[BYOC] DNNL C_SRC Fix (#14267)

Symptom:
After setting DNNL="C_SRC" to generate C code, the compiler
reported an error that the function "BindToCallNodeArgs"
was missing and there was a problem with linking "dtype_dl2dnnl".
Another issue is the compile complain for ambiguous "GetRootCall".

After fixing the compilation issue, when executing relay.build,
an error occurred complaining "Check failed: const_var_ndarray_
.count(var) > 0 (0 vs. 0)"

Solution:
Update the cmake file and change the codegen.cc.

cmake/modules/contrib/DNNL.cmake

@@ -52,6 +52,7 @@ elseif(USE_DNNL STREQUAL "C_SRC")
   find_library(EXTERN_LIBRARY_DNNL dnnl)
   list(APPEND TVM_RUNTIME_LINKER_LIBS ${EXTERN_LIBRARY_DNNL})
   tvm_file_glob(GLOB DNNL_CONTRIB_SRC src/runtime/contrib/dnnl/dnnl.cc
+                                      src/runtime/contrib/dnnl/dnnl_utils.cc
                                       src/runtime/contrib/cblas/dnnl_blas.cc)
   list(APPEND RUNTIME_SRCS ${DNNL_CONTRIB_SRC})
   message(STATUS "Build with DNNL C source module: " ${EXTERN_LIBRARY_DNNL})

src/relay/backend/contrib/dnnl/codegen.cc

@@ -50,6 +50,29 @@ namespace contrib {
 
 using namespace backend;
 
+/*!
+ * \brief Replace var expr which bind with args of call node
+ *
+ * \param args vector of expression (contains vars or constant nodes)
+ * \param cn call node which describe mapping of internal body vars with args
+ * \return updated vector of expressions
+ */
+static tvm::Array<Expr> BindToCallNodeArgs(const std::vector<Expr>& args, const CallNode* cn) {
+  tvm::Array<Expr> res;
+  for (const auto& arg : args) {
+    if (arg->IsInstance<ConstantNode>()) {
+      res.push_back(arg);
+    } else {
+      auto body_params = cn->op.as<FunctionNode>()->params;
+      auto found = std::find(body_params.begin(), body_params.end(), arg);
+      ICHECK(found != body_params.end());
+      auto idx = std::distance(body_params.begin(), found);
+      res.push_back(cn->args[idx]);
+    }
+  }
+  return res;
+}
+
 #ifndef USE_JSON_RUNTIME  // C source runtime
 inline size_t GetShape1DSize(const Type& type) {
   const auto shape = GetShape(type);
@@ -203,7 +226,8 @@ class CodegenDNNL : public MemoizedExprTranslator<std::vector<Output>>, public C
 
     // Give the ndarray a unique name to ease the initialization of it at
     // runtime.
-    std::string const_var_name = CreateConstVar(ext_func_id_, const_idx_);
+    std::string const_symbol = "dnnl_" + ext_func_id_;
+    std::string const_var_name = CreateConstVar(const_symbol, const_idx_);
     const_vars_.push_back(const_var_name);
     const_idx_++;
 
@@ -274,7 +298,8 @@ class CodegenDNNL : public MemoizedExprTranslator<std::vector<Output>>, public C
       return GenerateBody(conv_call, "dnnl_fused_conv2d_bias_relu", GetArgumentNames(caller),
                           Conv2d(conv_call));
     } else if (pattern_name == "dnnl.conv2d_relu") {
-      const auto* conv_call = GetRootCall(callee->body.as<CallNode>(), 1, {"nn.conv2d", "nn.relu"});
+      const auto* conv_call = GetRootCall(callee->body.as<CallNode>(), 1,
+                                          (const std::vector<std::string>){"nn.conv2d", "nn.relu"});
       return GenerateBody(conv_call, "dnnl_fused_conv2d_relu", GetArgumentNames(caller),
                           Conv2d(conv_call));
     }
@@ -434,29 +459,6 @@ class DNNLModuleCodegen : public CSourceModuleCodegenBase {
 
 #else  // DNNL JSON runtime
 
-/*!
- * \brief Replace var expr which bind with args of call node
- *
- * \param args vector of expression (contains vars or constant nodes)
- * \param cn call node which describe mapping of internal body vars with args
- * \return updated vector of expressions
- */
-static tvm::Array<Expr> BindToCallNodeArgs(const std::vector<Expr>& args, const CallNode* cn) {
-  tvm::Array<Expr> res;
-  for (const auto& arg : args) {
-    if (arg->IsInstance<ConstantNode>()) {
-      res.push_back(arg);
-    } else {
-      auto body_params = cn->op.as<FunctionNode>()->params;
-      auto found = std::find(body_params.begin(), body_params.end(), arg);
-      ICHECK(found != body_params.end());
-      auto idx = std::distance(body_params.begin(), found);
-      res.push_back(cn->args[idx]);
-    }
-  }
-  return res;
-}
-
 /*! \brief Serializer to DNNL JSON runtime module */
 class DNNLJSONSerializer : public backend::contrib::JSONSerializer {
   using JSONGraphNode = tvm::runtime::json::JSONGraphNode;