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[https://nvbugs/6266705][fix] Gate the FlashInfer import-time selection on get_sm_version() == 90 (in… #14973

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[https://nvbugs/6266705][fix] Gate the FlashInfer import-time selection on get_sm_version() == 90 (in… #14973

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8 changes: 7 additions & 1 deletion tensorrt_llm/_torch/modules/mamba/gdn_mixer.py
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Expand Up @@ -12,9 +12,15 @@
from torch import nn
from transformers import Qwen3NextConfig

from tensorrt_llm._utils import get_sm_version

# Default: FlashInfer GDN prefill ON. Set TLLM_USE_FLASHINFER_GDN_PREFILL=0 to
# fall back to the vendored Triton chunk_gated_delta_rule.
if os.getenv("TLLM_USE_FLASHINFER_GDN_PREFILL", "1") == "1":
# The FlashInfer GDN prefill kernel (gdn_prefill_launcher.cu) only supports
# device major version 9 (SM90/Hopper); on other archs it aborts at load. Gate
# the selection on SM90 so non-Hopper GPUs (e.g. Blackwell SM120) use the
# device-agnostic Triton path.
if os.getenv("TLLM_USE_FLASHINFER_GDN_PREFILL", "1") == "1" and get_sm_version() == 90:
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@LarryXFly LarryXFly Jun 5, 2026

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The FlashInfer GDN prefill kernel Requires SM90 (Hopper) or SM100 or SM103 (Blackwell) architecture.

from tensorrt_llm._torch.modules.fla.flashinfer_chunk import chunk_gated_delta_rule
else:
from tensorrt_llm._torch.modules.fla.chunk import chunk_gated_delta_rule
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