linux-kernel - Re: [PATCH 0/7] MIPS DMA coherence fixes

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Message-Id: <34578218-DC7A-4C8B-A01A-AD64831CCB43@flygoat.com>
Date:   Tue, 21 Feb 2023 19:55:05 +0000
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Christoph Hellwig <hch@....de>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        mpe@...erman.id.au, paul.walmsley@...ive.com, palmer@...belt.com,
        Rob Herring <robh+dt@...nel.org>, m.szyprowski@...sung.com
Subject: Re: [PATCH 0/7] MIPS DMA coherence fixes



> 2023年2月21日 19:46，Robin Murphy <robin.murphy@....com> 写道：
> 
> On 2023-02-21 18:15, Jiaxun Yang wrote:
>>> 2023年2月21日 17:54，Christoph Hellwig <hch@....de> 写道：
>>> 
>>> Can you explain the motivation here?  Also why riscv patches are at
>>> the end of a mips fіxes series?
>> Ah sorry for any confusion.
>> So the main purpose of this patch is to fix MIPS’s broken per-device coherency.
>> To be more precise, we want to be able to control the default coherency for all devices probed from
>> devicetree in early boot code.
> 
> Including the patch which actually does that would be helpful. As it is, patches 4-7 here just appear to be moving an option around for no practical effect.

Well the affect is default coherency of devicetree probed devices are now following dma_default_coherent
instead of a static Kconfig option. For MIPS platform, dma_default_coherent will be determined by boot code.

Thanks
- Jiaxun