Write QNN context binary to file when profiling level is detailed (pytorch#6745)

Summary: Pull Request resolved: pytorch#6745

Reviewed By: billmguo

Differential Revision: D65694854

Author: limintang

backends/qualcomm/runtime/QnnManager.cpp

@@ -530,6 +530,23 @@ Error QnnManager::Compile(
             qnn_executorch_context_binary) == Error::Ok,
         Internal,
         "Fail to get context binary.");
+
+    // Write context binary to file for debugging purpose
+    auto qnn_profile_level =
+        backend_params_ptr_->qnn_graph_ptr_->GetProfile()->GetQnnProfileLevel();
+    if (qnn_profile_level == QNN_PROFILE_LEVEL_DETAILED) {
+      static const char* binary_file = "/tmp/qnn_context_binary.bin";
+      std::ofstream fout(binary_file, std::ios::binary);
+      fout.write(
+          reinterpret_cast<const char*>(qnn_executorch_context_binary.buffer),
+          qnn_executorch_context_binary.nbytes);
+
+      if (!fout) {
+        QNN_EXECUTORCH_LOG_WARN(
+            "Failed to write QNN context binary to file %s", binary_file);
+      }
+      fout.close();
+    }
   }
 
   return Error::Ok;

backends/qualcomm/runtime/backends/QnnProfiler.cpp

@@ -20,20 +20,19 @@ QnnProfile::QnnProfile(
   if (profile_level != QnnExecuTorchProfileLevel::kProfileOff) {
     const QnnInterface& qnn_interface = implementation_.GetQnnInterface();
 
-    QnnProfile_Level_t qnnProfileLevel = 0;
     if (profile_level == QnnExecuTorchProfileLevel::kProfileBasic) {
-      qnnProfileLevel = QNN_PROFILE_LEVEL_BASIC;
+      qnnProfileLevel_ = QNN_PROFILE_LEVEL_BASIC;
     } else if (
         profile_level == QnnExecuTorchProfileLevel::kProfileDetailed ||
         profile_level == QnnExecuTorchProfileLevel::kProfileOptrace) {
-      qnnProfileLevel = QNN_PROFILE_LEVEL_DETAILED;
+      qnnProfileLevel_ = QNN_PROFILE_LEVEL_DETAILED;
     } else {
       QNN_EXECUTORCH_LOG_WARN("Invalid profile level");
       return;
     }
 
     Qnn_ErrorHandle_t error = qnn_interface.qnn_profile_create(
-        backend_->GetHandle(), qnnProfileLevel, &handle_);
+        backend_->GetHandle(), qnnProfileLevel_, &handle_);
     if (error != QNN_SUCCESS) {
       QNN_EXECUTORCH_LOG_WARN(
           "Failed to create profile_handle for backend "

backends/qualcomm/runtime/backends/QnnProfiler.h

@@ -29,8 +29,13 @@ class QnnProfile {
     return handle_;
   }
 
+  const QnnProfile_Level_t& GetQnnProfileLevel() const {
+    return qnnProfileLevel_;
+  }
+
  private:
   Qnn_ProfileHandle_t handle_;
+  QnnProfile_Level_t qnnProfileLevel_ = 0;
   const QnnImplementation& implementation_;
   QnnBackend* backend_;
 };