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x86: blacklist DMAR on Intel G31/G33 chipsets 

Some BIOSes (the Intel DG33BU, for example) wrongly claim to have DMAR
when they don't. Avoid the resulting crashes when it doesn't work as
expected.

I'd still be grateful if someone could test it on a DG33BU with the old
BIOS though, since I've killed mine. I tested the DMI version, but not
this one.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
David Woodhouse 2008-09-04 09:54:37 +01:00 committed by Ingo Molnar
parent cf169702ba
commit e51af66308
3 changed files with 20 additions and 1 deletions
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18
arch/x86/kernel/early-quirks.c
View File

@ -95,6 +95,20 @@ static void __init nvidia_bugs(int num, int slot, int func)
}
#ifdef CONFIG_DMAR
static void __init intel_g33_dmar(int num, int slot, int func)
{
struct acpi_table_header *dmar_tbl;
acpi_status status;
status = acpi_get_table(ACPI_SIG_DMAR, 0, &dmar_tbl);
if (ACPI_SUCCESS(status)) {
printk(KERN_INFO "BIOS BUG: DMAR advertised on Intel G31/G33 chipset -- ignoring\n");
dmar_disabled = 1;
}
}
#endif
#define QFLAG_APPLY_ONCE 0x1
#define QFLAG_APPLIED 0x2
#define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
@ -114,6 +128,10 @@ static struct chipset early_qrk[] __initdata = {
PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
#ifdef CONFIG_DMAR
{ PCI_VENDOR_ID_INTEL, 0x29c0,
PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, intel_g33_dmar },
#endif
{}
};

2
drivers/pci/intel-iommu.c
View File

@ -80,7 +80,7 @@ static long list_size;
static void domain_remove_dev_info(struct dmar_domain *domain);
static int dmar_disabled;
int dmar_disabled;
static int __initdata dmar_map_gfx = 1;
static int dmar_forcedac;
static int intel_iommu_strict;

1
include/asm-x86/iommu.h
View File

@ -6,6 +6,7 @@ extern void no_iommu_init(void);
extern struct dma_mapping_ops nommu_dma_ops;
extern int force_iommu, no_iommu;
extern int iommu_detected;
extern int dmar_disabled;
extern unsigned long iommu_num_pages(unsigned long addr, unsigned long len);