linux-kernel - Re: [PATCH 2/3] riscv: Implement Zicbom-based cache management operations

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Date:   Thu, 9 Jun 2022 20:22:15 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Heiko Stuebner <heiko@...ech.de>, palmer@...belt.com,
        paul.walmsley@...ive.com
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        wefu@...hat.com, guoren@...nel.org, cmuellner@...ux.com,
        philipp.tomsich@...ll.eu, hch@....de, samuel@...lland.org,
        atishp@...shpatra.org, anup@...infault.org, mick@....forth.gr,
        robh+dt@...nel.org, krzk+dt@...nel.org, devicetree@...r.kernel.org,
        drew@...gleboard.org, Atish Patra <atish.patra@....com>
Subject: Re: [PATCH 2/3] riscv: Implement Zicbom-based cache management
 operations



On 6/9/22 17:43, Heiko Stuebner wrote:
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 32ffef9f6e5b..384d0c15f2b6 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -376,6 +376,21 @@ config RISCV_ISA_SVPBMT
>  
>  	   If you don't know what to do here, say Y.
>  
> +config RISCV_ISA_ZICBOM
> +	bool "Zicbom extension support for non-coherent dma operation"
> +	select ARCH_HAS_DMA_PREP_COHERENT
> +	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
> +	select ARCH_HAS_SYNC_DMA_FOR_CPU
> +	select ARCH_HAS_SETUP_DMA_OPS
> +	select DMA_DIRECT_REMAP
> +	select RISCV_ALTERNATIVE

Since RISCV_ALTERNATIVE depends on !XIP_KERNEL and since 'select' does not
follow any dependency chains, this config also needs to depend on
!XIP_KERNEL.

> +	default y
> +	help
> +	   Adds support to dynamically detect the presence of the ZICBOM extension
> +	   (Cache Block Management Operations) and enable its usage.
> +
> +	   If you don't know what to do here, say Y.

-- 
~Randy