[sgl-kernel] 1/N Refactor sglang cutlass 3x - gemm fp8 blockwise sm90 (#8913)

Co-authored-by: luoyuan.luo <luoyuan.luo@antgroup.com>

sgl-kernel/csrc/cutlass_extensions/gemm/dispatch_policy.hpp

@@ -0,0 +1,38 @@
+// Adapted from https://github.com/vllm-project/vllm/blob/main/csrc/cutlass_extensions/gemm/dispatch_policy.hpp
+
+#pragma once
+
+#include "cutlass/gemm/dispatch_policy.hpp"
+
+namespace cutlass::gemm {
+
+//////////////////////////////////////////////////////////////////////////////
+
+// FP8 related policies (including Blocked Scaled Accumulation)
+//  `ScaleGranularityM` specifies scaling granularity along M, while zero-value
+//  `ScaleGranularityM` indicates that scaling granularity is
+//  `size<0>(TileShape_MNK{})` along M.
+template <int ScaleGranularityM = 0>
+struct KernelTmaWarpSpecializedCooperativeFP8BlockScaledSubGroupMAccum : KernelTmaWarpSpecializedCooperative {};
+
+// n-buffer in smem (Hopper TMA), pipelined with Hopper GMMA and TMA, Warp
+// specialized dynamic schedule For FP8 kernels with Block Scaling
+template <
+    int Stages_,
+    class ClusterShape_ = Shape<_1, _1, _1>,
+    class KernelSchedule = KernelTmaWarpSpecialized,
+    int ScaleGranularityM = 0  // `ScaleGranularityM` specifies scaling granularity along M,
+                               // while zero-value `ScaleGranularityM` indicates that scaling
+                               // granularity is `size<0>(TileShape_MNK{})` along M.
+    >
+struct MainloopSm90TmaGmmaWarpSpecializedBlockScalingSubGroupMFP8
+    : MainloopSm90TmaGmmaWarpSpecialized<Stages_, ClusterShape_, KernelSchedule> {
+  static_assert(
+      cute::
+          is_same_v<KernelSchedule, KernelTmaWarpSpecializedCooperativeFP8BlockScaledSubGroupMAccum<ScaleGranularityM>>,
+      "KernelSchedule must be one of the warp specialized policies");
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+}  // namespace cutlass::gemm