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 struct cpu_aggr_map *cpu_aggr_map__empty_new(int nr)
100 struct cpu_aggr_map *cpus = malloc(sizeof(*cpus) + sizeof(struct aggr_cpu_id) * nr);
106 for (i = 0; i < nr; i++)
107 cpus->map[i] = cpu_map__empty_aggr_cpu_id();
109 refcount_set(&cpus->refcnt, 1);
115 static int cpu__get_topology_int(int cpu, const char *name, int *value)
119 snprintf(path, PATH_MAX,
120 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
122 return sysfs__read_int(path, value);
125 int cpu_map__get_socket_id(int cpu)
127 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
131 struct aggr_cpu_id cpu_map__get_socket(struct perf_cpu_map *map, int idx,
132 void *data __maybe_unused)
135 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
142 id.id = cpu_map__get_socket_id(cpu);
146 static int cmp_aggr_cpu_id(const void *a_pointer, const void *b_pointer)
148 struct aggr_cpu_id *a = (struct aggr_cpu_id *)a_pointer;
149 struct aggr_cpu_id *b = (struct aggr_cpu_id *)b_pointer;
152 return a->id - b->id;
154 return a->node - b->node;
157 int cpu_map__build_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **res,
158 struct aggr_cpu_id (*f)(struct perf_cpu_map *map, int cpu, void *data),
162 struct cpu_aggr_map *c = cpu_aggr_map__empty_new(nr);
164 struct aggr_cpu_id s1;
169 /* Reset size as it may only be partially filled */
172 for (cpu = 0; cpu < nr; cpu++) {
173 s1 = f(cpus, cpu, data);
174 for (s2 = 0; s2 < c->nr; s2++) {
175 if (cpu_map__compare_aggr_cpu_id(s1, c->map[s2]))
183 /* ensure we process id in increasing order */
184 qsort(c->map, c->nr, sizeof(struct aggr_cpu_id), cmp_aggr_cpu_id);
190 int cpu_map__get_die_id(int cpu)
192 int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
197 struct aggr_cpu_id cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
200 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
207 id.id = cpu_map__get_die_id(cpu);
208 /* There is no die_id on legacy system. */
212 s = cpu_map__get_socket(map, idx, data).id;
214 return cpu_map__empty_aggr_cpu_id();
217 * Encode socket in bit range 15:8
218 * die_id is relative to socket, and
219 * we need a global id. So we combine
222 if (WARN_ONCE(id.id >> 8, "The die id number is too big.\n"))
223 return cpu_map__empty_aggr_cpu_id();
225 if (WARN_ONCE(s >> 8, "The socket id number is too big.\n"))
226 return cpu_map__empty_aggr_cpu_id();
228 id.id = (s << 8) | (id.id & 0xff);
232 int cpu_map__get_core_id(int cpu)
234 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
238 int cpu_map__get_node_id(int cpu)
240 return cpu__get_node(cpu);
243 struct aggr_cpu_id cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
246 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
253 cpu = cpu_map__get_core_id(cpu);
255 /* cpu_map__get_die returns the combination of socket + die id */
256 id = cpu_map__get_die(map, idx, data);
257 if (cpu_map__aggr_cpu_id_is_empty(id))
261 * encode socket in bit range 31:24
262 * encode die id in bit range 23:16
263 * core_id is relative to socket and die,
264 * we need a global id. So we combine
265 * socket + die id + core id
267 if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n"))
268 return cpu_map__empty_aggr_cpu_id();
270 id.id = (id.id << 16) | (cpu & 0xffff);
274 struct aggr_cpu_id cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
276 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
278 if (idx < 0 || idx >= map->nr)
281 id.node = cpu_map__get_node_id(map->map[idx]);
285 int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **sockp)
287 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
290 int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **diep)
292 return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
295 int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **corep)
297 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
300 int cpu_map__build_node_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **numap)
302 return cpu_map__build_map(cpus, numap, cpu_map__get_node, NULL);
305 /* setup simple routines to easily access node numbers given a cpu number */
306 static int get_max_num(char *path, int *max)
312 if (filename__read_str(path, &buf, &num))
317 /* start on the right, to find highest node num */
319 if ((buf[num] == ',') || (buf[num] == '-')) {
