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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 | |
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 | */ | |
52 | void * __devinit 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 = zalloc_maybe_bootmem(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 */ | |
2a0352fa | 65 | PCI_DN(dn)->edev = edev; |
eb740b5f GS |
66 | edev->dn = dn; |
67 | edev->phb = phb; | |
68 | ||
69 | return NULL; | |
70 | } | |
71 | ||
72 | /** | |
73 | * eeh_dev_phb_init_dynamic - Create EEH devices for devices included in PHB | |
74 | * @phb: PHB | |
75 | * | |
76 | * Scan the PHB OF node and its child association, then create the | |
77 | * EEH devices accordingly | |
78 | */ | |
79 | void __devinit eeh_dev_phb_init_dynamic(struct pci_controller *phb) | |
80 | { | |
81 | struct device_node *dn = phb->dn; | |
82 | ||
83 | /* EEH device for PHB */ | |
84 | eeh_dev_init(dn, phb); | |
85 | ||
86 | /* EEH devices for children OF nodes */ | |
87 | traverse_pci_devices(dn, eeh_dev_init, phb); | |
88 | } | |
89 | ||
90 | /** | |
91 | * eeh_dev_phb_init - Create EEH devices for devices included in existing PHBs | |
92 | * | |
93 | * Scan all the existing PHBs and create EEH devices for their OF | |
94 | * nodes and their children OF nodes | |
95 | */ | |
35e5cfe2 | 96 | static int __init eeh_dev_phb_init(void) |
eb740b5f GS |
97 | { |
98 | struct pci_controller *phb, *tmp; | |
99 | ||
100 | list_for_each_entry_safe(phb, tmp, &hose_list, list_node) | |
101 | eeh_dev_phb_init_dynamic(phb); | |
35e5cfe2 GS |
102 | |
103 | return 0; | |
eb740b5f | 104 | } |
35e5cfe2 GS |
105 | |
106 | core_initcall(eeh_dev_phb_init); |