1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 358dd406fe2..4905e0e3a64 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -1602,6 +1602,36 @@ static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr,
                 rmrr->end_address + 1);
 }
 
+#ifdef CONFIG_DMAR_GFX_WA
+extern int arch_get_ram_range(int slot, u64 *addr, u64 *size);
+static void __init iommu_prepare_gfx_mapping(void)
+{
+        struct pci_dev *pdev = NULL;
+        u64 base, size;
+        int slot;
+        int ret;
+
+        for_each_pci_dev(pdev) {
+                if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO ||
+                                !IS_GFX_DEVICE(pdev))
+                        continue;
+                printk(KERN_INFO "IOMMU: gfx device %s 1-1 mapping\n",
+                        pci_name(pdev));
+                slot = arch_get_ram_range(0, &base, &size);
+                while (slot >= 0) {
+                        ret = iommu_prepare_identity_map(pdev,
+                                        base, base + size);
+                        if (ret)
+                                goto error;
+                        slot = arch_get_ram_range(slot, &base, &size);
+                }
+                continue;
+error:
+                printk(KERN_ERR "IOMMU: mapping reserved region failed\n");
+        }
+}
+#endif
+
 int __init init_dmars(void)
 {
         struct dmar_drhd_unit *drhd;
@@ -1665,6 +1695,8 @@ int __init init_dmars(void)
                 }
         }
 
+        iommu_prepare_gfx_mapping();
+
         /*
          * for each drhd
          *   enable fault log
@@ -2176,3 +2208,4 @@ int __init intel_iommu_init(void)
         dma_ops = &intel_dma_ops;
         return 0;
 }
+