Convert CUDA Pointer To DMA buffer

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

Hi guys,
I need an example code that convert CUDA pointer (comes from cudaMalloc ) to DMA buffer (NvBuffer). I know that NvEGLImageFromFd, cuGraphicsEGLRegisterImage, cuGraphicsResourceGetMappedEglFrame used for DMA CUDA interoperability. But how about CUDA pointer to DMA buffer without copy.
Thanks so much.

3

Hi,

CUDA buffer is not accessible by the CPU.
So memcopy is required in this use case.

Thanks.

4

Thanks for your attention,
We already have CUDA-DMA inter-operablity which means a DMA buffer can be accessed through NvEGLImageFromFd, cuGraphicsEGLRegisterImage, cuGraphicsResourceGetMappedEglFrame in CUDA. What I need is the inverse access. That is I want a CUDA buffer pointer converted to a DMA file descriptor without copy.
Thanks so much.

5

Hi,

You will need a memory copy in this use case.
Thanks.

7

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