On Fri, Dec 4, 2015 at 12:40 PM, Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx> wrote: > Hi Rob, > > I got the same problem today with sti drm/kms driver and dumb Bo. > The issue comes become hwcomposer because is the master and authenticated on > /dev/dri/cardX > Dumb allocation is done by gralloc which does a new open (so it is not > authenticated) on drm node the consequence is that we can't use prime > functions... > If you use render node you won't be able to call dumb functions. > > To get out of this I think I will implement additional helpers in gem_cma to > have ioctl like DRM_GEM_CMA_CREATE and DRM_GEM_CMA_MMAP > and call them instead of dumb so be able to use render node. > Of course it is only for drivers which already use gem_cma helpers (like > sti) That's only marginally better than per driver BO calls which is the whole thing I'm trying to avoid. There should be some way to pass the auth token to gralloc? Rob > > Benjamin > > > Le vendredi 4 décembre 2015, Martin Peres <martin.peres@xxxxxxxxxxxxxxx> a > écrit : >> >> On 04/12/15 19:49, Rob Herring wrote: >>> >>> I'm working on getting Android working with DRM drivers. ATM, I'm >>> using virtio-gpu as the driver and trying to get just KMS side working >>> without rendering. I have it working with stock AOSP and the emulated >>> fb with a few additions to the virtio-gpu driver[1]. Now I'm trying to >>> get things working with native KMS using drm_gralloc and >>> drm_hwcomposer (now in AOSP). I've hit one problem though which I'm >>> not sure how to solve without hacking around it. >>> >>> Is prime allowed on dumb BOs? AIUI, dumb buffer allocation is not >>> allowed on render nodes and drmPrimeHandleToFD is not allowed on >>> card0, so I'm stuck. I could open both nodes, but then I want the case >>> of no render node to work. After some searching, I thought it was a >>> matter of needing to do drmAuthMagic, but then found that is >>> considered obsolete[2]. >> >> >> Obsolete when using render nodes, but still necessary on usual nodes >> (/dev/dri/cardX) as far as I remember. The usual nodes can do everything the >> render nodes can do. >> >> Authentication should help! Please make sure you are master or >> authenticated before doing anything on the usual nodes. >> >>> >>> Rob >>> >>> [1] git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git >>> android-4.4 >>> [2] >>> http://www.x.org/wiki/Events/XDC2013/XDC2013DavidHerrmannDRMSecurity/slides.pdf >>> _______________________________________________ >>> dri-devel mailing list >>> dri-devel@xxxxxxxxxxxxxxxxxxxxx >>> http://lists.freedesktop.org/mailman/listinfo/dri-devel >>> > > > -- > > Benjamin Gaignard > > Graphic Working Group > > Linaro.org │ Open source software for ARM SoCs > > Follow Linaro: Facebook | Twitter | Blog > > _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
