[AMD] Perf Kimi-K3 MoE optimization (#33838)

Co-authored-by: wunhuang <wunhuang@amd.com>

test/registered/unit/layers/quantization/test_mxfp4_situ_output.py

@@ -0,0 +1,112 @@
+import sys
+from types import SimpleNamespace
+from unittest.mock import patch
+
+import pytest
+import torch
+
+from sglang.srt.layers import zero_copy_context
+from sglang.srt.layers.moe.token_dispatcher.standard import StandardDispatchOutput
+from sglang.srt.layers.moe.topk import StandardTopKOutput
+from sglang.test.ci.ci_register import register_amd_ci
+
+register_amd_ci(est_time=5, stage="stage-b", runner_config="1-gpu-small-amd")
+
+pytestmark = pytest.mark.skipif(not torch.cuda.is_available(), reason="requires a GPU")
+
+
+def test_situ_routed_moe_returns_published_output_buffer():
+    from sglang.srt.layers.moe import route_quant_handoff
+    from sglang.srt.layers.quantization import mxfp4 as mxfp4_module
+    from sglang.srt.layers.quantization.mxfp4 import Mxfp4MoEMethod
+
+    tokens, hidden, top_k = 3, 128, 2
+    x = torch.randn(tokens, hidden, dtype=torch.bfloat16, device="cuda")
+    x_quant = torch.zeros(tokens, hidden, dtype=torch.uint8, device="cuda")
+    x_scale = torch.zeros(tokens, hidden // 32, dtype=torch.uint8, device="cuda")
+    packed_topk = torch.zeros(tokens, top_k, dtype=torch.int32, device="cuda")
+    topk_output = StandardTopKOutput(
+        topk_weights=torch.full(
+            (tokens, top_k), 0.5, dtype=torch.float32, device="cuda"
+        ),
+        topk_ids=torch.zeros(tokens, top_k, dtype=torch.int32, device="cuda"),
+        router_logits=torch.empty(tokens, 0, dtype=torch.float32, device="cuda"),
+    )
+    dispatch_output = StandardDispatchOutput(
+        hidden_states=x,
+        hidden_states_scale=None,
+        topk_output=topk_output,
+    )
+
+    method = Mxfp4MoEMethod.__new__(Mxfp4MoEMethod)
+    method.use_deep_gemm = False
+    method.use_marlin = False
+    method.use_flashinfer = True
+    method._fi_kernel = None
+    method.flashinfer_mxfp4_moe_precision = "default"
+    method.hidden_size = hidden
+    method.intermediate_size_per_partition = 128
+    method.moe_runner_config = SimpleNamespace(activation="situ")
+
+    dummy = torch.empty(1, dtype=torch.uint8, device="cuda")
+    layer = SimpleNamespace(
+        moe_ep_rank=0,
+        num_local_experts=1,
+        num_experts=1,
+        w13_weight=dummy,
+        w13_weight_scale=dummy,
+        gemm1_alpha=None,
+        gemm1_clamp_limit=None,
+        w2_weight=dummy,
+        w2_weight_scale=dummy,
+    )
+    expected = (
+        torch.arange(tokens * hidden, dtype=torch.float32, device="cuda")
+        .reshape(tokens, hidden)
+        .to(torch.bfloat16)
+    )
+    returned_ptr = None
+
+    def fake_routed_moe(**kwargs):
+        nonlocal returned_ptr
+        kwargs["output"].copy_(expected)
+        ffi_result = kwargs["output"].clone()
+        returned_ptr = ffi_result.data_ptr()
+        return ffi_result
+
+    latent = torch.empty_like(x)
+    with (
+        patch.object(
+            route_quant_handoff,
+            "take",
+            return_value=(packed_topk, x_quant, x_scale),
+        ),
+        patch(
+            "sglang.srt.layers.quantization.mxfp4.trtllm_fp4_block_scale_routed_moe",
+            side_effect=fake_routed_moe,
+            create=True,
+        ),
+        patch.object(
+            mxfp4_module,
+            "RoutingMethodType",
+            SimpleNamespace(TopK=SimpleNamespace(value=0)),
+            create=True,
+        ),
+        patch.object(
+            mxfp4_module,
+            "ActivationType",
+            SimpleNamespace(Situ=SimpleNamespace(value=0)),
+            create=True,
+        ),
+        zero_copy_context.set_moe_output(latent),
+    ):
+        combine_input = method.apply(layer, dispatch_output)
+
+    assert returned_ptr is not None
+    assert returned_ptr != latent.data_ptr()
+    assert combine_input.hidden_states.data_ptr() == latent.data_ptr()
+    torch.testing.assert_close(combine_input.hidden_states, expected, rtol=0, atol=0)
+
+
+if __name__ == "__main__":
+    sys.exit(pytest.main([__file__, "-v"]))

test/registered/unit/layers/quantization/test_mxfp4_situ_weight_layout.py

@@ -0,0 +1,37 @@
+import sys
+
+import pytest
+
+from sglang.test.ci.ci_register import register_amd_ci
+
+register_amd_ci(est_time=5, stage="stage-b", runner_config="1-gpu-small-amd")
+
+
+@pytest.mark.parametrize(
+    ("a8w4", "a4w4", "expected"),
+    [
+        (None, None, True),
+        ("0", "1", False),
+        ("1", "0", True),
+        ("1", "1", True),
+    ],
+)
+def test_aiter_situ_weight_layout_matches_activation_mode_precedence(
+    monkeypatch, a8w4, a4w4, expected
+):
+    from sglang.srt.layers.quantization.mxfp4 import (
+        _aiter_situ_uses_gu_interleaved_weights,
+    )
+
+    monkeypatch.delenv("AITER_SITUV2_A8W4", raising=False)
+    monkeypatch.delenv("AITER_SITUV2_A4W4", raising=False)
+    if a8w4 is not None:
+        monkeypatch.setenv("AITER_SITUV2_A8W4", a8w4)
+    if a4w4 is not None:
+        monkeypatch.setenv("AITER_SITUV2_A4W4", a4w4)
+
+    assert _aiter_situ_uses_gu_interleaved_weights() is expected
+
+
+if __name__ == "__main__":
+    sys.exit(pytest.main([__file__, "-v"]))