PCIe P2P access to GPU memory

[Koenig, Christian]

This is work in progress.

I published patches to enable DMA_buf P2P a few months ago, but now I'm waiting for the PCI subsystem to pick up core support for this.

I can prepare you a branch based on current upstream kernel next week if you want to test this.

Regards,
Christian.

Am 29.09.2018 09:01 schrieb Dirk Eibach <dirk.eibach at googlemail.com>:
I want to access GPU VRAM via PCIe P2P access, like DirectGMA but with
mainline drivers.
I can acquire a dmabuf from the GPU and pass it to my PCIe
framegrabber. But I don't see a way to get the PCIe bus address of the
video memory which I need for the P2P transfer. Is there already any
infrastructure in place for doing this? If not, what would be the
right way to implement this? Add another callback to the dmabuf
struct?

Cheers
Dirk
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