linux-kernel - Re: [PATCH v3 1/3] perf: Skip and warn on unknown format 'configN' attrs

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Date:   Thu, 29 Sep 2022 14:48:03 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org,
        James Clark <james.clark@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] perf: Skip and warn on unknown format 'configN'
 attrs

Hi Rob,

On Wed, Sep 14, 2022 at 03:08:34PM -0500, Rob Herring wrote:

[...]

> +void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu)
> +{
> +	struct perf_pmu_format *format;
> +
> +	list_for_each_entry(format, &pmu->format, list)
> +		if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END) {
> +			pr_warning("WARNING: '%s' format '%s' requires 'perf_event_attr::config%d'"
> +				   "which is not supported by this version of perf!\n",
> +				   pmu->name, format->name, format->value);
> +			return;
> +		}
> +}

Though I saw you and Namhyung have discussion in underway, this patch
set is fine for me.  I validated the patches at my side (with a bit
hacking in Arm SPE driver for faking invert filter).  You could add my
tested tag for this patch set:

Tested-by: Leo Yan <leo.yan@...aro.org>

But I want to remind two things after I used "perf test" to validate
this patch set:

  $ ./perf test list
  6: Parse event definition strings
  6:1: Test event parsing
  6:2: Test parsing of "hybrid" CPU events
  6:3: Parsing of all PMU events from sysfs
  6:4: Parsing of given PMU events from sysfs
  6:5: Parsing of aliased events from sysfs
  6:6: Parsing of aliased events
  6:7: Parsing of terms (event modifiers)
  $ ./perf test -v 6

The first one is this patch set introduces segmentation fault for the
case "Parsing of aliased events" (See tests/parse-events.c).  But the
issue is caused by the test case itself; we need to add below line into
test_event_fake_pmu() for initialisation list header.

    INIT_LIST_HEAD(&perf_pmu__fake.format);

The second question is for testing config3 in "perf test".  You could
see the file tests/parse-events.c has included several test cases for
config/config1/config2.  It's good to add the same testing for config3
as well, please see test__checkevent_pmu() and test__checkterms_simple()
for relevant code.

Thanks,
Leo