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 <Dieter@xxxxxxxxxxxxx>:
>
> 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@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
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