324 if (sscanf(&buf[num], "%d", max) < 1) {
329 /* convert from 0-based to 1-based */
337 /* Determine highest possible cpu in the system for sparse allocation */
338 static void set_max_cpu_num(void)
346 max_present_cpu_num = 4096;
348 mnt = sysfs__mountpoint();
352 /* get the highest possible cpu number for a sparse allocation */
353 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
354 if (ret >= PATH_MAX) {
355 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
359 ret = get_max_num(path, &max_cpu_num);
363 /* get the highest present cpu number for a sparse allocation */
364 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
365 if (ret >= PATH_MAX) {
366 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
370 ret = get_max_num(path, &max_present_cpu_num);
374 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
377 /* Determine highest possible node in the system for sparse allocation */
378 static void set_max_node_num(void)
387 mnt = sysfs__mountpoint();
391 /* get the highest possible cpu number for a sparse allocation */
392 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
393 if (ret >= PATH_MAX) {
394 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
398 ret = get_max_num(path, &max_node_num);
402 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
405 int cpu__max_node(void)
407 if (unlikely(!max_node_num))
413 int cpu__max_cpu(void)
415 if (unlikely(!max_cpu_num))
421 int cpu__max_present_cpu(void)
423 if (unlikely(!max_present_cpu_num))
426 return max_present_cpu_num;
430 int cpu__get_node(int cpu)
432 if (unlikely(cpunode_map == NULL)) {
433 pr_debug("cpu_map not initialized\n");
437 return cpunode_map[cpu];
440 static int init_cpunode_map(void)
447 cpunode_map = calloc(max_cpu_num, sizeof(int));
449 pr_err("%s: calloc failed\n", __func__);
453 for (i = 0; i < max_cpu_num; i++)
459 int cpu__setup_cpunode_map(void)
461 struct dirent *dent1, *dent2;
463 unsigned int cpu, mem;
469 /* initialize globals */
470 if (init_cpunode_map())
473 mnt = sysfs__mountpoint();
477 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
479 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
483 dir1 = opendir(path);
487 /* walk tree and setup map */
488 while ((dent1 = readdir(dir1)) != NULL) {
489 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
492 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
494 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
501 while ((dent2 = readdir(dir2)) != NULL) {
502 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
504 cpunode_map[cpu] = mem;
512 bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
514 return perf_cpu_map__idx(cpus, cpu) != -1;
517 int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
519 return cpus->map[idx];
522 size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
524 int i, cpu, start = -1;
528 #define COMMA first ? "" : ","
530 for (i = 0; i < map->nr + 1; i++) {
531 bool last = i == map->nr;
533 cpu = last ? INT_MAX : map->map[i];
538 ret += snprintf(buf + ret, size - ret,
542 } else if (((i - start) != (cpu - map->map[start])) || last) {
546 ret += snprintf(buf + ret, size - ret,
550 ret += snprintf(buf + ret, size - ret,
552 map->map[start], map->map[end]);
561 pr_debug2("cpumask list: %s\n", buf);
565 static char hex_char(unsigned char val)
570 return val - 10 + 'a';
574 size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
578 unsigned char *bitmap;
579 int last_cpu = cpu_map__cpu(map, map->nr - 1);
584 bitmap = zalloc(last_cpu / 8 + 1);
585 if (bitmap == NULL) {
590 for (i = 0; i < map->nr; i++) {
591 cpu = cpu_map__cpu(map, i);
592 bitmap[cpu / 8] |= 1 << (cpu % 8);
595 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
596 unsigned char bits = bitmap[cpu / 8];
603 *ptr++ = hex_char(bits);
604 if ((cpu % 32) == 0 && cpu > 0)
610 buf[size - 1] = '\0';
614 const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
616 static const struct perf_cpu_map *online = NULL;
619 online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */
624 bool cpu_map__compare_aggr_cpu_id(struct aggr_cpu_id a, struct aggr_cpu_id b)
626 return a.id == b.id &&
630 bool cpu_map__aggr_cpu_id_is_empty(struct aggr_cpu_id a)
636 struct aggr_cpu_id cpu_map__empty_aggr_cpu_id(void)
638 struct aggr_cpu_id ret = {