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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: Bjorn 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: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Bjorn Helgaas 2009-10-23 15:20:33 -06:00 committed by Jesse Barnes
parent 2992e545ea
commit 9a08f7d350
1 changed files with 21 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
arch/x86/pci/mmconfig-shared.c
View File

@ -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>
@ -527,18 +528,31 @@ reject:
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)
{
if (!strcmp(mcfg->header.oem_id, "SGI"))
acpi_mcfg_64bit_base_addr = TRUE;
int year;
if (cfg->address < 0xFFFFFFFF)
return 0;
if (!strcmp(mcfg->header.oem_id, "SGI"))
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)
@ -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;