linux-kernel - Re: [PATCH] perf: cs-etm: Update to build with latest opencsd version.

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Date:   Tue, 21 Apr 2020 18:23:54 +0100
From:   Mike Leach <mike.leach@...aro.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Leo Yan <leo.yan@...aro.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Coresight ML <coresight@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH] perf: cs-etm: Update to build with latest opencsd version.

HI Mathieu, Leo.

Agreed - I'll fix up to use only the latest

Thanks

Mike

On Tue, 21 Apr 2020 at 17:52, Mathieu Poirier
<mathieu.poirier@...aro.org> wrote:
>
> On Thu, 16 Apr 2020 at 20:11, Leo Yan <leo.yan@...aro.org> wrote:
> >
> > Hi Mike,
> >
> > On Wed, Apr 15, 2020 at 09:14:20PM +0100, Mike Leach wrote:
> > > OpenCSD version v0.14.0 adds in a new output element. This is represented
> > > by a new value in the generic element type enum, which must be added to
> > > the handling code in perf cs-etm-decoder to prevent build errors due to
> > > build options on the perf project.
> > >
> > > This element is not currently used by the perf decoder.
> > >
> > > Tested on Linux 5.7-rc1.
> > >
> > > Signed-off-by: Mike Leach <mike.leach@...aro.org>
> > > ---
> > >  tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > >
> > > diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> > > index cd92a99eb89d..da4737cbc2ab 100644
> > > --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> > > +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> > > @@ -564,6 +564,10 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
> > >               resp = cs_etm_decoder__set_tid(etmq, packet_queue,
> > >                                              elem, trace_chan_id);
> > >               break;
> > > +     /* Unused packet types */
> > > +#if OCSD_VER_NUM >= 0x0E00
> > > +     case OCSD_GEN_TRC_ELEM_I_RANGE_NOPATH:
> > > +#endif
> >
> > I don't think use macros to distinguish OpenCSD version number is a
> > good idea, this will get more and more code to checking version number
> > if later have more these kinds improvement and finally it's hard to
> > maintain.
>
> I agree.
>
> >
> > Sugget just simply add the new case for
> > OCSD_GEN_TRC_ELEM_I_RANGE_NOPATH, considering if user uses an old version
> > OpenCSD and doesn't output this new element, the new added case doesn't
> > introduce issue for old OpenCSD lib.
> >
> > Futhermore, suggest to change the code in
> > tools/build/feature/test-libopencsd.c, so can reflect the kernel 5.7
> > to require OpenCSD v0.14.0 or later version when build perf.
>
> As Leo pointed out, I think we should just continue dealing with new
> versions of the library in test-libopencsd.c.
>
> >
> > Thanks,
> > Leo
> >
> > >       case OCSD_GEN_TRC_ELEM_ADDR_NACC:
> > >       case OCSD_GEN_TRC_ELEM_CYCLE_COUNT:
> > >       case OCSD_GEN_TRC_ELEM_ADDR_UNKNOWN:
> > > --
> > > 2.17.1
> > >
> > > _______________________________________________
> > > CoreSight mailing list
> > > CoreSight@...ts.linaro.org
> > > https://lists.linaro.org/mailman/listinfo/coresight

-- 
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK

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