eeh_dev.c

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/*
 * 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>

void * __devinit 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_warning("%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;
}

void __devinit 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);
}

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);