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authorChristoph Hellwig <hch@lst.de>2019-06-03 09:43:51 +0300
committerChristoph Hellwig <hch@lst.de>2019-06-03 17:00:08 +0300
commitc30700db9eaabb35e0b123301df35a6846e6b6b4 (patch)
tree96e4e6018c0b6e92289aee5093082c6322ab7abf /arch/Kconfig
parent67f30ad19c4b329dbe47e1563b2017203bd02e34 (diff)
downloadlinux-c30700db9eaabb35e0b123301df35a6846e6b6b4.tar.xz
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/Kconfig8
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