linux-kernel - Re: [PATCH v2 4/5] riscv: Select ARCH_DMA_DEFAULT

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Date:   Thu, 23 Feb 2023 22:20:27 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, tsbogend@...ha.franken.de,
        mpe@...erman.id.au, paul.walmsley@...ive.com, palmer@...belt.com,
        robh+dt@...nel.org, hch@....de, m.szyprowski@...sung.com,
        robin.murphy@....com, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 4/5] riscv: Select ARCH_DMA_DEFAULT_COHERENT

On Thu, Feb 23, 2023 at 11:36:43AM +0000, Jiaxun Yang wrote:
> For riscv our assumption is unless a device states it is non-coherent,
> we take it to be DMA coherent.
> 
> Select ARCH_DMA_DEFAULT_COHERENT to ensure dma_default_coherent
> is always initialized to true.
> 
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
>  arch/riscv/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 1d46a268ce16..b71ce992c0c0 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -233,6 +233,7 @@ config LOCKDEP_SUPPORT
>  
>  config RISCV_DMA_NONCOHERENT
>  	bool
> +	select ARCH_DMA_DEFAULT_COHERENT

Since we are always coherent by default, I feel like you should put this
in the main "config RISCV" section, where OF_DMA_DEFAULT_COHERENT
currently is, no?

Wouldn't bother respinning for that unless the dma folk have comments
for you.

>  	select ARCH_HAS_DMA_PREP_COHERENT
>  	select ARCH_HAS_SETUP_DMA_OPS
>  	select ARCH_HAS_SYNC_DMA_FOR_CPU
> -- 
> 2.37.1 (Apple Git-137.1)
> 

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