summaryrefslogtreecommitdiffstats
path: root/kernel/arch/powerpc/platforms/pseries/pci_dlpar.c
blob: 5d4a3df59d0c95fedaa7c2235bb7dbc034d7d9f6 (plain)
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
/*
 * 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>
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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"

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;
	struct device_node *busdn;

	busdn = pci_bus_to_OF_node(bus);
	if (busdn == 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 *
pcibios_find_pci_bus(struct device_node *dn)
{
	struct pci_dn *pdn = dn->data;

	if (!pdn  || !pdn->phb || !pdn->phb->bus)
		return NULL;

	return find_bus_among_children(pdn->phb->bus, dn);
}
EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);

struct pci_controller *init_phb_dynamic(struct device_node *dn)
{
	struct pci_controller *phb;

	pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name);

	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);

	/* Create EEH devices for the PHB */
	eeh_dev_phb_init_dynamic(phb);

	if (dn->child)
		eeh_add_device_tree_early(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 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;
		}
	}

	/* Remove the PCI bus and unregister the bridge device from sysfs */
	phb->bus = NULL;
	pci_remove_bus(b);
	device_unregister(b->bridge);

	/* 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);
	}

	/* Free pci_controller data structure */
	pcibios_free_controller(phb);

	return 0;
}
EXPORT_SYMBOL_GPL(remove_phb_dynamic);