This allows the default behaviour to be controlled by a kernel config option instead of changing the command line for the kernel to include "iommu.strict=0" on ARM64 where this is desired.
This is similar to CONFIG_IOMMU_DEFAULT_PASSTHROUGH. Note: At present, intel_iommu, amd_iommu and s390_iommu use lazy mode as defalut, so there is no need to add code for them. Signed-off-by: Zhen Lei <[email protected]> --- drivers/iommu/Kconfig | 14 ++++++++++++++ drivers/iommu/iommu.c | 5 +++++ 2 files changed, 19 insertions(+) diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 6f07f3b21816c64..5ec9780f564eaf8 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -85,6 +85,20 @@ config IOMMU_DEFAULT_PASSTHROUGH If unsure, say N here. +config IOMMU_LAZY_MODE + bool "IOMMU use lazy mode to flush IOTLB and free IOVA" + depends on IOMMU_API + help + For every IOMMU unmap operation, the flush operation of IOTLB and the free + operation of IOVA are deferred. They are only guaranteed to be done before + the related IOVA will be reused. Removing the need to pass in iommu.strict=0 + through command line on ARM64(Now, intel_iommu, amd_iommu, s390_iommu use + lazy mode as deault). If this is enabled, you can still disable with kernel + parameters, such as iommu.strict=1, intel_iommu=strict, amd_iommu=fullflush + or s390_iommu=strict depending on the architecture. + + If unsure, say N here. + config OF_IOMMU def_bool y depends on OF && IOMMU_API diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 33a982e33716369..e307d70d1578b3b 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -43,7 +43,12 @@ #else static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA; #endif + +#ifdef CONFIG_IOMMU_LAZY_MODE +static bool iommu_dma_strict __read_mostly; +#else static bool iommu_dma_strict __read_mostly = true; +#endif struct iommu_callback_data { const struct iommu_ops *ops; -- 1.8.3 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
