[libre-riscv-dev] GPU Drivers ROCM

[libre-riscv-dev] GPU Drivers ROCM

[Yehowshua]

It recently occurred to me that the entire ROCM stack is open.
ROCM also has, OpenGL, Vulkan, OpenCL, and CUDA -> HIP
frontends.

At the very bottom of ROCM sits llvm which emits AMD GPU opcodes.

It **should be possible to modify this emitter for our GPU. Then we’d virtually
have to do little to no work.

I’m actively investigating if this is possible and am trying to start a conversation
with some ROCM engineers.

Yehowshua
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Re: [libre-riscv-dev] GPU Drivers ROCM

[Luke Kenneth Casson Leighton]

On Saturday, June 6, 2020, Yehowshua <yimmanuel3@gatech.edu> wrote:

> It recently occurred to me that the entire ROCM stack is open.
> ROCM also has, OpenGL, Vulkan, OpenCL, and CUDA -> HIP
> frontends.


 https://github.com/RadeonOpenCompute/ROCm


> At the very bottom of ROCM sits llvm which emits AMD GPU opcodes.


according to the diagram, NVIDIA CUDA GPU opcodes as well


>
> It **should be possible to modify this emitter for our GPU. Then we’d
> virtually
> have to do little to no work.


indeed.

another possibility is to actively support AMDGPU opcodes.

this is the aporoach taken by MIAOW (a subset of).


> I’m actively investigating if this is possible and am trying to start a
> conversation
> with some ROCM engineers.


remember to emphasise to them that we are doing a hybrid CPUGPU.  that the
usual route of a full IPC / RPC mechanism communicating to a foreign remote
architecture is gone, and any complex IPC/RPC inter-kernel bridge code is
entirely gone, replaced with *direct* executed assembly code.

otherwise they will think that the conversation involves us being a
Vivante, or a MALI, and consequently they will think that you are talking
about 10, 20 or greater man-years of work, whereas what you are actually
talking about is of the order of around 1 maybe 2.

l.




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