![Fenghua Yu](/assets/img/avatar_default.png)
Add and changes a few sanity checks in dmar.c. 1. The haw field in ACPI DMAR table in VT-d spec doesn't describe the range of haw. But since DMA page size is 4KB in DMA remapping, haw should be at least 4KB. The current VT-d code in dmar.c returns failure when haw==0. This sanity check is not accurate and execution can pass when haw is less than one page size 4KB. This patch changes the haw sanity check to validate if haw is less than 4KB. 2. Add dmar_rmrr_units verification. 3. Add parse_dmar_table() verification. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Acked-by: mark gross <mgross@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
344 lines
8.4 KiB
C
344 lines
8.4 KiB
C
/*
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* Copyright (c) 2006, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Copyright (C) Ashok Raj <ashok.raj@intel.com>
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* Copyright (C) Shaohua Li <shaohua.li@intel.com>
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* Copyright (C) Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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*
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* This file implements early detection/parsing of DMA Remapping Devices
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* reported to OS through BIOS via DMA remapping reporting (DMAR) ACPI
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* tables.
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*/
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#include <linux/pci.h>
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#include <linux/dmar.h>
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#include "iova.h"
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#undef PREFIX
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#define PREFIX "DMAR:"
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/* No locks are needed as DMA remapping hardware unit
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* list is constructed at boot time and hotplug of
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* these units are not supported by the architecture.
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*/
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LIST_HEAD(dmar_drhd_units);
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LIST_HEAD(dmar_rmrr_units);
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static struct acpi_table_header * __initdata dmar_tbl;
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static void __init dmar_register_drhd_unit(struct dmar_drhd_unit *drhd)
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{
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/*
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* add INCLUDE_ALL at the tail, so scan the list will find it at
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* the very end.
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*/
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if (drhd->include_all)
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list_add_tail(&drhd->list, &dmar_drhd_units);
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else
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list_add(&drhd->list, &dmar_drhd_units);
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}
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static void __init dmar_register_rmrr_unit(struct dmar_rmrr_unit *rmrr)
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{
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list_add(&rmrr->list, &dmar_rmrr_units);
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}
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static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope,
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struct pci_dev **dev, u16 segment)
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{
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struct pci_bus *bus;
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struct pci_dev *pdev = NULL;
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struct acpi_dmar_pci_path *path;
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int count;
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bus = pci_find_bus(segment, scope->bus);
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path = (struct acpi_dmar_pci_path *)(scope + 1);
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count = (scope->length - sizeof(struct acpi_dmar_device_scope))
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/ sizeof(struct acpi_dmar_pci_path);
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while (count) {
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if (pdev)
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pci_dev_put(pdev);
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/*
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* Some BIOSes list non-exist devices in DMAR table, just
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* ignore it
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*/
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if (!bus) {
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printk(KERN_WARNING
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PREFIX "Device scope bus [%d] not found\n",
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scope->bus);
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break;
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}
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pdev = pci_get_slot(bus, PCI_DEVFN(path->dev, path->fn));
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if (!pdev) {
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printk(KERN_WARNING PREFIX
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"Device scope device [%04x:%02x:%02x.%02x] not found\n",
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segment, bus->number, path->dev, path->fn);
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break;
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}
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path ++;
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count --;
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bus = pdev->subordinate;
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}
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if (!pdev) {
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printk(KERN_WARNING PREFIX
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"Device scope device [%04x:%02x:%02x.%02x] not found\n",
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segment, scope->bus, path->dev, path->fn);
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*dev = NULL;
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return 0;
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}
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if ((scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT && \
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pdev->subordinate) || (scope->entry_type == \
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ACPI_DMAR_SCOPE_TYPE_BRIDGE && !pdev->subordinate)) {
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pci_dev_put(pdev);
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printk(KERN_WARNING PREFIX
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"Device scope type does not match for %s\n",
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pci_name(pdev));
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return -EINVAL;
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}
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*dev = pdev;
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return 0;
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}
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static int __init dmar_parse_dev_scope(void *start, void *end, int *cnt,
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struct pci_dev ***devices, u16 segment)
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{
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struct acpi_dmar_device_scope *scope;
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void * tmp = start;
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int index;
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int ret;
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*cnt = 0;
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while (start < end) {
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scope = start;
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if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT ||
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scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE)
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(*cnt)++;
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else
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printk(KERN_WARNING PREFIX
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"Unsupported device scope\n");
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start += scope->length;
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}
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if (*cnt == 0)
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return 0;
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*devices = kcalloc(*cnt, sizeof(struct pci_dev *), GFP_KERNEL);
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if (!*devices)
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return -ENOMEM;
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start = tmp;
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index = 0;
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while (start < end) {
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scope = start;
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if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT ||
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scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE) {
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ret = dmar_parse_one_dev_scope(scope,
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&(*devices)[index], segment);
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if (ret) {
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kfree(*devices);
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return ret;
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}
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index ++;
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}
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start += scope->length;
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}
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return 0;
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}
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/**
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* dmar_parse_one_drhd - parses exactly one DMA remapping hardware definition
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* structure which uniquely represent one DMA remapping hardware unit
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* present in the platform
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*/
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static int __init
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dmar_parse_one_drhd(struct acpi_dmar_header *header)
