[Intel-gfx] [RFC 4/4] drm/i915: Expose RPS thresholds in sysfs

[Rodrigo Vivi]

On Fri, Apr 28, 2023 at 09:44:53AM +0100, Tvrtko Ursulin wrote:
> 
> On 28/04/2023 09:14, Tvrtko Ursulin wrote:
> > From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> > 
> > User feedback indicates significant performance gains are possible in
> > specific games with non default RPS up/down thresholds.
> > 
> > Expose these tunables via sysfs which will allow users to achieve best
> > performance when running games and best power efficiency elsewhere.
> > 
> > Note this patch supports non GuC based platforms only.
> > 
> > Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> > References: https://gitlab.freedesktop.org/drm/intel/-/issues/8389
> 
> [snip]
> 
> > diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
> > index a5a7315f5ace..f790e81546ff 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_rps.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_rps.c
> > @@ -2588,7 +2588,12 @@ static int rps_set_threshold(struct intel_rps *rps, u8 *threshold, u8 val)
> >   	ret = mutex_lock_interruptible(&rps->lock);
> >   	if (ret)
> >   		return ret;
> > -	*threshold = val;
> > +	if (*threshold != val) {
> > +		*threshold = val;
> > +		intel_rps_set(rps, clamp(rps->cur_freq,
> > +					 rps->min_freq_softlimit,
> > +					 rps->max_freq_softlimit));
> > +	}
> >   	mutex_unlock(&rps->lock);
> >   	return 0;
> 
> This hunk belongs to a previous patch - moved locally.

I probably missed something then becuase I didn't miss this in any
of the previous patches. To the point that this looked like a new
separated patch.

> 
> Regards,
> 
> Tvrtko