linux-kernel - Re: [PATCH 5/5] PCI: remove PCI_DMA_BUS_IS

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Date:   Tue, 24 Apr 2018 11:23:16 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     Christoph Hellwig <hch@....de>
CC:     iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
        linux-block@...r.kernel.org, linux-ide@...r.kernel.org,
        linux-scsi@...r.kernel.org, netdev@...r.kernel.org,
        davem@...emloft.net, linux-kernel@...r.kernel.org
Subject:     Re: [PATCH 5/5] PCI: remove PCI_DMA_BUS_IS_PHYS

On Tue, 24 Apr 2018 11:16:25 PDT (-0700), Christoph Hellwig wrote:
> This was used by the ide, scsi and networking code in the past to
> determine if they should bounce payloads.  Now that the dma mapping
> always have to support dma to all physical memory (thanks to swiotlb
> for non-iommu systems) there is no need to this crude hack any more.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
> [...]
> diff --git a/arch/riscv/include/asm/pci.h b/arch/riscv/include/asm/pci.h
> index 0f2fc9ef20fc..b3638c505728 100644
> --- a/arch/riscv/include/asm/pci.h
> +++ b/arch/riscv/include/asm/pci.h
> @@ -26,9 +26,6 @@
>  /* RISC-V shim does not initialize PCI bus */
>  #define pcibios_assign_all_busses() 1
>
> -/* We do not have an IOMMU */
> -#define PCI_DMA_BUS_IS_PHYS 1
> -
>  extern int isa_dma_bridge_buggy;
>
>  #ifdef CONFIG_PCI

Thanks!

Acked-by: Palmer Dabbelt <palmer@...ive.com> (For the RISC-V change)