diff options
Diffstat (limited to 'kernel/dma/Kconfig')
| -rw-r--r-- | kernel/dma/Kconfig | 101 |
1 files changed, 68 insertions, 33 deletions
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig index 479fc145acfc..31cfdb6b4bc3 100644 --- a/kernel/dma/Kconfig +++ b/kernel/dma/Kconfig @@ -8,8 +8,7 @@ config HAS_DMA depends on !NO_DMA default y -config DMA_OPS - depends on HAS_DMA +config DMA_OPS_HELPERS bool # @@ -24,6 +23,9 @@ config DMA_OPS_BYPASS config ARCH_HAS_DMA_MAP_DIRECT bool +config NEED_SG_DMA_FLAGS + bool + config NEED_SG_DMA_LENGTH bool @@ -33,16 +35,13 @@ 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 @@ -79,10 +78,52 @@ config ARCH_HAS_DMA_PREP_COHERENT config ARCH_HAS_FORCE_DMA_UNENCRYPTED bool +# +# Select this option if the architecture assumes DMA devices are coherent +# by default. +# +config ARCH_DMA_DEFAULT_COHERENT + bool + 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 @@ -96,15 +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" @@ -122,15 +173,16 @@ config DMA_CMA if DMA_CMA -config DMA_PERNUMA_CMA - bool "Enable separate DMA Contiguous Memory Area for each NUMA Node" - default NUMA && ARM64 +config DMA_NUMA_CMA + bool "Enable separate DMA Contiguous Memory Area for NUMA Node" + depends on NUMA help - Enable this option to get pernuma CMA areas so that devices like - ARM64 SMMU can get local memory by DMA coherent APIs. + 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" - on the kernel's command line. + 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:" @@ -208,23 +260,6 @@ config DMA_API_DEBUG If unsure, say N. -config DMA_API_DEBUG_SG - bool "Debug DMA scatter-gather usage" - default y - depends on DMA_API_DEBUG - 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. - - 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. - config DMA_MAP_BENCHMARK bool "Enable benchmarking of streaming DMA mapping" depends on DEBUG_FS |