| Message ID | 20210518064215.2856977-4-tientzu@chromium.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Restricted DMA | expand |
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>
On Tue, May 18, 2021 at 02:42:03PM +0800, Claire Chang wrote:
> Add a new kconfig symbol, DMA_RESTRICTED_POOL, for restricted DMA pool.
Please merge this with the actual code that is getting added.
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
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(+)