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SubjectRe: [discuss] Re: Please pull x86-64 bug fixes
Linus Torvalds wrote:
> (And we should probably have the "pci=mmiocfg" kernel command line entry
> that forces MMIOCFG regardless of any e820 issues, even for normal
> accesses).

Something like this?


Signed-off-by: Jeff Garzik <jeff@garzik.org>

---
arch/i386/pci/common.c | 4 ++++
arch/i386/pci/mmconfig.c | 3 ++-
arch/x86_64/pci/mmconfig.c | 3 ++-
3 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/i386/pci/common.c b/arch/i386/pci/common.c
index 68bce19..38d9f4f 100644
--- a/arch/i386/pci/common.c
+++ b/arch/i386/pci/common.c
@@ -237,6 +237,10 @@ #ifdef CONFIG_PCI_MMCONFIG
pci_probe &= ~PCI_PROBE_MMCONF;
return NULL;
}
+ else if (!strcmp(str, "mmconf")) {
+ pci_probe |= PCI_PROBE_MMCONF | PCI_NO_CHECKS;
+ return NULL;
+ }
#endif
else if (!strcmp(str, "noacpi")) {
acpi_noirq_set();
diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
index d0c3da3..056cb0a 100644
--- a/arch/i386/pci/mmconfig.c
+++ b/arch/i386/pci/mmconfig.c
@@ -237,7 +237,8 @@ void __init pci_mmcfg_init(int type)

/* Only do this check when type 1 works. If it doesn't work
assume we run on a Mac and always use MCFG */
- if (type == 1 && !e820_all_mapped(pci_mmcfg_config[0].base_address,
+ if ((type == 1) && (!(pci_probe & PCI_NO_CHECKS)) &&
+ !e820_all_mapped(pci_mmcfg_config[0].base_address,
pci_mmcfg_config[0].base_address + MMCONFIG_APER_MIN,
E820_RESERVED)) {
printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %x is not E820-reserved\n",
diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index 7732f42..d942fc7 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -209,7 +209,8 @@ void __init pci_mmcfg_init(int type)

/* Only do this check when type 1 works. If it doesn't work
assume we run on a Mac and always use MCFG */
- if (type == 1 && !e820_all_mapped(pci_mmcfg_config[0].base_address,
+ if ((type == 1) && (!(pci_probe & PCI_NO_CHECKS)) &&
+ !e820_all_mapped(pci_mmcfg_config[0].base_address,
pci_mmcfg_config[0].base_address + MMCONFIG_APER_MIN,
E820_RESERVED)) {
printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %x is not E820-reserved\n",
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