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(head: &b->children) && list_empty(head: &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(dev: &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(dev: &host_bridge->dev);
93
94 /* Now release the IO resource */
95 if (res->flags & IORESOURCE_IO)
96 release_resource(new: 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(new: 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(dev: &host_bridge->dev);
112
113 return 0;
114}
115EXPORT_SYMBOL_GPL(remove_phb_dynamic);
116

source code of linux/arch/powerpc/platforms/pseries/pci_dlpar.c