SWDEV-434846 - Correct the vgprs per simd for MI300

Change-Id: Id4862da7611f64392bfc1538fb644801ec0a9e7f

hipamd/src/hip_platform.cpp

@@ -372,6 +372,12 @@ hipError_t ihipOccupancyMaxActiveBlocksPerMultiprocessor(
     VgprWaves = maxVGPRs / amd::alignUp(wrkGrpInfo->usedVGPRs_, VgprGranularity);
   }
 
+  if (VgprWaves == 0) {
+    // This should not happen ideally, but in case the usedVGPRs_/availableVGPRs_ values are
+    // incorrect, it can lead to a crash. By returning error, API can exit gracefully.
+    return hipErrorUnknown;
+  }
+
   size_t GprWaves = VgprWaves;
   if (wrkGrpInfo->usedSGPRs_ > 0) {
     size_t maxSGPRs = device.info().sgprsPerSimd_;

rocclr/device/rocm/rocdevice.cpp

@@ -1812,8 +1812,8 @@ bool Device::populateOCLDeviceConstants() {
       }
       break;
     case (9):
-      if ((isa().versionMinor() == 0 && isa().versionStepping() == 10) ||
-          (isa().versionMinor() == 4 && isa().versionStepping() == 0)) {
+      if ((isa().versionMinor() == 0 && isa().versionStepping() == 10) || // For gfx90a (MI200)
+          (isa().versionMinor() == 4)) {  // For gfx94x (MI300)
         info_.vgprAllocGranularity_ = 8;
         info_.vgprsPerSimd_ = 512;
       } else {