linux-kernel - Re: [PATCH 01/32] s390/sclp: detect the zPCI interpretation facility

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Date:   Wed, 08 Dec 2021 09:33:30 -0500
From:   Eric Farman <farman@...ux.ibm.com>
To:     Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        linux-s390@...r.kernel.org
Cc:     alex.williamson@...hat.com, cohuck@...hat.com,
        schnelle@...ux.ibm.com, pmorel@...ux.ibm.com, hca@...ux.ibm.com,
        gor@...ux.ibm.com, gerald.schaefer@...ux.ibm.com,
        agordeev@...ux.ibm.com, frankja@...ux.ibm.com, david@...hat.com,
        imbrenda@...ux.ibm.com, vneethv@...ux.ibm.com,
        oberpar@...ux.ibm.com, freude@...ux.ibm.com, thuth@...hat.com,
        pasic@...ux.ibm.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/32] s390/sclp: detect the zPCI interpretation facility

On Wed, 2021-12-08 at 12:12 +0100, Christian Borntraeger wrote:
> Am 07.12.21 um 21:57 schrieb Matthew Rosato:
> > Detect the zPCI Load/Store Interpretation facility.
> > 
> > Reviewed-by: Eric Farman <farman@...ux.ibm.com>
> > Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
> > ---
> >   arch/s390/include/asm/sclp.h   | 1 +
> >   drivers/s390/char/sclp_early.c | 1 +
> >   2 files changed, 2 insertions(+)
> > 
> > diff --git a/arch/s390/include/asm/sclp.h
> > b/arch/s390/include/asm/sclp.h
> > index c68ea35de498..c84e8e0ca344 100644
> > --- a/arch/s390/include/asm/sclp.h
> > +++ b/arch/s390/include/asm/sclp.h
> > @@ -88,6 +88,7 @@ struct sclp_info {
> >   	unsigned char has_diag318 : 1;
> >   	unsigned char has_sipl : 1;
> >   	unsigned char has_dirq : 1;
> > +	unsigned char has_zpci_interp : 1;
> 
> maybe use zpci_lsi (load store interpretion) as pci interpretion
> would be something else (also fix the the subject line).
> With that
> 
> Reviewed-by: Christian Borntraeger <borntraeger@...ibm.com>

My r-b can stay with Christian's suggested change.

> 
> 
> >   	unsigned int ibc;
> >   	unsigned int mtid;
> >   	unsigned int mtid_cp;
> > diff --git a/drivers/s390/char/sclp_early.c
> > b/drivers/s390/char/sclp_early.c
> > index b64feab62caa..2e8199b7ae50 100644
> > --- a/drivers/s390/char/sclp_early.c
> > +++ b/drivers/s390/char/sclp_early.c
> > @@ -45,6 +45,7 @@ static void __init
> > sclp_early_facilities_detect(void)
> >   	sclp.has_gisaf = !!(sccb->fac118 & 0x08);
> >   	sclp.has_hvs = !!(sccb->fac119 & 0x80);
> >   	sclp.has_kss = !!(sccb->fac98 & 0x01);
> > +	sclp.has_zpci_interp = !!(sccb->fac118 & 0x01);
> >   	if (sccb->fac85 & 0x02)
> >   		S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
> >   	if (sccb->fac91 & 0x40)
> >