<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <meta name="Generator" content="Microsoft Exchange Server"> <style></style> </head> <body> <div> <div dir="auto">This is work in progress. <div dir="auto"><br> </div> <div dir="auto">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.</div> <div dir="auto"><br> </div> <div dir="auto">I can prepare you a branch based on current upstream kernel next week if you want to test this.</div> <div dir="auto"><br> </div> <div dir="auto">Regards,</div> <div dir="auto">Christian.</div> </div> <div class="x_gmail_extra"><br> <div class="x_gmail_quote">Am 29.09.2018 09:01 schrieb Dirk Eibach <dirk.eibach@googlemail.com>:<br type="attribution"> </div> </div> </div> <font size="2"><span style="font-size:11pt;"> <div class="PlainText">I want to access GPU VRAM via PCIe P2P access, like DirectGMA but with<br> mainline drivers.<br> I can acquire a dmabuf from the GPU and pass it to my PCIe<br> framegrabber. But I don't see a way to get the PCIe bus address of the<br> video memory which I need for the P2P transfer. Is there already any<br> infrastructure in place for doing this? If not, what would be the<br> right way to implement this? Add another callback to the dmabuf<br> struct?<br> <br> Cheers<br> Dirk<br> </div> </span></font> </body> </html>