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 <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
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