Re: [PATCH 4/6] MIPS: Loongson: Add DMA support for 7A1000

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To: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
Subject: Re: [PATCH 4/6] MIPS: Loongson: Add DMA support for 7A1000
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Fri, 13 Mar 2020 01:24:51 -0700
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, Huacai Chen <chenhc@xxxxxxxxxx>, Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, linux-mips@xxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, linux-ide@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Xuefeng Li <lixuefeng@xxxxxxxxxxx>
In-reply-to: <1583742206-29163-5-git-send-email-yangtiezhu@loongson.cn>
References: <1583742206-29163-1-git-send-email-yangtiezhu@loongson.cn> <1583742206-29163-5-git-send-email-yangtiezhu@loongson.cn>

On Mon, Mar 09, 2020 at 04:23:24PM +0800, Tiezhu Yang wrote:
> Implement __phys_to_dma() and __dma_to_phys() according to the
> node id offset in 7A1000 DMA route config register.

Can you just switch Loongson over to use the dma_pfn_offset field in
struct device?  I'd love to kill the __phys_to_dma and __dma_to_phys
hooks wherever possible.

Follow-Ups:
- Re: [PATCH 4/6] MIPS: Loongson: Add DMA support for 7A1000
  - From: Tiezhu Yang

References:
- [PATCH 0/6] Add basic support for Loongson 7A1000 bridge chip
  - From: Tiezhu Yang
- [PATCH 4/6] MIPS: Loongson: Add DMA support for 7A1000
  - From: Tiezhu Yang

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