[Intel-gfx] [PATCH] drm/i915: Mention when we enable the Ironlake iommu workarounds

[Ben Widawsky]

On Mon, Dec 30, 2013 at 12:16:15PM +0000, Chris Wilson wrote:
> The iommu and gfx on Ironlake do not like each other and require a
> big hammer to prevent hard machine hangs. In
> 
> commit 5c0422878fcdc279ae9a8e8b66972a15b5efb67f
> Author: Ben Widawsky <ben at bwidawsk.net>
> Date:   Mon Oct 17 15:51:55 2011 -0700
> 
>     drm/i915: ILK + VT-d workaround
> 
> we added the workaround, but never emitted any debug message that it was
> active. Doing so should help identify known performance regressions.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Ben Widawsky <ben at bwidawsk.net>

[snip]

-- 
Ben Widawsky, Intel Open Source Technology Center