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-rw-r--r--tools/perf/util/cpumap.c588
1 files changed, 588 insertions, 0 deletions
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
new file mode 100644
index 000000000..dc5c5e6fc
--- /dev/null
+++ b/tools/perf/util/cpumap.c
@@ -0,0 +1,588 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <api/fs/fs.h>
+#include "cpumap.h"
+#include "debug.h"
+#include "event.h"
+#include <assert.h>
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <linux/bitmap.h>
+#include "asm/bug.h"
+
+#include <linux/ctype.h>
+#include <linux/zalloc.h>
+
+static int max_cpu_num;
+static int max_present_cpu_num;
+static int max_node_num;
+static int *cpunode_map;
+
+static struct perf_cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
+{
+ struct perf_cpu_map *map;
+
+ map = perf_cpu_map__empty_new(cpus->nr);
+ if (map) {
+ unsigned i;
+
+ for (i = 0; i < cpus->nr; i++) {
+ /*
+ * Special treatment for -1, which is not real cpu number,
+ * and we need to use (int) -1 to initialize map[i],
+ * otherwise it would become 65535.
+ */
+ if (cpus->cpu[i] == (u16) -1)
+ map->map[i] = -1;
+ else
+ map->map[i] = (int) cpus->cpu[i];
+ }
+ }
+
+ return map;
+}
+
+static struct perf_cpu_map *cpu_map__from_mask(struct perf_record_record_cpu_map *mask)
+{
+ struct perf_cpu_map *map;
+ int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
+
+ nr = bitmap_weight(mask->mask, nbits);
+
+ map = perf_cpu_map__empty_new(nr);
+ if (map) {
+ int cpu, i = 0;
+
+ for_each_set_bit(cpu, mask->mask, nbits)
+ map->map[i++] = cpu;
+ }
+ return map;
+
+}
+
+struct perf_cpu_map *cpu_map__new_data(struct perf_record_cpu_map_data *data)
+{
+ if (data->type == PERF_CPU_MAP__CPUS)
+ return cpu_map__from_entries((struct cpu_map_entries *)data->data);
+ else
+ return cpu_map__from_mask((struct perf_record_record_cpu_map *)data->data);
+}
+
+size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp)
+{
+#define BUFSIZE 1024
+ char buf[BUFSIZE];
+
+ cpu_map__snprint(map, buf, sizeof(buf));
+ return fprintf(fp, "%s\n", buf);
+#undef BUFSIZE
+}
+
+struct perf_cpu_map *perf_cpu_map__empty_new(int nr)
+{
+ struct perf_cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
+
+ if (cpus != NULL) {
+ int i;
+
+ cpus->nr = nr;
+ for (i = 0; i < nr; i++)
+ cpus->map[i] = -1;
+
+ refcount_set(&cpus->refcnt, 1);
+ }
+
+ return cpus;
+}
+
+static int cpu__get_topology_int(int cpu, const char *name, int *value)
+{
+ char path[PATH_MAX];
+
+ snprintf(path, PATH_MAX,
+ "devices/system/cpu/cpu%d/topology/%s", cpu, name);
+
+ return sysfs__read_int(path, value);
+}
+
+int cpu_map__get_socket_id(int cpu)
+{
+ int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
+ return ret ?: value;
+}
+
+int cpu_map__get_socket(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
+{
+ int cpu;
+
+ if (idx > map->nr)
+ return -1;
+
+ cpu = map->map[idx];
+
+ return cpu_map__get_socket_id(cpu);
+}
+
+static int cmp_ids(const void *a, const void *b)
+{
+ return *(int *)a - *(int *)b;
+}
+
+int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res,
+ int (*f)(struct perf_cpu_map *map, int cpu, void *data),
+ void *data)
+{
+ struct perf_cpu_map *c;
+ int nr = cpus->nr;
+ int cpu, s1, s2;
+
+ /* allocate as much as possible */
+ c = calloc(1, sizeof(*c) + nr * sizeof(int));
+ if (!c)
+ return -1;
+
+ for (cpu = 0; cpu < nr; cpu++) {
+ s1 = f(cpus, cpu, data);
+ for (s2 = 0; s2 < c->nr; s2++) {
+ if (s1 == c->map[s2])
+ break;
+ }
+ if (s2 == c->nr) {
+ c->map[c->nr] = s1;
+ c->nr++;
+ }
+ }
+ /* ensure we process id in increasing order */
+ qsort(c->map, c->nr, sizeof(int), cmp_ids);
+
+ refcount_set(&c->refcnt, 1);
+ *res = c;
+ return 0;
+}
+
+int cpu_map__get_die_id(int cpu)
+{
+ int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
+
+ return ret ?: value;
+}
+
+int cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
+{
+ int cpu, die_id, s;
+
+ if (idx > map->nr)
+ return -1;
+
+ cpu = map->map[idx];
+
+ die_id = cpu_map__get_die_id(cpu);
+ /* There is no die_id on legacy system. */
+ if (die_id == -1)
+ die_id = 0;
+
+ s = cpu_map__get_socket(map, idx, data);
+ if (s == -1)
+ return -1;
+
+ /*
+ * Encode socket in bit range 15:8
+ * die_id is relative to socket, and
+ * we need a global id. So we combine
+ * socket + die id
+ */
+ if (WARN_ONCE(die_id >> 8, "The die id number is too big.\n"))
+ return -1;
+
+ if (WARN_ONCE(s >> 8, "The socket id number is too big.\n"))
+ return -1;
+
+ return (s << 8) | (die_id & 0xff);
+}
+
+int cpu_map__get_core_id(int cpu)
+{
