-
Lu Baolu authored
After commit 327d5b2f ("iommu/vt-d: Allow 32bit devices to uses DMA domain"), swiotlb could also be used for direct memory access if IOMMU is enabled but a device is configured to pass through the DMA translation. Keep swiotlb when IOMMU is forced on, otherwise, some devices won't work if "iommu=pt" kernel parameter is used. Fixes: 327d5b2f ("iommu/vt-d: Allow 32bit devices to uses DMA domain") Reported-and-tested-by:
Adrian Huang <ahuang12@lenovo.com> Signed-off-by:
Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20201125014124.4070776-1-baolu.lu@linux.intel.com Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=210237Signed-off-by:
Will Deacon <will@kernel.org>
e2be2a83