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intel-iommu: Check for an RMRR which ends before it starts.

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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>
This commit is contained in:
David Woodhouse
2009-12-02 09:21:55 +00:00
parent 6ecbf01c7c
commit 5595b528b4
1 changed files with 10 additions and 0 deletions
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10
drivers/pci/intel-iommu.c
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@@ -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", "IOMMU: Setting identity map for device %s [0x%Lx - 0x%Lx]\n",
pci_name(pdev), start, end); 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)) { if (end >> agaw_to_width(domain->agaw)) {
WARN(1, "Your BIOS is broken; RMRR exceeds permitted address width (%d bits)\n" WARN(1, "Your BIOS is broken; RMRR exceeds permitted address width (%d bits)\n"
"BIOS vendor: %s; Ver: %s; Product Version: %s\n", "BIOS vendor: %s; Ver: %s; Product Version: %s\n",