[TRTRTX EP] Implement OrtExternalResourceImporter for D3D12-CUDA interop #26829
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This commit adds the OrtExternalResourceImporter implementation for the NvTensorRtRtx execution provider, enabling zero-copy D3D12 to CUDA memory sharing and GPU synchronization. Implementation: - NvTrtRtxExternalResourceImporterImpl: Full implementation of the OrtExternalResourceImporter interface using CUDA Driver APIs - Memory import: cuImportExternalMemory for D3D12_RESOURCE and D3D12_HEAP - Semaphore import: cuImportExternalSemaphore for D3D12_FENCE - Tensor creation: CreateTensorFromMemory wraps imported CUDA device pointers - Synchronization: WaitSemaphore/SignalSemaphore using cuWaitExternalSemaphoresAsync/cuSignalExternalSemaphoresAsync Tests (nv_external_resource_importer_test.cc): - CreateExternalResourceImporter: Basic importer creation - CanImportMemoryCapabilities: D3D12 Resource/Heap capability queries - CanImportSemaphoreCapabilities: D3D12 Fence capability queries - ImportD3D12SharedResource: Memory import validation - CreateTensorFromImportedMemory: Tensor creation with CUDA device ptr verification - ImportD3D12Fence: Semaphore import validation - WaitAndSignalSemaphore: Bidirectional D3D12-CUDA sync - FullInferenceWithExternalMemory: E2E test with ReLU model verifying D3D12 upload -> CUDA inference -> D3D12 readback pipeline
skottmckay
reviewed
Dec 19, 2025
onnxruntime/core/providers/nv_tensorrt_rtx/nv_provider_factory.cc
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onnxruntime/core/providers/nv_tensorrt_rtx/nv_provider_factory.cc
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onnxruntime/test/providers/nv_tensorrt_rtx/nv_external_resource_importer_test.cc
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Description
This commit adds the OrtExternalResourceImporter implementation for the NvTensorRtRtx execution provider, enabling zero-copy D3D12 to CUDA memory sharing and GPU synchronization.
Implementation:
Tests (nv_external_resource_importer_test.cc):
Motivation and Context
#26821