[Skiboot] [PATCH] xive: Disable block tracker

[Benjamin Herrenschmidt]

On Wed, 2018-08-01 at 15:34 +0200, Cédric Le Goater wrote:
> On 08/01/2018 03:18 PM, Benjamin Herrenschmidt wrote:
> > Due to some HW errata, the block tracking facility (performance optimisation
> > for large systems) should be disabled on Nimbus chips. Disable it unconditionally
> > for now.
> > 
> > Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> > ---
> > diff --git a/hw/xive.c b/hw/xive.c
> > index f48d7a41..8245bbf4 100644
> > --- a/hw/xive.c
> > +++ b/hw/xive.c
> > @@ -1762,9 +1762,11 @@ static bool xive_config_init(struct xive *x)
> >  	val |= VC_SBC_CONF_NO_UPD_PRF;
> >  	xive_regw(x, VC_SBC_CONFIG, val);
> >  
> > -	/* Enable block tracking */
> > +	/* Disable block tracking on Nubus (we may want to enable
> 
> Nubus ? Isn't that a Macintosh Bus ? 

Typo :-) Make that Nimbus.
> 
> > +	 * it on Cumulus later). HW Erratas.
> > +	 */
> >  	val = xive_regr(x, PC_TCTXT_TRACK);
> > -	val |= PC_TCTXT_TRACK_EN;
> > +	val &= ~PC_TCTXT_TRACK_EN;
> >  	xive_regw(x, PC_TCTXT_TRACK, val);
> >  
> >  	/* Enable relaxed ordering of trigger forwarding */	
> > 
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