diff options
Diffstat (limited to 'drivers/iommu/Kconfig')
| -rw-r--r-- | drivers/iommu/Kconfig | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 6f07f3b21816..83664db5221d 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -1,3 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only # The IOVA library may also be used by non-IOMMU_API users config IOMMU_IOVA tristate @@ -94,6 +95,7 @@ config IOMMU_DMA bool select IOMMU_API select IOMMU_IOVA + select IRQ_MSI_IOMMU select NEED_SG_DMA_LENGTH config FSL_PAMU @@ -359,6 +361,31 @@ config ARM_SMMU Say Y here if your SoC includes an IOMMU device implementing the ARM SMMU architecture. +config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT + bool "Default to disabling bypass on ARM SMMU v1 and v2" + depends on ARM_SMMU + default y + help + Say Y here to (by default) disable bypass streams such that + incoming transactions from devices that are not attached to + an iommu domain will report an abort back to the device and + will not be allowed to pass through the SMMU. + + Any old kernels that existed before this KConfig was + introduced would default to _allowing_ bypass (AKA the + equivalent of NO for this config). However the default for + this option is YES because the old behavior is insecure. + + There are few reasons to allow unmatched stream bypass, and + even fewer good ones. If saying YES here breaks your board + you should work on fixing your board. This KConfig option + is expected to be removed in the future and we'll simply + hardcode the bypass disable in the code. + + NOTE: the kernel command line parameter + 'arm-smmu.disable_bypass' will continue to override this + config. + config ARM_SMMU_V3 bool "ARM Ltd. System MMU Version 3 (SMMUv3) Support" depends on ARM64 |