linux-kernel - Re: clean up and modularize arch dma

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Message-ID: <162d7932-5766-4c29-5471-07d1b699190a@oracle.com>
Date:   Wed, 21 Jun 2017 12:24:28 -0700
From:   tndave <tushar.n.dave@...cle.com>
To:     Christoph Hellwig <hch@....de>, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        xen-devel@...ts.xenproject.org, linux-c6x-dev@...ux-c6x.org,
        linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-mips@...ux-mips.org, openrisc@...ts.librecores.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, dmaengine@...r.kernel.org,
        linux-tegra@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-samsung-soc@...r.kernel.org,
        iommu@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: clean up and modularize arch dma_mapping interface V2



On 06/16/2017 11:10 AM, Christoph Hellwig wrote:
> Hi all,
> 
> for a while we have a generic implementation of the dma mapping routines
> that call into per-arch or per-device operations.  But right now there
> still are various bits in the interfaces where don't clearly operate
> on these ops.  This series tries to clean up a lot of those (but not all
> yet, but the series is big enough).  It gets rid of the DMA_ERROR_CODE
> way of signaling failures of the mapping routines from the
> implementations to the generic code (and cleans up various drivers that
> were incorrectly using it), and gets rid of the ->set_dma_mask routine
> in favor of relying on the ->dma_capable method that can be used in
> the same way, but which requires less code duplication.
Chris,

Thanks for doing this.
So archs can still have their own definition for dma_set_mask() if 
HAVE_ARCH_DMA_SET_MASK is y?
(and similarly for dma_set_coherent_mask() when 
CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK is y)
Any plan to change these?

I'm in a process of making some changes to SPARC iommu so it would be 
good to know. Thanks.

-Tushar

> 
> I've got a good number of reviews last time, but a few are still missing.
> I'd love to not have to re-spam everyone with this patchbomb, so early
> ACKs (or complaints) are welcome.
> 
> I plan to create a new dma-mapping tree to collect all this work.
> Any volunteers for co-maintainers, especially from the iommu gang?
> 
> The whole series is also available in git:
> 
>      git://git.infradead.org/users/hch/misc.git dma-map
> 
> Gitweb:
> 
>      http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma-map
> 
> Changes since V1:
>   - remove two lines of code from arm dmabounce
>   - a few commit message tweaks
>   - lots of ACKs
>