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diff --git a/camera/QCamera2/HAL3/QCamera3Mem.h b/camera/QCamera2/HAL3/QCamera3Mem.h
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+++ b/camera/QCamera2/HAL3/QCamera3Mem.h
@@ -0,0 +1,158 @@
+/* Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __QCAMERA3HWI_MEM_H__
+#define __QCAMERA3HWI_MEM_H__
+
+// System dependencies
+#include <linux/msm_ion.h>
+#include <utils/Mutex.h>
+
+// Camera dependencies
+#include "camera3.h"
+
+extern "C" {
+#include "mm_camera_interface.h"
+}
+
+using namespace android;
+
+namespace qcamera {
+
+// Base class for all memory types. Abstract.
+class QCamera3Memory {
+
+public:
+    int cleanCache(uint32_t index)
+    {
+        return cacheOps(index, ION_IOC_CLEAN_CACHES);
+    }
+    int invalidateCache(uint32_t index)
+    {
+        return cacheOps(index, ION_IOC_INV_CACHES);
+    }
+    int cleanInvalidateCache(uint32_t index)
+    {
+        return cacheOps(index, ION_IOC_CLEAN_INV_CACHES);
+    }
+    int getFd(uint32_t index);
+    ssize_t getSize(uint32_t index);
+    uint32_t getCnt();
+
+    virtual int cacheOps(uint32_t index, unsigned int cmd) = 0;
+    virtual int getMatchBufIndex(void *object) = 0;
+    virtual void *getPtr(uint32_t index) = 0;
+
+    virtual int32_t markFrameNumber(uint32_t index, uint32_t frameNumber) = 0;
+    virtual int32_t getFrameNumber(uint32_t index) = 0;
+    virtual int32_t getBufferIndex(uint32_t frameNumber) = 0;
+
+    QCamera3Memory();
+    virtual ~QCamera3Memory();
+
+    int32_t getBufDef(const cam_frame_len_offset_t &offset,
+            mm_camera_buf_def_t &bufDef, uint32_t index);
+
+protected:
+    struct QCamera3MemInfo {
+        int fd;
+        int main_ion_fd;
+        ion_user_handle_t handle;
+        size_t size;
+    };
+
+    int cacheOpsInternal(uint32_t index, unsigned int cmd, void *vaddr);
+    virtual void *getPtrLocked(uint32_t index) = 0;
+
+    uint32_t mBufferCount;
+    struct QCamera3MemInfo mMemInfo[MM_CAMERA_MAX_NUM_FRAMES];
+    void *mPtr[MM_CAMERA_MAX_NUM_FRAMES];
+    int32_t mCurrentFrameNumbers[MM_CAMERA_MAX_NUM_FRAMES];
+    Mutex mLock;
+};
+
+// Internal heap memory is used for memories used internally
+// They are allocated from /dev/ion. Examples are: capabilities,
+// parameters, metadata, and internal YUV data for jpeg encoding.
+class QCamera3HeapMemory : public QCamera3Memory {
+public:
+    QCamera3HeapMemory(uint32_t maxCnt);
+    virtual ~QCamera3HeapMemory();
+
+    int allocate(size_t size);
+    int allocateOne(size_t size);
+    void deallocate();
+
+    virtual int cacheOps(uint32_t index, unsigned int cmd);
+    virtual int getMatchBufIndex(void *object);
+    virtual void *getPtr(uint32_t index);
+
+    virtual int32_t markFrameNumber(uint32_t index, uint32_t frameNumber);
+    virtual int32_t getFrameNumber(uint32_t index);
+    virtual int32_t getBufferIndex(uint32_t frameNumber);
+
+protected:
+    virtual void *getPtrLocked(uint32_t index);
+private:
+    int allocOneBuffer(struct QCamera3MemInfo &memInfo,
+            unsigned int heap_id, size_t size);
+    void deallocOneBuffer(struct QCamera3MemInfo &memInfo);
+    uint32_t mMaxCnt;
+};
+
+// Gralloc Memory shared with frameworks
+class QCamera3GrallocMemory : public QCamera3Memory {
+public:
+    QCamera3GrallocMemory(uint32_t startIdx);
+    virtual ~QCamera3GrallocMemory();
+
+    int registerBuffer(buffer_handle_t *buffer, cam_stream_type_t type);
+    int32_t unregisterBuffer(size_t idx);
+    void unregisterBuffers();
+    virtual int cacheOps(uint32_t index, unsigned int cmd);
+    virtual int getMatchBufIndex(void *object);
+    virtual void *getPtr(uint32_t index);
+
+    virtual int32_t markFrameNumber(uint32_t index, uint32_t frameNumber);
+    virtual int32_t getFrameNumber(uint32_t index);
+    virtual int32_t getBufferIndex(uint32_t frameNumber);
+
+    void *getBufferHandle(uint32_t index);
+protected:
+    virtual void *getPtrLocked(uint32_t index);
+private:
+    int32_t unregisterBufferLocked(size_t idx);
+    int32_t getFreeIndexLocked();
+    buffer_handle_t *mBufferHandle[MM_CAMERA_MAX_NUM_FRAMES];
+    struct private_handle_t *mPrivateHandle[MM_CAMERA_MAX_NUM_FRAMES];
+
+    uint32_t mStartIdx;
+};
+};
+#endif