[Intel-gfx] [RFC 0/2] slice shutdown debugfs interface for Gen8/Gen9

[Chris Wilson]

On Fri, Apr 07, 2017 at 06:55:27AM -0700, Dmitry Rogozhkin wrote:
> Starting from Gen8 HW supports dynamic power on/off slices. This
> permits to free power budget and may dramatically affect performance.
> This patch series suggests an interface (debugfs) to permit user to
> setup number of active slices. Interface can be used in performance
> investigations targeting scalability across hw platforms.
> 
> Dmitry Rogozhkin (2):
>   drm/i915/skl: add slice shutdown debugfs interface
>   drm/i915/bdw: permit make_rpcs execution on BDW to enable slice
>     shutdown

Lgtm, but I haven't used the slices extensively myself so I'd like a
second opinion on whether this is valid (that we can program the slices
to an arbitrary value). And if so, is there any reason why userspace
wouldn't want to be able to select its own slices?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre