1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c" |
4 | * |
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 | * Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com> |
11 | */ |
12 | |
13 | #include <linux/pci.h> |
14 | #include <linux/export.h> |
15 | #include <linux/of.h> |
16 | #include <asm/pci-bridge.h> |
17 | #include <asm/ppc-pci.h> |
18 | #include <asm/firmware.h> |
19 | #include <asm/eeh.h> |
20 | |
21 | static struct pci_bus *find_bus_among_children(struct pci_bus *bus, |
22 | struct device_node *dn) |
23 | { |
24 | struct pci_bus *child = NULL; |
25 | struct pci_bus *tmp; |
26 | |
27 | if (pci_bus_to_OF_node(bus) == dn) |
28 | return bus; |
29 | |
30 | list_for_each_entry(tmp, &bus->children, node) { |
31 | child = find_bus_among_children(bus: tmp, dn); |
32 | if (child) |
33 | break; |
34 | } |
35 | |
36 | return child; |
37 | } |
38 | |
39 | struct pci_bus *pci_find_bus_by_node(struct device_node *dn) |
40 | { |
41 | struct pci_dn *pdn = PCI_DN(dn); |
42 | |
43 | if (!pdn || !pdn->phb || !pdn->phb->bus) |
44 | return NULL; |
45 | |
46 | return find_bus_among_children(bus: pdn->phb->bus, dn); |
47 | } |
48 | EXPORT_SYMBOL_GPL(pci_find_bus_by_node); |
49 | |
50 | /** |
51 | * pcibios_release_device - release PCI device |
52 | * @dev: PCI device |
53 | * |
54 | * The function is called before releasing the indicated PCI device. |
55 | */ |
56 | void pcibios_release_device(struct pci_dev *dev) |
57 | { |
58 | struct pci_controller *phb = pci_bus_to_host(dev->bus); |
59 | struct pci_dn *pdn = pci_get_pdn(dev); |
60 | |
61 | if (phb->controller_ops.release_device) |
62 | phb->controller_ops.release_device(dev); |
63 | |
64 | /* free()ing the pci_dn has been deferred to us, do it now */ |
65 | if (pdn && (pdn->flags & PCI_DN_FLAG_DEAD)) { |
66 | pci_dbg(dev, "freeing dead pdn\n" ); |
67 | kfree(objp: pdn); |
68 | } |
69 | } |
70 | |
71 | /** |
72 | * pci_hp_remove_devices - remove all devices under this bus |
73 | * @bus: the indicated PCI bus |
74 | * |
75 | * Remove all of the PCI devices under this bus both from the |
76 | * linux pci device tree, and from the powerpc EEH address cache. |
77 | */ |
78 | void pci_hp_remove_devices(struct pci_bus *bus) |
79 | { |
80 | struct pci_dev *dev, *tmp; |
81 | struct pci_bus *child_bus; |
82 | |
83 | /* First go down child busses */ |
84 | list_for_each_entry(child_bus, &bus->children, node) |
85 | pci_hp_remove_devices(bus: child_bus); |
86 | |
87 | pr_debug("PCI: Removing devices on bus %04x:%02x\n" , |
88 | pci_domain_nr(bus), bus->number); |
89 | list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { |
90 | pr_debug(" Removing %s...\n" , pci_name(dev)); |
91 | pci_stop_and_remove_bus_device(dev); |
92 | } |
93 | } |
94 | EXPORT_SYMBOL_GPL(pci_hp_remove_devices); |
95 | |
96 | /** |
97 | * pci_hp_add_devices - adds new pci devices to bus |
98 | * @bus: the indicated PCI bus |
99 | * |
100 | * This routine will find and fixup new pci devices under |
101 | * the indicated bus. This routine presumes that there |
102 | * might already be some devices under this bridge, so |
103 | * it carefully tries to add only new devices. (And that |
104 | * is how this routine differs from other, similar pcibios |
105 | * routines.) |
106 | */ |
107 | void pci_hp_add_devices(struct pci_bus *bus) |
108 | { |
109 | int slotno, mode, max; |
110 | struct pci_dev *dev; |
111 | struct pci_controller *phb; |
112 | struct device_node *dn = pci_bus_to_OF_node(bus); |
113 | |
114 | phb = pci_bus_to_host(bus); |
115 | |
116 | mode = PCI_PROBE_NORMAL; |
117 | if (phb->controller_ops.probe_mode) |
118 | mode = phb->controller_ops.probe_mode(bus); |
119 | |
120 | if (mode == PCI_PROBE_DEVTREE) { |
121 | /* use ofdt-based probe */ |
122 | of_rescan_bus(dn, bus); |
123 | } else if (mode == PCI_PROBE_NORMAL && |
124 | dn->child && PCI_DN(dn->child)) { |
125 | /* |
126 | * Use legacy probe. In the partial hotplug case, we |
127 | * probably have grandchildren devices unplugged. So |
128 | * we don't check the return value from pci_scan_slot() in |
129 | * order for fully rescan all the way down to pick them up. |
130 | * They can have been removed during partial hotplug. |
131 | */ |
132 | slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); |
133 | pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); |
134 | max = bus->busn_res.start; |
135 | /* |
136 | * Scan bridges that are already configured. We don't touch |
137 | * them unless they are misconfigured (which will be done in |
138 | * the second scan below). |
139 | */ |
140 | for_each_pci_bridge(dev, bus) |
141 | max = pci_scan_bridge(bus, dev, max, pass: 0); |
142 | |
143 | /* Scan bridges that need to be reconfigured */ |
144 | for_each_pci_bridge(dev, bus) |
145 | max = pci_scan_bridge(bus, dev, max, pass: 1); |
146 | } |
147 | pcibios_finish_adding_to_bus(bus); |
148 | } |
149 | EXPORT_SYMBOL_GPL(pci_hp_add_devices); |
150 | |