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 <linux/node.h>
15 #include <asm/pci-bridge.h>
16 #include <asm/ppc-pci.h>
17 #include <asm/firmware.h>
18 #include <asm/eeh.h>
19
20 #include "pseries.h"
21
init_phb_dynamic(struct device_node * dn)22 struct pci_controller *init_phb_dynamic(struct device_node *dn)
23 {
24 struct pci_controller *phb;
25 int nid;
26
27 pr_debug("PCI: Initializing new hotplug PHB %pOF\n", dn);
28
29 nid = of_node_to_nid(dn);
30 if (likely((nid) >= 0)) {
31 if (!node_online(nid)) {
32 if (__register_one_node(nid)) {
33 pr_err("PCI: Failed to register node %d\n", nid);
34 } else {
35 update_numa_distance(dn);
36 node_set_online(nid);
37 }
38 }
39 }
40
41 phb = pcibios_alloc_controller(dn);
42 if (!phb)
43 return NULL;
44 rtas_setup_phb(phb);
45 pci_process_bridge_OF_ranges(phb, dn, 0);
46 phb->controller_ops = pseries_pci_controller_ops;
47
48 pci_devs_phb_init_dynamic(phb);
49
50 pseries_msi_allocate_domains(phb);
51
52 ppc_iommu_register_device(phb);
53
54 /* Create EEH devices for the PHB */
55 eeh_phb_pe_create(phb);
56
57 if (dn->child)
58 pseries_eeh_init_edev_recursive(PCI_DN(dn));
59
60 pcibios_scan_phb(phb);
61 pcibios_finish_adding_to_bus(phb->bus);
62
63 return phb;
64 }
65 EXPORT_SYMBOL_GPL(init_phb_dynamic);
66
67 /* RPA-specific bits for removing PHBs */
remove_phb_dynamic(struct pci_controller * phb)68 int remove_phb_dynamic(struct pci_controller *phb)
69 {
70 struct pci_bus *b = phb->bus;
71 struct pci_host_bridge *host_bridge = to_pci_host_bridge(b->bridge);
72 struct resource *res;
73 int rc, i;
74
75 pr_debug("PCI: Removing PHB %04x:%02x...\n",
76 pci_domain_nr(b), b->number);
77
78 /* We cannot to remove a root bus that has children */
79 if (!(list_empty(&b->children) && list_empty(&b->devices)))
80 return -EBUSY;
81
82 /* We -know- there aren't any child devices anymore at this stage
83 * and thus, we can safely unmap the IO space as it's not in use
84 */
85 res = &phb->io_resource;
86 if (res->flags & IORESOURCE_IO) {
87 rc = pcibios_unmap_io_space(b);
88 if (rc) {
89 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
90 __func__, b->name);
91 return 1;
92 }
93 }
94
95 ppc_iommu_unregister_device(phb);
96
97 pseries_msi_free_domains(phb);
98
99 /* Keep a reference so phb isn't freed yet */
100 get_device(&host_bridge->dev);
101
102 /* Remove the PCI bus and unregister the bridge device from sysfs */
103 phb->bus = NULL;
104 pci_remove_bus(b);
105 host_bridge->bus = NULL;
106 device_unregister(&host_bridge->dev);
107
108 /* Now release the IO resource */
109 if (res->flags & IORESOURCE_IO)
110 release_resource(res);
111
112 /* Release memory resources */
113 for (i = 0; i < 3; ++i) {
114 res = &phb->mem_resources[i];
115 if (!(res->flags & IORESOURCE_MEM))
116 continue;
117 release_resource(res);
118 }
119
120 /*
121 * The pci_controller data structure is freed by
122 * the pcibios_free_controller_deferred() callback;
123 * see pseries_root_bridge_prepare().
124 */
125 put_device(&host_bridge->dev);
126
127 return 0;
128 }
129 EXPORT_SYMBOL_GPL(remove_phb_dynamic);
130