diff --git a/graphics/mapper/2.1/IMapper.hal b/graphics/mapper/2.1/IMapper.hal
new file mode 100644
index 0000000..a23656d
--- /dev/null
+++ b/graphics/mapper/2.1/IMapper.hal
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.graphics.mapper@2.1;
+
+import android.hardware.graphics.mapper@2.0::Error;
+import android.hardware.graphics.mapper@2.0::IMapper;
+
+interface IMapper extends android.hardware.graphics.mapper@2.0::IMapper {
+    /**
+     * Validate that the buffer can be safely accessed by a caller who assumes
+     * the specified descriptorInfo and stride. This must at least validate
+     * that the buffer size is large enough. Validating the buffer against
+     * individual buffer attributes is optional.
+     *
+     * @param buffer is the buffer to validate against.
+     * @param descriptorInfo specifies the attributes of the buffer.
+     * @param stride is the buffer stride returned by IAllocator::allocate.
+     * @return error is NONE upon success. Otherwise,
+     *                  BAD_BUFFER when the buffer is invalid.
+     *                  BAD_VALUE when buffer cannot be safely accessed
+     */
+    validateBufferSize(pointer buffer,
+                       BufferDescriptorInfo descriptorInfo,
+                       uint32_t stride)
+            generates (Error error);
+
+    /**
+     * Get the transport size of a buffer. An imported buffer handle is a raw
+     * buffer handle with the process-local runtime data appended. This
+     * function, for example, allows a caller to omit the process-local
+     * runtime data at the tail when serializing the imported buffer handle.
+     *
+     * Note that a client might or might not omit the process-local runtime
+     * data when sending an imported buffer handle. The mapper must support
+     * both cases on the receiving end.
+     *
+     * @param buffer is the buffer to get the transport size from.
+     * @return error is NONE upon success. Otherwise,
+     *                  BAD_BUFFER when the buffer is invalid.
+     * @return numFds is the number of file descriptors needed for transport.
+     * @return numInts is the number of integers needed for transport.
+     */
+    getTransportSize(pointer buffer)
+            generates (Error error,
+                       uint32_t numFds,
+                       uint32_t numInts);
+};