1 // SPDX-License-Identifier: GPL-2.0-or-later
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.
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
33 * @pdn: PCI device node
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 */
38 struct eeh_dev *eeh_dev_init(struct pci_dn *pdn)
39 {
40 struct eeh_dev *edev;
41
42 /* Allocate EEH device */
43 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
44 if (!edev)
45 return NULL;
46
47 /* Associate EEH device with OF node */
48 pdn->edev = edev;
49 edev->pdn = pdn;
50 edev->bdfn = (pdn->busno << 8) | pdn->devfn;
51 edev->controller = pdn->phb;
52
53 return edev;
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 */
63 void eeh_dev_phb_init_dynamic(struct pci_controller *phb)
64 {
65 /* EEH PE for PHB */
66 eeh_phb_pe_create(phb);
67 }