Hi Christian,
Could I simply force it by overwriting peer2peer after the attach call?
Cheers
Dirk
> Hi Dirk,
>
> > Any ideas?
> Could be anything. Most likely cause is that some function things the
> two device can't communicate directly with each other.
>
> Please provide a full dmesg and "lspci -t -nn -v" as attachment and note
> which devices should communicate with which.
>
> I'm currently on vacation so it could take a while till I have time to
> look deeper into this.
>
> Christian.
>
> Am 01.10.2018 um 15:07 schrieb Dirk Eibach:
> > Hi Christian,
> >
> > I took the repository Dieter suggested and gave it a spin. I am not
> > sure, if I got the API right.
> >
> > In userspace I create a bo and get a fd.
> > bo = gbm_bo_create(gbm, w, h, GBM_FORMAT_ARGB8888, GBM_BO_USE_LINEAR);
> > dmabuf_fd = gbm_bo_get_fd(bo);
> >
> > Then I pass the fd to the grabber driver. There I get a sgt, that I
> > want to pass to the DMA-machine.
> > struct dma_buf_attach_info dma_buf_attach_info = {
> > .dev = &engine->xdev->pdev->dev,
> > .peer2peer = true,
> > };
> > dma_buf = dma_buf_get(xdma_dma_buf_ioctl.dma_buf_fd);
> > dma_buf_attach_info.dmabuf = dma_buf;
> > dma_buf_attachment = dma_buf_attach(&dma_buf_attach_info);
> > sgt = dma_buf_map_attachment(dma_buf_attachment, DMA_TO_DEVICE);
> >
> > But the addresses in the sgt do not look like PCIe addresses at at all.
> >
> > Any ideas?
> >
> > Cheers
> > Dirk
> > Am Sa., 29. Sep. 2018 um 11:53 Uhr schrieb Dieter Nützel <
> die...@nuetzel-hh.de>:
> >> Hello Dirk,
> >>
> >> I think Christian is talking about this branch:
> >>
> >> https://cgit.freedesktop.org/~deathsimple/linux/log/?h=p2p
> >>
> >> His 'home' is, here:
> >> https://cgit.freedesktop.org/~deathsimple/linux/
> >>
> >> Happy hacking! ;-)
> >>
> >> Dieter
> >>
> >> Am 29.09.2018 10:17, schrieb Dirk Eibach:
> >>>> 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.
> >>> Great news! Can you give me a link to this series so I can already have
> >>> a look?
> >>>
> >>>> I can prepare you a branch based on current upstream kernel next week
> >>>> if you want to test this.
> >>> That would be awesome, thanks.
> >>>
> >>> Cheers
> >>> Dirk
> >>> _______________________________________________
> >>> dri-devel mailing list
> >>> dri-devel@lists.freedesktop.org
> >>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
>
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