diff --git a/include/hip/hcc_detail/hip_runtime_api.h b/include/hip/hcc_detail/hip_runtime_api.h
index ed5ab85923..40b4928d21 100644
--- a/include/hip/hcc_detail/hip_runtime_api.h
+++ b/include/hip/hcc_detail/hip_runtime_api.h
@@ -1196,6 +1196,20 @@ hipError_t hipStreamGetPriority(hipStream_t stream, int* priority);
 hipError_t hipExtStreamCreateWithCUMask(hipStream_t* stream, uint32_t cuMaskSize, const uint32_t* cuMask);
 
 
+/**
+ * @brief Get CU mask associated with an asynchronous stream
+ *
+ * @param[in] stream stream to be queried
+ * @param[in] cuMaskSize number of the block of memories (uint32_t *) allocated by user
+ * @param[out] cuMask Pointer to a pre-allocated block of memories (uint32_t *) in which
+ * the stream's CU mask is returned. The CU mask is returned in a chunck of 32 bits where
+ * each active bit represents one active CU
+ * @return #hipSuccess, #hipErrorInvalidHandle, #hipErrorInvalidValue
+ *
+ * @see hipStreamCreate, hipStreamSynchronize, hipStreamWaitEvent, hipStreamDestroy
+ */
+hipError_t hipExtStreamGetCUMask(hipStream_t stream, uint32_t cuMaskSize, uint32_t* cuMask);
+
 /**
  * Stream CallBack struct
  */
diff --git a/rocclr/hip_hcc.def.in b/rocclr/hip_hcc.def.in
index cc8cd86e0a..f6c93581a4 100755
--- a/rocclr/hip_hcc.def.in
+++ b/rocclr/hip_hcc.def.in
@@ -266,3 +266,4 @@ hipMemcpyHtoA
 hipMemcpyParam2DAsync
 __gnu_h2f_ieee
 __gnu_f2h_ieee
+hipExtStreamGetCUMask
diff --git a/rocclr/hip_hcc.map.in b/rocclr/hip_hcc.map.in
index 5b5dcf692a..82ddc72323 100755
--- a/rocclr/hip_hcc.map.in
+++ b/rocclr/hip_hcc.map.in
@@ -275,6 +275,7 @@ global:
     hipMemcpyHtoA;
     hipMemcpyParam2DAsync;
     __hipGetPCH;
+    hipExtStreamGetCUMask;
     };
 local:
     *;
diff --git a/rocclr/hip_internal.hpp b/rocclr/hip_internal.hpp
index 7e0cc8b9a2..857ae8e07f 100755
--- a/rocclr/hip_internal.hpp
+++ b/rocclr/hip_internal.hpp
@@ -156,6 +156,8 @@ namespace hip {
     unsigned int Flags() const { return flags_; }
     /// Returns the priority for the current stream
     Priority GetPriority() const { return priority_; }
+    /// Returns the CU mask for the current stream
+    const std::vector<uint32_t> GetCUMask() const { return cuMask_; }
 
     /// Sync all non-blocking streams
     static void syncNonBlockingStreams();
diff --git a/rocclr/hip_stream.cpp b/rocclr/hip_stream.cpp
index 109e8c8b7d..24312f018d 100755
--- a/rocclr/hip_stream.cpp
+++ b/rocclr/hip_stream.cpp
@@ -396,3 +396,87 @@ hipError_t hipStreamGetPriority(hipStream_t stream, int* priority) {
   HIP_RETURN(hipSuccess);
 
 }
+
+// ================================================================================================
+hipError_t hipExtStreamGetCUMask(hipStream_t stream, uint32_t cuMaskSize, uint32_t* cuMask) {
+  HIP_INIT_API(hipExtStreamGetCUMask, stream, cuMaskSize, cuMask);
+
+  if (cuMask == nullptr) {
+    HIP_RETURN(hipErrorInvalidValue);
+  }
+
+  int deviceId = hip::getCurrentDevice()->deviceId();
+  auto* deviceHandle = g_devices[deviceId]->devices()[0];
+  const auto& info = deviceHandle->info();
+
+  // find the minimum cuMaskSize required to present the CU mask bit-array in a patch of 32 bits
+  // and return error if the cuMaskSize argument is less than cuMaskSizeRequired
+  uint32_t cuMaskSizeRequired = info.maxComputeUnits_ / 32 +
+    ((info.maxComputeUnits_ % 32) ? 1 : 0);
+
+  if (cuMaskSize < cuMaskSizeRequired) {
+    HIP_RETURN(hipErrorInvalidValue);
+  }
+
+  // make a default CU mask bit-array where all CUs are active
+  // this default mask will be returned when there is no
+  // custom or global CU mask defined
+  std::vector<uint32_t> defaultCUMask;
+  uint32_t temp = 0;
+  uint32_t bit_index = 0;
+  for (uint32_t i = 0; i < info.maxComputeUnits_; i++) {
+    temp |= 1UL << bit_index;
+    if (bit_index >= 32) {
+      defaultCUMask.push_back(temp);
+      temp = 0;
+      bit_index = 0;
+      temp |= 1UL << bit_index;
+    }
+    bit_index += 1;
+  }
+  if (bit_index != 0) {
+    defaultCUMask.push_back(temp);
+  }
+
+  // if the stream is null then either return globalCUMask_ (if it is defined)
+  // or return defaultCUMask
+  if (stream == nullptr) {
+    if (info.globalCUMask_.size() != 0) {
+      std::copy(info.globalCUMask_.begin(), info.globalCUMask_.end(), cuMask);
+    } else {
+      std::copy(defaultCUMask.begin(), defaultCUMask.end(), cuMask);
+    }
+  } else {
+  // if the stream is not null then get the stream's CU mask and return one of the below cases
+  // case1 if globalCUMask_ is defined then return the AND of globalCUMask_ and stream's CU mask
+  // case2 if globalCUMask_ is not defined then retuen AND of defaultCUMask and stream's CU mask
+  // in both cases above if stream's CU mask is empty then either globalCUMask_ (for case1)
+  // or defaultCUMask(for case2) will be returned
+    std::vector<uint32_t> streamCUMask;
+    streamCUMask = reinterpret_cast<hip::Stream*>(stream)->GetCUMask();
+    std::vector<uint32_t> mask = {};
+    if (info.globalCUMask_.size() != 0) {
+      for (uint32_t i = 0; i < std::min(streamCUMask.size(), info.globalCUMask_.size()); i++) {
+        mask.push_back(streamCUMask[i] & info.globalCUMask_[i]);
+      }
+    } else {
+      for (uint32_t i = 0; i < std::min(streamCUMask.size(), defaultCUMask.size()); i++) {
+        mask.push_back(streamCUMask[i] & defaultCUMask[i]);
+      }
+      // check to make sure after ANDing streamCUMask (custom-defined) with global CU mask,
+      //we have non-zero mask, oterwise just return either globalCUMask_ or defaultCUMask
+      bool zeroCUMask = true;
+      for (auto m : mask) {
+        if (m != 0) {
+          zeroCUMask = false;
+          break;
+        }
+      }
+      if (zeroCUMask) {
+        mask = (info.globalCUMask_.size() != 0) ? info.globalCUMask_ : defaultCUMask;
+      }
+      std::copy(mask.begin(), mask.end(), cuMask);
+    }
+  }
+  HIP_RETURN(hipSuccess);
+}
\ No newline at end of file