Loading arch/arm64/Kconfig +31 −26 Original line number Diff line number Diff line Loading @@ -221,32 +221,6 @@ config NEED_SG_DMA_LENGTH config SMP def_bool y config ARM64_DMA_USE_IOMMU bool select ARM_HAS_SG_CHAIN select NEED_SG_DMA_LENGTH if ARM64_DMA_USE_IOMMU config ARM64_DMA_IOMMU_ALIGNMENT int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers" range 4 9 default 8 help DMA mapping framework by default aligns all buffers to the smallest PAGE_SIZE order which is greater than or equal to the requested buffer size. This works well for buffers up to a few hundreds kilobytes, but for larger buffers it just a waste of address space. Drivers which has relatively small addressing window (like 64Mib) might run out of virtual space with just a few allocations. With this parameter you can specify the maximum PAGE_SIZE order for DMA IOMMU buffers. Larger buffers will be aligned only to this specified order. The order is expressed as a power of two multiplied by the PAGE_SIZE. endif config SWIOTLB def_bool y Loading Loading @@ -688,6 +662,37 @@ config ARCH_HAS_CACHE_LINE_SIZE source "mm/Kconfig" config ARM64_DMA_USE_IOMMU bool "ARM64 DMA iommu integration" select ARM_HAS_SG_CHAIN select NEED_SG_DMA_LENGTH help Enable using iommu through the standard dma apis. dma_alloc_coherent() will allocate scatter-gather memory which is made virtually contiguous via iommu. Enable if system contains IOMMU hardware. if ARM64_DMA_USE_IOMMU config ARM64_DMA_IOMMU_ALIGNMENT int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers" range 4 9 default 8 help DMA mapping framework by default aligns all buffers to the smallest PAGE_SIZE order which is greater than or equal to the requested buffer size. This works well for buffers up to a few hundreds kilobytes, but for larger buffers it just a waste of address space. Drivers which has relatively small addressing window (like 64Mib) might run out of virtual space with just a few allocations. With this parameter you can specify the maximum PAGE_SIZE order for DMA IOMMU buffers. Larger buffers will be aligned only to this specified order. The order is expressed as a power of two multiplied by the PAGE_SIZE. endif config SECCOMP bool "Enable seccomp to safely compute untrusted bytecode" ---help--- Loading Loading
arch/arm64/Kconfig +31 −26 Original line number Diff line number Diff line Loading @@ -221,32 +221,6 @@ config NEED_SG_DMA_LENGTH config SMP def_bool y config ARM64_DMA_USE_IOMMU bool select ARM_HAS_SG_CHAIN select NEED_SG_DMA_LENGTH if ARM64_DMA_USE_IOMMU config ARM64_DMA_IOMMU_ALIGNMENT int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers" range 4 9 default 8 help DMA mapping framework by default aligns all buffers to the smallest PAGE_SIZE order which is greater than or equal to the requested buffer size. This works well for buffers up to a few hundreds kilobytes, but for larger buffers it just a waste of address space. Drivers which has relatively small addressing window (like 64Mib) might run out of virtual space with just a few allocations. With this parameter you can specify the maximum PAGE_SIZE order for DMA IOMMU buffers. Larger buffers will be aligned only to this specified order. The order is expressed as a power of two multiplied by the PAGE_SIZE. endif config SWIOTLB def_bool y Loading Loading @@ -688,6 +662,37 @@ config ARCH_HAS_CACHE_LINE_SIZE source "mm/Kconfig" config ARM64_DMA_USE_IOMMU bool "ARM64 DMA iommu integration" select ARM_HAS_SG_CHAIN select NEED_SG_DMA_LENGTH help Enable using iommu through the standard dma apis. dma_alloc_coherent() will allocate scatter-gather memory which is made virtually contiguous via iommu. Enable if system contains IOMMU hardware. if ARM64_DMA_USE_IOMMU config ARM64_DMA_IOMMU_ALIGNMENT int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers" range 4 9 default 8 help DMA mapping framework by default aligns all buffers to the smallest PAGE_SIZE order which is greater than or equal to the requested buffer size. This works well for buffers up to a few hundreds kilobytes, but for larger buffers it just a waste of address space. Drivers which has relatively small addressing window (like 64Mib) might run out of virtual space with just a few allocations. With this parameter you can specify the maximum PAGE_SIZE order for DMA IOMMU buffers. Larger buffers will be aligned only to this specified order. The order is expressed as a power of two multiplied by the PAGE_SIZE. endif config SECCOMP bool "Enable seccomp to safely compute untrusted bytecode" ---help--- Loading
