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

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Message-ID: <20210616045918.GA27537@lst.de>
Date:   Wed, 16 Jun 2021 06:59:18 +0200
From:   Christoph Hellwig <hch@....de>
To:     Claire Chang <tientzu@...omium.org>
Cc:     Rob Herring <robh+dt@...nel.org>, mpe@...erman.id.au,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
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Subject: Re: [PATCH v11 09/12] swiotlb: Add restricted DMA alloc/free
 support

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