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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
* for RPA-compliant PPC64 platform.
* 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>
*/
#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>
#include "pseries.h"
struct pci_controller *init_phb_dynamic(struct device_node *dn)
{
struct pci_controller *phb;
pr_debug("PCI: Initializing new hotplug PHB %pOF\n", dn);
phb = pcibios_alloc_controller(dn);
if (!phb)
return NULL;
rtas_setup_phb(phb);
pci_process_bridge_OF_ranges(phb, dn, 0);
phb->controller_ops = pseries_pci_controller_ops;
pci_devs_phb_init_dynamic(phb);
pseries_msi_allocate_domains(phb);
ppc_iommu_register_device(phb);
/* Create EEH devices for the PHB */
eeh_phb_pe_create(phb);
if (dn->child)
pseries_eeh_init_edev_recursive(PCI_DN(dn));
pcibios_scan_phb(phb);
pcibios_finish_adding_to_bus(phb->bus);
return phb;
}
EXPORT_SYMBOL_GPL(init_phb_dynamic);
/* RPA-specific bits for removing PHBs */
int remove_phb_dynamic(struct pci_controller *phb)
{
struct pci_bus *b = phb->bus;
struct pci_host_bridge *host_bridge = to_pci_host_bridge(b->bridge);
struct resource *res;
int rc, i;
pr_debug("PCI: Removing PHB %04x:%02x...\n",
pci_domain_nr(b), b->number);
/* We cannot to remove a root bus that has children */
if (!(list_empty(&b->children) && list_empty(&b->devices)))
return -EBUSY;
/* We -know- there aren't any child devices anymore at this stage
* and thus, we can safely unmap the IO space as it's not in use
*/
res = &phb->io_resource;
if (res->flags & IORESOURCE_IO) {
rc = pcibios_unmap_io_space(b);
if (rc) {
printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
__func__, b->name);
return 1;
}
}
ppc_iommu_unregister_device(phb);
pseries_msi_free_domains(phb);
/* Keep a reference so phb isn't freed yet */
get_device(&host_bridge->dev);
/* Remove the PCI bus and unregister the bridge device from sysfs */
phb->bus = NULL;
pci_remove_bus(b);
host_bridge->bus = NULL;
device_unregister(&host_bridge->dev);
/* Now release the IO resource */
if (res->flags & IORESOURCE_IO)
release_resource(res);
/* Release memory resources */
for (i = 0; i < 3; ++i) {
res = &phb->mem_resources[i];
if (!(res->flags & IORESOURCE_MEM))
continue;
release_resource(res);
}
/*
* The pci_controller data structure is freed by
* the pcibios_free_controller_deferred() callback;
* see pseries_root_bridge_prepare().
*/
put_device(&host_bridge->dev);
return 0;
}
EXPORT_SYMBOL_GPL(remove_phb_dynamic);
|
