1 files changed, 160 insertions, 0 deletions

diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index 7fe4994eeb63..c4e55b71010c 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -317,3 +317,163 @@ 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);
 }
+
+/* setup simple routines to easily access node numbers given a cpu number */
+static int get_max_num(char *path, int *max)
+{
+        size_t num;
+        char *buf;
+        int err = 0;
+
+        if (filename__read_str(path, &buf, &num))
+                return -1;
+
+        buf[num] = '\0';
+
+        /* start on the right, to find highest node num */
+        while (--num) {
+                if ((buf[num] == ',') || (buf[num] == '-')) {
+                        num++;
+                        break;
+                }
+        }
+        if (sscanf(&buf[num], "%d", max) < 1) {
+                err = -1;
+                goto out;
+        }
+
+        /* convert from 0-based to 1-based */
+        (*max)++;
+
+out:
+        free(buf);
+        return err;
+}
+
+/* Determine highest possible cpu in the system for sparse allocation */
+static void set_max_cpu_num(void)
+{
+        const char *mnt;
+        char path[PATH_MAX];
+        int ret = -1;
+
+        /* set up default */
+        max_cpu_num = 4096;
+
+        mnt = sysfs__mountpoint();
+        if (!mnt)
+                goto out;
+
+        /* get the highest possible cpu number for a sparse allocation */
+        ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
+        if (ret == PATH_MAX) {
+                pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
+                goto out;
+        }
+
+        ret = get_max_num(path, &max_cpu_num);
+
+out:
+        if (ret)
+                pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
+}
+
+/* Determine highest possible node in the system for sparse allocation */
+static void set_max_node_num(void)
+{
+        const char *mnt;
+        char path[PATH_MAX];
+        int ret = -1;
+
+        /* set up default */
+        max_node_num = 8;
+
+        mnt = sysfs__mountpoint();
+        if (!mnt)
+                goto out;
+
+        /* get the highest possible cpu number for a sparse allocation */
+        ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
+        if (ret == PATH_MAX) {
+                pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
+                goto out;
+        }
+
+        ret = get_max_num(path, &max_node_num);
+
+out:
+        if (ret)
+                pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
+}
+
+static int init_cpunode_map(void)
+{
+        int i;
+
+        set_max_cpu_num();
+        set_max_node_num();
+
+        cpunode_map = calloc(max_cpu_num, sizeof(int));
+        if (!cpunode_map) {
+                pr_err("%s: calloc failed\n", __func__);
+                return -1;
+        }
+
+        for (i = 0; i < max_cpu_num; i++)
+                cpunode_map[i] = -1;
+
+        return 0;
+}
+
+int cpu__setup_cpunode_map(void)
+{
+        struct dirent *dent1, *dent2;
+        DIR *dir1, *dir2;
+        unsigned int cpu, mem;
+        char buf[PATH_MAX];
+        char path[PATH_MAX];
+        const char *mnt;
+        int n;
+
+        /* initialize globals */
+        if (init_cpunode_map())
+                return -1;
+
+        mnt = sysfs__mountpoint();
+        if (!mnt)
+                return 0;
+
+        n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
+        if (n == PATH_MAX) {
+                pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
+                return -1;
+        }
+
+        dir1 = opendir(path);
+        if (!dir1)
+                return 0;
+
+        /* walk tree and setup map */
+        while ((dent1 = readdir(dir1)) != NULL) {
+                if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
+                        continue;
+
+                n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
+                if (n == PATH_MAX) {
+                        pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
+                        continue;
+                }
+
+                dir2 = opendir(buf);
+                if (!dir2)
+                        continue;
+                while ((dent2 = readdir(dir2)) != NULL) {
+                        if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
+                                continue;
+                        cpunode_map[cpu] = mem;
+                }
+                closedir(dir2);
+        }
+        closedir(dir1);
+        return 0;
+}