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 */
 52void *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 = kzalloc(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 */
 65	PCI_DN(dn)->edev = edev;
 66	edev->dn  = dn;
 67	edev->phb = phb;
 68	INIT_LIST_HEAD(&edev->list);
 69
 70	return NULL;
 71}
 72
 73/**
 74 * eeh_dev_phb_init_dynamic - Create EEH devices for devices included in PHB
 75 * @phb: PHB
 76 *
 77 * Scan the PHB OF node and its child association, then create the
 78 * EEH devices accordingly
 79 */
 80void eeh_dev_phb_init_dynamic(struct pci_controller *phb)
 81{
 82	struct device_node *dn = phb->dn;
 83
 84	/* EEH PE for PHB */
 85	eeh_phb_pe_create(phb);
 86
 87	/* EEH device for PHB */
 88	eeh_dev_init(dn, phb);
 89
 90	/* EEH devices for children OF nodes */
 91	traverse_pci_devices(dn, eeh_dev_init, phb);
 92}
 93
 94/**
 95 * eeh_dev_phb_init - Create EEH devices for devices included in existing PHBs
 96 *
 97 * Scan all the existing PHBs and create EEH devices for their OF
 98 * nodes and their children OF nodes
 99 */
100static int __init eeh_dev_phb_init(void)
101{
102	struct pci_controller *phb, *tmp;
103
104	list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
105		eeh_dev_phb_init_dynamic(phb);
106
107	pr_info("EEH: devices created\n");
108
109	return 0;
110}
111
112core_initcall(eeh_dev_phb_init);