linux-kernel - Re: [PATCH 6/6] MIPS: remove CONFIG_DMA_PERDEV

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Date:   Tue, 9 Feb 2021 09:36:16 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 6/6] MIPS: remove CONFIG_DMA_PERDEV_COHERENT

Reviewed-by: Huacai Chen <chenhuacai@...nel.org>

On Mon, Feb 8, 2021 at 10:51 PM Christoph Hellwig <hch@....de> wrote:
>
> Just select DMA_NONCOHERENT and ARCH_HAS_SETUP_DMA_OPS from the
> MIPS_GENERIC platform instead.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/mips/Kconfig              | 8 ++------
>  arch/mips/mm/dma-noncoherent.c | 2 +-
>  2 files changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 1f1603a08a6d2d..fae02b0b9c599a 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -123,6 +123,7 @@ choice
>
>  config MIPS_GENERIC_KERNEL
>         bool "Generic board-agnostic MIPS kernel"
> +       select ARCH_HAS_SETUP_DMA_OPS
>         select MIPS_GENERIC
>         select BOOT_RAW
>         select BUILTIN_DTB
> @@ -132,7 +133,7 @@ config MIPS_GENERIC_KERNEL
>         select CPU_MIPSR2_IRQ_EI
>         select CPU_MIPSR2_IRQ_VI
>         select CSRC_R4K
> -       select DMA_PERDEV_COHERENT
> +       select DMA_NONCOHERENT
>         select HAVE_PCI
>         select IRQ_MIPS_CPU
>         select MIPS_AUTO_PFN_OFFSET
> @@ -1127,11 +1128,6 @@ config FW_CFE
>  config ARCH_SUPPORTS_UPROBES
>         bool
>
> -config DMA_PERDEV_COHERENT
> -       bool
> -       select ARCH_HAS_SETUP_DMA_OPS
> -       select DMA_NONCOHERENT
> -
>  config DMA_NONCOHERENT
>         bool
>         #
> diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c
> index 90b562753eb892..212f3ce75a6bd3 100644
> --- a/arch/mips/mm/dma-noncoherent.c
> +++ b/arch/mips/mm/dma-noncoherent.c
> @@ -135,7 +135,7 @@ void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
>  }
>  #endif
>
> -#ifdef CONFIG_DMA_PERDEV_COHERENT
> +#ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS
>  void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
>                 const struct iommu_ops *iommu, bool coherent)
>  {
> --
> 2.29.2
>