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tjh.dev
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linux
1/*
2 * The file intends to implement dynamic creation of EEH device, which will
3 * be bound with OF node and PCI device simutaneously. The EEH devices would
4 * be foundamental information for EEH core components to work proerly. Besides,
5 * We have to support multiple situations where dynamic creation of EEH device
6 * is required:
7 *
8 * 1) Before PCI emunation starts, we need create EEH devices according to the
9 * PCI sensitive OF nodes.
10 * 2) When PCI emunation is done, we need do the binding between PCI device and
11 * the associated EEH device.
12 * 3) DR (Dynamic Reconfiguration) would create PCI sensitive OF node. EEH device
13 * will be created while PCI sensitive OF node is detected from DR.
14 * 4) PCI hotplug needs redoing the binding between PCI device and EEH device. If
15 * PHB is newly inserted, we also need create EEH devices accordingly.
16 *
17 * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2012.
18 *
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 */
33
34#include <linux/export.h>
35#include <linux/gfp.h>
36#include <linux/init.h>
37#include <linux/kernel.h>
38#include <linux/pci.h>
39#include <linux/string.h>
40
41#include <asm/pci-bridge.h>
42#include <asm/ppc-pci.h>
43
44/**
45 * eeh_dev_init - Create EEH device according to OF node
46 * @dn: device node
47 * @data: PHB
48 *
49 * It will create EEH device according to the given OF node. The function
50 * might be called by PCI emunation, DR, PHB hotplug.
51 */
52void *eeh_dev_init(struct device_node *dn, void *data)
53{
54 struct pci_controller *phb = data;
55 struct eeh_dev *edev;
56
57 /* Allocate EEH device */
58 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
59 if (!edev) {
60 pr_warning("%s: out of memory\n", __func__);
61 return NULL;
62 }
63
64 /* Associate EEH device with OF node */
65 PCI_DN(dn)->edev = edev;
66 edev->dn = dn;
67 edev->phb = phb;
68 INIT_LIST_HEAD(&edev->list);
69
70 return NULL;
71}
72
73/**
74 * eeh_dev_phb_init_dynamic - Create EEH devices for devices included in PHB
75 * @phb: PHB
76 *
77 * Scan the PHB OF node and its child association, then create the
78 * EEH devices accordingly
79 */
80void eeh_dev_phb_init_dynamic(struct pci_controller *phb)
81{
82 struct device_node *dn = phb->dn;
83
84 /* EEH PE for PHB */
85 eeh_phb_pe_create(phb);
86
87 /* EEH device for PHB */
88 eeh_dev_init(dn, phb);
89
90 /* EEH devices for children OF nodes */
91 traverse_pci_devices(dn, eeh_dev_init, phb);
92}
93
94/**
95 * eeh_dev_phb_init - Create EEH devices for devices included in existing PHBs
96 *
97 * Scan all the existing PHBs and create EEH devices for their OF
98 * nodes and their children OF nodes
99 */
100static int __init eeh_dev_phb_init(void)
101{
102 struct pci_controller *phb, *tmp;
103
104 list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
105 eeh_dev_phb_init_dynamic(phb);
106
107 pr_info("EEH: devices created\n");
108
109 return 0;
110}
111
112core_initcall(eeh_dev_phb_init);