1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c"
*
* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
* Copyright (C) 2005 International Business Machines
*
* Updates, 2005, John Rose <johnrose@austin.ibm.com>
* Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
* Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com>
*/
#include <linux/pci.h>
#include <linux/export.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>
#include <asm/firmware.h>
#include <asm/eeh.h>
static struct pci_bus *find_bus_among_children(struct pci_bus *bus,
struct device_node *dn)
{
struct pci_bus *child = NULL;
struct pci_bus *tmp;
if (pci_bus_to_OF_node(bus) == dn)
return bus;
list_for_each_entry(tmp, &bus->children, node) {
child = find_bus_among_children(tmp, dn);
if (child)
break;
}
return child;
}
struct pci_bus *pci_find_bus_by_node(struct device_node *dn)
{
struct pci_dn *pdn = PCI_DN(dn);
if (!pdn || !pdn->phb || !pdn->phb->bus)
return NULL;
return find_bus_among_children(pdn->phb->bus, dn);
}
EXPORT_SYMBOL_GPL(pci_find_bus_by_node);
/**
* pcibios_release_device - release PCI device
* @dev: PCI device
*
* The function is called before releasing the indicated PCI device.
*/
void pcibios_release_device(struct pci_dev *dev)
{
struct pci_controller *phb = pci_bus_to_host(dev->bus);
eeh_remove_device(dev);
if (phb->controller_ops.release_device)
phb->controller_ops.release_device(dev);
}
/**
* pci_hp_remove_devices - remove all devices under this bus
* @bus: the indicated PCI bus
*
* Remove all of the PCI devices under this bus both from the
* linux pci device tree, and from the powerpc EEH address cache.
*/
void pci_hp_remove_devices(struct pci_bus *bus)
{
struct pci_dev *dev, *tmp;
struct pci_bus *child_bus;
/* First go down child busses */
list_for_each_entry(child_bus, &bus->children, node)
pci_hp_remove_devices(child_bus);
pr_debug("PCI: Removing devices on bus %04x:%02x\n",
pci_domain_nr(bus), bus->number);
list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
pr_debug(" Removing %s...\n", pci_name(dev));
pci_stop_and_remove_bus_device(dev);
}
}
EXPORT_SYMBOL_GPL(pci_hp_remove_devices);
/**
* pci_hp_add_devices - adds new pci devices to bus
* @bus: the indicated PCI bus
*
* This routine will find and fixup new pci devices under
* the indicated bus. This routine presumes that there
* might already be some devices under this bridge, so
* it carefully tries to add only new devices. (And that
* is how this routine differs from other, similar pcibios
* routines.)
*/
void pci_hp_add_devices(struct pci_bus *bus)
{
int slotno, mode, max;
struct pci_dev *dev;
struct pci_controller *phb;
struct device_node *dn = pci_bus_to_OF_node(bus);
eeh_add_device_tree_early(PCI_DN(dn));
phb = pci_bus_to_host(bus);
mode = PCI_PROBE_NORMAL;
if (phb->controller_ops.probe_mode)
mode = phb->controller_ops.probe_mode(bus);
if (mode == PCI_PROBE_DEVTREE) {
/* use ofdt-based probe */
of_rescan_bus(dn, bus);
} else if (mode == PCI_PROBE_NORMAL &&
dn->child && PCI_DN(dn->child)) {
/*
* Use legacy probe. In the partial hotplug case, we
* probably have grandchildren devices unplugged. So
* we don't check the return value from pci_scan_slot() in
* order for fully rescan all the way down to pick them up.
* They can have been removed during partial hotplug.
*/
slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
pcibios_setup_bus_devices(bus);
max = bus->busn_res.start;
/*
* Scan bridges that are already configured. We don't touch
* them unless they are misconfigured (which will be done in
* the second scan below).
*/
for_each_pci_bridge(dev, bus)
max = pci_scan_bridge(bus, dev, max, 0);
/* Scan bridges that need to be reconfigured */
for_each_pci_bridge(dev, bus)
max = pci_scan_bridge(bus, dev, max, 1);
}
pcibios_finish_adding_to_bus(bus);
}
EXPORT_SYMBOL_GPL(pci_hp_add_devices);
|
