DMA to/from GPU memory

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin Nano
1

Hello,
This is with regards to Jetson Nano
I have a CUDA program that performs cudaHostAlloc(). The app. also sets CU_POINTER_ATTRIBUTE_SYNC_MEMOPS for this memory region. Further this memory is pinned using nvidia_p2p_get_pages and then mapped with nvidia_p2p_dma_map_pages. At a later stage a GPU updates this memory region and asks the host to DMA out of it.

If a device is going to DMA to/from this pinned memory is there a need to perform dma_sync_sg_for_{device,cpu} at the kernel level before and after outgoing and incoming DMA transfers to this region, respectively or can the region be considered coherent.

Thanks

3

Hi,

Just want to check do you use Orin Nano or Jetson Nano?

Our RDMA feature is not available for the Jetson Nano.
You will need to user a newer platform to get the support.

Below is the sample for your reference:

Thanks.

4

AstaLLL,

I am using a Orin Nano. Thank you pointing me to the sample.
Thanks.

5

Hi,

In our official sample, there is a cudaDeviceSynchronize call before DMA process.

Thanks.

6

AastaLLL,

Thank you for pointing that out. Truly, appreciate your input.

9

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