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 <redacted>

Looks good,

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