From 7a10f6fbfeeae24adc7b8b5fd6cede3bc667426b Mon Sep 17 00:00:00 2001
From: KuangjuX <18630816527@163.com>
Date: Sat, 21 Dec 2024 17:36:28 -0800
Subject: [PATCH] Add G2SCopyV class.

---
 benchmarks/cpp/flashattention/copy.cuh       | 68 ++++++++++++++++++--
 benchmarks/cpp/flashattention/cutlass_fa.cuh |  8 ++-
 2 files changed, 68 insertions(+), 8 deletions(-)

diff --git a/benchmarks/cpp/flashattention/copy.cuh b/benchmarks/cpp/flashattention/copy.cuh
index f153761..ea4793a 100644
--- a/benchmarks/cpp/flashattention/copy.cuh
+++ b/benchmarks/cpp/flashattention/copy.cuh
@@ -2,6 +2,7 @@
 // Licensed under the MIT License.
 
 #pragma once
+#include "cuda_utils.cuh"
 
 #include <cute/tensor.hpp>
 
@@ -11,13 +12,14 @@ namespace cutlass_wrapper {
 using namespace cute;
 
 namespace detail {
+
 template <typename GQTensor, typename SQTensor, typename GKTensor,
           typename SKTensor, typename TiledCopy>
 class G2SCopyQK {
   public:
-    __device__ G2SCopyQK(GQTensor& gQ, SQTensor& sQ, GKTensor& gK, SKTensor& sK,
-                         TiledCopy tiled_copy, int gQ_stride, int sQ_stride,
-                         int gK_stride, int sK_stride, int num_stage = 2)
+    DEVICE G2SCopyQK(GQTensor& gQ, SQTensor& sQ, GKTensor& gK, SKTensor& sK,
+                     TiledCopy tiled_copy, int gQ_stride, int sQ_stride,
+                     int gK_stride, int sK_stride, int num_stage = 2)
         : gQ(gQ),
           sQ(sQ),
           gK(gK),
@@ -29,13 +31,14 @@ class G2SCopyQK {
           cur_iter(0),
           num_stage(num_stage) {}
 
-    inline __device__ void print_q() {
+    // For debugging purpose.
+    DEVICE void print_gQ() {
         if (thread0()) {
             print(gQ), print("\n");
         }
     }
 
-    inline __device__ void prologue() {
+    DEVICE void prologue() {
         // Pipeline the copy operation.
 #pragma unroll
         for (int m = 0; m < size<1>(gQ); ++m) {
@@ -74,14 +77,44 @@ class G2SCopyQK {
     SQTensor& sQ;
     GKTensor& gK;
     SKTensor& sK;
-
     TiledCopy tiled_copy;
-
     int gQ_stride;
     int sQ_stride;
     int gK_stride;
     int sK_stride;
+    int cur_iter;
+    int num_stage;
+};
+
+template <typename GVTensor, typename SVTensor, typename TiledCopy>
+class G2SCopyV {
+  public:
+    DEVICE G2SCopyV(GVTensor& gV, SVTensor& sV, TiledCopy tiled_copy,
+                    int gV_stride, int sV_stride, int num_stage = 2)
+        : gV(gV),
+          sV(sV),
+          gV_stride(gV_stride),
+          sV_stride(sV_stride),
+          cur_iter(0),
+          num_stage(num_stage) {}
+
+    // For debugging purpose.
+    DEVICE void print_gV() {
+        if (thread0()) {
+            print(gV), print("\n");
+        }
+    }
+
+    DEVICE void prologue() {
+        // Pipeline the copy operation.
+    }
 
+  private:
+    GVTensor& gV;
+    SVTensor& sV;
+    TiledCopy tiled_copy;
+    int gV_stride;
+    int sV_stride;
     int cur_iter;
     int num_stage;
 };
@@ -117,6 +150,27 @@ inline __device__ auto make_g2s_qk(const Element* gQ_ptr, Element* sQ_ptr,
     return copy_qk;
 }
 
+template <typename Element, typename GlobalVLayout, typename SharedVLayout,
+          typename TiledCopy>
+DEVICE auto make_g2s_v(const Element* gV_ptr, Element* sV_ptr, int gV_stride,
+                       int sV_stride) {
+    int tid = threadIdx.x;
+
+    auto gV = make_tensor(make_gmem_ptr(gV_ptr), GlobalVLayout{});
+    auto sV = make_tensor(make_smem_ptr(sV_ptr), SharedVLayout{});
+
+    TiledCopy tiled_copy;
+
+    auto loader = tiled_copy.get_thread_slice(tid);
+
+    auto gVs = loader.partition_S(gV);
+    auto sVs = loader.partition_D(sV);
+
+    detail::G2SCopyV copy_v(gVs, sVs, tiled_copy, gV_stride, sV_stride);
+
+    return copy_v;
+}
+
 // template <class G2STiledCopy, class GTensor, class STensor>
 // class G2SCopyTile {
 //   public:
diff --git a/benchmarks/cpp/flashattention/cutlass_fa.cuh b/benchmarks/cpp/flashattention/cutlass_fa.cuh
index 4d5bfb9..2e37057 100644
--- a/benchmarks/cpp/flashattention/cutlass_fa.cuh
+++ b/benchmarks/cpp/flashattention/cutlass_fa.cuh
@@ -130,7 +130,13 @@ __global__ void __launch_bounds__(Nthreads)
         typename KeTraits::TiledCopyG2S>(Q, sQ_ptr, K, sK_ptr, kK, kTK, kK,
                                          kTK);
 
-    g2s_copy_qk.print_q();
+    auto g2s_copy_v =
+        make_g2s_v<Element, typename KeTraits::GmemLayoutV,
+                   typename KeTraits::SmemLayoutV,
+                   typename KeTraits::TiledCopyG2S>(V, sV_ptr, kN, kTN);
+
+    g2s_copy_qk.print_gQ();
+    g2s_copy_v.print_gV();
 }
 
 }  // namespace cutlass_wrapper