linux-kernel - Re: [PATCH] perf: cs-etm: Update decoder code for OpenCSD version 1.4

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Message-ID: <Y9fNWrBIN8o1Ww25@kernel.org>
Date:   Mon, 30 Jan 2023 10:59:54 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     James Clark <james.clark@....com>
Cc:     Mike Leach <mike.leach@...aro.org>,
        linux-perf-users@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
        mathieu.poirier@...aro.org, linux-kernel@...r.kernel.org,
        peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH] perf: cs-etm: Update decoder code for OpenCSD version 1.4

Em Mon, Jan 30, 2023 at 12:05:53PM +0000, James Clark escreveu:
> On 24/01/2023 21:50, Ian Rogers wrote:
> > On Fri, Jan 20, 2023 at 7:47 AM James Clark <james.clark@....com> wrote:
> >> On 20/01/2023 15:37, Mike Leach wrote:
> >>> OpenCSD version 1.4 is released with support for FEAT_ITE.
> >>> This adds a new packet type, with associated output element ID in
> >>> the packet type enum - OCSD_GEN_TRC_ELEM_INSTRUMENTATION.
> >>>
> >>> As we just ignore this packet in perf, add to the switch statement
> >>> to avoid the "enum not handled in switch error", but conditionally
> >>> so as not to break the perf build for older OpenCSD installations.
> >>>
> >>> Signed-off-by: Mike Leach <mike.leach@...aro.org>
> >>> ---
> >>>  tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 3 +++
> >>>  1 file changed, 3 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 fa3aa9c0fb2e..48e7121880a9 100644
> >>> --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> >>> +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> >>> @@ -604,6 +604,9 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
> >>>       case OCSD_GEN_TRC_ELEM_CUSTOM:
> >>>       case OCSD_GEN_TRC_ELEM_SYNC_MARKER:
> >>>       case OCSD_GEN_TRC_ELEM_MEMTRANS:
> >>> +#if (OCSD_VER_NUM >= 0x010400)
> >>> +     case OCSD_GEN_TRC_ELEM_INSTRUMENTATION:
> >>> +#endif
> >>>       default:
> >>>               break;
> >>>       }
> >>
> >> Checked the build with both old and new versions of OpenCSD and it's ok:
> >>
> >> Reviewed-by: James Clark <james.clark@....com>
> > 
> > Acked-by: Ian Rogers <irogers@...gle.com>
> > 
> > Thanks,
> > Ian
> 
> Hi Arnaldo,
> 
> Is it ok to merge this change? If anyone is building with the latest
> OpenCSD they will get a build error on the unhandled switch case, and we
> just got it in our CI too.
> 
> I suppose we could disable the warning around this switch, but it's
> pretty rare to add new packets so might be best to leave it.

Thanks, applied.

- Arnaldo