95 lines
2.1 KiB
Plaintext
95 lines
2.1 KiB
Plaintext
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config HAS_DMA
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bool
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depends on !NO_DMA
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default y
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config NEED_SG_DMA_LENGTH
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bool
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config NEED_DMA_MAP_STATE
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bool
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config ARCH_DMA_ADDR_T_64BIT
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def_bool 64BIT || PHYS_ADDR_T_64BIT
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config ARCH_HAS_DMA_COHERENCE_H
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bool
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config HAVE_GENERIC_DMA_COHERENT
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bool
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config ARCH_HAS_SETUP_DMA_OPS
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bool
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config ARCH_HAS_SYNC_DMA_FOR_DEVICE
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bool
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config ARCH_HAS_SYNC_DMA_FOR_CPU
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bool
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select NEED_DMA_MAP_STATE
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config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
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bool
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config ARCH_HAS_DMA_COHERENT_TO_PFN
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bool
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config ARCH_HAS_DMA_MMAP_PGPROT
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bool
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config DMA_NONCOHERENT_CACHE_SYNC
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bool
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config DMA_VIRT_OPS
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bool
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depends on HAS_DMA
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config SWIOTLB
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bool
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select NEED_DMA_MAP_STATE
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config DMA_REMAP
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depends on MMU
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bool
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config DMA_DIRECT_REMAP
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bool
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select DMA_REMAP
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config DMA_API_DEBUG
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bool "Enable debugging of DMA-API usage"
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select NEED_DMA_MAP_STATE
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help
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Enable this option to debug the use of the DMA API by device drivers.
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With this option you will be able to detect common bugs in device
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drivers like double-freeing of DMA mappings or freeing mappings that
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were never allocated.
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This also attempts to catch cases where a page owned by DMA is
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accessed by the cpu in a way that could cause data corruption. For
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example, this enables cow_user_page() to check that the source page is
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not undergoing DMA.
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This option causes a performance degradation. Use only if you want to
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debug device drivers and dma interactions.
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If unsure, say N.
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config DMA_API_DEBUG_SG
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bool "Debug DMA scatter-gather usage"
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default y
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depends on DMA_API_DEBUG
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help
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Perform extra checking that callers of dma_map_sg() have respected the
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appropriate segment length/boundary limits for the given device when
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preparing DMA scatterlists.
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This is particularly likely to have been overlooked in cases where the
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dma_map_sg() API is used for general bulk mapping of pages rather than
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preparing literal scatter-gather descriptors, where there is a risk of
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unexpected behaviour from DMA API implementations if the scatterlist
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is technically out-of-spec.
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If unsure, say N.
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