vISA: Set iga::SWSB_ENCODE_MODE to ThreeDistPipeDPMath for MTL

IGA doesn't distinguish MTL from other XE_HPG platforms in its models.
Set the correct SWSB_ENCODE_MODE from vISA when MTL is used to avoid
swsb verifier errors.

Add function BinaryEncodingIGA::getIGASWSBEncodeMode to unify
SWSBEncodeMode getter

visa/BinaryEncodingIGA.cpp

@@ -94,6 +94,7 @@ class BinaryEncodingIGA {
   static Region::Width getIGAWidth(int width);
   static Region::Horz getIGAHorz(int hstride);
   static Region getIGARegion(G4_SrcRegRegion *srcRegion, int srcPos);
+  SWSB_ENCODE_MODE getIGASWSBEncodeMode() const;
 
   MathMacroExt getIGAImplAcc(G4_AccRegSel accSel) const {
     switch (accSel) {
@@ -384,6 +385,14 @@ BinaryEncodingIGA::BinaryEncodingIGA(vISA::G4_Kernel &k, std::string fname)
   IGAKernel = new Kernel(*platformModel);
 }
 
+SWSB_ENCODE_MODE BinaryEncodingIGA::getIGASWSBEncodeMode() const {
+
+  if (platform == TARGET_PLATFORM::Xe_MTL)
+    return SWSB_ENCODE_MODE::ThreeDistPipeDPMath;
+
+  return platformModel->getSWSBEncodeMode();
+}
+
 InstOptSet BinaryEncodingIGA::getIGAInstOptSet(G4_INST *inst) const {
   InstOptSet options;
 
@@ -986,8 +995,7 @@ void BinaryEncodingIGA::SetSWSB(G4_INST *inst, SWSB &sw) {
   // This workaround can be removed once vISA doesn't produce such SWSB.
   // Currently this could happen only on EOT send.
   if (inst->isSend() && !sw.hasBothDistAndToken() &&
-      !sw.verify(IGAKernel->getModel().getSWSBEncodeMode(),
-                 SWSB::InstType::SEND)) {
+      !sw.verify(getIGASWSBEncodeMode(), SWSB::InstType::SEND)) {
     sw.tokenType = SWSB::TokenType::SET;
     if (sw.hasDist()) {
       // if the distance type cannot be combined with SBID.set, force
@@ -1105,7 +1113,7 @@ void BinaryEncodingIGA::Encode() {
   std::list<std::pair<Instruction *, G4_INST *>> encodedInsts;
   Block *bbNew = nullptr;
 
-  SWSB_ENCODE_MODE swsbEncodeMode = IGAKernel->getModel().getSWSBEncodeMode();
+  SWSB_ENCODE_MODE swsbEncodeMode = getIGASWSBEncodeMode();
 
   for (auto bb : this->kernel.fg) {
     for (auto inst : *bb) {