[AMD] Disable DSA fused top-k v2 on ROCm for GLM-5.x / DeepSeek-V3.2 (#30506)

Co-authored-by: kk <43161300+kkHuang-amd@users.noreply.github.com>

python/sglang/srt/server_args.py

@@ -4409,6 +4409,16 @@ class ServerArgs:
 
             run_post_process_pass(self, _deepseek_moe_quant_resolution)
             if is_hip():
+                if is_deepseek_dsa(hf_config):
+                    # The fused top-k v2 kernel (topk_transform_512_v2) is a
+                    # CUDA/Hopper-only path: its JIT source includes
+                    # <cooperative_groups.h> and uses cg::this_cluster()
+                    # (thread-block clusters), neither of which exists on ROCm,
+                    # so it fails to JIT-compile on gfx9xx during CUDA-graph
+                    # capture. DeepSeek-V4 already disables it on HIP; mirror that
+                    # here for the rest of the DSA family (DeepSeek-V3.2 /
+                    # GLM-5.x) that shares the same decode top-k path.
+                    envs.SGLANG_OPT_USE_TOPK_V2.set(False)
                 if not self._resolved().enable_dp_attention and self.nnodes == 1:
                     # TODO (Hubert): Put this back later
                     # self.enable_aiter_allreduce_fusion = True