how to realize multi stage buffer copy

[cery999]

hi,
our device just can compute on device_l1_buffer

if use gpu, one can use .copy_to_device, to indicate that buffer copy from host to device.
however gpu can compute their data at GPU_L2_memory . while in our case, if use copy to device the data only can insert to device_l3_memory, but compute can only happen at device_l1_memory.

how can I inject host->device_l3_memory -> device_l2_memory -> device_l1_memory( pure compute function)

thanks for kindly help.