pci_dlpar.c

  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 <linux/node.h>
 15#include <asm/pci-bridge.h>
 16#include <asm/ppc-pci.h>
 17#include <asm/firmware.h>
 18#include <asm/eeh.h>
 19
 20#include "pseries.h"
 21
 22struct pci_controller *init_phb_dynamic(struct device_node *dn)
 23{
 24	struct pci_controller *phb;
 25	int nid;
 26
 27	pr_debug("PCI: Initializing new hotplug PHB %pOF\n", dn);
 28
 29	nid = of_node_to_nid(dn);
 30	if (likely((nid) >= 0)) {
 31		if (!node_online(nid)) {
 32			if (register_node(nid)) {
 33				pr_err("PCI: Failed to register node %d\n", nid);
 34			} else {
 35				update_numa_distance(dn);
 36				node_set_online(nid);
 37			}
 38		}
 39	}
 40
 41	phb = pcibios_alloc_controller(dn);
 42	if (!phb)
 43		return NULL;
 44	rtas_setup_phb(phb);
 45	pci_process_bridge_OF_ranges(phb, dn, 0);
 46	phb->controller_ops = pseries_pci_controller_ops;
 47
 48	pci_devs_phb_init_dynamic(phb);
 49
 50	pseries_msi_allocate_domains(phb);
 51
 52	ppc_iommu_register_device(phb);
 53
 54	/* Create EEH devices for the PHB */
 55	eeh_phb_pe_create(phb);
 56
 57	if (dn->child)
 58		pseries_eeh_init_edev_recursive(PCI_DN(dn));
 59
 60	pcibios_scan_phb(phb);
 61	pcibios_finish_adding_to_bus(phb->bus);
 62
 63	return phb;
 64}
 65EXPORT_SYMBOL_GPL(init_phb_dynamic);
 66
 67/* RPA-specific bits for removing PHBs */
 68int remove_phb_dynamic(struct pci_controller *phb)
 69{
 70	struct pci_bus *b = phb->bus;
 71	struct pci_host_bridge *host_bridge = to_pci_host_bridge(b->bridge);
 72	struct resource *res;
 73	int rc, i;
 74
 75	pr_debug("PCI: Removing PHB %04x:%02x...\n",
 76		 pci_domain_nr(b), b->number);
 77
 78	/* We cannot to remove a root bus that has children */
 79	if (!(list_empty(&b->children) && list_empty(&b->devices)))
 80		return -EBUSY;
 81
 82	/* We -know- there aren't any child devices anymore at this stage
 83	 * and thus, we can safely unmap the IO space as it's not in use
 84	 */
 85	res = &phb->io_resource;
 86	if (res->flags & IORESOURCE_IO) {
 87		rc = pcibios_unmap_io_space(b);
 88		if (rc) {
 89			printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
 90			       __func__, b->name);
 91			return 1;
 92		}
 93	}
 94
 95	ppc_iommu_unregister_device(phb);
 96
 97	pseries_msi_free_domains(phb);
 98
 99	/* Keep a reference so phb isn't freed yet */
100	get_device(&host_bridge->dev);
101
102	/* Remove the PCI bus and unregister the bridge device from sysfs */
103	phb->bus = NULL;
104	pci_remove_bus(b);
105	host_bridge->bus = NULL;
106	device_unregister(&host_bridge->dev);
107
108	/* Now release the IO resource */
109	if (res->flags & IORESOURCE_IO)
110		release_resource(res);
111
112	/* Release memory resources */
113	for (i = 0; i < 3; ++i) {
114		res = &phb->mem_resources[i];
115		if (!(res->flags & IORESOURCE_MEM))
116			continue;
117		release_resource(res);
118	}
119
120	/*
121	 * The pci_controller data structure is freed by
122	 * the pcibios_free_controller_deferred() callback;
123	 * see pseries_root_bridge_prepare().
124	 */
125	put_device(&host_bridge->dev);
126
127	return 0;
128}
129EXPORT_SYMBOL_GPL(remove_phb_dynamic);