swiotlb: Add restricted DMA pool initialization

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Add the initialization function to create restricted DMA pools from
matching reserved-memory nodes.

Regardless of swiotlb setting, the restricted DMA pool is preferred if
available.

The restricted DMA pools provide a basic level of protection against the
DMA overwriting buffer contents at unexpected times. However, to protect
against general data leakage and system memory corruption, the system
needs to provide a way to lock down the memory access, e.g., MPU.

Signed-off-by: Claire Chang <tientzu@chromium.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Stefano Stabellini <sstabellini@kernel.org>
Tested-by: Will Deacon <will@kernel.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

...

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Claire Chang 2021-06-19 11:40:41 +08:00 • committed by Konrad Rzeszutek Wilk

parent f4111e39a5

commit 0b84e4f8b7

3 changed files with 92 additions and 1 deletions

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3

include/linux/swiotlb.h

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14

kernel/dma/Kconfig

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76

kernel/dma/swiotlb.c

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