linux-kernel - Re: consolidate direct dma mapping and swiotlb support

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Message-ID: <23fee3bb-61ce-1735-b264-3acc0109c858@arm.com>
Date:   Fri, 29 Dec 2017 10:52:14 +0000
From:   Vladimir Murzin <vladimir.murzin@....com>
To:     Christoph Hellwig <hch@....de>, iommu@...ts.linux-foundation.org
Cc:     linux-mips@...ux-mips.org, linux-ia64@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        Guan Xuetao <gxt@...c.pku.edu.cn>, linux-arch@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-c6x-dev@...ux-c6x.org,
        linux-hexagon@...r.kernel.org, x86@...nel.org,
        linux-snps-arc@...ts.infradead.org,
        adi-buildroot-devel@...ts.sourceforge.net,
        linux-m68k@...ts.linux-m68k.org, patches@...ups.riscv.org,
        linux-metag@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Michal Simek <monstr@...str.eu>, linux-parisc@...r.kernel.org,
        linux-cris-kernel@...s.com, linux-kernel@...r.kernel.org,
        linux-alpha@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: consolidate direct dma mapping and swiotlb support

On 29/12/17 08:18, Christoph Hellwig wrote:
> Almost every architecture supports a direct dma mapping implementation,
> where no iommu is used and the device dma address is a 1:1 mapping to
> the physical address or has a simple linear offset.  Currently the
> code for this implementation is most duplicated over the architectures,
> and the duplicated again in the swiotlb code, and then duplicated again
> for special cases like the x86 memory encryption DMA ops.
> 
> This series takes the existing very simple dma-noop dma mapping
> implementation, enhances it with all the x86 features and quirks, and
> creates a common set of architecture hooks for it and the swiotlb code.
> 
> It then switches a large number of architectures to this generic
> direct map implement and the new generic swiotlb dma_map ops.
> 
> Note that for now this only handles architectures that do cache coherent
> DMA, but a similar consolidation for non-coherent architectures is in the
> work for later merge windows.

Is it available in your dma-mapping.git or somewhere else?

Cheers
Vladimir

> 
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> linux-arm-kernel@...ts.infradead.org
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> 

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