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Commit 9a08f7d3 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Jesse Barnes
Browse files

x86/PCI: allow MMCONFIG above 4GB 



The current whitelist requires a kernel change for every machine that has
MMCONFIG regions above 4GB, even if BIOS provides a correct MCFG table.

This patch expands the whitelist to include machines with a rev 1 or newer
MCFG table and a DMI_BIOS_DATE of 2010 or later.  That way, we only need
kernel changes for new machines that provide incorrect MCFG tables.

Signed-off-by: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
CC: Matthew Wilcox <willy@linux.intel.com>
CC: John Keller <jpk@sgi.com>
CC: Yinghai Lu <yhlu.kernel@gmail.com>
CC: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
CC: Andi Kleen <andi@firstfloor.org>
Acked-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 2992e545

arch/x86/pci/mmconfig-shared.c

+20 −11
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/acpi.h>

#include <linux/sfi_acpi.h>

#include <linux/bitmap.h>

#include <linux/dmi.h>

#include <linux/sort.h>

#include <asm/e820.h>

#include <asm/pci_x86.h>
@@ -527,20 +528,33 @@ static void __init pci_mmcfg_reject_broken(int early) 


static int __initdata known_bridge;



static int acpi_mcfg_64bit_base_addr __initdata = FALSE;



/* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */

struct acpi_mcfg_allocation *pci_mmcfg_config;

int pci_mmcfg_config_num;



static int __init acpi_mcfg_oem_check(struct acpi_table_mcfg *mcfg)

static int __init acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,

					struct acpi_mcfg_allocation *cfg)

{

	int year;



	if (cfg->address < 0xFFFFFFFF)

		return 0;



	if (!strcmp(mcfg->header.oem_id, "SGI"))

		acpi_mcfg_64bit_base_addr = TRUE;

		return 0;



	if (mcfg->header.revision >= 1) {

		if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) &&

		    year >= 2010)

			return 0;

	}



	printk(KERN_ERR PREFIX "MCFG region for %04x:%02x-%02x at %#llx "

	       "is above 4GB, ignored\n", cfg->pci_segment,

	       cfg->start_bus_number, cfg->end_bus_number, cfg->address);

	return -EINVAL;

}



static int __init pci_parse_mcfg(struct acpi_table_header *header)

{

	struct acpi_table_mcfg *mcfg;
@@ -574,13 +588,8 @@ static int __init pci_parse_mcfg(struct acpi_table_header *header) 


	memcpy(pci_mmcfg_config, &mcfg[1], config_size);



	acpi_mcfg_oem_check(mcfg);



	for (i = 0; i < pci_mmcfg_config_num; ++i) {

		if ((pci_mmcfg_config[i].address > 0xFFFFFFFF) &&

		    !acpi_mcfg_64bit_base_addr) {

			printk(KERN_ERR PREFIX

			       "MMCONFIG not in low 4GB of memory\n");

		if (acpi_mcfg_check_entry(mcfg, &pci_mmcfg_config[i])) {

			kfree(pci_mmcfg_config);

			pci_mmcfg_config_num = 0;

			return -ENODEV;