[PATCH v4 05/14] swiotlb: Add DMA_RESTRICTED_POOL
From: Claire Chang <hidden>
Date: 2021-02-09 06:26:17
Also in:
linux-devicetree, linuxppc-dev, xen-devel
Subsystem:
dma mapping helpers, the rest · Maintainers:
Marek Szyprowski, Linus Torvalds
Add a new kconfig symbol, DMA_RESTRICTED_POOL, for restricted DMA pool. Signed-off-by: Claire Chang <redacted> --- kernel/dma/Kconfig | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 479fc145acfc..97ff9f8dd3c8 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig@@ -83,6 +83,20 @@ config SWIOTLB bool select NEED_DMA_MAP_STATE +config DMA_RESTRICTED_POOL + bool "DMA Restricted Pool" + depends on OF && OF_RESERVED_MEM + select 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
--
2.30.0.478.g8a0d178c01-goog