+ int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
+ return ret ?: value;
+}
+
+int cpu_map__get_node_id(int cpu)
+{
+ return cpu__get_node(cpu);
+}
+
+int cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
+{
+ int cpu, s_die;
+
+ if (idx > map->nr)
+ return -1;
+
+ cpu = map->map[idx];
+
+ cpu = cpu_map__get_core_id(cpu);
+
+ /* s_die is the combination of socket + die id */
+ s_die = cpu_map__get_die(map, idx, data);
+ if (s_die == -1)
+ return -1;
+
+ /*
+ * encode socket in bit range 31:24
+ * encode die id in bit range 23:16
+ * core_id is relative to socket and die,
+ * we need a global id. So we combine
+ * socket + die id + core id
+ */
+ if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n"))
+ return -1;
+
+ return (s_die << 16) | (cpu & 0xffff);
+}
+
+int cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
+{
+ if (idx < 0 || idx >= map->nr)
+ return -1;
+
+ return cpu_map__get_node_id(map->map[idx]);
+}
+
+int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp)
+{
+ return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
+}
+
+int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep)
+{
+ return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
+}
+
+int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep)
+{
+ return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
+}
+
+int cpu_map__build_node_map(struct perf_cpu_map *cpus, struct perf_cpu_map **numap)
+{
+ return cpu_map__build_map(cpus, numap, cpu_map__get_node, NULL);
+}
+
+/* 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;
+ max_present_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);
+ if (ret)
+ goto out;
+
+ /* get the highest present cpu number for a sparse allocation */
+ ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", 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_present_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);
+}
+
+int cpu__max_node(void)
+{
+ if (unlikely(!max_node_num))
+ set_max_node_num();
+
+ return max_node_num;
+}
+
+int cpu__max_cpu(void)
+{
+ if (unlikely(!max_cpu_num))
+ set_max_cpu_num();
+
+ return max_cpu_num;
+}
+
+int cpu__max_present_cpu(void)
+{
+ if (unlikely(!max_present_cpu_num))
+ set_max_cpu_num();
+
+ return max_present_cpu_num;
+}
+
+
+int cpu__get_node(int cpu)
+{
+ if (unlikely(cpunode_map == NULL)) {
+ pr_debug("cpu_map not initialized\n");
+ return -1;
+ }
+
+ return cpunode_map[cpu];
+}
+
+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;
+}
+
+bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
+{
+ return perf_cpu_map__idx(cpus, cpu) != -1;
+}
+
+int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
+{
+ return cpus->map[idx];
+}
+
+size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
+{
+ int i, cpu, start = -1;
+ bool first = true;
+ size_t ret = 0;
+
+#define COMMA first ? "" : ","
+
+ for (i = 0; i < map->nr + 1; i++) {
+ bool last = i == map->nr;
+
+ cpu = last ? INT_MAX : map->map[i];
+
+ if (start == -1) {
+ start = i;
+ if (last) {
+ ret += snprintf(buf + ret, size - ret,
+ "%s%d", COMMA,
+ map->map[i]);
+ }
+ } else if (((i - start) != (cpu - map->map[start])) || last) {
+ int end = i - 1;
+
+ if (start == end) {
+ ret += snprintf(buf + ret, size - ret,
+ "%s%d", COMMA,
+ map->map[start]);
+ } else {
+ ret += snprintf(buf + ret, size - ret,
+ "%s%d-%d", COMMA,
+ map->map[start], map->map[end]);
+ }
+ first = false;
+ start = i;
+ }
+ }
+
+#undef COMMA
+
+ pr_debug2("cpumask list: %s\n", buf);
+ return ret;
+}
+
+static char hex_char(unsigned char val)
+{
+ if (val < 10)
+ return val + '0';
+ if (val < 16)
+ return val - 10 + 'a';
+ return '?';
+}
+
+size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
+{
+ int i, cpu;
+ char *ptr = buf;
+ unsigned char *bitmap;
+ int last_cpu = cpu_map__cpu(map, map->nr - 1);
+
+ if (buf == NULL)
+ return 0;
+
+ bitmap = zalloc(last_cpu / 8 + 1);
+ if (bitmap == NULL) {
+ buf[0] = '\0';
+ return 0;
+ }
+
+ for (i = 0; i < map->nr; i++) {
+ cpu = cpu_map__cpu(map, i);
+ bitmap[cpu / 8] |= 1 << (cpu % 8);
+ }
+
+ for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
+ unsigned char bits = bitmap[cpu / 8];
+
+ if (cpu % 8)
+ bits >>= 4;
+ else
+ bits &= 0xf;
+
+ *ptr++ = hex_char(bits);
+ if ((cpu % 32) == 0 && cpu > 0)
+ *ptr++ = ',';
+ }
+ *ptr = '\0';
+ free(bitmap);
+
+ buf[size - 1] = '\0';
+ return ptr - buf;
+}
+
+const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
+{
+ static const struct perf_cpu_map *online = NULL;
+
+ if (!online)
+ online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */
+
+ return online;
+}