linux-kernel - Re: [PATCH v1 3/3] perf arm-spe: Support data source for Cortex-X4 CPU

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Message-ID: <20230728142204.GB21718@willie-the-truck>
Date:   Fri, 28 Jul 2023 15:22:05 +0100
From:   Will Deacon <will@...nel.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        John Garry <john.g.garry@...cle.com>,
        James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        D Scott Phillips <scott@...amperecomputing.com>,
        Marc Zyngier <maz@...nel.org>,
        German Gomez <german.gomez@....com>,
        Ali Saidi <alisaidi@...zon.com>,
        Jing Zhang <renyu.zj@...ux.alibaba.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, fissure2010@...il.com
Subject: Re: [PATCH v1 3/3] perf arm-spe: Support data source for Cortex-X4
 CPU

On Mon, Jul 24, 2023 at 07:05:09PM +0800, Leo Yan wrote:
> On Mon, Jul 24, 2023 at 12:27:31PM +0530, Anshuman Khandual wrote:
> 
> [...]
> 
> > > -static const struct midr_range neoverse_spe[] = {
> > > +static const struct midr_range cpus_use_default_data_src[] = {
> > 
> > Is not 'cpus_use_default_data_src' too long ? 'use' could be dropped ?
> 
> Okay, I can drop 'use'.
> 
> > >  	MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N1),
> > >  	MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N2),
> > >  	MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V1),
> > > +	MIDR_ALL_VERSIONS(MIDR_CORTEX_X4),
> > >  	{},
> > >  };
> 
> [...]
> 
> > >  static u64 arm_spe__synth_data_source(const struct arm_spe_record *record, u64 midr)
> > >  {
> > >  	union perf_mem_data_src	data_src = { .mem_op = PERF_MEM_OP_NA };
> > > -	bool is_neoverse = is_midr_in_range_list(midr, neoverse_spe);
> > > +	bool is_default_dc =
> > 
> > _dc stands for ?
> 
> Thanks for pointing out this; actually I mean '_ds' which stands for
> data source.  Will spin a new patch for this.

Thanks. Please can you put patch 2 (the one touching tools) at the end of
the series, too? That way I can easily pick up the kernel changes.

Will