opencl - How to get physical address of GPU memory for DMA? (OpenCL)

Question

I am writing an OpenCL program and I wish to transfer data from a frame grabber to a GPU using DMA. How can I get the physical address of an OpenCL buffer on the GPU to do that?

Answer 1

使用 OpenCL，您无法获取缓冲区的物理 GPU 地址。

但是，您可以将缓冲区的一个区域直接映射到主机内存，从而允许使用标准 C/C++ 代码（例如 memcpy）将内存复制入和复制出。请参阅 clEnqueueMapBuffer。