calling cl_arm_import_memory failed with error code -6 on RK3399

hey, I am new to OPENCL. bumped into an issue when we try to leverage the GPU for some math operations (basically matrix multiplication).

following is my sample code, 

char *allocptr = malloc(WIDTH*HEIGHT*2);

cl_mem buffer = clImportMemoryARM(context,CL_MEM_READ_WRITE, NULL,allocp$

if (error ==CL_SUCCESS)
{
    printf("sucess\n");
}
else
{
    printf("error %d\n.",error);
}

the code can be compiled without any issue, however it through out error -6 at run time. Can anyone shed some lights here?

the CLINFO is pasted below as well.

firefly@firefly:~$ sudo clinfo -a
Platform #0
  Name:                                  ARM Platform
  Vendor:                                ARM
  Version:                               OpenCL 1.2 v1.r14p0-01rel0-git(966ed26).f44c85cb3d2ceb87e8be88e7592755c3
  Profile:                               FULL_PROFILE
  Extensions:                            cl_khr_global_int32_base_atomics
                                         cl_khr_global_int32_extended_atomics
                                         cl_khr_local_int32_base_atomics
                                         cl_khr_local_int32_extended_atomics
                                         cl_khr_byte_addressable_store
                                         cl_khr_3d_image_writes
                                         cl_khr_fp64
                                         cl_khr_int64_base_atomics
                                         cl_khr_int64_extended_atomics
                                         cl_khr_fp16
                                         cl_khr_gl_sharing
                                         cl_khr_icd
                                         cl_khr_egl_event
                                         cl_khr_egl_image
                                         cl_khr_image2d_from_buffer
                                         cl_arm_core_id
                                         cl_arm_printf
                                         cl_arm_thread_limit_hint
                                         cl_arm_non_uniform_work_group_size
                                         cl_arm_import_memory

  Device #0
    Name:                                Mali-T860
    Type:                                GPU
    Vendor:                              ARM
    Vendor ID:                           140517376
    Profile:                             FULL_PROFILE
    Available:                           Yes
    Version:                             OpenCL 1.2 v1.r14p0-01rel0-git(966ed26).f44c85cb3d2ceb87e8be88e7592755c3
    Driver version:                      1.2
    Compiler available:                  Yes
    Address space size:                  64
    Little endian:                       Yes
    Error correction support:            No
    Address alignment (bits):            1024
    Smallest alignment (bytes):          128
    Resolution of timer (ns):            1000
    Max clock frequency (MHz):           200
    Max compute units:                   4
    Max constant args:                   8
    Max constant buffer size:            64 kB 
    Max mem alloc size:                  489 MB 942 kB 
    Max parameter size:                  1024
    Command-queue supported props:       Out of order execution
                                         Profiling
    Execution capabilities:              OpenCL kernels
    Global memory size:                  1 GB 935 MB 696 kB 
    Global memory cache size:            256 kB 
    Global memory line cache size:       64
    Local memory size:                   32 kB 
    Local memory type:                   Global
    Global memory cache type:            Read write
    Max work group size:                 256
    Max work item dimensions:            3
    Max work item sizes:                 (256, 256, 256)
    Image support:                       Yes
    Max 2D image height:                 65536
    Max 2D image width:                  65536
    Max 3D image depth:                  65536
    Max 3D image height:                 65536
    Max 3D image width:                  65536
    Max read image args:                 128
    Max write image args:                8
    Max samplers:                        16
    Preferred vector width char:         16
    Preferred vector width short:        8
    Preferred vector width int:          4
    Preferred vector width long:         2
    Preferred vector width float:        4
    Preferred vector width double:       2
    Half precision float capability:     Denorms
                                         Inf and NaNs
                                         Round to nearest even rounding mode
                                         Round to zero rounding mode
                                         Round to +ve and -ve infinity rounding modes
                                         IEEE754-2008 fused multiply-add
    Single precision float capability:   Denorms
                                         Inf and NaNs
                                         Round to nearest even rounding mode
                                         Round to zero rounding mode
                                         Round to +ve and -ve infinity rounding modes
                                         IEEE754-2008 fused multiply-add
    Double precision float capability:   Denorms
                                         Inf and NaNs
                                         Round to nearest even rounding mode
                                         Round to zero rounding mode
                                         Round to +ve and -ve infinity rounding modes
                                         IEEE754-2008 fused multiply-add
    Extensions:                          cl_khr_global_int32_base_atomics
                                         cl_khr_global_int32_extended_atomics
                                         cl_khr_local_int32_base_atomics
                                         cl_khr_local_int32_extended_atomics
                                         cl_khr_byte_addressable_store
                                         cl_khr_3d_image_writes
                                         cl_khr_fp64
                                         cl_khr_int64_base_atomics
                                         cl_khr_int64_extended_atomics
                                         cl_khr_fp16
                                         cl_khr_gl_sharing
                                         cl_khr_icd
                                         cl_khr_egl_event
                                         cl_khr_egl_image
                                         cl_khr_image2d_from_buffer
                                         cl_arm_core_id
                                         cl_arm_printf
                                         cl_arm_thread_limit_hint
                                         cl_arm_non_uniform_work_group_size
                                         cl_arm_import_memory

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