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| author |   Christoph Hellwig <hch@lst.de> | 2019-06-03 08:43:51 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-06-03 16:00:08 +0200 |
| commit | c30700db9eaabb35e0b123301df35a6846e6b6b4 (patch) | |
| tree | 96e4e6018c0b6e92289aee5093082c6322ab7abf /arch/Kconfig | |
| parent | au1100fb: fix DMA API abuse (diff) | |
| download | wireguard-linux-c30700db9eaabb35e0b123301df35a6846e6b6b4.tar.xz wireguard-linux-c30700db9eaabb35e0b123301df35a6846e6b6b4.zip | |
dma-direct: provide generic support for uncached kernel segments
A few architectures support uncached kernel segments. In that case we get
an uncached mapping for a given physica address by using an offset in the
uncached segement. Implement support for this scheme in the generic
dma-direct code instead of duplicating it in arch hooks.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'arch/Kconfig')
| -rw-r--r-- | arch/Kconfig | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index c47b328eada0..e8d19c3cb91f 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -260,6 +260,14 @@ config ARCH_HAS_SET_MEMORY config ARCH_HAS_SET_DIRECT_MAP bool +# +# Select if arch has an uncached kernel segment and provides the +# uncached_kernel_address / cached_kernel_address symbols to use it +# +config ARCH_HAS_UNCACHED_SEGMENT + select ARCH_HAS_DMA_PREP_COHERENT + bool + # Select if arch init_task must go in the __init_task_data section config ARCH_TASK_STRUCT_ON_STACK bool |