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 struct aggr_cpu_id cpu_map__get_socket(struct perf_cpu_map *map, int idx,
115 void *data __maybe_unused)
118 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
125 id.id = cpu_map__get_socket_id(cpu);
129 static int cmp_aggr_cpu_id(const void *a_pointer, const void *b_pointer)
131 struct aggr_cpu_id *a = (struct aggr_cpu_id *)a_pointer;
132 struct aggr_cpu_id *b = (struct aggr_cpu_id *)b_pointer;
134 return a->id - b->id;
137 int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res,
138 struct aggr_cpu_id (*f)(struct perf_cpu_map *map, int cpu, void *data),
142 struct perf_cpu_map *c = perf_cpu_map__empty_new(nr);
144 struct aggr_cpu_id s1;
149 /* Reset size as it may only be partially filled */
152 for (cpu = 0; cpu < nr; cpu++) {
153 s1 = f(cpus, cpu, data);
154 for (s2 = 0; s2 < c->nr; s2++) {
155 if (s1.id == c->map[s2])
159 c->map[c->nr] = s1.id;
163 /* ensure we process id in increasing order */
164 qsort(c->map, c->nr, sizeof(struct aggr_cpu_id), cmp_aggr_cpu_id);
170 int cpu_map__get_die_id(int cpu)
172 int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
177 struct aggr_cpu_id cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
180 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
187 id.id = cpu_map__get_die_id(cpu);
188 /* There is no die_id on legacy system. */
192 s = cpu_map__get_socket(map, idx, data).id;
194 return cpu_map__empty_aggr_cpu_id();
197 * Encode socket in bit range 15:8
198 * die_id is relative to socket, and
199 * we need a global id. So we combine
202 if (WARN_ONCE(id.id >> 8, "The die id number is too big.\n"))
203 return cpu_map__empty_aggr_cpu_id();
205 if (WARN_ONCE(s >> 8, "The socket id number is too big.\n"))
206 return cpu_map__empty_aggr_cpu_id();
208 id.id = (s << 8) | (id.id & 0xff);
212 int cpu_map__get_core_id(int cpu)
214 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
218 int cpu_map__get_node_id(int cpu)
220 return cpu__get_node(cpu);
223 struct aggr_cpu_id cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
226 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
233 cpu = cpu_map__get_core_id(cpu);
235 /* cpu_map__get_die returns the combination of socket + die id */
236 id = cpu_map__get_die(map, idx, data);
237 if (cpu_map__aggr_cpu_id_is_empty(id))
241 * encode socket in bit range 31:24
242 * encode die id in bit range 23:16
243 * core_id is relative to socket and die,
244 * we need a global id. So we combine
245 * socket + die id + core id
247 if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n"))
248 return cpu_map__empty_aggr_cpu_id();
250 id.id = (id.id << 16) | (cpu & 0xffff);
254 struct aggr_cpu_id cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
256 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
258 if (idx < 0 || idx >= map->nr)
261 id.id = cpu_map__get_node_id(map->map[idx]);
265 int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp)
267 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
270 int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep)
272 return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
275 int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep)
277 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
280 int cpu_map__build_node_map(struct perf_cpu_map *cpus, struct perf_cpu_map **numap)
282 return cpu_map__build_map(cpus, numap, cpu_map__get_node, NULL);
285 /* setup simple routines to easily access node numbers given a cpu number */
286 static int get_max_num(char *path, int *max)
292 if (filename__read_str(path, &buf, &num))
297 /* start on the right, to find highest node num */
299 if ((buf[num] == ',') || (buf[num] == '-')) {
304 if (sscanf(&buf[num], "%d", max) < 1) {
309 /* convert from 0-based to 1-based */
317 /* Determine highest possible cpu in the system for sparse allocation */
318 static void set_max_cpu_num(void)
326 max_present_cpu_num = 4096;
328 mnt = sysfs__mountpoint();
332 /* get the highest possible cpu number for a sparse allocation */
333 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
334 if (ret >= PATH_MAX) {
335 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
339 ret = get_max_num(path, &max_cpu_num);
343 /* get the highest present cpu number for a sparse allocation */
344 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
345 if (ret >= PATH_MAX) {
346 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
350 ret = get_max_num(path, &max_present_cpu_num);
354 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
357 /* Determine highest possible node in the system for sparse allocation */
358 static void set_max_node_num(void)
367 mnt = sysfs__mountpoint();
371 /* get the highest possible cpu number for a sparse allocation */
372 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
373 if (ret >= PATH_MAX) {
374 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
378 ret = get_max_num(path, &max_node_num);
382 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
385 int cpu__max_node(void)
387 if (unlikely(!max_node_num))
393 int cpu__max_cpu(void)
395 if (unlikely(!max_cpu_num))
401 int cpu__max_present_cpu(void)
403 if (unlikely(!max_present_cpu_num))
406 return max_present_cpu_num;
410 int cpu__get_node(int cpu)
412 if (unlikely(cpunode_map == NULL)) {
413 pr_debug("cpu_map not initialized\n");
417 return cpunode_map[cpu];
420 static int init_cpunode_map(void)
427 cpunode_map = calloc(max_cpu_num, sizeof(int));
429 pr_err("%s: calloc failed\n", __func__);
433 for (i = 0; i < max_cpu_num; i++)
439 int cpu__setup_cpunode_map(void)
441 struct dirent *dent1, *dent2;
443 unsigned int cpu, mem;
449 /* initialize globals */
450 if (init_cpunode_map())
453 mnt = sysfs__mountpoint();
457 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
459 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
463 dir1 = opendir(path);
467 /* walk tree and setup map */
468 while ((dent1 = readdir(dir1)) != NULL) {
469 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
472 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
474 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
481 while ((dent2 = readdir(dir2)) != NULL) {
482 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
484 cpunode_map[cpu] = mem;
492 bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
494 return perf_cpu_map__idx(cpus, cpu) != -1;
497 int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
499 return cpus->map[idx];
502 size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
504 int i, cpu, start = -1;
508 #define COMMA first ? "" : ","
510 for (i = 0; i < map->nr + 1; i++) {
511 bool last = i == map->nr;
513 cpu = last ? INT_MAX : map->map[i];
518 ret += snprintf(buf + ret, size - ret,
522 } else if (((i - start) != (cpu - map->map[start])) || last) {
526 ret += snprintf(buf + ret, size - ret,
530 ret += snprintf(buf + ret, size - ret,
532 map->map[start], map->map[end]);
541 pr_debug2("cpumask list: %s\n", buf);
545 static char hex_char(unsigned char val)
550 return val - 10 + 'a';
554 size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
558 unsigned char *bitmap;
559 int last_cpu = cpu_map__cpu(map, map->nr - 1);
564 bitmap = zalloc(last_cpu / 8 + 1);
565 if (bitmap == NULL) {
570 for (i = 0; i < map->nr; i++) {
571 cpu = cpu_map__cpu(map, i);
572 bitmap[cpu / 8] |= 1 << (cpu % 8);
575 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
576 unsigned char bits = bitmap[cpu / 8];
583 *ptr++ = hex_char(bits);
584 if ((cpu % 32) == 0 && cpu > 0)
590 buf[size - 1] = '\0';
594 const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
596 static const struct perf_cpu_map *online = NULL;
599 online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */
604 bool cpu_map__compare_aggr_cpu_id(struct aggr_cpu_id a, struct aggr_cpu_id b)
609 bool cpu_map__aggr_cpu_id_is_empty(struct aggr_cpu_id a)
614 struct aggr_cpu_id cpu_map__empty_aggr_cpu_id(void)
616 struct aggr_cpu_id ret = {