 1;
 78		}
 79	}
 80
 81	ppc_iommu_unregister_device(phb);
 82
 83	pseries_msi_free_domains(phb);
 84
 85	/* Keep a reference so phb isn't freed yet */
 86	get_device(&host_bridge->dev);
 87
 88	/* Remove the PCI bus and unregister the bridge device from sysfs */
 89	phb->bus = NULL;
 90	pci_remove_bus(b);
 91	host_bridge->bus = NULL;
 92	device_unregister(&host_bridge->dev);
 93
 94	/* Now release the IO resource */
 95	if (res->flags & IORESOURCE_IO)
 96		release_resource(res);
 97
 98	/* Release memory resources */
 99	for (i = 0; i < 3; ++i) {
100		res = &phb->mem_resources[i];
101		if (!(res->flags & IORESOURCE_MEM))
102			continue;
103		release_resource(res);
104	}
105
106	/*
107	 * The pci_controller data structure is freed by
108	 * the pcibios_free_controller_deferred() callback;
109	 * see pseries_root_bridge_prepare().
110	 */
111	put_device(&host_bridge->dev);
112
113	return 0;
114}
115EXPORT_SYMBOL_GPL(remove_phb_dynamic);