intel-iommu: Abort IOMMU setup for igfx if BIOS gave no shadow GTT space
Yet another BIOS bug; Lenovo this time (X201). Red Hat bug #593516. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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@ -3761,6 +3761,23 @@ static void __devinit quirk_iommu_rwbf(struct pci_dev *dev)
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf);
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf);
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static void __devinit quirk_calpella_no_shadow_gtt(struct pci_dev *dev)
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{
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unsigned short ggc;
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if (pci_read_config_word(dev, 0x52, &ggc))
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return;
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if (!(ggc & 0x800)) {
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printk(KERN_INFO "DMAR: BIOS has allocated no shadow GTT; disabling IOMMU for graphics\n");
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dmar_map_gfx = 0;
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}
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}
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0040, quirk_calpella_no_shadow_gtt);
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0044, quirk_calpella_no_shadow_gtt);
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0062, quirk_calpella_no_shadow_gtt);
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x006a, quirk_calpella_no_shadow_gtt);
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/* On Tylersburg chipsets, some BIOSes have been known to enable the
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/* On Tylersburg chipsets, some BIOSes have been known to enable the
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ISOCH DMAR unit for the Azalia sound device, but not give it any
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ISOCH DMAR unit for the Azalia sound device, but not give it any
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TLB entries, which causes it to deadlock. Check for that. We do
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TLB entries, which causes it to deadlock. Check for that. We do
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