Can I create a opencl buffer from a GraphicBuffer or a raw ion buffer

Hi Anthony,

     Thanks, I am implementing zero copy scheme for a camera frame processing framework, the gpu driver seems to be a r5p0 release, and I have no way to upgrade the driver. Would you please show me some magic code, so that my own version clImportMemoryARM would work for me? Since zero copy would be very important for performance.

Thanks,

Songmao

Hi Anthony,

     Thanks, I am implementing zero copy scheme for a camera frame processing framework, the gpu driver seems to be a r5p0 release, and I have no way to upgrade the driver. Would you please show me some magic code, so that my own version clImportMemoryARM would work for me? Since zero copy would be very important for performance.

Thanks,

Songmao

Hi songmao,

Here is how to use this extension:

      #define WIDTH  1024

      #define HEIGHT 512

      // Create buffer to be used as a hardware texture with graphics APIs (can also

      // include video/camera use flags here)

      int dma_buf_handle = get_dma_buf_handle_from_exporter_kernel_module( ..., WIDTH * HEIGHT * 2 );

      cl_int error = CL_SUCCESS;

      cl_mem buffer = clImportMemoryARM( ctx,

                                         CL_MEM_READ_WRITE,

                                         { CL_IMPORT_TYPE_ARM, CL_IMPORT_TYPE_DMA_BUF_ARM, 0 },

                                         &dma_buf_handle

                                         WIDTH * HEIGHT * 2,

                                         &error );

      if( error == CL_SUCCESS )

      {

          // Use <buffer> as you would any other cl_mem buffer

      }

However, without a more recent revision of the driver (>= r7p0) you won't be able to use it, sorry.

Regards,

Anthony

thx, I see, and I have another popular platform, rk3288.

Will the driver have a update to >= r7p0?

http://malideveloper.arm.com/resources/drivers/arm-mali-midgard-gpu-user-space-drivers/

And would you please suggest some opensource benchmark to evaluate the gpu/opencl performance?

Thanks,

Songmao

Hi songmao,

guillaume.tucker is preparing a release of an updated driver for the Firefly. It should be soon.

Kind Regards,

Michael McGeagh

Thanks, Michael and Anthony, Thanks for your help.

Songmao