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Problems about zero copy clImportMemoryARM

m.x

Hi

    I am trying to malloc a buffer and use it to achieve zero copy between cpu and mali gpu. The device is Redmi Note8pro, Mali G76 MC4, opencl 2.1, ddk

Opencl 2.1 v1.r20p0-01rel0.a41d1d553047de7edc8f79dbe3e575cd, android 10. The cl extension include cl_arm_import_memory_host. The code snippet is shown below:  

int8_t* src = new int8_t[256];
const cl_import_properties_arm import_properties[] =
{
	CL_IMPORT_TYPE_ARM,
    CL_IMPORT_TYPE_HOST_ARM,
    0
};
cl_int errNum;
cl_mem d_src = clImportMemoryARM(context, CL_MEM_READ_WRITE, import_properties, src, 256, &errNum);

  However, the value of d_src is 0x0, and the cl kernel will crash if access the d_src. 

  Would you please help with the issue? Thanks

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  • +1 Arm Employee Badge in reply to m.x

    Weird indeed. Looking at the source code, this doesn't seem to be possible. Do you still have this issue?

    Do you really need imported memory in your application? If you are in control of the producer code, nothing prevents you from creating a buffer and mapping it for initialisation. This will not result in a copy.

    In case you do need imported memory, do you have access to Arm support?

    Regards,

    Kevin

Reply
  • +1 Arm Employee Badge in reply to m.x

    Weird indeed. Looking at the source code, this doesn't seem to be possible. Do you still have this issue?

    Do you really need imported memory in your application? If you are in control of the producer code, nothing prevents you from creating a buffer and mapping it for initialisation. This will not result in a copy.

    In case you do need imported memory, do you have access to Arm support?

    Regards,

    Kevin

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