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