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authorDavid Woodhouse <David.Woodhouse@intel.com>2009-12-02 09:21:55 +0000
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-12-08 10:02:52 +0000
commit5595b528b49a702c0428c0762bab60999648254c (patch)
treeaa6c04a00e90eb7ac91e24aa295fc2022de4161d /drivers/pci
parent6ecbf01c7ce4c0f4c3bdfa0e64ac6258328fda6c (diff)
intel-iommu: Check for an RMRR which ends before it starts.
Some HP BIOSes report an RMRR region (a region which needs a 1:1 mapping in the IOMMU for a given device) which has an end address lower than its start address. Detect that and warn, rather than triggering the BUG() in dma_pte_clear_range(). Cc: stable@kernel.org Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/intel-iommu.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index cb5cae3e020..83cabdc118d 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -2000,6 +2000,16 @@ static int iommu_prepare_identity_map(struct pci_dev *pdev,
"IOMMU: Setting identity map for device %s [0x%Lx - 0x%Lx]\n",
pci_name(pdev), start, end);
+ if (end < start) {
+ WARN(1, "Your BIOS is broken; RMRR ends before it starts!\n"
+ "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
+ dmi_get_system_info(DMI_BIOS_VENDOR),
+ dmi_get_system_info(DMI_BIOS_VERSION),
+ dmi_get_system_info(DMI_PRODUCT_VERSION));
+ ret = -EIO;
+ goto error;
+ }
+
if (end >> agaw_to_width(domain->agaw)) {
WARN(1, "Your BIOS is broken; RMRR exceeds permitted address width (%d bits)\n"
"BIOS vendor: %s; Ver: %s; Product Version: %s\n",