1 // SPDX-License-Identifier: GPL-2.0
10 #include <linux/bitmap.h>
13 #include <linux/ctype.h>
14 #include <linux/zalloc.h>
16 static int max_cpu_num;
17 static int max_present_cpu_num;
18 static int max_node_num;
19 static int *cpunode_map;
21 static struct perf_cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
23 struct perf_cpu_map *map;
25 map = perf_cpu_map__empty_new(cpus->nr);
29 for (i = 0; i < cpus->nr; i++) {
31 * Special treatment for -1, which is not real cpu number,
32 * and we need to use (int) -1 to initialize map[i],
33 * otherwise it would become 65535.
35 if (cpus->cpu[i] == (u16) -1)
38 map->map[i] = (int) cpus->cpu[i];
45 static struct perf_cpu_map *cpu_map__from_mask(struct perf_record_record_cpu_map *mask)
47 struct perf_cpu_map *map;
48 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
50 nr = bitmap_weight(mask->mask, nbits);
52 map = perf_cpu_map__empty_new(nr);
56 for_each_set_bit(cpu, mask->mask, nbits)
63 struct perf_cpu_map *cpu_map__new_data(struct perf_record_cpu_map_data *data)
65 if (data->type == PERF_CPU_MAP__CPUS)
66 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
68 return cpu_map__from_mask((struct perf_record_record_cpu_map *)data->data);
71 size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp)
76 cpu_map__snprint(map, buf, sizeof(buf));
77 return fprintf(fp, "%s\n", buf);
81 struct perf_cpu_map *perf_cpu_map__empty_new(int nr)
83 struct perf_cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
89 for (i = 0; i < nr; i++)
92 refcount_set(&cpus->refcnt, 1);
98 static int cpu__get_topology_int(int cpu, const char *name, int *value)
102 snprintf(path, PATH_MAX,
103 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
105 return sysfs__read_int(path, value);
108 int cpu_map__get_socket_id(int cpu)
110 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
114 int cpu_map__get_socket(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
123 return cpu_map__get_socket_id(cpu);
126 static int cmp_ids(const void *a, const void *b)
128 return *(int *)a - *(int *)b;
131 int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res,
132 int (*f)(struct perf_cpu_map *map, int cpu, void *data),
135 struct perf_cpu_map *c;
139 /* allocate as much as possible */
140 c = calloc(1, sizeof(*c) + nr * sizeof(int));
144 for (cpu = 0; cpu < nr; cpu++) {
145 s1 = f(cpus, cpu, data);
146 for (s2 = 0; s2 < c->nr; s2++) {
147 if (s1 == c->map[s2])
155 /* ensure we process id in increasing order */
156 qsort(c->map, c->nr, sizeof(int), cmp_ids);
158 refcount_set(&c->refcnt, 1);
163 int cpu_map__get_die_id(int cpu)
165 int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
170 int cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
179 die_id = cpu_map__get_die_id(cpu);
180 /* There is no die_id on legacy system. */
184 s = cpu_map__get_socket(map, idx, data);
189 * Encode socket in bit range 15:8
190 * die_id is relative to socket, and
191 * we need a global id. So we combine
194 if (WARN_ONCE(die_id >> 8, "The die id number is too big.\n"))
197 if (WARN_ONCE(s >> 8, "The socket id number is too big.\n"))
200 return (s << 8) | (die_id & 0xff);
203 int cpu_map__get_core_id(int cpu)
205 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
209 int cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
218 cpu = cpu_map__get_core_id(cpu);
220 /* s_die is the combination of socket + die id */
221 s_die = cpu_map__get_die(map, idx, data);
226 * encode socket in bit range 31:24
227 * encode die id in bit range 23:16
228 * core_id is relative to socket and die,
229 * we need a global id. So we combine
230 * socket + die id + core id
232 if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n"))
235 return (s_die << 16) | (cpu & 0xffff);
238 int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp)
240 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
243 int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep)
245 return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
248 int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep)
250 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
253 /* setup simple routines to easily access node numbers given a cpu number */
