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);
116