x86, AMD IOMMU: initialize device table properly

[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / amd_iommu_init.c

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index d9a9da597e796cbcda869180879a7804888e70ea..ceba33811537336dd4948350fa7a8433b978463e 100644 (file)
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -800,6 +800,21 @@ static int __init init_memory_definitions(struct acpi_table_header *table)
        return 0;
 }
 
+/*
+ * Init the device table to not allow DMA access for devices and
+ * suppress all page faults
+ */
+static void init_device_table(void)
+{
+       u16 devid;
+
+       for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
+               set_dev_entry_bit(devid, DEV_ENTRY_VALID);
+               set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION);
+               set_dev_entry_bit(devid, DEV_ENTRY_NO_PAGE_FAULT);
+       }
+}
+
 /*
  * This function finally enables all IOMMUs found in the system after
  * they have been initialized
@@ -931,6 +946,9 @@ int __init amd_iommu_init(void)
        if (amd_iommu_pd_alloc_bitmap == NULL)
                goto free;
 
+       /* init the device table */
+       init_device_table();
+
        /*
         * let all alias entries point to itself
         */