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

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Date:   Fri, 13 Mar 2020 01:24:51 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jens Axboe <axboe@...nel.dk>, linux-mips@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-ide@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH 4/6] MIPS: Loongson: Add DMA support for 7A1000

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.