bias support

include/ck_tile/ops/fmha/pipeline/block_fmha_bwd_dq_dk_dv_pipeline_kr_ktr_vr.hpp

@@ -384,7 +384,11 @@ struct BlockFmhaBwdDQDKDVPipelineKRKTRVR
                              Policy::template MakeBiasTileDistribution<Problem>());
 
         BiasDataType* biast_lds_ptr = static_cast<BiasDataType*>(static_cast<void*>(
-            static_cast<char*>(smem_ptr) + Policy::template GetSmemSizeQT<Problem>()));
+            static_cast<char*>(smem_ptr) + Policy::template GetSmemSizeQT<Problem>() +
+            Policy::template GetSmemSizeOGrad<Problem>() +
+            Policy::template GetSmemSizeOGradT<Problem>() +
+            Policy::template GetSmemSizeQ<Problem>() + Policy::template GetSmemSizeLSE<Problem>() +
+            Policy::template GetSmemSizeD<Problem>()));
 
         auto biast_lds = make_tensor_view<address_space_enum::lds>(
             biast_lds_ptr, Policy::template MakeBiasTLdsBlockDescriptor<Problem>());
@@ -555,9 +559,7 @@ struct BlockFmhaBwdDQDKDVPipelineKRKTRVR
             // STAGE 2, Scale, Add bias, Mask, Softmax, Dropout
             if constexpr(BiasEnum == BlockAttentionBiasEnum::ELEMENTWISE_BIAS)
             {
-
                 const auto bias_tile  = load_tile(bias_dram_window);
-                block_sync_lds();
                 auto bias_shuffle_tmp = make_static_distributed_tensor<BiasDataType>(
                     Policy::template MakeShuffledBiasTileDistribution<Problem>());
                 shuffle_tile(bias_shuffle_tmp, bias_tile);
@@ -571,6 +573,7 @@ struct BlockFmhaBwdDQDKDVPipelineKRKTRVR
                     st_acc,
                     biast_tile);
                 move_tile_window(bias_dram_window, {kM0, 0});
+                __builtin_amdgcn_sched_barrier(0);
             }
             else if constexpr(BiasEnum == BlockAttentionBiasEnum::ALIBI)
             {
@@ -725,6 +728,7 @@ struct BlockFmhaBwdDQDKDVPipelineKRKTRVR
                 shuffle_tile(dbiast_shuffle_tmp, dbiast_tile);
                 store_tile(dbias_dram_window, dbiast_shuffle_tmp);
                 move_tile_window(dbias_dram_window, {kM0, 0});
+                __builtin_amdgcn_sched_barrier(0);
             }
 
             // STAGE 6, SGrad^T@Q^T Gemm3
@@ -807,9 +811,7 @@ struct BlockFmhaBwdDQDKDVPipelineKRKTRVR
         // STAGE 2, Scale, Add bias, Mask, Softmax, Dropout
         if constexpr(BiasEnum == BlockAttentionBiasEnum::ELEMENTWISE_BIAS)
         {
-
             const auto bias_tile  = load_tile(bias_dram_window);
-            block_sync_lds();
             auto bias_shuffle_tmp = make_static_distributed_tensor<BiasDataType>(
                 Policy::template MakeShuffledBiasTileDistribution<Problem>());
             shuffle_tile(bias_shuffle_tmp, bias_tile);

include/ck_tile/ops/fmha/pipeline/block_fmha_bwd_pipeline_default_policy.hpp

@@ -331,21 +331,17 @@ struct BlockFmhaBwdPipelineDefaultPolicy
     template <typename Problem>
     CK_TILE_HOST_DEVICE static constexpr auto GetTransposedAlignmentBias()
     {
-        using BiasDataType = remove_cvref_t<typename Problem::BiasDataType>;
-
         constexpr index_t kBlockSize = Problem::kBlockSize;
         constexpr index_t kMPerBlock = Problem::BlockFmhaShape::kM0;
         constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN0;
 
         constexpr index_t kTotalPixels = kMPerBlock * kNPerBlock / kBlockSize;
 
-        constexpr index_t kMaxVecLoad = 16 / sizeof(BiasDataType);
-        constexpr index_t kMinVecLoad = 4 / sizeof(BiasDataType);
-
-        constexpr index_t kVecLoad = ((kTotalPixels / kMaxVecLoad) >= kMinVecLoad)
-                                         ? kMaxVecLoad
-                                         : (kTotalPixels / kMinVecLoad);
-        return kVecLoad;
+        // TODO: not correct!
+        if constexpr(kTotalPixels > 32)
+            return 8;
+        else
+            return 4;
     }
 
     template <typename Problem>
@@ -617,7 +613,9 @@ struct BlockFmhaBwdPipelineDefaultPolicy
     template <typename Problem>
     CK_TILE_HOST_DEVICE static constexpr auto GetSmemKPackBias()
     {
-        return GetAlignmentBias<Problem>();
+        // TODO: this is for 3d layout
+        using BiasDataType = remove_cvref_t<typename Problem::BiasDataType>;
+        return 16 / sizeof(BiasDataType);
     }
 
     template <typename Problem>
@@ -1682,7 +1680,7 @@ struct BlockFmhaBwdPipelineDefaultPolicy
         constexpr index_t smem_size_stage0_1 = smem_size_v;
         constexpr index_t smem_size_stage1   = smem_size_qt + smem_size_q + +smem_size_dot +
                                              smem_size_do + smem_size_lse + smem_size_d +
-                                             smem_size_ds;
+                                             max(smem_size_bias, smem_size_ds);
         constexpr index_t smem_size_stage2 = smem_size_qt + smem_size_bias;
         constexpr index_t smem_size_stage3 = smem_size_qt;
         constexpr index_t smem_size_stage4 = smem_size_qt + smem_size_do + smem_size_d;