[EP ABI] Add OrtKernelInfo APIs for kernel-based plugin EPs

cmake/onnxruntime_unittests.cmake

@@ -2133,8 +2133,8 @@ if (onnxruntime_BUILD_SHARED_LIB AND
           "${TEST_SRC_DIR}/autoep/library/example_plugin_ep_kernel_registry/kernels/squeeze.cc"
           "${TEST_SRC_DIR}/autoep/library/example_plugin_ep_kernel_registry/kernels/relu.h"
           "${TEST_SRC_DIR}/autoep/library/example_plugin_ep_kernel_registry/kernels/relu.cc"
-          "${TEST_SRC_DIR}/autoep/library/example_plugin_ep_kernel_registry/kernels/mul.h"
-          "${TEST_SRC_DIR}/autoep/library/example_plugin_ep_kernel_registry/kernels/mul.cc")
+          "${TEST_SRC_DIR}/autoep/library/example_plugin_ep_kernel_registry/kernels/binary_op.h"
+          "${TEST_SRC_DIR}/autoep/library/example_plugin_ep_kernel_registry/kernels/binary_op.cc")
   onnxruntime_add_shared_library_module(example_plugin_ep_kernel_registry ${onnxruntime_autoep_test_example_plugin_ep_kernel_registry_src})
   target_include_directories(example_plugin_ep_kernel_registry PRIVATE ${REPO_ROOT}/include/onnxruntime/core/session)
   target_link_libraries(example_plugin_ep_kernel_registry PRIVATE onnxruntime ${GSL_TARGET})

include/onnxruntime/core/framework/execution_provider.h

@@ -416,6 +416,15 @@ class IExecutionProvider {
     return InlinedVector<const Node*>();
   }
 
+  /**
+   * Returns the underlying OrtEp instance if this IExecutionProvider wraps a plugin EP.
+   * Otherwise, returns a nullptr (default implementation).
+   * This is used to retrieve the OrtEp instance from a OrtKernelInfo instance in a plugin EP's kernel implementation.
+   */
+  virtual const OrtEp* GetOrtEp() const {
+    return nullptr;
+  }
+
  private:
   const std::string type_;
 

include/onnxruntime/core/session/onnxruntime_c_api.h

@@ -4204,7 +4204,7 @@ struct OrtApi {
    * If `out` is nullptr, the value of `size` is set to the size of the name
    * string (including null-terminator), and a success status is returned.
    *
-   * If the `size` parameter is greater than or equal to the name string's size,
+   * If the `size` parameter is greater than or equal to the name string's size and `out` is not nullptr,
    * the value of `size` is set to the true size of the string (including null-terminator),
    * the provided memory is filled with the string's contents, and a success status is returned.
    *
@@ -4220,7 +4220,7 @@ struct OrtApi {
    * \snippet{doc} snippets.dox OrtStatus Return Value
    * \since Version 1.14
    */
-  ORT_API2_STATUS(KernelInfo_GetInputName, _In_ const OrtKernelInfo* info, size_t index, _Out_ char* out,
+  ORT_API2_STATUS(KernelInfo_GetInputName, _In_ const OrtKernelInfo* info, size_t index, _Out_opt_ char* out,
                   _Inout_ size_t* size);
 
   /** \brief Get the name of a ::OrtKernelInfo's output.
@@ -4231,7 +4231,7 @@ struct OrtApi {
    * If `out` is nullptr, the value of `size` is set to the size of the name
    * string (including null-terminator), and a success status is returned.
    *
-   * If the `size` parameter is greater than or equal to the name string's size,
+   * If the `size` parameter is greater than or equal to the name string's size and `out` is not nullptr,
    * the value of `size` is set to the true size of the string (including null-terminator),
    * the provided memory is filled with the string's contents, and a success status is returned.
    *
@@ -4248,7 +4248,7 @@ struct OrtApi {
    * \snippet{doc} snippets.dox OrtStatus Return Value
    * \since Version 1.14
    */
-  ORT_API2_STATUS(KernelInfo_GetOutputName, _In_ const OrtKernelInfo* info, size_t index, _Out_ char* out,
+  ORT_API2_STATUS(KernelInfo_GetOutputName, _In_ const OrtKernelInfo* info, size_t index, _Out_opt_ char* out,
                   _Inout_ size_t* size);
 
