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 Vetter
Software Engineer, Intel Corporation
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