diff options
Diffstat (limited to 'kernel/dma/Kconfig')
| -rw-r--r-- | kernel/dma/Kconfig | 136 |
1 files changed, 102 insertions, 34 deletions
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig index 1da3f44f2565..31cfdb6b4bc3 100644 --- a/kernel/dma/Kconfig +++ b/kernel/dma/Kconfig @@ -1,10 +1,31 @@ # SPDX-License-Identifier: GPL-2.0-only +config NO_DMA + bool + config HAS_DMA bool depends on !NO_DMA default y +config DMA_OPS_HELPERS + bool + +# +# IOMMU drivers that can bypass the IOMMU code and optionally use the direct +# mapping fast path should select this option and set the dma_ops_bypass +# flag in struct device where applicable +# +config DMA_OPS_BYPASS + bool + +# Lets platform IOMMU driver choose between bypass and IOMMU +config ARCH_HAS_DMA_MAP_DIRECT + bool + +config NEED_SG_DMA_FLAGS + bool + config NEED_SG_DMA_LENGTH bool @@ -14,21 +35,24 @@ config NEED_DMA_MAP_STATE config ARCH_DMA_ADDR_T_64BIT def_bool 64BIT || PHYS_ADDR_T_64BIT -config ARCH_HAS_DMA_COHERENCE_H - bool - config ARCH_HAS_DMA_SET_MASK bool # # Select this option if the architecture needs special handling for # DMA_ATTR_WRITE_COMBINE. Normally the "uncached" mapping should be what -# people thing of when saying write combine, so very few platforms should +# people think of when saying write combine, so very few platforms should # need to enable this. # config ARCH_HAS_DMA_WRITE_COMBINE bool +# +# Select if the architectures provides the arch_dma_mark_clean hook +# +config ARCH_HAS_DMA_MARK_CLEAN + bool + config DMA_DECLARE_COHERENT bool @@ -54,17 +78,52 @@ config ARCH_HAS_DMA_PREP_COHERENT config ARCH_HAS_FORCE_DMA_UNENCRYPTED bool -config DMA_NONCOHERENT_CACHE_SYNC - bool - -config DMA_VIRT_OPS +# +# Select this option if the architecture assumes DMA devices are coherent +# by default. +# +config ARCH_DMA_DEFAULT_COHERENT bool - depends on HAS_DMA config SWIOTLB bool select NEED_DMA_MAP_STATE +config SWIOTLB_DYNAMIC + bool "Dynamic allocation of DMA bounce buffers" + default n + depends on SWIOTLB + help + This enables dynamic resizing of the software IO TLB. The kernel + starts with one memory pool at boot and it will allocate additional + pools as needed. To reduce run-time kernel memory requirements, you + may have to specify a smaller size of the initial pool using + "swiotlb=" on the kernel command line. + + If unsure, say N. + +config DMA_BOUNCE_UNALIGNED_KMALLOC + bool + depends on SWIOTLB + +config DMA_NEED_SYNC + def_bool ARCH_HAS_SYNC_DMA_FOR_DEVICE || ARCH_HAS_SYNC_DMA_FOR_CPU || \ + ARCH_HAS_SYNC_DMA_FOR_CPU_ALL || DMA_API_DEBUG || \ + ARCH_HAS_DMA_OPS || SWIOTLB + +config DMA_RESTRICTED_POOL + bool "DMA Restricted Pool" + depends on OF && OF_RESERVED_MEM && SWIOTLB + help + This enables support for restricted DMA pools which provide a level of + DMA memory protection on systems with limited hardware protection + capabilities, such as those lacking an IOMMU. + + For more information see + <Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt> + and <kernel/dma/swiotlb.c>. + If unsure, say "n". + # # Should be selected if we can mmap non-coherent mappings to userspace. # The only thing that is really required is a way to set an uncached bit @@ -78,15 +137,25 @@ config DMA_COHERENT_POOL select GENERIC_ALLOCATOR bool -config DMA_REMAP +config DMA_GLOBAL_POOL + select DMA_DECLARE_COHERENT + depends on !ARCH_HAS_DMA_SET_UNCACHED + depends on !DMA_DIRECT_REMAP bool - depends on MMU - select DMA_NONCOHERENT_MMAP config DMA_DIRECT_REMAP bool - select DMA_REMAP select DMA_COHERENT_POOL + select DMA_NONCOHERENT_MMAP + +# +# Fallback to arch code for DMA allocations. This should eventually go away. +# +config ARCH_HAS_DMA_ALLOC + depends on !ARCH_HAS_DMA_SET_UNCACHED + depends on !DMA_DIRECT_REMAP + depends on !DMA_GLOBAL_POOL + bool config DMA_CMA bool "DMA Contiguous Memory Allocator" @@ -99,10 +168,22 @@ config DMA_CMA You can disable CMA by specifying "cma=0" on the kernel's command line. - For more information see <include/linux/dma-contiguous.h>. + For more information see <kernel/dma/contiguous.c>. If unsure, say "n". if DMA_CMA + +config DMA_NUMA_CMA + bool "Enable separate DMA Contiguous Memory Area for NUMA Node" + depends on NUMA + help + Enable this option to get numa CMA areas so that NUMA devices + can get local memory by DMA coherent APIs. + + You can set the size of pernuma CMA by specifying "cma_pernuma=size" + or set the node id and its size of CMA by specifying "numa_cma= + <node>:size[,<node>:size]" on the kernel's command line. + comment "Default contiguous memory area size:" config CMA_SIZE_MBYTES @@ -147,7 +228,7 @@ endchoice config CMA_ALIGNMENT int "Maximum PAGE_SIZE order of alignment for contiguous buffers" - range 4 12 + range 2 12 default 8 help DMA mapping framework by default aligns all buffers to the smallest @@ -174,29 +255,16 @@ config DMA_API_DEBUG drivers like double-freeing of DMA mappings or freeing mappings that were never allocated. - This also attempts to catch cases where a page owned by DMA is - accessed by the cpu in a way that could cause data corruption. For - example, this enables cow_user_page() to check that the source page is - not undergoing DMA. - This option causes a performance degradation. Use only if you want to debug device drivers and dma interactions. If unsure, say N. -config DMA_API_DEBUG_SG - bool "Debug DMA scatter-gather usage" - default y - depends on DMA_API_DEBUG +config DMA_MAP_BENCHMARK + bool "Enable benchmarking of streaming DMA mapping" + depends on DEBUG_FS help - Perform extra checking that callers of dma_map_sg() have respected the - appropriate segment length/boundary limits for the given device when - preparing DMA scatterlists. + Provides /sys/kernel/debug/dma_map_benchmark that helps with testing + performance of dma_(un)map_page. - This is particularly likely to have been overlooked in cases where the - dma_map_sg() API is used for general bulk mapping of pages rather than - preparing literal scatter-gather descriptors, where there is a risk of - unexpected behaviour from DMA API implementations if the scatterlist - is technically out-of-spec. - - If unsure, say N. + See tools/testing/selftests/dma/dma_map_benchmark.c |