linux-kernel - Re: [PATCH v2 2/3] MIPS: Loongson: Add DMA support for 7A1000

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Date:   Fri, 27 Mar 2020 14:26:34 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Christoph Hellwig <hch@...radead.org>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>
CC:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH v2 2/3] MIPS: Loongson: Add DMA support for 7A1000



于 2020年3月25日 GMT+08:00 下午9:27:56, Christoph Hellwig <hch@...radead.org> 写到:
>On Mon, Mar 23, 2020 at 10:59:14AM +0800, Tiezhu Yang wrote:
>> Implement __phys_to_dma() and __dma_to_phys() according to the
>> node id offset in the 7A1000 DMA route config register.
>
>Can you please try to just use the dma_pfn_offset field in struct
>device
>for all loongson platforms?  I'm pretty sure I asked for that last time
>around..

Here we have a problem that dma_pfn_offset doesn't fit our platform.

We have multiple dma-ranges that translate in to different address and
dma_pfn_offset can only handle single range 
with fixed offset.

Thanks.

-- 
Jiaxun Yang