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| author | Christoph Hellwig <hch@lst.de> | 2019-10-29 11:01:37 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-11-11 10:52:15 +0100 |
| commit | 34dc0ea6bc960f1f57b2148f01a3f4da23f87013 (patch) | |
| tree | f6d10010989435562d0ece0971ed992febe6c26c /arch/arm/Kconfig | |
| parent | dma-direct: remove the dma_handle argument to __dma_direct_alloc_pages (diff) | |
| download | linux-34dc0ea6bc960f1f57b2148f01a3f4da23f87013.tar.xz linux-34dc0ea6bc960f1f57b2148f01a3f4da23f87013.zip | |
dma-direct: provide mmap and get_sgtable method overrides
For dma-direct we know that the DMA address is an encoding of the
physical address that we can trivially decode. Use that fact to
provide implementations that do not need the arch_dma_coherent_to_pfn
architecture hook. Note that we still can only support mmap of
non-coherent memory only if the architecture provides a way to set an
uncached bit in the page tables. This must be true for architectures
that use the generic remap helpers, but other architectures can also
manually select it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 8a50efb559f3..80e795aacd3a 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -7,7 +7,6 @@ config ARM select ARCH_HAS_BINFMT_FLAT select ARCH_HAS_DEBUG_VIRTUAL if MMU select ARCH_HAS_DEVMEM_IS_ALLOWED - select ARCH_HAS_DMA_COHERENT_TO_PFN if SWIOTLB select ARCH_HAS_DMA_WRITE_COMBINE if !ARM_DMA_MEM_BUFFERABLE select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_FORTIFY_SOURCE |