ROCm: sgl-kernel enablement starting with sgl_moe_align_block (#3287)

docker/Dockerfile.rocm

@@ -28,6 +28,9 @@ RUN git clone ${SGL_REPO} \
          echo "Using ${SGL_BRANCH} branch."; \
          git checkout ${SGL_BRANCH}; \
        fi \
+    && cd sgl-kernel \
+    && python setup_rocm.py install \
+    && cd .. \
     && if [ "$BUILD_TYPE" = "srt" ]; then \
          python -m pip --no-cache-dir install -e "python[srt_hip]"; \
        else \

docs/start/install.md

@@ -32,7 +32,9 @@ git clone -b v0.4.2.post1 https://github.com/sgl-project/sglang.git
 cd sglang
 
 pip install --upgrade pip
-pip install sgl-kernel --force-reinstall --no-deps
+cd sgl-kernel
+python setup_rocm.py install
+cd ..
 pip install -e "python[all_hip]"
 ```
 

python/pyproject.toml

@@ -31,7 +31,7 @@ srt = [
 
 # HIP (Heterogeneous-computing Interface for Portability) for AMD
 # => base docker rocm/vllm-dev:20241022, not from public vllm whl
-srt_hip = ["sglang[runtime_common]", "torch", "vllm==0.6.7.dev2", "outlines==0.1.11"]
+srt_hip = ["sglang[runtime_common]", "torch", "vllm==0.6.7.dev2", "outlines==0.1.11", "sgl-kernel>=0.0.3.post1"]
 # xpu is not enabled in public vllm and torch whl,
 # need to follow https://docs.vllm.ai/en/latest/getting_started/xpu-installation.htmlinstall vllm
 srt_xpu = ["sglang[runtime_common]", "outlines>=0.0.44,<0.1.0"]

python/sglang/srt/layers/moe/fused_moe_triton/fused_moe.py

@@ -15,18 +15,10 @@
 
 from sglang.srt.layers.moe.topk import select_experts
 from sglang.srt.layers.quantization.fp8_kernel import per_token_group_quant_fp8
-from sglang.srt.utils import (
-    direct_register_custom_op,
-    get_device_name,
-    is_cuda_available,
-    is_hip,
-)
+from sglang.srt.utils import direct_register_custom_op, get_device_name, is_hip
 
-is_cuda = is_cuda_available()
 is_hip_flag = is_hip()
-if is_cuda:
-    from sgl_kernel import moe_align_block_size as sgl_moe_align_block_size
-
+from sgl_kernel import moe_align_block_size as sgl_moe_align_block_size
 
 logger = logging.getLogger(__name__)
 padding_size = 128 if bool(int(os.getenv("MOE_PADDING", "0"))) else 0
@@ -415,7 +407,7 @@ def moe_align_block_size(
     )
     num_tokens_post_pad = torch.empty((1), dtype=torch.int32, device=topk_ids.device)
     if num_experts >= 224:
-        if enable_moe_align_block_size_triton or is_hip_flag:
+        if enable_moe_align_block_size_triton:
             moe_align_block_size_triton(
                 topk_ids,
                 num_experts,

sgl-kernel/setup_rocm.py

@@ -0,0 +1,92 @@
+# Copyright 2025 SGLang Team. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+
+import multiprocessing
+import os
+import sys
+from pathlib import Path
+
+import torch
+from setuptools import find_packages, setup
+from torch.utils.cpp_extension import BuildExtension, CUDAExtension
+
+root = Path(__file__).parent.resolve()
+
+if "bdist_wheel" in sys.argv and "--plat-name" not in sys.argv:
+    sys.argv.extend(["--plat-name", "manylinux2014_x86_64"])
+
+
+def _get_version():
+    with open(root / "pyproject.toml") as f:
+        for line in f:
+            if line.startswith("version"):
+                return line.split("=")[1].strip().strip('"')
+
+
+operator_namespace = "sgl_kernels"
+include_dirs = [
+    root / "src" / "sgl-kernel" / "include",
+    root / "src" / "sgl-kernel" / "csrc",
+]
+
+sources = [
+    "src/sgl-kernel/torch_extension_rocm.cc",
+    "src/sgl-kernel/csrc/moe_align_kernel.cu",
+]
+
+cxx_flags = ["-O3"]
+libraries = ["hiprtc", "amdhip64", "c10", "torch", "torch_python"]
+extra_link_args = ["-Wl,-rpath,$ORIGIN/../../torch/lib", "-L/usr/lib/x86_64-linux-gnu"]
+
+hipcc_flags = [
+    "-DNDEBUG",
+    f"-DOPERATOR_NAMESPACE={operator_namespace}",
+    "-O3",
+    "-Xcompiler",
+    "-fPIC",
+    "-std=c++17",
+    "-D__HIP_PLATFORM_AMD__=1",
+    "--amdgpu-target=gfx942",
+    "-DENABLE_BF16",
+    "-DENABLE_FP8",
+]
+
+setup(
+    name="sgl-kernel",
+    version=_get_version(),
+    packages=find_packages(),
+    package_dir={"": "src"},
+    ext_modules=[
+        CUDAExtension(
+            name="sgl_kernel.ops._kernels",
+            sources=sources,
+            include_dirs=include_dirs,
+            extra_compile_args={
+                "nvcc": hipcc_flags,
+                "cxx": cxx_flags,
+            },
+            libraries=libraries,
+            extra_link_args=extra_link_args,
+            py_limited_api=True,
+        ),
+    ],
+    cmdclass={
+        "build_ext": BuildExtension.with_options(
+            use_ninja=True, max_jobs=multiprocessing.cpu_count()
+        )
+    },
+    options={"bdist_wheel": {"py_limited_api": "cp39"}},
+    install_requires=["torch"],
+)

sgl-kernel/src/sgl-kernel/torch_extension_rocm.cc

@@ -0,0 +1,29 @@
+/* Copyright 2025 SGLang Team. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include <ATen/core/dispatch/Dispatcher.h>
+#include <torch/library.h>
+
+#include "sgl_kernels_ops.h"
+
+TORCH_LIBRARY_EXPAND(sgl_kernels, m) {
+  // moe_align_block_size
+  m.def(
+      "moe_align_block_size(Tensor topk_ids, int num_experts, int block_size, Tensor! sorted_token_ids, Tensor! "
+      "experts_ids, Tensor! num_tokens_post_pad, Tensor! token_cnts_buffer, Tensor! cumsum_buffer) -> ()");
+  m.impl("moe_align_block_size", torch::kCUDA, &moe_align_block_size);
+}
+
+REGISTER_EXTENSION(_kernels)