Migration to ORC JIT for llvmpipe to run on RISC-V

[Jose Fonseca]

My reading of https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17801 also is that adding a meson option is indeed the only thing required to get this going.

I don't know if the submitter, Alex Fan, is or plans to work on the MR, nor anyone else.  From what you described, I think the best way is for you to comment on the MR, offer to help, and get it done if Alex isn't working on it, or does not reply.

Jose

________________________________
From: mesa-dev <mesa-dev-bounces at lists.freedesktop.org> on behalf of abel.bernabeu at gmail.com <abel.bernabeu at gmail.com>
Sent: Wednesday, March 1, 2023 16:10
To: mesa-dev at lists.freedesktop.org <mesa-dev at lists.freedesktop.org>
Subject: Migration to ORC JIT for llvmpipe to run on RISC-V

!! External Email
Dear mesa developers,

I am trying to run mesa with llvmpipe on a RISC-V platform, without success. This is needed in order to get some performance figures for the RISC-V Graphics SIG.

By default llvmpipe is using MCJIT and crashes on lp_build_create_jit_compiler_for_module because MCJit does not support RISC-V.

Seems like MCJIT is deprecated and it is not going to accept new architectures, so llvmpipe will never run on RISC-V unless ported to ORC JIT. I see there is already a merge request for migrating llvmpipe from the deprecated MCJIT to the new ORC JIT:

https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17801<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Fmesa%2Fmesa%2F-%2Fmerge_requests%2F17801&data=05%7C01%7Cjfonseca%40vmware.com%7C32d436bd9c7d4f82a89708db1a6f9283%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C1%7C638132838743751755%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Vcua8DKHtnF0tyL%2Fc9YnY2zivGQCS%2F%2F0z%2BEphdUXoLU%3D&reserved=0>

My understanding is that the code is good for merging in a disabled state (rather than enabled by default). However the merge is gated by the fact that a meson build option is still missing.

Do the mesa developers need help with this? I could try to add the missing option myself if that helps, as this task is critical for supporting basic graphics on RISC-V. Let me know what RISC-V can do to help.

Regards.

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