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SubjectRe: [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 <> 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
>for all loongson platforms? I'm pretty sure I asked for that last time

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.


Jiaxun Yang

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