1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 5ac2aa783f58..4789f8e8bf7a 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -3757,6 +3757,33 @@ static void __devinit quirk_iommu_rwbf(struct pci_dev *dev)
 
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf);
 
+#define GGC 0x52
+#define GGC_MEMORY_SIZE_MASK    (0xf << 8)
+#define GGC_MEMORY_SIZE_NONE    (0x0 << 8)
+#define GGC_MEMORY_SIZE_1M      (0x1 << 8)
+#define GGC_MEMORY_SIZE_2M      (0x3 << 8)
+#define GGC_MEMORY_VT_ENABLED   (0x8 << 8)
+#define GGC_MEMORY_SIZE_2M_VT   (0x9 << 8)
+#define GGC_MEMORY_SIZE_3M_VT   (0xa << 8)
+#define GGC_MEMORY_SIZE_4M_VT   (0xb << 8)
+
+static void __devinit quirk_calpella_no_shadow_gtt(struct pci_dev *dev)
+{
+        unsigned short ggc;
+
+        if (pci_read_config_word(dev, GGC, &ggc))
+                return;
+
+        if (!(ggc & GGC_MEMORY_VT_ENABLED)) {
+                printk(KERN_INFO "DMAR: BIOS has allocated no shadow GTT; disabling IOMMU for graphics\n");
+                dmar_map_gfx = 0;
+        }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0040, quirk_calpella_no_shadow_gtt);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0044, quirk_calpella_no_shadow_gtt);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0062, quirk_calpella_no_shadow_gtt);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x006a, quirk_calpella_no_shadow_gtt);
+
 /* On Tylersburg chipsets, some BIOSes have been known to enable the
    ISOCH DMAR unit for the Azalia sound device, but not give it any
    TLB entries, which causes it to deadlock. Check for that.  We do