linux-kernel - Re: [PATCH v2 5/5] of: address: Always use dma_default

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Date:   Wed, 1 Mar 2023 14:18:10 +0000
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     "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,
        robin.murphy@....com, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 5/5] of: address: Always use dma_default_coherent for
 default coherency



> 2023年3月1日 13:06，Christoph Hellwig <hch@....de> 写道：
> 
>> - select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
> 
> Doesn't powerpc need to select CONFIG_ARCH_DMA_DEFAULT_COHERENT now,
> or even better should be doing that in the patch adding that
> symbol?

If I read the code correctly for powerpc OF_DMA_DEFAULT_COHERENT is only selected
with !NOT_COHERENT_CACHE, which means non-coherent dma support is disabled….

> 
> In fact I wonder if adding CONFIG_ARCH_DMA_DEFAULT_COHERENT and removing
> OF_DMA_DEFAULT_COHERENT should be one patch, as that seems to bring
> over the intent a little better I'd say.