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 /* Create EEH devices for the PHB */
37 eeh_phb_pe_create(phb);
38
39 if (dn->child)
40 pseries_eeh_init_edev_recursive(PCI_DN(dn));
41
42 pcibios_scan_phb(phb);
43 pcibios_finish_adding_to_bus(phb->bus);
44
45 return phb;
46 }
47 EXPORT_SYMBOL_GPL(init_phb_dynamic);
48
49 /* RPA-specific bits for removing PHBs */
remove_phb_dynamic(struct pci_controller * phb)50 int remove_phb_dynamic(struct pci_controller *phb)
51 {
52 struct pci_bus *b = phb->bus;
53 struct pci_host_bridge *host_bridge = to_pci_host_bridge(b->bridge);
54 struct resource *res;
55 int rc, i;
56
57 pr_debug("PCI: Removing PHB %04x:%02x...\n",
58 pci_domain_nr(b), b->number);
59
60 /* We cannot to remove a root bus that has children */
61 if (!(list_empty(&b->children) && list_empty(&b->devices)))
62 return -EBUSY;
63
64 /* We -know- there aren't any child devices anymore at this stage
65 * and thus, we can safely unmap the IO space as it's not in use
66 */
67 res = &phb->io_resource;
68 if (res->flags & IORESOURCE_IO) {
69 rc = pcibios_unmap_io_space(b);
70 if (rc) {
71 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
72 __func__, b->name);
73 return 1;
74 }
75 }
76
77 /* Remove the PCI bus and unregister the bridge device from sysfs */
78 phb->bus = NULL;
79 pci_remove_bus(b);
80 host_bridge->bus = NULL;
81 device_unregister(&host_bridge->dev);
82
83 /* Now release the IO resource */
84 if (res->flags & IORESOURCE_IO)
85 release_resource(res);
86
87 /* Release memory resources */
88 for (i = 0; i < 3; ++i) {
89 res = &phb->mem_resources[i];
90 if (!(res->flags & IORESOURCE_MEM))
91 continue;
92 release_resource(res);
93 }
94
95 /*
96 * The pci_controller data structure is freed by
97 * the pcibios_free_controller_deferred() callback;
98 * see pseries_root_bridge_prepare().
99 */
100
101 return 0;
102 }
103 EXPORT_SYMBOL_GPL(remove_phb_dynamic);
104