linux-kernel - Re: [PATCH v6 2/2] drivers/perf: Add CCPI2 PMU support in ThunderX2 UNCORE driver.

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Date:   Fri, 18 Oct 2019 09:51:34 +0530
From:   Ganapatrao Kulkarni <gklkml16@...il.com>
To:     Will Deacon <will@...nel.org>
Cc:     John Garry <john.garry@...wei.com>,
        Ganapatrao Prabhakerrao Kulkarni <gkulkarni@...vell.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "corbet@....net" <corbet@....net>,
        Jan Glauber <jglauber@...vell.com>,
        Jayachandran Chandrasekharan Nair <jnair@...vell.com>,
        Robert Richter <rrichter@...vell.com>,
        Zhangshaokun <zhangshaokun@...ilicon.com>
Subject: Re: [PATCH v6 2/2] drivers/perf: Add CCPI2 PMU support in ThunderX2
 UNCORE driver.

Hi Will,

On Thu, Oct 17, 2019 at 9:17 PM Will Deacon <will@...nel.org> wrote:
>
> On Thu, Oct 17, 2019 at 12:38:51PM +0530, Ganapatrao Kulkarni wrote:
> > On Wed, Oct 16, 2019 at 7:01 PM John Garry <john.garry@...wei.com> wrote:
> > > > +TX2_EVENT_ATTR(req_pktsent, CCPI2_EVENT_REQ_PKT_SENT);
> > > > +TX2_EVENT_ATTR(snoop_pktsent, CCPI2_EVENT_SNOOP_PKT_SENT);
> > > > +TX2_EVENT_ATTR(data_pktsent, CCPI2_EVENT_DATA_PKT_SENT);
> > > > +TX2_EVENT_ATTR(gic_pktsent, CCPI2_EVENT_GIC_PKT_SENT);
> > > > +
> > > > +static struct attribute *ccpi2_pmu_events_attrs[] = {
> > > > +     &tx2_pmu_event_attr_req_pktsent.attr.attr,
> > > > +     &tx2_pmu_event_attr_snoop_pktsent.attr.attr,
> > > > +     &tx2_pmu_event_attr_data_pktsent.attr.attr,
> > > > +     &tx2_pmu_event_attr_gic_pktsent.attr.attr,
> > > > +     NULL,
> > > > +};
> > >
> > > Hi Ganapatrao,
> > >
> > > Have you considered adding these as uncore pmu-events in the perf tool?
> > >
> > At the moment no, since the number of events exposed/listed are very few.
>
> Then sounds like a perfect time to nip it in the bud before the list grows
> ;)

I had internal discussion with architecture team, they have confirmed
that, these are the only published events and no plan to add new.
However, If any such request comes from HW team in future, i will add
them to JSON files.

I have incorporate all your previous comments, Can you please Ack and
queue it to 5.5?

>
> If you can manage with these things in userspace, then I agree with John
> that it would be preferential to do it that way. It also offers more
> flexibility if we get the metricgroup stuff working properly (I think it's
> buggered for big/little atm).
>
> Will

Thanks,
Ganapat