Exported main logger context for use in other layers

Signed-off-by: Russell McGuire <russell.w.mcguire@intel.com>

Author: rwmcguir

source/layers/validation/ze_validation_layer.cpp

@@ -11,6 +11,9 @@
 #include "param_validation.h"
 #include <memory>
 
+// Forward declaration — resolves at link time against ze_loader.so.
+extern "C" ZE_DLLEXPORT std::shared_ptr<loader::ZeLogger> *ZE_APICALL zelLoaderGetLogger();
+
 namespace validation_layer
 {
     context_t& context = context_t::getInstance();
@@ -25,7 +28,18 @@ namespace validation_layer
         enableThreadingValidation = getenv_tobool( "ZE_ENABLE_THREADING_VALIDATION" );
         verboseLogging = getenv_tobool( "ZEL_LOADER_LOGGING_ENABLE_SUCCESS_PRINT" );
 
-        logger = loader::createLogger("Validation Layer");
+        // Prefer the loader's already-constructed logger so both components
+        // share a single file handle, mutex, and startup banner.
+        // Fall back to creating an independent logger (e.g. static build).
+#ifndef L0_STATIC_LOADER_BUILD
+        auto *loaderLog = zelLoaderGetLogger();
+        if (loaderLog && *loaderLog) {
+            logger = *loaderLog;
+        } else
+#endif
+        {
+            logger = loader::createLogger("Validation Layer");
+        }
     }
 
     ///////////////////////////////////////////////////////////////////////////////

source/loader/ze_loader_api.cpp

@@ -59,6 +59,19 @@ zelLoaderGetContext() {
     return loader::context;
 }
 
+///////////////////////////////////////////////////////////////////////////////
+/// @brief Get the loader's shared logger instance.
+///
+ZE_DLLEXPORT std::shared_ptr<loader::ZeLogger> *ZE_APICALL
+zelLoaderGetLogger() {
+    if (loader::context == nullptr)
+        return nullptr;
+    auto &log = loader::context->zel_logger;
+    if (!log)
+        return nullptr;
+    return &log;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 /// @brief Internal function for Setting the ZE ddi table for the Tracing Layer.
 ///

source/loader/ze_loader_api.h

@@ -61,10 +61,21 @@ zeLoaderGetTracingHandle();
 /// @brief Get pointer to Loader Context
 ///
 /// @returns
-///     - ::handle to tracing library
+///     - ::Pointer to the Loader's Context
 ZE_DLLEXPORT loader::context_t *ZE_APICALL
 zelLoaderGetContext();
 
+///////////////////////////////////////////////////////////////////////////////
+/// @brief Get the loader's shared logger instance.
+///        Returns nullptr if the loader context is not yet initialized.
+///        Callers (e.g. the validation layer) should adopt this logger
+///        instead of creating their own to share a single file handle and mutex.
+///
+/// @returns
+///     - ::Pointer to the shared ZeLogger, or nullptr
+ZE_DLLEXPORT std::shared_ptr<loader::ZeLogger> *ZE_APICALL
+zelLoaderGetLogger();
+
 
 ///////////////////////////////////////////////////////////////////////////////
 /// @brief Exported function for getting version