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/*! \file
    \brief Unit test for the PipelineTmaAsync class
*/


#define KERNEL_DBG_TRACE false

#include "../common/cutlass_unit_test.h"
#include <thrust/host_vector.h>
#include <thrust/device_vector.h>

#include <cute/tensor.hpp>
#include <cute/arch/cluster_sm90.hpp>

#include <cutlass/util/reference/host/gemm.h>
#include <cutlass/cluster_launch.hpp>

#include "cutlass/core_io.h"

#include "cutlass/util/print_error.hpp"
#include "cutlass/util/GPU_Clock.hpp"

#include "testbed.h"
#include "cutlass/pipeline/pipeline.hpp"
#include "cutlass/arch/barrier.h"
#include "cute/arch/cluster_sm90.hpp"

using namespace cute;

//////////////////// KERNEL /////////////////////////

template <uint32_t Stages>
struct SharedStorage
{
  typename cutlass::PipelineTmaAsync<Stages>::SharedStorage storage;
};

// Goal of this kernel is to complete deadlock-free
template <class ClusterShape, uint32_t NumStages>
__global__ static
void pipeline_device(uint32_t const NumIterations)
{

  extern __shared__ char shared_memory[];
  using MainloopPipeline = cutlass::PipelineTmaAsync<NumStages>;
  using PipelineState = cutlass::PipelineState<NumStages>;

  using SharedStorage = SharedStorage<NumStages>;
  SharedStorage& shared_storage = *reinterpret_cast<SharedStorage*>(shared_memory);

  [[maybe_unused]] auto cta_layout = Layout<ClusterShape>{}; // (m,n) -> cta_id
  int warp_idx = __shfl_sync(0xffffffff, threadIdx.x / 32, 0);
  int warp_group_thread_idx = threadIdx.x % 128;
  dim3 block_id_in_cluster = cute::block_id_in_cluster();

  auto cluster_shape = ClusterShape{};

  // #Producers = #RowsInCluster + #ColsInCluster - 1
  uint32_t const NumProducers = cute::size<0>(cluster_shape) + cute::size<1>(cluster_shape) - 1;
  uint32_t const TmaTransactionBytes = sizeof(uint32_t) * NumProducers;
  uint32_t const per_cta_bytes = sizeof(uint32_t);

  // mbarrier.init
  typename MainloopPipeline::Params params;
  params.transaction_bytes = TmaTransactionBytes;
  params.role = MainloopPipeline::ThreadCategory::ProducerConsumer;
  params.is_leader = warp_group_thread_idx == 0;
  params.num_consumers = 128;

  MainloopPipeline pipeline(shared_storage.storage, params, cluster_shape);

  __syncthreads();

  // Ensure All CTAs in Cluster have completed init before issuing commits
  cute::cluster_arrive_relaxed();
  cute::cluster_wait();

  // Total number of gemm_k_iterations
  auto mma_k_iterations  = NumIterations;
  auto tma_k_iterations  = NumIterations;

  PipelineState smem_pipe_read;
  // For the DMA (prologue) - we start with an opposite phase - since we skip all waits
  // i.e., we know that the buffer is indeed empty
  PipelineState smem_pipe_write = cutlass::make_producer_start_state<MainloopPipeline>();
  PipelineState smem_pipe_release;
  int K_TILE_MMAS = 1;

  int lane_predicate = cute::elect_one_sync();
  int k_pipe_tma_prologue = min(NumStages, tma_k_iterations);

  // DMA Prologue (Loads)
  CUTLASS_PRAGMA_UNROLL
  for(int i = 0; i < k_pipe_tma_prologue; ++i) {
    pipeline.producer_acquire(smem_pipe_write);
    // cp.async.bulk.tensor would typically happen here
    pipeline.producer_commit(smem_pipe_write, per_cta_bytes);
    ++smem_pipe_write;
  }
  tma_k_iterations -= k_pipe_tma_prologue;

  // MMA Prologue (Compute) - modeling inflight MMAs
  for (int iter = 0; iter < K_TILE_MMAS; ++iter)
  {
    pipeline.consumer_wait(smem_pipe_read);
    warpgroup_arrive();
    // GMMA would typically happen here

    ++smem_pipe_read;
  }

  mma_k_iterations -= K_TILE_MMAS;

  CUTLASS_PRAGMA_NO_UNROLL
  for (int iter = 0; iter < mma_k_iterations; ++iter)
  {
    pipeline.consumer_wait(smem_pipe_read);

    warpgroup_arrive();
    // GMMA would typically happen here

    pipeline.consumer_release(smem_pipe_release);

    if (lane_predicate && (warp_idx == 0) && (tma_k_iterations > 0)) {
      pipeline.producer_acquire(smem_pipe_write);
      // cp.async.bulk.tensor would typically happen here
      pipeline.producer_commit(smem_pipe_write, per_cta_bytes);
      ++smem_pipe_write;
      --tma_k_iterations;
    }

    // next read stage
    ++smem_pipe_read;
    ++smem_pipe_release;
  }

  // To make sure remote SMEM doesn't get destoryed
  cute::cluster_arrive();
  cute::cluster_wait();
}
/////////////////////////////////////////////////////

/// Device NT GMMA + TMA specialized
template<uint32_t Stages_, typename ClusterShape_>
struct PipelineTest {

  //
  // Data members
  //
  static constexpr uint32_t Stages = Stages_;
  static constexpr uint32_t kBlockSize = 128;
  using ClusterShape = ClusterShape_;

  //
  // Methods
  //

  // Ctor
  PipelineTest(){};


  // Run CuTe GEMM kernel
  cudaError_t run(uint32_t const kNumIters,
                  cudaStream_t stream = 0) {

    float elapsed_ms = 0.0f;
    // Pipeline (multistage pipeline)
    [[maybe_unused]] auto num_stages = Int<Stages>{};

    auto cluster_shape = Shape<Int<ClusterShape::kM>, Int<ClusterShape::kN>, _1>{};

    //
    // Configure and launch
    //
    int iterations = 1;
    cudaEvent_t events[2];
    cudaError_t result;

    for (cudaEvent_t & event : events) {
      result = cudaEventCreate(&event);
      if (result != cudaSuccess) {
        std::cerr << "Error: Failed to create event.";
        return result;
      }
    }

    result = cudaEventRecord(events[0]);

    if (result != cudaSuccess) {
      std::cerr << "Error: Failed to record start event.";
      return result;
    }

    for (int iter = 0; iter < iterations; ++iter) {
      int smem_size = int(sizeof(SharedStorage<Stages>));

      result = cudaFuncSetAttribute(
        pipeline_device<decltype(cluster_shape), Stages>,
        cudaFuncAttributeMaxDynamicSharedMemorySize,
        smem_size);

      // Launch a single Cluster, with 128 thread per CTA
      dim3 dimCluster(size<0>(cluster_shape), size<1>(cluster_shape), 1);
      dim3 dimGrid(size<0>(cluster_shape), size<1>(cluster_shape), 1);
      dim3 dimBlock(kBlockSize,1,1);

      const void* kernel = (const void*)pipeline_device<decltype(cluster_shape), Stages>;
      int iters = kNumIters;
      void* kernel_params[] = {reinterpret_cast<void*>(&iters)};
      cutlass::ClusterLauncher::launch(dimGrid, dimCluster, dimBlock, smem_size, stream, kernel, kernel_params);

    } // profiling loop ends

    result = cudaEventRecord(events[1]);

    if (result != cudaSuccess) {
      std::cerr << "Error: Failed to record stop event.";
      return result;
    }

    result = cudaDeviceSynchronize();

    if (result != cudaSuccess) {
      std::cerr << "Error: cudaDeviceSynchronize() failed" << std::endl;
      return result;
    }

    result = cudaEventElapsedTime(&elapsed_ms, events[0], events[1]);

    if (result != cudaSuccess) {
      std::cerr << "Failed to create event.";
      return result;
    }

    for (cudaEvent_t & event : events) {
      (void)cudaEventDestroy(event);
    }

    return cudaSuccess;
  }
};

#if CUDA_12_0_SM90_FEATURES_SUPPORTED
TEST(SM90_Verify_PipelineTmaAsync, Cluster1x1_Stage2) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<1, 1, 1>;
  static constexpr uint32_t Stages = 2;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster1x1_Stage5) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<1, 1, 1>;
  static constexpr uint32_t Stages = 5;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster1x1_Stage10) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<1, 1, 1>;
  static constexpr uint32_t Stages = 10;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster2x2_Stage2) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<2, 2, 1>;
  static constexpr uint32_t Stages = 2;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster2x2_Stage5) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<2, 2, 1>;
  static constexpr uint32_t Stages = 5;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster2x2_Stage10) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<2, 2, 1>;
  static constexpr uint32_t Stages = 10;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster4x4_Stage2) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<4, 4, 1>;
  static constexpr uint32_t Stages = 2;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster4x4_Stage10) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<4, 4, 1>;
  static constexpr uint32_t Stages = 10;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster1x2_Stage2) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<1, 2, 1>;
  static constexpr uint32_t Stages = 2;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster1x2_Stage7) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<1, 2, 1>;
  static constexpr uint32_t Stages = 7;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster1x2_Stage10) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<1, 2, 1>;
  static constexpr uint32_t Stages = 10;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster2x1_Stage2) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<2, 1, 1>;
  static constexpr uint32_t Stages = 2;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster2x1_Stage7) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<2, 1, 1>;
  static constexpr uint32_t Stages = 7;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster4x1_Stage2) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<4, 1, 1>;
  static constexpr uint32_t Stages = 2;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster4x1_Stage7) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<4, 1, 1>;
  static constexpr uint32_t Stages = 7;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster1x4_Stage2) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<1, 4, 1>;
  static constexpr uint32_t Stages = 2;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster1x4_Stage7) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<1, 4, 1>;
  static constexpr uint32_t Stages = 7;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster2x4_Stage2) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<2, 4, 1>;
  static constexpr uint32_t Stages = 2;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster2x4_Stage7) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<2, 4, 1>;
  static constexpr uint32_t Stages = 7;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster4x2_Stage2) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<4, 2, 1>;
  static constexpr uint32_t Stages = 2;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}

TEST(SM90_Verify_PipelineTmaAsync, Cluster4x2_Stage7) {
  Options options;
  using ClusterShape = cutlass::gemm::GemmShape<4, 2, 1>;
  static constexpr uint32_t Stages = 7;
  using Test = PipelineTest<Stages, ClusterShape>;
  Testbed<Test> testbed(options);
  EXPECT_TRUE(testbed.verification());
}
#endif