Re: [PATCH v11 09/12] swiotlb: Add restricted DMA alloc/free support

On Wed, Jun 16, 2021 at 12:59 PM Christoph Hellwig [off-list ref] wrote:

On Wed, Jun 16, 2021 at 12:04:16PM +0800, Claire Chang wrote:

quoted

Just noticed that after propagating swiotlb_force setting into
io_tlb_default_mem->force, the memory allocation behavior for
swiotlb_force will change (i.e. always skipping arch_dma_alloc and
dma_direct_alloc_from_pool).

Yes, I think we need to split a "use_for_alloc" flag from the force flag.

How about splitting is_dev_swiotlb_force into is_swiotlb_force_bounce
(io_tlb_mem->force_bounce) and is_swiotlb_force_alloc
(io_tlb_mem->force_alloc)?