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 * @pdn: PCI 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 pci_dn *pdn, 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_warn("%s: out of memory\n", 61 __func__); 62 return NULL; 63 } 64 65 /* Associate EEH device with OF node */ 66 pdn->edev = edev; 67 edev->pdn = pdn; 68 edev->phb = phb; 69 INIT_LIST_HEAD(&edev->list); 70 INIT_LIST_HEAD(&edev->rmv_list); 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 */ 82void eeh_dev_phb_init_dynamic(struct pci_controller *phb) 83{ 84 struct pci_dn *root = phb->pci_data; 85 86 /* EEH PE for PHB */ 87 eeh_phb_pe_create(phb); 88 89 /* EEH device for PHB */ 90 eeh_dev_init(root, phb); 91 92 /* EEH devices for children OF nodes */ 93 traverse_pci_dn(root, eeh_dev_init, phb); 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 */ 102static int __init eeh_dev_phb_init(void) 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); 108 109 pr_info("EEH: devices created\n"); 110 111 return 0; 112} 113 114core_initcall(eeh_dev_phb_init); 115