On Mon, Aug 25, 2014 at 12:02:09PM -0700, Derek wrote: > Hi, Daniel > Thanks for your response! > Talking about v4l's virtual gpu driver? Could you please tell some more > informations. is this driver in > git.linuxtv.org/cgit.cgi/media_tree.git > I want to take a look this driver. but I can't find it in their git > repository. Or is there any introduction post related this driver? Thanks. It isn't merged yet afaik, but Hans Verkuil has made a nice presentation about it at LinuxCon. Unfortunately the linuxcon page doesn't even have the slides afaics. http://lccona14.sched.org/event/2e156d3ce84309b2932f2e7a512904e0#.U_xCcjSmXmE The driver was called vidid (there's an older one called vidi apparently). But I don't think it's a good model for a virtual drm driver, if that's why you want to look at it. Just mentioned it to show that there's lots of uses for virtual drivers. -Daniel > > Best wishes > Derek > > > On Mon, Aug 25, 2014 at 6:12 AM, Daniel Vetter <daniel@xxxxxxxx> wrote: > > > On Mon, Aug 18, 2014 at 03:35:16PM -0700, Derek wrote: > > > Hi every one > > > I'm currently working on VirtualMonitor in my leisure time. It allows you > > > to use compute/tablet/smartphone as a second monitor for your primary > > > computer. please refer to http://virtualmonitor.github.io for more > > > information. Currently I have released very basic version for > > > windows2000-windows7 to demonstrate the project is feasible. When I was > > > trying to make a further step on windows, I realized it is difficult for > > an > > > individual, as it is not open source and also without technical support > > > from Microsoft. > > > > > > Then I want to move to linux, and I found Ilija Hadzic's post about > > Virtual > > > CRTCs. his post is here: > > > > > http://lists.freedesktop.org/archives/dri-devel/2011-November/015975.html > > > In his implementation, GPU driver can create arbitrary number of CRTCs > > > (configurable by user) instead of only those CRTCs that represent real > > > hardware. > > > It is very useful not only for VirtualMonitor, but also > > > VNC/Virtualization/USB display etc. based on this implementation those > > > application will be able to take full advantage of the physical graphic > > > card(3D acceleration). > > > > > > I want raise Ilijia's original question agian, if anybody in this > > community > > > think Virtual CRTCs is useful, and willing to work together to make a > > > further progress. > > > My thought is if can implement a driver independent layer between dri and > > > vendor specific GPU driver, with some general API. maybe implement this > > > based one vendor related GPU first? e.g. based on Ilijia's implementation > > > for Radeon as a daemon? > > > > > > GPU driver is not my expertise, If some expert from this community think > > > this feature is interesting, and willing to initiate a project for this > > > feature, that will be great. Then people can work and discuss together. > > > > > > Any comments regarding to Virtual CRTC or VirtualMonitor are very > > welcome. > > > Thanks. > > > > I think the concept is overall sound (haven't looked at the old patches in > > detail).For the actual implementation I think a separate virtual drm > > driver is now > > the better approach, since with dma-buf and soon native fence support we > > can do this now properly. > > > > And especially now that we have multi-gpu support in X it should integrate > > almost seamlessly into X (and other display managers with multi-gpu > > support). Instead of requering special support in all drivers. > > > > Another thing for which iirc no one ever proposed a decent solution is > > synchronization to consumers of the frontbuffers for virtual gpus. So I > > guess the driver-private ioctl interface to make that magic work will be > > key. > > > > A (configurable) virtual gpu should also be really useful for automated > > testing, e.g. of hot-plug and unplug (both drm core and userspace). The > > v4l folks have such a driver (recently massively revamped for 3.18) and it > > looks extremely useful. > > > > For the configuration interface I guess a few simple module options to get > > started should be enough, eventually we can switch to configfs (or > > similar) to be able to configure and create/destroy virtual gpus at > > runtime. > > > > Just my random thoughts, probably good to kickstart the discussion with > > some quick patches and chat with people on #dri-devel on freenode irc. > > > > Cheers, Daniel > > -- > > Daniel Vetter > > Software Engineer, Intel Corporation > > +41 (0) 79 365 57 48 - http://blog.ffwll.ch > > -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
