[PATCH v4 3/4] perf utils: Add helper function is_pmu_core to detect PMU CORE devices

[Ganapatrao Kulkarni]

On some platforms, PMU core devices sysfs name is not cpu.
Adding function is_pmu_core to detect as core device using
core device specific hints in sysfs.

For arm64 platforms, all core devices have file "cpus" in sysfs.

Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulka...@cavium.com>
---
 tools/perf/util/pmu.c | 44 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 40 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index aefdbd1..0057d1c 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -506,6 +506,39 @@ static struct cpu_map *pmu_cpumask(const char *name)
 }
 
 /*
+ *  PMU CORE devices have different name other than cpu in sysfs on some
+ *  platforms. looking for possible sysfs files to identify as core device.
+ */
+static int is_pmu_core(const char *name)
+{
+       struct stat st;
+       char path[PATH_MAX];
+       const char *sysfs = sysfs__mountpoint();
+       const char **template;
+       const char *templates[] = {
+                "%s/bus/event_source/devices/%s/cpus",
+                NULL
+       };
+
+       if (!sysfs)
+               return 0;
+
+       /* Look for cpu sysfs */
+       snprintf(path, PATH_MAX, "%s/bus/event_source/devices/cpu", sysfs);
+       if ((stat(path, &st) == 0) &&
+                       (strncmp(name, "cpu", strlen("cpu")) == 0))
+               return 1;
+
+       for (template = templates; *template; template++) {
+               snprintf(path, PATH_MAX, *template, sysfs, name);
+               if (stat(path, &st) == 0)
+                       return 1;
+       }
+
+       return 0;
+}
+
+/*
  * Return the CPU id as a raw string.
  *
  * Each architecture should provide a more precise id string that
@@ -558,15 +591,18 @@ static void pmu_add_cpu_aliases(struct list_head *head, 
const char *name,
         */
        i = 0;
        while (1) {
-               const char *pname;
 
                pe = &map->table[i++];
                if (!pe->name)
                        break;
 
-               pname = pe->pmu ? pe->pmu : "cpu";
-               if (strncmp(pname, name, strlen(pname)))
-                       continue;
+               if (!is_pmu_core(name)) {
+                       /* check for uncore devices */
+                       if (pe->pmu == NULL)
+                               continue;
+                       if (strncmp(pe->pmu, name, strlen(pe->pmu)))
+                               continue;
+               }
 
                /* need type casts to override 'const' */
                __perf_pmu__new_alias(head, NULL, (char *)pe->name,
-- 
2.9.4