Question on using DMA Engine API with QEMU/KVM

[Garg, Shivank]

[Public]

Hi,

 

I have some questions on emulating a DMA hardware with QEMU.

I want to test some kernel code I wrote with core DMA Engine API (https://www.kernel.org/doc/Documentation/DMA-API-HOWTO.txt)

I’m getting an error while requesting the DMA channel.

Also, I don’t see any listed with /sys/class/dma/ as I have not added any DMA device.

 

Can QEMU support the emulate DMA device for testing the DMA APIs? How can I make one work?

 

I did not find any documentation regarding this. I found some details regarding device: “edu” but it’s giving same error when asking for  DMA channel.

 

Thanks,

Shivank