   /** \brief Get the type information for a ::OrtKernelInfo's input.
@@ -4428,7 +4428,7 @@ struct OrtApi {
    * If `out` is nullptr, the value of `size` is set to the size of the name
    * string (including null-terminator), and a success status is returned.
    *
-   * If the `size` parameter is greater than or equal to the name string's size,
+   * If the `size` parameter is greater than or equal to the name string's size and `out` is not nullptr,
    * the value of `size` is set to the true size of the string (including null-terminator),
    * the provided memory is filled with the string's contents, and a success status is returned.
    *
@@ -4445,7 +4445,7 @@ struct OrtApi {
    * \snippet{doc} snippets.dox OrtStatus Return Value
    * \since Version 1.15
    */
-  ORT_API2_STATUS(KernelInfo_GetNodeName, _In_ const OrtKernelInfo* info, _Out_ char* out, _Inout_ size_t* size);
+  ORT_API2_STATUS(KernelInfo_GetNodeName, _In_ const OrtKernelInfo* info, _Out_opt_ char* out, _Inout_ size_t* size);
 
   /** \brief Get the session logger from ::OrtKernelInfo.
    *
@@ -6608,6 +6608,65 @@ struct OrtApi {
    * \since Version 1.24
    */
   ORT_API2_STATUS(KernelInfo_GetConfigEntries, _In_ const OrtKernelInfo* info, _Outptr_ OrtKeyValuePairs** out);
+
+  /** \brief Get the graph node's operator domain from ::OrtKernelInfo.
+   *
+   * If `out` is nullptr, the value of `size` is set to the size of the operator domain
+   * string (including null-terminator), and a success status is returned.
+   *
+   * If the `size` parameter is greater than or equal to the string's size and `out` is not nullptr,
+   * the value of `size` is set to the true size of the string (including null-terminator),
+   * the provided memory is filled with the string's contents, and a success status is returned.
+   *
+   * If the `size` parameter is less than the actual string's size and `out`
+   * is not nullptr, the value of `size` is set to the true size of the string
+   * and a failure status with error code ORT_INVALID_ARGUMENT is returned.
+   *
+   * \param[in] info An instance of ::OrtKernelInfo.
+   * \param[out] out Memory location into which to write the UTF-8 null-terminated string representing the
+   *                 operator domain.
+   * \param[in,out] size Pointer to the size of the `out` buffer. See above comments for details.
+   *
+   * \snippet{doc} snippets.dox OrtStatus Return Value
+   * \since Version 1.24
+   */
+  ORT_API2_STATUS(KernelInfo_GetOperatorDomain, _In_ const OrtKernelInfo* info, _Out_opt_ char* out,
+                  _Inout_ size_t* size);
+
+  /** \brief Get the graph node's operator type from ::OrtKernelInfo.
+   *
+   * If `out` is nullptr, the value of `size` is set to the size of the operator type
+   * string (including null-terminator), and a success status is returned.
+   *
+   * If the `size` parameter is greater than or equal to the string's size and `out` is not nullptr,
+   * the value of `size` is set to the true size of the string (including null-terminator),
+   * the provided memory is filled with the string's contents, and a success status is returned.
+   *
+   * If the `size` parameter is less than the actual string's size and `out`
+   * is not nullptr, the value of `size` is set to the true size of the string
+   * and a failure status with error code ORT_INVALID_ARGUMENT is returned.
+   *
+   * \param[in] info An instance of ::OrtKernelInfo.
+   * \param[out] out Memory location into which to write the UTF-8 null-terminated string representing the
+   *                 operator type.
+   * \param[in,out] size Pointer to the size of the `out` buffer. See above comments for details.
+   *
+   * \snippet{doc} snippets.dox OrtStatus Return Value
+   * \since Version 1.24
+   */
+  ORT_API2_STATUS(KernelInfo_GetOperatorType, _In_ const OrtKernelInfo* info, _Out_opt_ char* out,
+                  _Inout_ size_t* size);
+
+  /** \brief Get the opset version in which the given node's operator type was first defined from ::OrtKernelInfo.
+   *
+   * \param[in] info An instance of ::OrtKernelInfo.
+   * \param[out] since_version The opset version in which the node's operator type was first defined.
+   *
+   * \snippet{doc} snippets.dox OrtStatus Return Value
+   * \since Version 1.24
+   */
+  ORT_API2_STATUS(KernelInfo_GetOperatorSinceVersion, _In_ const OrtKernelInfo* info,
+                  _Out_ int* since_version);
 };
 
