intel-iommu: Workaround IOTLB hang on Ironlake GPU
To work around a hardware issue, we have to submit IOTLB flushes while the graphics engine is idle. The graphics driver will (we hope) go to great lengths to ensure that it gets that right on the affected chipset(s)... so let's not screw it over by deferring the unmap and doing it later. That wouldn't be very helpful. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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@ -3950,6 +3950,10 @@ static void __devinit quirk_calpella_no_shadow_gtt(struct pci_dev *dev)
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if (!(ggc & GGC_MEMORY_VT_ENABLED)) {
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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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} else if (dmar_map_gfx) {
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/* we have to ensure the gfx device is idle before we flush */
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printk(KERN_INFO "DMAR: Disabling batched IOTLB flush on Ironlake\n");
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intel_iommu_strict = 1;
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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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