[PATCH v12 09/12] swiotlb: Add restricted DMA alloc/free support

[Christoph Hellwig]

On Wed, Jun 16, 2021 at 02:21:54PM +0800, Claire Chang wrote:
> Add the functions, swiotlb_{alloc,free} and is_swiotlb_for_alloc to
> support the memory allocation from restricted DMA pool.
> 
> The restricted DMA pool is preferred if available.
> 
> Note that since coherent allocation needs remapping, one must set up
> another device coherent pool by shared-dma-pool and use
> dma_alloc_from_dev_coherent instead for atomic coherent allocation.
> 
> Signed-off-by: Claire Chang <tientzu at chromium.org>

Looks good,

Reviewed-by: Christoph Hellwig <hch at lst.de>