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authorDavid Woodhouse <dwmw2@infradead.org>2008-09-07 19:35:26 +0400
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-09-09 22:42:43 +0400
commitcbda1ba898647aeb4ee770b803c922f595e97731 (patch)
treece58b11c014a3b85f5dcd243f30d80f2a7aba98b /drivers
parent1941246dd98089dd637f44d3bd4f6cc1c61aa9e4 (diff)
downloadlinux-cbda1ba898647aeb4ee770b803c922f595e97731.tar.xz
PCI/iommu: 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. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/intel-iommu.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 8d0e60ac849c..c3edcdc08e72 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -2348,11 +2348,34 @@ static void __init iommu_exit_mempool(void)
}
+static int blacklist_iommu(const struct dmi_system_id *id)
+{
+ printk(KERN_INFO "%s detected; disabling IOMMU\n",
+ id->ident);
+ dmar_disabled = 1;
+ return 0;
+}
+
+static struct dmi_system_id __initdata intel_iommu_dmi_table[] = {
+ { /* Some DG33BU BIOS revisions advertised non-existent VT-d */
+ .callback = blacklist_iommu,
+ .ident = "Intel DG33BU",
+ { DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
+ DMI_MATCH(DMI_BOARD_NAME, "DG33BU"),
+ }
+ },
+ { }
+};
+
+
void __init detect_intel_iommu(void)
{
if (swiotlb || no_iommu || iommu_detected || dmar_disabled)
return;
if (early_dmar_detect()) {
+ dmi_check_system(intel_iommu_dmi_table);
+ if (dmar_disabled)
+ return;
iommu_detected = 1;
}
}