diff mbox series

[v7,03/15] swiotlb: Add DMA_RESTRICTED_POOL

Message ID 20210518064215.2856977-4-tientzu@chromium.org (mailing list archive)
State New, archived
Headers show
Series Restricted DMA | expand

Commit Message

Claire Chang May 18, 2021, 6:42 a.m. UTC 
Add a new kconfig symbol, DMA_RESTRICTED_POOL, for restricted DMA pool.

Signed-off-by: Claire Chang <tientzu@chromium.org>
---
 kernel/dma/Kconfig | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

Comments

Florian Fainelli May 19, 2021, 7 p.m. UTC | #1 
On 5/17/2021 11:42 PM, Claire Chang wrote:
> Add a new kconfig symbol, DMA_RESTRICTED_POOL, for restricted DMA pool.
> 
> Signed-off-by: Claire Chang <tientzu@chromium.org>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
diff mbox series

Patch

diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 77b405508743..3e961dc39634 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -80,6 +80,20 @@  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