[Intel-gfx] [PATCH 3/3] drm/i915: Force sync command ordering

[Ben Widawsky]

On Tue, 11 Oct 2011 11:31:56 -0700
Ben Widawsky <ben at bwidawsk.net> wrote:

> This will strongly order synchronization commands with respect to 3d
> state and 3d primitive commands. AFAIK, this shouldn't impact anything
> as these sync commands are all for privileged (or ppgtt) batches only,
> so user space should not be relying on this, and the kernel wouldn't be
> relying on 3d state or primitive commands.
> 
> This will help when we enable PPGTT, and perhaps this synchronization is
> currently useful and I just don't realize it.
> 
> This was found through doc inspection by Ken and applies to Gen6+;
> 
> Reported-by: Kenneth Graunke <kenneth at whitecape.org>
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> ---
What I forgot to mention is certain docs say this bit must be set.