Merge branch 'stable/for-linus-5.15' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-2.6-microblaze.git] / kernel / dma / Kconfig

diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 725cfd5..1b02179 100644 (file)
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -80,6 +80,19 @@ config SWIOTLB
        bool
        select NEED_DMA_MAP_STATE
 
+config DMA_RESTRICTED_POOL
+       bool "DMA Restricted Pool"
+       depends on OF && OF_RESERVED_MEM && SWIOTLB
+       help
+         This enables support for restricted DMA pools which provide a level of
+         DMA memory protection on systems with limited hardware protection
+         capabilities, such as those lacking an IOMMU.
+
+         For more information see
+         <Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt>
+         and <kernel/dma/swiotlb.c>.
+         If unsure, say "n".
+
 #
 # Should be selected if we can mmap non-coherent mappings to userspace.
 # The only thing that is really required is a way to set an uncached bit