chore: import upstream snapshot with attribution

paddle/phi/kernels/xpu/all_reduce_kernel.cc

@@ -0,0 +1,83 @@
+// Copyright (c) 2024 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "paddle/phi/kernels/all_reduce_kernel.h"
+#include "paddle/phi/backends/all_context.h"
+#include "paddle/phi/core/kernel_registry.h"
+#if defined(PADDLE_WITH_XPU_BKCL)
+#include "paddle/phi/core/distributed/bkcl_comm_context.h"
+#endif
+
+namespace phi {
+
+template <typename T, typename Context>
+void AllReduceKernel(const Context& dev_ctx,
+                     const DenseTensor& x,
+                     int reduce_type,
+                     DenseTensor* out) {
+#if defined(PADDLE_WITH_XPU_BKCL)
+  out->Resize(x.dims());
+  dev_ctx.template Alloc<T>(out);
+
+  auto comm_ctx =
+      static_cast<distributed::BKCLCommContext*>(dev_ctx.GetCommContext());
+  PADDLE_ENFORCE_NE(comm_ctx,
+                    nullptr,
+                    common::errors::Unavailable(
+                        "BKCLCommContext is nullptr, collective op should "
+                        "has ring_id attr."));
+
+  XPUStream stream = dev_ctx.stream();
+
+  BKCLOp bkcl_reduce_type = BKCL_ADD;
+  switch (static_cast<ReduceType>(reduce_type)) {
+    case ReduceType::kRedSum:
+      bkcl_reduce_type = BKCL_ADD;
+      break;
+
+    case ReduceType::kRedMax:
+      bkcl_reduce_type = BKCL_MAX;
+      break;
+
+    case ReduceType::kRedMin:
+      bkcl_reduce_type = BKCL_MIN;
+      break;
+
+    case ReduceType::kRedProd:
+      bkcl_reduce_type = BKCL_PRODUCT;
+      break;
+
+    default:
+      PADDLE_THROW(common::errors::InvalidArgument("Invalid reduce type: %d",
+                                                   reduce_type));
+  }
+
+  comm_ctx->AllReduce(out, x, bkcl_reduce_type, stream);
+#else
+  PADDLE_THROW(common::errors::PreconditionNotMet(
+      "PaddlePaddle should be compiled with XPU."));
+#endif
+}
+
+}  // namespace phi
+
+PD_REGISTER_KERNEL(all_reduce,
+                   XPU,
+                   ALL_LAYOUT,
+                   phi::AllReduceKernel,
+                   int,
+                   int64_t,
+                   float,
+                   phi::float16,
+                   phi::bfloat16) {}