Please don't drop mailing lists, especially when you've dug out some good information like the stuff below. Readding dri-devel. -Danel On Wed, Aug 27, 2014 at 7:21 PM, Derek <derek0883@xxxxxxxxx> wrote: > Hi Daniel > Thanks, Hans Verkuil's git repository is here > git://linuxtv.org/hverkuil/media_tree.git. branch name vivid2. > his slide is here: > http://events.linuxfoundation.org/sites/events/files/slides/v4l2-testing.pdf > And I'm agree that it isn't for virtual drm driver. > > I found that there are two virtual drm driver in kernel source code. > first one is vmwgfx driver/gpu/drm/vmwgfx > according to > http://mesa3d.org/vmware-guest.html > This driver gives a Linux virtual machine access to the host's GPU for > hardware-accelerated 3D. > > another one is gxl drivers/gpu/drm/gxl > It is for readhat virtualization KVM + spice. > > and seems drm infrastructure support virtual driver already. just search > DRM_MODE_ENCODER_VIRTUAL/DRM_MODE_CONNECTOR_VIRTUAL > > both driver need user space XServer driver support. > > I will take a look these drivers find out if i can use similar driver to > create virtual CRTC based on drm without extra userspace xserver driver. and > develop a virtualMonitor which allow you to use compute, tablet, smartphone > as a second monitor for your primary computer. an example page is > http://virtualmonitor.github.io > > Thanks a lots > > Best wishes > Derek > > > > On Tue, Aug 26, 2014 at 1:18 AM, Daniel Vetter <daniel@xxxxxxxx> wrote: >> >> 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 > > -- 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