254 static int get_max_num(char *path, int *max)
260 if (filename__read_str(path, &buf, &num))
265 /* start on the right, to find highest node num */
267 if ((buf[num] == ',') || (buf[num] == '-')) {
272 if (sscanf(&buf[num], "%d", max) < 1) {
277 /* convert from 0-based to 1-based */
285 /* Determine highest possible cpu in the system for sparse allocation */
286 static void set_max_cpu_num(void)
294 max_present_cpu_num = 4096;
296 mnt = sysfs__mountpoint();
300 /* get the highest possible cpu number for a sparse allocation */
301 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
302 if (ret == PATH_MAX) {
303 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
307 ret = get_max_num(path, &max_cpu_num);
311 /* get the highest present cpu number for a sparse allocation */
312 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
313 if (ret == PATH_MAX) {
314 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
318 ret = get_max_num(path, &max_present_cpu_num);
322 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
325 /* Determine highest possible node in the system for sparse allocation */
326 static void set_max_node_num(void)
335 mnt = sysfs__mountpoint();
339 /* get the highest possible cpu number for a sparse allocation */
340 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
341 if (ret == PATH_MAX) {
342 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
346 ret = get_max_num(path, &max_node_num);
350 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
353 int cpu__max_node(void)
355 if (unlikely(!max_node_num))
361 int cpu__max_cpu(void)
363 if (unlikely(!max_cpu_num))
369 int cpu__max_present_cpu(void)
371 if (unlikely(!max_present_cpu_num))
374 return max_present_cpu_num;
378 int cpu__get_node(int cpu)
380 if (unlikely(cpunode_map == NULL)) {
381 pr_debug("cpu_map not initialized\n");
385 return cpunode_map[cpu];
388 static int init_cpunode_map(void)
395 cpunode_map = calloc(max_cpu_num, sizeof(int));
397 pr_err("%s: calloc failed\n", __func__);
401 for (i = 0; i < max_cpu_num; i++)
407 int cpu__setup_cpunode_map(void)
409 struct dirent *dent1, *dent2;
411 unsigned int cpu, mem;
417 /* initialize globals */
418 if (init_cpunode_map())
421 mnt = sysfs__mountpoint();
425 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
427 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
431 dir1 = opendir(path);
435 /* walk tree and setup map */
436 while ((dent1 = readdir(dir1)) != NULL) {
437 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
440 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
442 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
449 while ((dent2 = readdir(dir2)) != NULL) {
450 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
452 cpunode_map[cpu] = mem;
460 bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
462 return perf_cpu_map__idx(cpus, cpu) != -1;
465 int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
467 return cpus->map[idx];
470 size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
472 int i, cpu, start = -1;
476 #define COMMA first ? "" : ","
478 for (i = 0; i < map->nr + 1; i++) {
479 bool last = i == map->nr;
481 cpu = last ? INT_MAX : map->map[i];
486 ret += snprintf(buf + ret, size - ret,
490 } else if (((i - start) != (cpu - map->map[start])) || last) {
494 ret += snprintf(buf + ret, size - ret,
498 ret += snprintf(buf + ret, size - ret,
500 map->map[start], map->map[end]);
509 pr_debug2("cpumask list: %s\n", buf);
513 static char hex_char(unsigned char val)
518 return val - 10 + 'a';
522 size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
526 unsigned char *bitmap;
527 int last_cpu = cpu_map__cpu(map, map->nr - 1);
532 bitmap = zalloc(last_cpu / 8 + 1);
533 if (bitmap == NULL) {
538 for (i = 0; i < map->nr; i++) {
539 cpu = cpu_map__cpu(map, i);
540 bitmap[cpu / 8] |= 1 << (cpu % 8);
543 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
544 unsigned char bits = bitmap[cpu / 8];
551 *ptr++ = hex_char(bits);
552 if ((cpu % 32) == 0 && cpu > 0)
558 buf[size - 1] = '\0';
562 const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
564 static const struct perf_cpu_map *online = NULL;
567 online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */