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Composable Kernel: /home/docs/checkouts/readthedocs.org/user_builds/advanced-micro-devices-composable-kernel/checkouts/develop/include/ck_tile/ops/rmsnorm2d/kernel/rmsnorm2d_fwd_kernel.hpp Source File
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 // SPDX-License-Identifier: MIT
 // Copyright (c) 2018-2025, Advanced Micro Devices, Inc. All rights reserved.
  
 #pragma once
  
 #include "ck_tile/core.hpp"
 #include "ck_tile/ops/common.hpp"
 #include "ck_tile/ops/rmsnorm2d/pipeline/rmsnorm2d_fwd_traits.hpp"
  
 namespace ck_tile {
  
 // host side args
 struct Rmsnorm2dFwdHostArgs
 {
     const void* p_x;          // [m ,n], input, fp16/bf16
     const void* p_x_residual; // [m ,n], shortcut input, prec same as input, nullptr if not used
     const void* p_sm_scale;   // [1 ,n], smooth scale input, fp32, nullptr if not used
     const void* p_gamma;      // [1, n], gamma, prec same as input
  
     void* p_y;          // [m, n], output, fp16/bf16
     void* p_y_residual; // [m, n], shortcut output, prec same as input, nullptr if not used
     void* p_y_scale;    // [m, 1], output a dynamic quant per row, nullptr if not used
     void* p_invRms;     // [m, 1], output inv-rms, prec same as input, nullptr if not used
     void* p_y_unquant;  // [m, n], output result before quant, nullptr if not used
  
     float epsilon;
  
     index_t m;
     index_t n;
     index_t x_stride;  // x row_stride
     index_t xr_stride; // x residule row stride
     index_t y_stride;  // y row stride
     index_t yr_stride; // y residule row stride
 };
  
 // TODO: Extract some type to wrapper class
 template <typename Pipeline_, typename Epilogue_>
 struct Rmsnorm2dFwd
 {
     using Pipeline = remove_cvref_t<Pipeline_>;
     using Epilogue = remove_cvref_t<Epilogue_>;
     using Problem  = typename Pipeline::Problem;
  
     using XDataType           = remove_cvref_t<typename Problem::XDataType>;
     using GammaDataType       = remove_cvref_t<typename Problem::GammaDataType>;
     using ComputeDataType     = remove_cvref_t<typename Problem::ComputeDataType>;
     using YDataType           = remove_cvref_t<typename Problem::YDataType>;
     using InvRmsDataType      = remove_cvref_t<typename Problem::InvRmsDataType>;
     using SmoothScaleDataType = remove_cvref_t<typename Problem::SmoothScaleDataType>;
     using YScaleDataType      = remove_cvref_t<typename Problem::YScaleDataType>;
     using UnquantYDataType    = remove_cvref_t<typename Problem::UnquantYDataType>;
  
     // for simplicity, shortcut input/output type is same as X
     using XResidualDataType = XDataType;
     using YResidualDataType = XDataType;
  
     static constexpr bool kHasGamma    = !std::is_same_v<GammaDataType, null_type>;
     static constexpr bool kSaveInvRms  = Problem::Traits::kSaveInvRms;
     static constexpr bool kSaveUnquant = Problem::Traits::kSaveUnquant;
  
     static constexpr index_t Block_M                = Problem::BlockShape::Block_M;
     static constexpr index_t Block_N                = Problem::BlockShape::Block_N;
     static constexpr bool kPadM                     = false; // always no need to pad along M
     static constexpr bool kPadN                     = Problem::Traits::kPadN;
     static constexpr bool kTwoPass                  = Problem::Traits::kTwoPass;
     static constexpr auto kFusedAdd                 = Problem::Traits::kFusedAdd;
     static constexpr auto kFusedQuant               = Problem::Traits::kFusedQuant;
     static constexpr auto kUseModelSensitiveRMSNorm = Problem::Traits::kUseModelSensitiveRMSNorm;
  
     static constexpr index_t ThreadPerWarp_N = Problem::BlockShape::ThreadPerWarp_N;
     static constexpr index_t Vector_N        = Problem::BlockShape::Vector_N;
     static constexpr index_t Repeat_N        = Problem::BlockShape::Repeat_N;
     static constexpr index_t kBlockSize      = Problem::BlockShape::BlockSize;
  
     static constexpr auto I0 = number<0>{};
     static constexpr auto I1 = number<1>{};
  
     struct Kargs
     {
         const void* p_x;
         const void* p_x_residual;
         const void* p_sm_scale;
         const void* p_gamma;
  
         void* p_y;
         void* p_y_residual;
         void* p_y_scale;
         void* p_invRms;
         void* p_y_unquant;
  
         float epsilon;
  
         index_t m;
         index_t n;
         index_t x_stride;  // x row_stride
         index_t xr_stride; // x residule row stride
         index_t y_stride;  // y row stride
         index_t yr_stride; // y residule row stride
     };
     using Hargs = Rmsnorm2dFwdHostArgs;
  
     CK_TILE_HOST static constexpr Kargs MakeKargs(const Hargs& hargs)
     {
         return Kargs{hargs.p_x,
                      hargs.p_x_residual,
                      hargs.p_sm_scale,
                      hargs.p_gamma,
                      hargs.p_y,
                      hargs.p_y_residual,
                      hargs.p_y_scale,
                      hargs.p_invRms,
                      hargs.p_y_unquant,
                      hargs.epsilon,
                      hargs.m,
                      hargs.n,
                      hargs.x_stride,
                      hargs.xr_stride,
                      hargs.y_stride,
                      hargs.yr_stride};
     }
  
     CK_TILE_HOST static constexpr auto GridSize(const Hargs& hargs)
     {
         return dim3(integer_divide_ceil(hargs.m, Block_M));
     }
  
     CK_TILE_HOST static constexpr auto BlockSize()
     {
         return is_wave32() ? Problem::BlockShape::template GetBlockSize<true>()
                            : Problem::BlockShape::template GetBlockSize<false>();
     }
  
     // clang-format off
     template <typename T> struct t2s;
     template <> struct t2s<float> { static constexpr const char * name = "fp32"; };
     template <> struct t2s<ck_tile::fp16_t> { static constexpr const char * name = "fp16"; };
     template <> struct t2s<ck_tile::bf16_t> { static constexpr const char * name = "bf16"; };
     template <> struct t2s<ck_tile::fp8_t> { static constexpr const char * name = "fp8"; };
     template <> struct t2s<ck_tile::bf8_t> { static constexpr const char * name = "bf8"; };
     template <> struct t2s<ck_tile::int8_t> { static constexpr const char * name = "int8"; };
     // clang-format on
  
     // in byte
     CK_TILE_HOST_DEVICE static constexpr index_t GetSmemSize() { return Pipeline::GetSmemSize(); }
  
     CK_TILE_HOST static std::string GetName()
     {
 #define _SS_ std::string
 #define _TS_ std::to_string
         // clang-format off
         using S_ = typename Problem::BlockShape;
         auto surfix = [&] () {
             std::string n;
             if (kFusedAdd != Rmsnorm2dFusedAddEnum::NO_ADD) n += _SS_("_") + Rmsnorm2dFusedAddEnumName<kFusedAdd>::name;
             if (kFusedQuant != Rmsnorm2dFusedQuantEnum::NO_SWEEP) n += _SS_("_") + Rmsnorm2dFusedQuantEnumName<kFusedQuant>::name;
             if (kPadN) n += "_pn";
             if (kSaveInvRms) n += "_rms";
             if (kTwoPass) n += "_2p";
             if (kUseModelSensitiveRMSNorm == Rmsnorm2dSensitiveEnum::NO_SPECIFIC_MODEL) n += "_nsm";
             else if (kUseModelSensitiveRMSNorm == Rmsnorm2dSensitiveEnum::T5_MODEL_LIKE) n += "_t5ml";
             return n; }();
  
         auto prec_str = [&] () {
             std::string base_str = _SS_(t2s<XDataType>::name);
             if (!std::is_same_v<XDataType, YDataType>) {
                 base_str += _SS_("_") + _SS_(t2s<YDataType>::name);
             }
             if (kFusedQuant == Rmsnorm2dFusedQuantEnum::SMOOTH_DYNAMIC_QUANT) {
                 base_str += _SS_("_sx") + _SS_(t2s<SmoothScaleDataType>::name);
                 base_str += _SS_("_sy") + _SS_(t2s<YScaleDataType>::name);
             }
             if (kFusedQuant == Rmsnorm2dFusedQuantEnum::DYNAMIC_QUANT) {
                 base_str += _SS_("_sy") + _SS_(t2s<YScaleDataType>::name);
             }
             return base_str;
         }();
  
         return _SS_("rmsnorm2d_fwd_") + _SS_(prec_str) + "_" +
              _TS_(S_::Block_M) + "x" + _TS_(S_::Block_N) + "_" + _TS_(S_::WarpPerBlock_M) + "x" + _TS_(S_::WarpPerBlock_N) + "_" +
              _TS_(S_::Warp_M) + "x" + _TS_(S_::Warp_N) + "_" + _TS_(S_::Vector_M) + "x" + _TS_(S_::Vector_N) + "_" +
              _SS_(Pipeline::name) + surfix;
         // clang-format on
 #undef _SS_
 #undef _TS_
     }
  
     CK_TILE_DEVICE void operator()(Kargs kargs) const
     {
         const auto iM = get_block_id() * Block_M;
  
         const auto x_window = [&]() {
             const auto tmp_ = make_naive_tensor_view<address_space_enum::global>(
                 static_cast<const XDataType*>(kargs.p_x),
                 make_tuple(kargs.m, kargs.n),
                 make_tuple(kargs.x_stride, 1),
                 number<Vector_N>{},
                 number<1>{});
  
             const auto tmp2_ = pad_tensor_view(
                 tmp_, make_tuple(number<Block_M>{}, number<Block_N>{}), sequence<kPadM, kPadN>{});
             return make_tile_window(
                 tmp2_, make_tuple(number<Block_M>{}, number<Block_N>{}), {iM, 0});
         }();
  
         const auto x_residual_window = [&]() {
             if constexpr(kFusedAdd == Rmsnorm2dFusedAddEnum::PRE_ADD ||
                          kFusedAdd == Rmsnorm2dFusedAddEnum::PRE_ADD_STORE)
             {
                 const auto tmp_ = make_naive_tensor_view<address_space_enum::global>(
                     static_cast<const XResidualDataType*>(kargs.p_x_residual),
                     make_tuple(kargs.m, kargs.n),
                     make_tuple(kargs.xr_stride, 1),
                     number<Vector_N>{},
                     number<1>{});
  
                 const auto tmp2_ = pad_tensor_view(tmp_,
                                                    make_tuple(number<Block_M>{}, number<Block_N>{}),
                                                    sequence<kPadM, kPadN>{});
                 return make_tile_window(
                     tmp2_, make_tuple(number<Block_M>{}, number<Block_N>{}), {iM, 0});
             }
             else
             {
                 return make_null_tile_window(make_tuple(number<Block_M>{}, number<Block_N>{}));
             }
         }();
  
         const auto gamma_window = [&]() {
             const auto tmp_ = make_naive_tensor_view<address_space_enum::global>(
                 static_cast<const GammaDataType*>(kargs.p_gamma),
                 make_tuple(kargs.n),
                 make_tuple(1),
                 number<Vector_N>{},
                 number<1>{});
  
             const auto tmp2_ =
                 pad_tensor_view(tmp_, make_tuple(number<Block_N>{}), sequence<kPadN>{});
  
             return make_tile_window(tmp2_, make_tuple(number<Block_N>{}), {0});
         }();
  
         auto y_window = [&]() {
             auto tmp_ = make_naive_tensor_view<address_space_enum::global>(
                 static_cast<YDataType*>(kargs.p_y),
                 make_tuple(kargs.m, kargs.n),
                 make_tuple(kargs.y_stride, 1),
                 number<Vector_N>{},
                 number<1>{});
  
             auto tmp2_ = pad_tensor_view(
                 tmp_, make_tuple(number<Block_M>{}, number<Block_N>{}), sequence<kPadM, kPadN>{});
             return make_tile_window(
                 tmp2_, make_tuple(number<Block_M>{}, number<Block_N>{}), {iM, 0});
         }();
  
         auto y_residual_window = [&]() {
             if constexpr(kFusedAdd == Rmsnorm2dFusedAddEnum::PRE_ADD_STORE)
             {
                 auto tmp_ = make_naive_tensor_view<address_space_enum::global>(
                     static_cast<YResidualDataType*>(kargs.p_y_residual),
                     make_tuple(kargs.m, kargs.n),
                     make_tuple(kargs.yr_stride, 1),
                     number<Vector_N>{},
                     number<1>{});
  
                 auto tmp2_ = pad_tensor_view(tmp_,
                                              make_tuple(number<Block_M>{}, number<Block_N>{}),
                                              sequence<kPadM, kPadN>{});
                 return make_tile_window(
                     tmp2_, make_tuple(number<Block_M>{}, number<Block_N>{}), {iM, 0});
             }
             else
             {
                 return make_null_tile_window(make_tuple(number<Block_M>{}, number<Block_N>{}));
             }
         }();
  
         auto inv_rms_window = [&]() {
             if constexpr(kSaveInvRms)
             {
                 const auto inv_rms_m = [&]() {
                     const auto inv_rms_dram_naive =
                         make_naive_tensor_view_packed<address_space_enum::global>(
                             static_cast<InvRmsDataType*>(kargs.p_invRms),
                             make_tuple(kargs.m),
                             number<1>{});
  
                     return pad_tensor_view(
                         inv_rms_dram_naive, make_tuple(number<Block_M>{}), sequence<kPadM>{});
                 }();
                 return make_tile_window(inv_rms_m, make_tuple(number<Block_M>{}), {iM});
             }
             else
                 return make_null_tile_window(make_tuple(number<Block_M>{}));
         }();
  
         auto sm_scale_window = [&]() {
             if constexpr(kFusedQuant == Rmsnorm2dFusedQuantEnum::SMOOTH_DYNAMIC_QUANT)
             {
                 const auto win_ = [&]() {
                     const auto tmp_0_ = make_naive_tensor_view_packed<address_space_enum::global>(
                         static_cast<const SmoothScaleDataType*>(kargs.p_sm_scale),
                         make_tuple(kargs.n),
                         number<Vector_N>{});
  
                     return pad_tensor_view(tmp_0_,
                                            make_tuple(number<Block_N>{}),
                                            sequence<false>{}); // sm_scale no need pad
                 }();
                 return make_tile_window(win_, make_tuple(number<Block_N>{}), {0});
             }
             else
             {
                 return make_null_tile_window(make_tuple(number<Block_N>{}));
             }
         }();
  
         auto y_scale_window = [&]() {
             if constexpr(kFusedQuant == Rmsnorm2dFusedQuantEnum::SMOOTH_DYNAMIC_QUANT ||
                          kFusedQuant == Rmsnorm2dFusedQuantEnum::DYNAMIC_QUANT)
             {
                 const auto win_ = [&]() {
                     const auto tmp_0_ = make_naive_tensor_view_packed<address_space_enum::global>(
                         static_cast<YScaleDataType*>(kargs.p_y_scale),
                         make_tuple(kargs.m),
                         number<1>{});
  
                     return pad_tensor_view(
                         tmp_0_, make_tuple(number<Block_M>{}), sequence<kPadM>{});
                 }();
                 return make_tile_window(win_, make_tuple(number<Block_M>{}), {iM});
             }
             else
             {
                 return make_null_tile_window(make_tuple(number<Block_M>{}));
             }
         }();
  
         auto unquant_y_window = [&]() {
             if constexpr((kFusedQuant == Rmsnorm2dFusedQuantEnum::SMOOTH_DYNAMIC_QUANT ||
                           kFusedQuant == Rmsnorm2dFusedQuantEnum::DYNAMIC_QUANT) &&
                          kSaveUnquant)
             {
                 auto tmp_ = make_naive_tensor_view<address_space_enum::global>(
                     static_cast<UnquantYDataType*>(kargs.p_y_unquant),
                     make_tuple(kargs.m, kargs.n),
                     make_tuple(kargs.y_stride, 1),
                     number<Vector_N>{},
                     number<1>{});
  
                 auto tmp2_ = pad_tensor_view(tmp_,
                                              make_tuple(number<Block_M>{}, number<Block_N>{}),
                                              sequence<kPadM, kPadN>{});
                 return make_tile_window(
                     tmp2_, make_tuple(number<Block_M>{}, number<Block_N>{}), {iM, 0});
             }
             else
             {
                 return make_null_tile_window(make_tuple(number<Block_M>{}, number<Block_N>{}));
             }
         }();
  
         __shared__ char smem[GetSmemSize()];
  
         Pipeline{}(x_window,
                    x_residual_window,
                    gamma_window,
                    y_window,
                    y_residual_window,
                    inv_rms_window,
                    sm_scale_window,
                    y_scale_window,
                    unquant_y_window,
                    static_cast<const ComputeDataType>(kargs.epsilon),
                    kargs.n,
                    smem,
                    Epilogue{});
     }
 };
  
 } // namespace ck_tile