Commit | Line | Data |
---|---|---|
eb740b5f GS |
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 | |
e8e9b34c | 46 | * @pdn: PCI device node |
eb740b5f GS |
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 | */ | |
e8e9b34c | 52 | void *eeh_dev_init(struct pci_dn *pdn, void *data) |
eb740b5f GS |
53 | { |
54 | struct pci_controller *phb = data; | |
55 | struct eeh_dev *edev; | |
56 | ||
57 | /* Allocate EEH device */ | |
7e4bbaf0 | 58 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
eb740b5f | 59 | if (!edev) { |
0dae2743 GS |
60 | pr_warn("%s: out of memory\n", |
61 | __func__); | |
eb740b5f GS |
62 | return NULL; |
63 | } | |
64 | ||
65 | /* Associate EEH device with OF node */ | |
e8e9b34c GS |
66 | pdn->edev = edev; |
67 | edev->pdn = pdn; | |
eb740b5f | 68 | edev->phb = phb; |
55037d17 | 69 | INIT_LIST_HEAD(&edev->list); |
67086e32 | 70 | INIT_LIST_HEAD(&edev->rmv_list); |
eb740b5f GS |
71 | |
72 | return NULL; | |
73 | } | |
74 | ||
75 | /** | |
76 | * eeh_dev_phb_init_dynamic - Create EEH devices for devices included in PHB | |
77 | * @phb: PHB | |
78 | * | |
79 | * Scan the PHB OF node and its child association, then create the | |
80 | * EEH devices accordingly | |
81 | */ | |
cad5cef6 | 82 | void eeh_dev_phb_init_dynamic(struct pci_controller *phb) |
eb740b5f | 83 | { |
e8e9b34c | 84 | struct pci_dn *root = phb->pci_data; |
eb740b5f | 85 | |
55037d17 GS |
86 | /* EEH PE for PHB */ |
87 | eeh_phb_pe_create(phb); | |
88 | ||
eb740b5f | 89 | /* EEH device for PHB */ |
e8e9b34c | 90 | eeh_dev_init(root, phb); |
eb740b5f GS |
91 | |
92 | /* EEH devices for children OF nodes */ | |
e8e9b34c | 93 | traverse_pci_dn(root, eeh_dev_init, phb); |
eb740b5f GS |
94 | } |
95 | ||
96 | /** | |
97 | * eeh_dev_phb_init - Create EEH devices for devices included in existing PHBs | |
98 | * | |
99 | * Scan all the existing PHBs and create EEH devices for their OF | |
100 | * nodes and their children OF nodes | |
101 | */ | |
35e5cfe2 | 102 | static int __init eeh_dev_phb_init(void) |
eb740b5f GS |
103 | { |
104 | struct pci_controller *phb, *tmp; | |
105 | ||
106 | list_for_each_entry_safe(phb, tmp, &hose_list, list_node) | |
107 | eeh_dev_phb_init_dynamic(phb); | |
35e5cfe2 | 108 | |
3ea1ae98 GS |
109 | pr_info("EEH: devices created\n"); |
110 | ||
35e5cfe2 | 111 | return 0; |
eb740b5f | 112 | } |
35e5cfe2 GS |
113 | |
114 | core_initcall(eeh_dev_phb_init); |