forked from luck/tmp_suning_uos_patched
0c3b3171ce
The arm64 codebase to implement coherent dma allocation for architectures with non-coherent DMA is a good start for a generic implementation, given that is uses the generic remap helpers, provides the atomic pool for allocations that can't sleep and still is realtively simple and well tested. Move it to kernel/dma and allow architectures to opt into it using a config symbol. Architectures just need to provide a new arch_dma_prep_coherent helper to writeback an invalidate the caches for any memory that gets remapped for uncached access. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com>
63 lines
853 B
Plaintext
63 lines
853 B
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_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_DIRECT_OPS
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bool
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depends on HAS_DMA
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config DMA_NONCOHERENT_CACHE_SYNC
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bool
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depends on DMA_DIRECT_OPS
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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 DMA_DIRECT_OPS
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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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depends on DMA_DIRECT_OPS
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select DMA_REMAP
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