Server : Apache System : Linux server2.corals.io 4.18.0-348.2.1.el8_5.x86_64 #1 SMP Mon Nov 15 09:17:08 EST 2021 x86_64 User : corals ( 1002) PHP Version : 7.4.33 Disable Function : exec,passthru,shell_exec,system Directory : /usr/src/kernels/4.18.0-348.2.1.el8_5.x86_64/kernel/dma/ |
config HAS_DMA bool depends on !NO_DMA default y # # 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 config DMA_OPS bool config NEED_SG_DMA_LENGTH bool config NEED_DMA_MAP_STATE bool 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 # need to enable this. # config ARCH_HAS_DMA_WRITE_COMBINE bool config HAVE_GENERIC_DMA_COHERENT bool config ARCH_HAS_SETUP_DMA_OPS bool config ARCH_HAS_SYNC_DMA_FOR_DEVICE bool config ARCH_HAS_SYNC_DMA_FOR_CPU bool select NEED_DMA_MAP_STATE config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL bool config ARCH_HAS_DMA_PREP_COHERENT bool config ARCH_HAS_FORCE_DMA_UNENCRYPTED bool config DMA_NONCOHERENT_CACHE_SYNC bool config DMA_VIRT_OPS bool depends on HAS_DMA select DMA_OPS config SWIOTLB bool select NEED_DMA_MAP_STATE # # 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 # in the pagetables # config DMA_NONCOHERENT_MMAP default y if !MMU bool config DMA_COHERENT_POOL select GENERIC_ALLOCATOR bool config DMA_REMAP bool depends on MMU select DMA_NONCOHERENT_MMAP config DMA_DIRECT_REMAP bool select DMA_REMAP select DMA_COHERENT_POOL config DMA_API_DEBUG bool "Enable debugging of DMA-API usage" select NEED_DMA_MAP_STATE help Enable this option to debug the use of the DMA API by device drivers. With this option you will be able to detect common bugs in device drivers like double-freeing of DMA mappings or freeing mappings that were never allocated. 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 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.