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perf pmu: Add pmu_id()
Add a function to read the PMU id sysfs entry. This is only done for uncore PMUs where this would possibly be relevant. Signed-off-by: John Garry <john.garry@huawei.com> Acked-by: Kajol Jain <kjain@linux.ibm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Joakim Zhang <qiangqing.zhang@nxp.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Kim Phillips <kim.phillips@amd.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shaokun Zhang <zhangshaokun@hisilicon.com> Cc: Will Deacon <will@kernel.org> Cc: linux-arm-kernel@lists.infradead.org Cc: linuxarm@huawei.com Link: http://lore.kernel.org/lkml/1607080216-36968-4-git-send-email-john.garry@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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2 changed files with 19 additions and 0 deletions
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@ -597,6 +597,7 @@ static struct perf_cpu_map *__pmu_cpumask(const char *path)
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* Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
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* may have a "cpus" file.
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*/
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#define SYS_TEMPLATE_ID "./bus/event_source/devices/%s/identifier"
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#define CPUS_TEMPLATE_UNCORE "%s/bus/event_source/devices/%s/cpumask"
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#define CPUS_TEMPLATE_CPU "%s/bus/event_source/devices/%s/cpus"
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@ -635,6 +636,21 @@ static bool pmu_is_uncore(const char *name)
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return file_available(path);
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}
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static char *pmu_id(const char *name)
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{
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char path[PATH_MAX], *str;
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size_t len;
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snprintf(path, PATH_MAX, SYS_TEMPLATE_ID, name);
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if (sysfs__read_str(path, &str, &len) < 0)
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return NULL;
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str[len - 1] = 0; /* remove line feed */
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return str;
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}
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/*
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* PMU CORE devices have different name other than cpu in sysfs on some
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* platforms.
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@ -847,6 +863,8 @@ static struct perf_pmu *pmu_lookup(const char *name)
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pmu->name = strdup(name);
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pmu->type = type;
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pmu->is_uncore = pmu_is_uncore(name);
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if (pmu->is_uncore)
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pmu->id = pmu_id(name);
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pmu->max_precise = pmu_max_precise(name);
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pmu_add_cpu_aliases(&aliases, pmu);
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@ -30,6 +30,7 @@ struct perf_pmu_caps {
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struct perf_pmu {
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char *name;
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char *id;
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__u32 type;
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bool selectable;
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bool is_uncore;
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