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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/arm64/Kconfig | |
| parent | 4e1003aa56a7d60ddb048e43a7a51368fcfe36af (diff) | |
| download | lwn-34dc0ea6bc960f1f57b2148f01a3f4da23f87013.tar.gz lwn-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/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 3f047afb982c..57606307fe34 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -12,7 +12,6 @@ config ARM64 select ARCH_CLOCKSOURCE_DATA select ARCH_HAS_DEBUG_VIRTUAL select ARCH_HAS_DEVMEM_IS_ALLOWED - select ARCH_HAS_DMA_COHERENT_TO_PFN select ARCH_HAS_DMA_PREP_COHERENT select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI select ARCH_HAS_FAST_MULTIPLIER |