Am 03.10.2018 um 11:06 schrieb Daniel Vetter:
On Wed, Oct 03, 2018 at 08:54:44AM +0000, Koenig, Christian wrote:
Am 03.10.2018 um 09:14 schrieb Daniel Vetter:
On Sat, Sep 29, 2018 at 9:27 AM Koenig, Christian
<Christian.Koenig@xxxxxxx> wrote:
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.
Thread hijack, since I just read the lwn article on p2p for storage folks:
https://lwn.net/Articles/767281/
Totally doesn't match what I remember of your dma-buf p2p work. Do we
need to rework, or is this some kind of higher-level interface on top
of the raw p2p pci stuff? Or do I misremember.
The P2P from the storage folks are some mix of raw p2p capability
detection for PCI and higher level interface.
I'm actually waiting for that stuff to land to extract the p2p
capability detection and use it for this DMA-buf stuff as well.
Alternative would be to convince Logan to extract the capability
detection in his patch set as well, but so far he wasn't very keen about
that.
So no plan to make dma-buf some kind of orchestrator and use the p2p
map_sg stuff?
Not sure about that yet. Didn't had time to take a closer look.
Christian.
That seems to be the new/additional bits I haven't seen yet,
and I'm wondered how we should fit dma-buf into that picture.
-Daniel
Christian.
Thanks, Daniel
Regards,
Christian.
Am 29.09.2018 09:01 schrieb Dirk Eibach <dirk.eibach@xxxxxxxxxxxxxx>:
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
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
