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authorJoerg Roedel <joerg.roedel@amd.com>2008-08-14 19:55:16 +0200
committerIngo Molnar <mingo@elte.hu>2008-08-15 13:56:54 +0200
commit9f5f5fb35d2934fe7dc0cb019854a030efd10cd7 (patch)
tree061412d890a702fddb46ac259080a963dce939f4 /arch
parent519c31bacf78a969efa8d2e55ed8862848f28590 (diff)
x86, AMD IOMMU: initialize device table properly
This patch adds device table initializations which forbids memory accesses for devices per default and disables all page faults. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/amd_iommu_init.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index d9a9da597e7..ceba3381153 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -801,6 +801,21 @@ static int __init init_memory_definitions(struct acpi_table_header *table)
}
/*
+ * 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
*/