Hi Gerd, >-----Original Message----- >From: intel-gvt-dev [mailto:[email protected]] On >Behalf Of Gerd Hoffmann >Sent: Friday, May 19, 2017 4:57 PM >To: Chen, Xiaoguang <[email protected]> >Cc: Tian, Kevin <[email protected]>; [email protected]; >[email protected]; Alex Williamson <[email protected]>; Lv, >Zhiyuan <[email protected]>; [email protected]; Wang, Zhi >A <[email protected]> >Subject: Re: [RFC PATCH 6/6] drm/i915/gvt: support QEMU getting the dmabuf > > Hi, > >> >We could also do it the other way around: Instead of having the >> >kernel returning >> >> >the plane description userspace could pass it in, and the kernel >> >throws -EINVAL in >> >> >case it doesn't match due to things having changed meanwhile. >> >> Or just return a dmabuf based on the current plane ? > >If gvt is able to hand out dma-bufs for inactive planes, then yes, we can do >this. >Have one ioctl where we pass in the plane id, get back a plane description >struct, >and another where we pass in the plane description struct and get back a dma- >buf fd. Or more simply just pass the plane id, because even the plane description did not match the current one we will eventually create a dmabuf based on current plane.
> >cheers, > Gerd > >_______________________________________________ >intel-gvt-dev mailing list >[email protected] >https://lists.freedesktop.org/mailman/listinfo/intel-gvt-dev
