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config HAS_DMA
bool
depends on !NO_DMA
default y
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 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_COHERENT_TO_PFN
bool
config ARCH_HAS_DMA_MMAP_PGPROT
bool
config DMA_NONCOHERENT_CACHE_SYNC
bool
config DMA_VIRT_OPS
bool
depends on HAS_DMA
config SWIOTLB
bool
select NEED_DMA_MAP_STATE
config DMA_REMAP
depends on MMU
bool
config DMA_DIRECT_REMAP
bool
select DMA_REMAP
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 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
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.
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