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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - arch/powerpc/kernel/pci-hotplug.c
2 * Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c"
4 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
5 * Copyright (C) 2005 International Business Machines
7 * Updates, 2005, John Rose <johnrose@austin.ibm.com>
8 * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
9 * Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
17 #include <linux/pci.h>
18 #include <linux/export.h>
19 #include <asm/pci-bridge.h>
20 #include <asm/ppc-pci.h>
21 #include <asm/firmware.h>
24 static struct pci_bus
*find_bus_among_children(struct pci_bus
*bus
,
25 struct device_node
*dn
)
27 struct pci_bus
*child
= NULL
;
30 if (pci_bus_to_OF_node(bus
) == dn
)
33 list_for_each_entry(tmp
, &bus
->children
, node
) {
34 child
= find_bus_among_children(tmp
, dn
);
42 struct pci_bus
*pci_find_bus_by_node(struct device_node
*dn
)
44 struct pci_dn
*pdn
= PCI_DN(dn
);
46 if (!pdn
|| !pdn
->phb
|| !pdn
->phb
->bus
)
49 return find_bus_among_children(pdn
->phb
->bus
, dn
);
51 EXPORT_SYMBOL_GPL(pci_find_bus_by_node
);
54 * pcibios_release_device - release PCI device
57 * The function is called before releasing the indicated PCI device.
59 void pcibios_release_device(struct pci_dev
*dev
)
61 struct pci_controller
*phb
= pci_bus_to_host(dev
->bus
);
63 eeh_remove_device(dev
);
65 if (phb
->controller_ops
.release_device
)
66 phb
->controller_ops
.release_device(dev
);
70 * pci_hp_remove_devices - remove all devices under this bus
71 * @bus: the indicated PCI bus
73 * Remove all of the PCI devices under this bus both from the
74 * linux pci device tree, and from the powerpc EEH address cache.
76 void pci_hp_remove_devices(struct pci_bus
*bus
)
78 struct pci_dev
*dev
, *tmp
;
79 struct pci_bus
*child_bus
;
81 /* First go down child busses */
82 list_for_each_entry(child_bus
, &bus
->children
, node
)
83 pci_hp_remove_devices(child_bus
);
85 pr_debug("PCI: Removing devices on bus %04x:%02x\n",
86 pci_domain_nr(bus
), bus
->number
);
87 list_for_each_entry_safe_reverse(dev
, tmp
, &bus
->devices
, bus_list
) {
88 pr_debug(" Removing %s...\n", pci_name(dev
));
89 pci_stop_and_remove_bus_device(dev
);
92 EXPORT_SYMBOL_GPL(pci_hp_remove_devices
);
95 * pci_hp_add_devices - adds new pci devices to bus
96 * @bus: the indicated PCI bus
98 * This routine will find and fixup new pci devices under
99 * the indicated bus. This routine presumes that there
100 * might already be some devices under this bridge, so
101 * it carefully tries to add only new devices. (And that
102 * is how this routine differs from other, similar pcibios
105 void pci_hp_add_devices(struct pci_bus
*bus
)
107 int slotno
, mode
, max
;
109 struct pci_controller
*phb
;
110 struct device_node
*dn
= pci_bus_to_OF_node(bus
);
112 eeh_add_device_tree_early(PCI_DN(dn
));
114 phb
= pci_bus_to_host(bus
);
116 mode
= PCI_PROBE_NORMAL
;
117 if (phb
->controller_ops
.probe_mode
)
118 mode
= phb
->controller_ops
.probe_mode(bus
);
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
)) {
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.
132 slotno
= PCI_SLOT(PCI_DN(dn
->child
)->devfn
);
133 pci_scan_slot(bus
, PCI_DEVFN(slotno
, 0));
134 pcibios_setup_bus_devices(bus
);
135 max
= bus
->busn_res
.start
;
137 * Scan bridges that are already configured. We don't touch
138 * them unless they are misconfigured (which will be done in
139 * the second scan below).
141 for_each_pci_bridge(dev
, bus
)
142 max
= pci_scan_bridge(bus
, dev
, max
, 0);
144 /* Scan bridges that need to be reconfigured */
145 for_each_pci_bridge(dev
, bus
)
146 max
= pci_scan_bridge(bus
, dev
, max
, 1);
148 pcibios_finish_adding_to_bus(bus
);
150 EXPORT_SYMBOL_GPL(pci_hp_add_devices
);