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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
eb740b5f GS |
2 | /* |
3 | * The file intends to implement dynamic creation of EEH device, which will | |
4 | * be bound with OF node and PCI device simutaneously. The EEH devices would | |
5 | * be foundamental information for EEH core components to work proerly. Besides, | |
6 | * We have to support multiple situations where dynamic creation of EEH device | |
7 | * is required: | |
8 | * | |
9 | * 1) Before PCI emunation starts, we need create EEH devices according to the | |
10 | * PCI sensitive OF nodes. | |
11 | * 2) When PCI emunation is done, we need do the binding between PCI device and | |
12 | * the associated EEH device. | |
13 | * 3) DR (Dynamic Reconfiguration) would create PCI sensitive OF node. EEH device | |
14 | * will be created while PCI sensitive OF node is detected from DR. | |
15 | * 4) PCI hotplug needs redoing the binding between PCI device and EEH device. If | |
16 | * PHB is newly inserted, we also need create EEH devices accordingly. | |
17 | * | |
18 | * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2012. | |
eb740b5f GS |
19 | */ |
20 | ||
21 | #include <linux/export.h> | |
22 | #include <linux/gfp.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/pci.h> | |
26 | #include <linux/string.h> | |
27 | ||
28 | #include <asm/pci-bridge.h> | |
29 | #include <asm/ppc-pci.h> | |
30 | ||
31 | /** | |
32 | * eeh_dev_init - Create EEH device according to OF node | |
e8e9b34c | 33 | * @pdn: PCI device node |
eb740b5f GS |
34 | * |
35 | * It will create EEH device according to the given OF node. The function | |
36 | * might be called by PCI emunation, DR, PHB hotplug. | |
37 | */ | |
8cc7581c | 38 | struct eeh_dev *eeh_dev_init(struct pci_dn *pdn) |
eb740b5f | 39 | { |
eb740b5f GS |
40 | struct eeh_dev *edev; |
41 | ||
42 | /* Allocate EEH device */ | |
7e4bbaf0 | 43 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
6ab41161 | 44 | if (!edev) |
eb740b5f | 45 | return NULL; |
eb740b5f GS |
46 | |
47 | /* Associate EEH device with OF node */ | |
e8e9b34c GS |
48 | pdn->edev = edev; |
49 | edev->pdn = pdn; | |
7c33a994 OH |
50 | edev->bdfn = (pdn->busno << 8) | pdn->devfn; |
51 | edev->controller = pdn->phb; | |
eb740b5f | 52 | |
8cc7581c | 53 | return edev; |
eb740b5f GS |
54 | } |
55 | ||
56 | /** | |
57 | * eeh_dev_phb_init_dynamic - Create EEH devices for devices included in PHB | |
58 | * @phb: PHB | |
59 | * | |
60 | * Scan the PHB OF node and its child association, then create the | |
61 | * EEH devices accordingly | |
62 | */ | |
cad5cef6 | 63 | void eeh_dev_phb_init_dynamic(struct pci_controller *phb) |
eb740b5f | 64 | { |
55037d17 GS |
65 | /* EEH PE for PHB */ |
66 | eeh_phb_pe_create(phb); | |
eb740b5f | 67 | } |