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diff --git a/msm8909/gralloc/gr_buf_mgr.h b/msm8909/gralloc/gr_buf_mgr.h
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+++ b/msm8909/gralloc/gr_buf_mgr.h
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+/*
+ * Copyright (c) 2011-2017, The Linux Foundation. All rights reserved.
+ * Not a Contribution
+ *
+ * Copyright (C) 2008 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.
+ */
+
+#ifndef __GR_BUF_MGR_H__
+#define __GR_BUF_MGR_H__
+
+#include <pthread.h>
+#include <unordered_map>
+#include <unordered_set>
+#include <utility>
+#include <mutex>
+
+#include "gralloc_priv.h"
+#include "gr_allocator.h"
+#include "gr_buf_descriptor.h"
+
+namespace gralloc1 {
+
+class BufferManager {
+ public:
+  ~BufferManager();
+  gralloc1_error_t CreateBufferDescriptor(gralloc1_buffer_descriptor_t *descriptor_id);
+  gralloc1_error_t DestroyBufferDescriptor(gralloc1_buffer_descriptor_t descriptor_id);
+  gralloc1_error_t AllocateBuffers(uint32_t num_descriptors,
+                                   const gralloc1_buffer_descriptor_t *descriptor_ids,
+                                   buffer_handle_t *out_buffers);
+  gralloc1_error_t RetainBuffer(private_handle_t const *hnd);
+  gralloc1_error_t ReleaseBuffer(private_handle_t const *hnd);
+  gralloc1_error_t LockBuffer(const private_handle_t *hnd, gralloc1_producer_usage_t prod_usage,
+                              gralloc1_consumer_usage_t cons_usage);
+  gralloc1_error_t UnlockBuffer(const private_handle_t *hnd);
+  gralloc1_error_t Perform(int operation, va_list args);
+  gralloc1_error_t GetFlexLayout(const private_handle_t *hnd, struct android_flex_layout *layout);
+  gralloc1_error_t GetNumFlexPlanes(const private_handle_t *hnd, uint32_t *out_num_planes);
+  gralloc1_error_t Dump(std::ostringstream *os);
+
+  template <typename... Args>
+  gralloc1_error_t CallBufferDescriptorFunction(gralloc1_buffer_descriptor_t descriptor_id,
+                                                void (BufferDescriptor::*member)(Args...),
+                                                Args... args) {
+    std::lock_guard<std::mutex> lock(descriptor_lock_);
+    const auto map_descriptor = descriptors_map_.find(descriptor_id);
+    if (map_descriptor == descriptors_map_.end()) {
+      return GRALLOC1_ERROR_BAD_DESCRIPTOR;
+    }
+    const auto descriptor = map_descriptor->second;
+    (descriptor.get()->*member)(std::forward<Args>(args)...);
+    return GRALLOC1_ERROR_NONE;
+  }
+
+  static BufferManager* GetInstance() {
+    static BufferManager *instance = new BufferManager();
+    return instance;
+  }
+
+ private:
+  BufferManager();
+  gralloc1_error_t MapBuffer(private_handle_t const *hnd);
+  int GetBufferType(int format);
+  int AllocateBuffer(const BufferDescriptor &descriptor, buffer_handle_t *handle,
+                     unsigned int bufferSize = 0);
+  uint32_t GetDataAlignment(int format, gralloc1_producer_usage_t prod_usage,
+                       gralloc1_consumer_usage_t cons_usage);
+  int GetHandleFlags(int format, gralloc1_producer_usage_t prod_usage,
+                     gralloc1_consumer_usage_t cons_usage);
+  void CreateSharedHandle(buffer_handle_t inbuffer, const BufferDescriptor &descriptor,
+                          buffer_handle_t *out_buffer);
+
+  // Imports the ion fds into the current process. Returns an error for invalid handles
+  gralloc1_error_t ImportHandleLocked(private_handle_t *hnd);
+
+  // Creates a Buffer from the valid private handle and adds it to the map
+  void RegisterHandleLocked(const private_handle_t *hnd, int ion_handle, int ion_handle_meta);
+
+  // Wrapper structure over private handle
+  // Values associated with the private handle
+  // that do not need to go over IPC can be placed here
+  // This structure is also not expected to be ABI stable
+  // unlike private_handle_t
+  struct Buffer {
+    const private_handle_t *handle = nullptr;
+    int ref_count = 1;
+    // Hold the main and metadata ion handles
+    // Freed from the allocator process
+    // and unused in the mapping process
+    int ion_handle_main = -1;
+    int ion_handle_meta = -1;
+
+    Buffer() = delete;
+    explicit Buffer(const private_handle_t* h, int ih_main = -1, int ih_meta = -1):
+        handle(h),
+        ion_handle_main(ih_main),
+        ion_handle_meta(ih_meta) {
+    }
+    void IncRef() { ++ref_count; }
+    bool DecRef() { return --ref_count == 0; }
+  };
+
+  gralloc1_error_t FreeBuffer(std::shared_ptr<Buffer> buf);
+
+  // Get the wrapper Buffer object from the handle, returns nullptr if handle is not found
+  std::shared_ptr<Buffer> GetBufferFromHandleLocked(const private_handle_t *hnd);
+
+  bool map_fb_mem_ = false;
+  Allocator *allocator_ = NULL;
+  std::mutex buffer_lock_;
+  std::mutex descriptor_lock_;
+  // TODO(user): The private_handle_t is used as a key because the unique ID generated
+  // from next_id_ is not unique across processes. The correct way to resolve this would
+  // be to use the allocator over hwbinder
+  std::unordered_map<const private_handle_t*, std::shared_ptr<Buffer>> handles_map_ = {};
+  std::unordered_map<gralloc1_buffer_descriptor_t,
+                     std::shared_ptr<BufferDescriptor>> descriptors_map_ = {};
+  std::atomic<uint64_t> next_id_;
+};
+
+}  // namespace gralloc1
+
+#endif  // __GR_BUF_MGR_H__