perf pmu: Add pmu_id()

[linux-2.6-microblaze.git] / tools / perf / util / pmu.c

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index d41caeb..cbeda45 100644 (file)
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -597,6 +597,7 @@ static struct perf_cpu_map *__pmu_cpumask(const char *path)
  * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
  * may have a "cpus" file.
  */
+#define SYS_TEMPLATE_ID        "./bus/event_source/devices/%s/identifier"
 #define CPUS_TEMPLATE_UNCORE   "%s/bus/event_source/devices/%s/cpumask"
 #define CPUS_TEMPLATE_CPU      "%s/bus/event_source/devices/%s/cpus"
 
@@ -635,6 +636,21 @@ static bool pmu_is_uncore(const char *name)
        return file_available(path);
 }
 
+static char *pmu_id(const char *name)
+{
+       char path[PATH_MAX], *str;
+       size_t len;
+
+       snprintf(path, PATH_MAX, SYS_TEMPLATE_ID, name);
+
+       if (sysfs__read_str(path, &str, &len) < 0)
+               return NULL;
+
+       str[len - 1] = 0; /* remove line feed */
+
+       return str;
+}
+
 /*
  *  PMU CORE devices have different name other than cpu in sysfs on some
  *  platforms.
@@ -847,6 +863,8 @@ static struct perf_pmu *pmu_lookup(const char *name)
        pmu->name = strdup(name);
        pmu->type = type;
        pmu->is_uncore = pmu_is_uncore(name);
+       if (pmu->is_uncore)
+               pmu->id = pmu_id(name);
        pmu->max_precise = pmu_max_precise(name);
        pmu_add_cpu_aliases(&aliases, pmu);