 /*

include/onnxruntime/core/session/onnxruntime_cxx_api.h

@@ -2782,6 +2782,11 @@ struct KernelInfoImpl : Base<T> {
   Logger GetLogger() const;
 
   KeyValuePairs GetConfigEntries() const;
+
+  std::string GetOperatorDomain() const;  ///< Wraps OrtApi::KernelInfo_GetOperatorDomain
+  std::string GetOperatorType() const;    ///< Wraps OrtApi::KernelInfo_GetOperatorType
+  int GetOperatorSinceVersion() const;    ///< Wraps OrtApi::KernelInfo_GetOperatorSinceVersion
+  const OrtEp* GetEp() const;             ///< Wraps OrtEpApi::KernelInfo_GetEp
 };
 
 }  // namespace detail

include/onnxruntime/core/session/onnxruntime_cxx_inline.h

@@ -2842,6 +2842,50 @@ inline KeyValuePairs KernelInfoImpl<T>::GetConfigEntries() const {
   return KeyValuePairs{out};
 }
 
+template <typename T>
+inline std::string KernelInfoImpl<T>::GetOperatorDomain() const {
+  size_t size = 0;
+
+  // Feed nullptr for the data buffer to query the true size of the string value
+  Ort::ThrowOnError(GetApi().KernelInfo_GetOperatorDomain(this->p_, nullptr, &size));
+
+  std::string out;
+  out.resize(size);
+  Ort::ThrowOnError(GetApi().KernelInfo_GetOperatorDomain(this->p_, &out[0], &size));
+  out.resize(size - 1);  // remove the terminating character '\0'
+
+  return out;
+}
+
+template <typename T>
+inline std::string KernelInfoImpl<T>::GetOperatorType() const {
+  size_t size = 0;
+
+  // Feed nullptr for the data buffer to query the true size of the string value
+  Ort::ThrowOnError(GetApi().KernelInfo_GetOperatorType(this->p_, nullptr, &size));
+
+  std::string out;
+  out.resize(size);
+  Ort::ThrowOnError(GetApi().KernelInfo_GetOperatorType(this->p_, &out[0], &size));
+  out.resize(size - 1);  // remove the terminating character '\0'
+
+  return out;
+}
+
+template <typename T>
+inline int KernelInfoImpl<T>::GetOperatorSinceVersion() const {
+  int out = 0;
+  Ort::ThrowOnError(GetApi().KernelInfo_GetOperatorSinceVersion(this->p_, &out));
+  return out;
+}
+
+template <typename T>
+inline const OrtEp* KernelInfoImpl<T>::GetEp() const {
+  const OrtEp* ep = nullptr;
+  Ort::ThrowOnError(GetEpApi().KernelInfo_GetEp(this->p_, &ep));
+  return ep;
+}
+
 inline void attr_utils::GetAttr(const OrtKernelInfo* p, const char* name, float& out) {
   Ort::ThrowOnError(GetApi().KernelInfoGetAttribute_float(p, name, &out));
 }

include/onnxruntime/core/session/onnxruntime_ep_c_api.h

@@ -971,6 +971,18 @@ struct OrtEpApi {
                   _In_ OrtSharedPrePackedWeightCache* prepacked_weight_cache,
                   _In_reads_(num_buffers) void** buffer_data_ptrs, _In_reads_(num_buffers) size_t* buffer_data_sizes,
                   _In_ size_t num_buffers);
+
+  /** \brief Get the OrtEp instance to which the node is assigned from the OrtKernelInfo.
+   *
+   * \note Used within OrtKernelImpl implementations to obtain a reference to the OrtEp.
+   *
+   * \param[in] info The ::OrtKernelInfo instance.
+   * \param[out] ep Output parameter set to the OrtEp instance associated with the OrtKernelInfo.
+   *
+   * \snippet{doc} snippets.dox OrtStatus Return Value
+   * \since Version 1.24
+   */
+  ORT_API2_STATUS(KernelInfo_GetEp, _In_ const OrtKernelInfo* info, _Outptr_ const OrtEp** ep);
 };
 
 /**