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RISC-V Linux Port
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Any plan for upstreaming DMA32? #151

Open dayeol opened 5 years ago

dayeol commented 5 years ago

Hi, @terpstra

I'm currently trying to submit a patch for adding contiguous memory allocator (CMA) to RISC-V linux. I've already wrote some bit of code and tested it:

https://github.com/dayeol/riscv-linux/commit/16941d1d604abb33a43d7ced5836b4a5b374e295

I believe this should be implemented in arch/riscv/mm/dma.c in order to be migrated with architecture's dma allocators such as dma_alloc_coherent.

But I found that the file only exists in riscv-linux-4.15 branch, and has not been upstreamed yet. Do you have any plans to upstream dma.c?

Can you let me know how and where can I submit this patch, or if I'm missing something?

Thank you in advance!

terpstra commented 5 years ago

Hi! I'm not the risc-v linux port maintainer.

@palmer-dabbelt @nvpw What do you think?

palmer-dabbelt commented 5 years ago

You can submit the patch to linux-riscv@lists.infradead.org, based on Linus' latest master. There aren't any concrete plans for anyone at SiFive to do this, but it is necessary to enable a large set of devices so it'll have to get done at some point. If you're happy doing it that would be great, our development is all upstream now so that's the best way to get involved.