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| author | Joerg Roedel <joerg.roedel@amd.com> | 2008-08-14 19:55:16 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-08-15 13:56:54 +0200 |
| commit | 9f5f5fb35d2934fe7dc0cb019854a030efd10cd7 (patch) | |
| tree | 061412d890a702fddb46ac259080a963dce939f4 /arch/x86/kernel/amd_iommu_init.c | |
| parent | 519c31bacf78a969efa8d2e55ed8862848f28590 (diff) | |
| download | lwn-9f5f5fb35d2934fe7dc0cb019854a030efd10cd7.tar.gz lwn-9f5f5fb35d2934fe7dc0cb019854a030efd10cd7.zip | |
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/x86/kernel/amd_iommu_init.c')
| -rw-r--r-- | arch/x86/kernel/amd_iommu_init.c | 18 |
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 d9a9da597e79..ceba33811537 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 */ |