1 files changed, 74 insertions, 12 deletions

diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index f817046e22b1..beb8cf9f9976 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -4,6 +4,7 @@
 #include "cpumap.h"
 #include <assert.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 static struct cpu_map *cpu_map__default_new(void)
 {
@@ -219,7 +220,7 @@ int cpu_map__get_socket(struct cpu_map *map, int idx)
         if (!mnt)
                 return -1;
 
-        sprintf(path,
+        snprintf(path, PATH_MAX,
                 "%s/devices/system/cpu/cpu%d/topology/physical_package_id",
                 mnt, cpu);
 
@@ -231,27 +232,88 @@ int cpu_map__get_socket(struct cpu_map *map, int idx)
         return ret == 1 ? cpu : -1;
 }
 
-int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
+static int cmp_ids(const void *a, const void *b)
 {
-        struct cpu_map *sock;
+        return *(int *)a - *(int *)b;
+}
+
+static int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
+                              int (*f)(struct cpu_map *map, int cpu))
+{
+        struct cpu_map *c;
         int nr = cpus->nr;
         int cpu, s1, s2;
 
-        sock = calloc(1, sizeof(*sock) + nr * sizeof(int));
-        if (!sock)
+        /* allocate as much as possible */
+        c = calloc(1, sizeof(*c) + nr * sizeof(int));
+        if (!c)
                 return -1;
 
         for (cpu = 0; cpu < nr; cpu++) {
-                s1 = cpu_map__get_socket(cpus, cpu);
-                for (s2 = 0; s2 < sock->nr; s2++) {
-                        if (s1 == sock->map[s2])
+                s1 = f(cpus, cpu);
+                for (s2 = 0; s2 < c->nr; s2++) {
+                        if (s1 == c->map[s2])
                                 break;
                 }
-                if (s2 == sock->nr) {
-                        sock->map[sock->nr] = s1;
-                        sock->nr++;
+                if (s2 == c->nr) {
+                        c->map[c->nr] = s1;
+                        c->nr++;
                 }
         }
-        *sockp = sock;
+        /* ensure we process id in increasing order */
+        qsort(c->map, c->nr, sizeof(int), cmp_ids);
+
+        *res = c;
         return 0;
 }
+
+int cpu_map__get_core(struct cpu_map *map, int idx)
+{
+        FILE *fp;
+        const char *mnt;
+        char path[PATH_MAX];
+        int cpu, ret, s;
+
+        if (idx > map->nr)
+                return -1;
+
+        cpu = map->map[idx];
+
+        mnt = sysfs_find_mountpoint();
+        if (!mnt)
+                return -1;
+
+        snprintf(path, PATH_MAX,
+                "%s/devices/system/cpu/cpu%d/topology/core_id",
+                mnt, cpu);
+
+        fp = fopen(path, "r");
+        if (!fp)
+                return -1;
+        ret = fscanf(fp, "%d", &cpu);
+        fclose(fp);
+        if (ret != 1)
+                return -1;
+
+        s = cpu_map__get_socket(map, idx);
+        if (s == -1)
+                return -1;
+
+        /*
+         * encode socket in upper 16 bits
+         * core_id is relative to socket, and
+         * we need a global id. So we combine
+         * socket+ core id
+         */
+        return (s << 16) | (cpu & 0xffff);
+}
+
+int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
+{
+        return cpu_map__build_map(cpus, sockp, cpu_map__get_socket);
+}
+
+int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
+{
+        return cpu_map__build_map(cpus, corep, cpu_map__get_core);
+}