Host Memory Copy Buffer XRT (XRT Native API’s)

This is simple host memory example to describe how host-only memory can be copied to device-only memory and vice-versa using XRT Native API’s.

KEY CONCEPTS: host memory

KEYWORDS: host_only, device_only, HOST[0]

This example illustrates how host only memory can be copied to device only memory and vice-versa using native xrt copy API.

Host only buffer is created using host_only flag whereas device only buffer is created using device_only flag. The following data transfers take place in the example -

  1. Copy the host_only input buffer hostonly_bo into DEVICE_ONLY input buffer deviceonly_bo using M2M.

deviceonly_bo0.copy(hostonly_bo0);
deviceonly_bo1.copy(hostonly_bo1);

  1. Enqueue kernel to do computations on DEVICE_ONLY input buffer deviceonly_bo and put output in device_only output buffer deviceonly_bo_out.

auto run = krnl(deviceonly_bo0, deviceonly_bo1, deviceonly_bo_out, DATA_SIZE);

  1. Copy the device_only output buffer deviceonly_bo_out into host_only output buffer hostonly_bo_out using M2M.

hostonly_bo_out.copy(deviceonly_bo_out);

EXCLUDED PLATFORMS

Platforms containing following strings in their names are not supported for this example :

_u25_
u30
u50c
u50lv
u50_gen3x4
u55
zc
vck
aws
2019
2018
samsung
u250
_u2_

DESIGN FILES

Application code is located in the src directory. Accelerator binary files will be compiled to the xclbin directory. The xclbin directory is required by the Makefile and its contents will be filled during compilation. A listing of all the files in this example is shown below

src/host.cpp
src/krnl_vadd.cpp

Access these files in the github repo by clicking here.

COMMAND LINE ARGUMENTS

Once the environment has been configured, the application can be executed by

./host_memory_copy_buffer_xrt -x <krnl_vadd XCLBIN>