Enable re-init after OgaShutdown

[skottmckay]

Enable re-init after OgaShutdown. State returns to 'just loaded' post-OgaShutdown.
Allows user to control lifetime of the OrtEnv instance that is pinned in OgaGlobals.

See the plan document for details.

Adds some additional library load validation/diagnostic info (copied from ORT) so we stay in a clean state if an EP can't be loaded.

[Copilot]

Pull request overview

Enables using ONNX Runtime GenAI again after calling OgaShutdown() by refactoring GenAI’s process-global state to be destroyable/re-creatable (OrtGlobals), rebuilding device interfaces per env cycle, and adding a dedicated re-init test executable plus improved EP library load diagnostics.

Changes:

• Refactors OrtGlobals creation/teardown to support shutdown → re-init cycles, including per-cycle device-interface ownership/caching and CUDA add-on unload.
• Adds reinit_tests standalone binary and shared EP discovery/registration helpers to validate repeated teardown/reinit and device-interface recreation.
• Adds pre-flight EP library load validation and improves DLL dependency diagnostics to avoid half-registered EP states.

Reviewed changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
test/reinit_tests.cpp	New standalone tests exercising repeated OgaShutdown() + re-init and device-interface recreation.
test/ep_registration.h	Test-only EP discovery/registration helper for plugin EP DLLs (WinML + --ep_dir).
test/CMakeLists.txt	Builds reinit_tests separately from unit_tests and registers a new CTest entry.
src/webgpu/interface.h	Switches WebGPU interface accessor to a factory returning std::unique_ptr.
src/webgpu/interface.cpp	Implements WebGPU factory to create a fresh interface per env cycle.
src/search.cpp	Uses GetDeviceInterface(DeviceType::CPU) instead of the old CPU singleton accessor.
src/ryzenai/session_options.cpp	Routes RyzenAI setup through the device interface instance returned by GetDeviceInterface.
src/ryzenai/interface.h	Replaces RyzenAI singleton getter with a per-env factory API.
src/ryzenai/interface.cpp	Makes RyzenAI interface env-scoped and tolerant of “already registered” registration status.
src/qnn/interface.h	Replaces QNN singleton getter with a factory returning std::unique_ptr.
src/qnn/interface.cpp	Implements QNN factory and adds null checks for optional provider options shaping.
src/ort_genai_c.h	Updates OgaShutdown contract docs for lifetime rules and re-initialization semantics.
src/ort_genai_c.cpp	Adds EP library pre-flight load validation before registering with ORT.
src/openvino/interface.h	Replaces OpenVINO singleton getter with a factory returning std::unique_ptr.
src/openvino/interface.cpp	Implements OpenVINO factory; routes allocations/search creation through CPU device interface.
src/models/model.cpp	Minor formatting change near provider option shaping.
src/generators.h	Extends OrtGlobals with device-interface ownership/cache and CUDA library handle lifetime.
src/generators.cpp	Makes globals lazily re-creatable after shutdown; moves teardown to ~OrtGlobals; adds device-interface cache.
src/dml/interface.cpp	Uses CPU device interface instead of CPU singleton accessor for search creation.
src/dll_load_error.h	Adds CanLoadLibrary declaration (used for EP pre-flight) and improves documentation.
src/dll_load_error.cpp	Fixes Windows import-directory parsing (MappedAsImage=TRUE) and implements CanLoadLibrary on all platforms.
src/cpu/interface.h	Replaces CPU singleton getter with a factory returning std::unique_ptr.
src/cpu/interface.cpp	Implements CPU factory; makes InitOrt idempotent for re-init cycles.
docs/EnableReinitAfterOgaShutdown.md	New design/teardown-order plan document for shutdown + re-init.
CMakeLists.txt	Introduces onnxruntime-genai-obj OBJECT library split; adjusts link/usage requirements; adds MSVC warning suppression for newer toolsets.

[skottmckay]

@akholodnamdcom would you be able to validate the RyzenAI changes?

[Copilot]

Pull request overview

Copilot reviewed 25 out of 25 changed files in this pull request and generated 5 comments.

[Copilot]

Pull request overview

Copilot reviewed 25 out of 25 changed files in this pull request and generated no new comments.