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{
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struct acpi_dmar_hardware_unit *drhd;
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struct dmar_drhd_unit *dmaru;
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int ret = 0;
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static int include_all;
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dmaru = kzalloc(sizeof(*dmaru), GFP_KERNEL);
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if (!dmaru)
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return -ENOMEM;
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drhd = (struct acpi_dmar_hardware_unit *)header;
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dmaru->reg_base_addr = drhd->address;
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dmaru->include_all = drhd->flags & 0x1; /* BIT0: INCLUDE_ALL */
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if (!dmaru->include_all)
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ret = dmar_parse_dev_scope((void *)(drhd + 1),
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((void *)drhd) + header->length,
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&dmaru->devices_cnt, &dmaru->devices,
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drhd->segment);
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else {
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/* Only allow one INCLUDE_ALL */
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if (include_all) {
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printk(KERN_WARNING PREFIX "Only one INCLUDE_ALL "
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"device scope is allowed\n");
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ret = -EINVAL;
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}
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include_all = 1;
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}
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if (ret || (dmaru->devices_cnt == 0 && !dmaru->include_all))
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kfree(dmaru);
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else
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dmar_register_drhd_unit(dmaru);
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return ret;
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}
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static int __init
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dmar_parse_one_rmrr(struct acpi_dmar_header *header)
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{
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struct acpi_dmar_reserved_memory *rmrr;
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struct dmar_rmrr_unit *rmrru;
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int ret = 0;
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rmrru = kzalloc(sizeof(*rmrru), GFP_KERNEL);
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if (!rmrru)
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return -ENOMEM;
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rmrr = (struct acpi_dmar_reserved_memory *)header;
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rmrru->base_address = rmrr->base_address;
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rmrru->end_address = rmrr->end_address;
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ret = dmar_parse_dev_scope((void *)(rmrr + 1),
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((void *)rmrr) + header->length,
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&rmrru->devices_cnt, &rmrru->devices, rmrr->segment);
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if (ret || (rmrru->devices_cnt == 0))
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kfree(rmrru);
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else
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dmar_register_rmrr_unit(rmrru);
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return ret;
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}
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static void __init
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dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
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{
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struct acpi_dmar_hardware_unit *drhd;
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struct acpi_dmar_reserved_memory *rmrr;
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switch (header->type) {
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case ACPI_DMAR_TYPE_HARDWARE_UNIT:
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drhd = (struct acpi_dmar_hardware_unit *)header;
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printk (KERN_INFO PREFIX
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"DRHD (flags: 0x%08x)base: 0x%016Lx\n",
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drhd->flags, drhd->address);
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break;
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case ACPI_DMAR_TYPE_RESERVED_MEMORY:
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rmrr = (struct acpi_dmar_reserved_memory *)header;
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printk (KERN_INFO PREFIX
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"RMRR base: 0x%016Lx end: 0x%016Lx\n",
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rmrr->base_address, rmrr->end_address);
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break;
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}
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}
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/**
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* parse_dmar_table - parses the DMA reporting table
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*/
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static int __init
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parse_dmar_table(void)
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{
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struct acpi_table_dmar *dmar;
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struct acpi_dmar_header *entry_header;
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int ret = 0;
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dmar = (struct acpi_table_dmar *)dmar_tbl;
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if (!dmar)
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return -ENODEV;
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if (dmar->width < PAGE_SHIFT_4K - 1) {
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printk(KERN_WARNING PREFIX "Invalid DMAR haw\n");
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return -EINVAL;
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}
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printk (KERN_INFO PREFIX "Host address width %d\n",
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dmar->width + 1);
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entry_header = (struct acpi_dmar_header *)(dmar + 1);
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while (((unsigned long)entry_header) <
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(((unsigned long)dmar) + dmar_tbl->length)) {
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dmar_table_print_dmar_entry(entry_header);
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switch (entry_header->type) {
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case ACPI_DMAR_TYPE_HARDWARE_UNIT:
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ret = dmar_parse_one_drhd(entry_header);
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break;
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case ACPI_DMAR_TYPE_RESERVED_MEMORY:
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ret = dmar_parse_one_rmrr(entry_header);
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break;
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default:
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printk(KERN_WARNING PREFIX
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"Unknown DMAR structure type\n");
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ret = 0; /* for forward compatibility */
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break;
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}
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if (ret)
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break;
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entry_header = ((void *)entry_header + entry_header->length);
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}
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return ret;
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}
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int __init dmar_table_init(void)
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{
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int ret;
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ret = parse_dmar_table();
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if (ret) {
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printk(KERN_INFO PREFIX "parse DMAR table failure.\n");
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return ret;
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}
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if (list_empty(&dmar_drhd_units)) {
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printk(KERN_INFO PREFIX "No DMAR devices found\n");
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return -ENODEV;
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}
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if (list_empty(&dmar_rmrr_units)) {
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printk(KERN_INFO PREFIX "No RMRR found\n");
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return -ENODEV;
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}
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return 0;
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}
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/**
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* early_dmar_detect - checks to see if the platform supports DMAR devices
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*/
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int __init early_dmar_detect(void)
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{
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acpi_status status = AE_OK;
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/* if we could find DMAR table, then there are DMAR devices */
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status = acpi_get_table(ACPI_SIG_DMAR, 0,
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(struct acpi_table_header **)&dmar_tbl);
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if (ACPI_SUCCESS(status) && !dmar_tbl) {
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printk (KERN_WARNING PREFIX "Unable to map DMAR\n");
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status = AE_NOT_FOUND;
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}
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return (ACPI_SUCCESS(status) ? 1 : 0);
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}
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