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 at lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/dri-devel >
