chore: import upstream snapshot with attribution

samples/common/globalTimerKernel.h

@@ -0,0 +1,42 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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.
+ */
+
+#ifndef TRT_GLOBAL_TIMER_KERNEL_H
+#define TRT_GLOBAL_TIMER_KERNEL_H
+
+#include <cstdint>
+#include <cuda_runtime_api.h>
+
+namespace sample
+{
+//! Launch a single-thread kernel that writes the current value of the PTX
+//! %globaltimer register (GPU timer in ns) to \p dTimestamp on \p stream.
+//!
+//! Used as a replacement for cudaEventElapsedTime() when Confidential Compute
+//! is enabled, where cudaEventElapsedTime() is documented to be unreliable.
+//!
+//! \param dTimestamp Device pointer to a uint64_t. Must be non-null and point
+//!     to valid device memory reachable from \p stream.
+//! \param stream CUDA stream on which to launch the kernel.
+//! \return Result of \c cudaGetLastError() after the launch. This reports
+//!     synchronous launch errors only; asynchronous execution errors will
+//!     surface on a subsequent \c cudaEventRecord /
+//!     \c cudaStreamSynchronize / similar.
+[[nodiscard]] cudaError_t launchGlobalTimerKernel(uint64_t* dTimestamp, cudaStream_t stream) noexcept;
+} // namespace sample
+
+#endif // TRT_GLOBAL_TIMER_KERNEL_H