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authorLu Baolu <baolu.lu@linux.intel.com>2019-05-02 03:34:26 +0200
committerJoerg Roedel <jroedel@suse.de>2019-05-03 17:31:32 +0200
commit5daab58043ee2bca861068e2595564828f3bc663 (patch)
treed710574676cbfa1355a7280449d457a828376bd6 /drivers/iommu
parentiommu/vt-d: Set intel_iommu_gfx_mapped correctly (diff)
downloadlinux-5daab58043ee2bca861068e2595564828f3bc663.tar.xz
linux-5daab58043ee2bca861068e2595564828f3bc663.zip
iommu/vt-d: Make kernel parameter igfx_off work with vIOMMU
The kernel parameter igfx_off is used by users to disable DMA remapping for the Intel integrated graphic device. It was designed for bare metal cases where a dedicated IOMMU is used for graphic. This doesn't apply to virtual IOMMU case where an include-all IOMMU is used. This makes the kernel parameter work with virtual IOMMU as well. Cc: Ashok Raj <ashok.raj@intel.com> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com> Suggested-by: Kevin Tian <kevin.tian@intel.com> Fixes: c0771df8d5297 ("intel-iommu: Export a flag indicating that the IOMMU is used for iGFX.") Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Tested-by: Zhenyu Wang <zhenyuw@linux.intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel-iommu.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index a814c95f73ce..a320bda2c305 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3415,9 +3415,12 @@ static int __init init_dmars(void)
iommu_identity_mapping |= IDENTMAP_ALL;
#ifdef CONFIG_INTEL_IOMMU_BROKEN_GFX_WA
- iommu_identity_mapping |= IDENTMAP_GFX;
+ dmar_map_gfx = 0;
#endif
+ if (!dmar_map_gfx)
+ iommu_identity_mapping |= IDENTMAP_GFX;
+
check_tylersburg_isoch();
if (iommu_identity_mapping) {