/*
* The file intends to implement dynamic creation of EEH device, which will
* be bound with OF node and PCI device simutaneously. The EEH devices would
* be foundamental information for EEH core components to work proerly. Besides,
* We have to support multiple situations where dynamic creation of EEH device
* is required:
*
* 1) Before PCI emunation starts, we need create EEH devices according to the
* PCI sensitive OF nodes.
* 2) When PCI emunation is done, we need do the binding between PCI device and
* the associated EEH device.
* 3) DR (Dynamic Reconfiguration) would create PCI sensitive OF node. EEH device
* will be created while PCI sensitive OF node is detected from DR.
* 4) PCI hotplug needs redoing the binding between PCI device and EEH device. If
* PHB is newly inserted, we also need create EEH devices accordingly.
*
* Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2012.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/export.h>
#include <linux/gfp.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>
/**
* eeh_dev_init - Create EEH device according to OF node
* @dn: device node
* @data: PHB
*
* It will create EEH device according to the given OF node. The function
* might be called by PCI emunation, DR, PHB hotplug.
*/
void *eeh_dev_init(struct device_node *dn, void *data)
{
struct pci_controller *phb = data;
struct eeh_dev *edev;
/* Allocate EEH device */
edev = kzalloc(sizeof(*edev), GFP_KERNEL);
if (!edev) {
pr_warn("%s: out of memory\n",
__func__);
return NULL;
}
/* Associate EEH device with OF node */
PCI_DN(dn)->edev = edev;
edev->dn = dn;
edev->phb = phb;
INIT_LIST_HEAD(&edev->list);
return NULL;
}
/**
* eeh_dev_phb_init_dynamic - Create EEH devices for devices included in PHB
* @phb: PHB
*
* Scan the PHB OF node and its child association, then create the
* EEH devices accordingly
*/
void eeh_dev_phb_init_dynamic(struct pci_controller *phb)
{
struct device_node *dn = phb->dn;
/* EEH PE for PHB */
eeh_phb_pe_create(phb);
/* EEH device for PHB */
eeh_dev_init(dn, phb);
/* EEH devices for children OF nodes */
traverse_pci_devices(dn, eeh_dev_init, phb);
}
/**
* eeh_dev_phb_init - Create EEH devices for devices included in existing PHBs
*
* Scan all the existing PHBs and create EEH devices for their OF
* nodes and their children OF nodes
*/
static int __init eeh_dev_phb_init(void)
{
struct pci_controller *phb, *tmp;
list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
eeh_dev_phb_init_dynamic(phb);
pr_info("EEH: devices created\n");
return 0;
}
core_initcall(eeh_dev_phb_init);
