/*
* Copyright (c) 2006, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* Copyright (C) 2006-2008 Intel Corporation
* Author: Ashok Raj <ashok.raj@intel.com>
* Author: Shaohua Li <shaohua.li@intel.com>
* Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
*
* This file implements early detection/parsing of Remapping Devices
* reported to OS through BIOS via DMA remapping reporting (DMAR) ACPI
* tables.
*
* These routines are used by both DMA-remapping and Interrupt-remapping
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt /* has to precede printk.h */
#include <linux/pci.h>
#include <linux/dmar.h>
#include <linux/iova.h>
#include <linux/intel-iommu.h>
#include <linux/timer.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/tboot.h>
#include <linux/dmi.h>
#include <linux/slab.h>
#include <asm/irq_remapping.h>
#include <asm/iommu_table.h>
#include "irq_remapping.h"
/* No locks are needed as DMA remapping hardware unit
* list is constructed at boot time and hotplug of
* these units are not supported by the architecture.
*/
LIST_HEAD(dmar_drhd_units);
struct acpi_table_header * __initdata dmar_tbl;
static acpi_size dmar_tbl_size;
static void __init dmar_register_drhd_unit(struct dmar_drhd_unit *drhd)
{
/*
* add INCLUDE_ALL at the tail, so scan the list will find it at
* the very end.
*/
if (drhd->include_all)
list_add_tail(&drhd->list, &dmar_drhd_units);
else
list_add(&drhd->list, &dmar_drhd_units);
}
static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope,
struct pci_dev **dev, u16 segment)
{
struct pci_bus *bus;
struct pci_dev *pdev = NULL;
struct acpi_dmar_pci_path *path;
int count;
bus = pci_find_bus(segment, scope->bus);
path = (struct acpi_dmar_pci_path *)(scope + 1);
count = (scope->length - sizeof(struct acpi_dmar_device_scope))
/ sizeof(struct acpi_dmar_pci_path);
while (count)