Tune a8w8_blockscale_bpreshuffle_tuned_gemm for gfx942(MI308X)

[chuanbowang2026]

• Tune a8w8_blockscale_bpreshuffle_tuned_gemm for gfx942 (MI308X)
• Update tuned/untuned CSV configs
• Update tuner splitK behavior for ASM
• Ran tuner and checked output CSV format."

[chuanbowang2026]

Addressed, removed redundant local definitions and imported from aiter.jit.core directly.

[valarLip]

@chuanbowang2026 please resolve the failed ci

[chuanbowang2026]

Addressed CI lint failures from black and ruff in gemm_a8w8_blockscale_bpreshuffle_tune.py.

Changes in this update:

• Added file-level # ruff: noqa: E402 to allow intentional import ordering (we modify sys.path before module imports).
• Removed unused local variables reported by Ruff (F841) in tune().
• Cleaned up comment style and removed stale commented-out lines.
• Applied Black formatting only.

No functional tuning logic was changed; this is a lint/format cleanup to pass CI.

[yzhou103]

aiter/csrc/ck_gemm_a8w8_blockscale_bpreshuffle/gen_instances.py should be updated, you refer to gen_instances.py in ck_gemm_a88_bpreshuffle

we should filter asm solutions out when generating ck lookup file.

[chuanbowang2026]

Thank you, it has been completed:
Set asm_kernel_id to start from 0 in gemm_a8w8_blockscale_bpreshuffle_tune.py.
In gen_instances.py, filter tuned results with libtype == "ck" before building the CK lookup table, so ASM solutions are excluded from CK lookup generation.

[amd-ruitang3]

Hi @chuanbowang2026 , I commit "add_mi355_tuned"

[valarLip]

let's split config to per model csv

[chuanbowang2026]

Split DSV3 blockscale bpreshuffle tuned/untuned configs into cu80 and cu256 variants, and updated tuning/codegen to auto-select the machine-specific config by CU count. Because the previously tuned results were concatenated, the untuned results were run separately, resulting in a timeout of 1 hour.

[chuanbowang2026]

This CI timeout issue has also been observed by others. One suspicion is that MAX_JOBS is set too low for forked PRs, which may cause longer runtimes on some GPUs.
Huang, Xin is currently verifying this.

The merge-base changed after approval.

[chuanbowang2026]

This PR is no longer needed due to history issues. Please submit it now and transfer it to #2366 To prevent data loss, this PR will be closed after the new PR is completed.