linux-imx

/*

 * IOAPIC/IOxAPIC/IOSAPIC driver

 *

 * Copyright (C) 2009 Fujitsu Limited.

 * (c) Copyright 2009 Hewlett-Packard Development Company, L.P.

 *

 * Copyright (C) 2014 Intel Corporation

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * Based on original drivers/pci/ioapic.c

 *  Yinghai Lu <yinghai@kernel.org>

 *  Jiang Liu <jiang.liu@intel.com>

 */

​

/*

 * This driver manages I/O APICs added by hotplug after boot.

 * We try to claim all I/O APIC devices, but those present at boot were

 * registered when we parsed the ACPI MADT.

 */

​

#define pr_fmt(fmt) "ACPI: IOAPIC: " fmt

​

#include <linux/slab.h>

#include <linux/acpi.h>

#include <linux/pci.h>

#include <acpi/acpi.h>

​

struct acpi_pci_ioapic {

    acpi_handle root_handle;

    acpi_handle handle;

    u32     gsi_base;

    struct resource res;

    struct pci_dev  *pdev;

    struct list_head list;

};

​

static LIST_HEAD(ioapic_list);

static DEFINE_MUTEX(ioapic_list_lock);

​

static acpi_status setup_res(struct acpi_resource *acpi_res, void *data)

{

    struct resource *res = data;

    struct resource_win win;

​

    /*

     * We might assign this to 'res' later, make sure all pointers are

     * cleared before the resource is added to the global list

     */

    memset(&win, 0, sizeof(win));

​

    res->flags = 0;

    if (acpi_dev_filter_resource_type(acpi_res, IORESOURCE_MEM))

        return AE_OK;

​

    if (!acpi_dev_resource_memory(acpi_res, res)) {

        if (acpi_dev_resource_address_space(acpi_res, &win) ||

            acpi_dev_resource_ext_address_space(acpi_res, &win))

            *res = win.res;

    }

    if ((res->flags & IORESOURCE_PREFETCH) ||