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perf pmu: Scan type early to fail an invalid PMU quickly

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Scan sysfs PMU's type early so that format and aliases aren't
attempted to be loaded if the PMU name is invalid.

This is the case for event_pmu tokens in parse-events.y where a wildcard
name is first assumed to be a PMU name.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Gaosheng Cui <cuigaosheng1@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230824041330.266337-15-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2023-08-23 21:13:26 -07:00 committed by Arnaldo Carvalho de Melo
parent e6ff1eed35
commit 88ed91848d
1 changed files with 12 additions and 7 deletions
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19
tools/perf/util/pmu.c
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@ -957,12 +957,21 @@ struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char
if (!pmu)
return NULL;
INIT_LIST_HEAD(&pmu->format);
INIT_LIST_HEAD(&pmu->aliases);
INIT_LIST_HEAD(&pmu->caps);
pmu->name = strdup(name);
if (!pmu->name)
goto err;
/*
* Read type early to fail fast if a lookup name isn't a PMU. Ensure
* that type value is successfully assigned (return 1).
*/
if (perf_pmu__scan_file_at(pmu, dirfd, "type", "%u", &type) != 1)
goto err;
INIT_LIST_HEAD(&pmu->format);
INIT_LIST_HEAD(&pmu->aliases);
INIT_LIST_HEAD(&pmu->caps);
/*
* The pmu data we store & need consists of the pmu
* type value and format definitions. Load both right
@ -982,10 +991,6 @@ struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char
pmu->is_core = is_pmu_core(name);
pmu->cpus = pmu_cpumask(dirfd, name, pmu->is_core);
/* Read type, and ensure that type value is successfully assigned (return 1) */
if (perf_pmu__scan_file_at(pmu, dirfd, "type", "%u", &type) != 1)
goto err;
alias_name = pmu_find_alias_name(name);
if (alias_name) {
pmu->alias_name = strdup(alias_name);