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
init_phb_dynamic(struct device_node * dn)21 struct 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 /* Create EEH devices for the PHB */
39 eeh_phb_pe_create(phb);
40
41 if (dn->child)
42 pseries_eeh_init_edev_recursive(PCI_DN(dn));
43
44 pcibios_scan_phb(phb);
45 pcibios_finish_adding_to_bus(phb->bus);
46
47 return phb;
48 }
49 EXPORT_SYMBOL_GPL(init_phb_dynamic);
50
51 /* RPA-specific bits for removing PHBs */
remove_phb_dynamic(struct pci_controller * phb)52 int remove_phb_dynamic(struct pci_controller *phb)
53 {
54 struct pci_bus *b = phb->bus;
55 struct pci_host_bridge *host_bridge = to_pci_host_bridge(b->bridge);
56 struct resource *res;
57 int rc, i;
58
59 pr_debug("PCI: Removing PHB %04x:%02x...\n",
60 pci_domain_nr(b), b->number);
61
62 /* We cannot to remove a root bus that has children */
63 if (!(list_empty(&b->children) && list_empty(&b->devices)))
64 return -EBUSY;
65
66 /* We -know- there aren't any child devices anymore at this stage
67 * and thus, we can safely unmap the IO space as it's not in use
68 */
69 res = &phb->io_resource;
70 if (res->flags & IORESOURCE_IO) {
71 rc = pcibios_unmap_io_space(b);
72 if (rc) {
73 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
74 __func__, b->name);
75 return 1;
76 }
77 }
78
79 pseries_msi_free_domains(phb);
80
81 /* Keep a reference so phb isn't freed yet */
82 get_device(&host_bridge->dev);
83
84 /* Remove the PCI bus and unregister the bridge device from sysfs */
85 phb->bus = NULL;
86 pci_remove_bus(b);
87 host_bridge->bus = NULL;
88 device_unregister(&host_bridge->dev);
89
90 /* Now release the IO resource */
91 if (res->flags & IORESOURCE_IO)
92 release_resource(res);
93
94 /* Release memory resources */
95 for (i = 0; i < 3; ++i) {
96 res = &phb->mem_resources[i];
97 if (!(res->flags & IORESOURCE_MEM))
98 continue;
99 release_resource(res);
100 }
101
102 /*
103 * The pci_controller data structure is freed by
104 * the pcibios_free_controller_deferred() callback;
105 * see pseries_root_bridge_prepare().
106 */
107 put_device(&host_bridge->dev);
108
109 return 0;
110 }
111 EXPORT_SYMBOL_GPL(remove_phb_dynamic);
112