On Wed, Sep 21, 2016 at 06:23:35PM +0200, Christian König wrote: > For a quick workaround I suggest to just serialize all accesses to BO shared > with different drivers, but essentially I think it is a perfectly valid > requirement to have multiple writers to one BO.
It is, but it's not possible with implicit sync. If you want parallel write access to the same shared buffer, you _must_ carry around some explicit fences. Within amdgpu you can use driver-specific cookies, for shared buffer we now have sync_file. But multiple writers with implicit sync simply fundamentally doesn't work. Because you have no idea with which writer, touching the same subrange you want to touch. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch
