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.socket = 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;
151 if (a->node != b->node)
152 return a->node - b->node;
153 else if (a->socket != b->socket)
154 return a->socket - b->socket;
155 else if (a->die != b->die)
156 return a->die - b->die;
157 else if (a->core != b->core)
158 return a->core - b->core;
160 return a->thread - b->thread;
163 int cpu_map__build_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **res,
164 struct aggr_cpu_id (*f)(struct perf_cpu_map *map, int cpu, void *data),
168 struct cpu_aggr_map *c = cpu_aggr_map__empty_new(nr);
170 struct aggr_cpu_id s1;
175 /* Reset size as it may only be partially filled */
178 for (cpu = 0; cpu < nr; cpu++) {
179 s1 = f(cpus, cpu, data);
180 for (s2 = 0; s2 < c->nr; s2++) {
181 if (cpu_map__compare_aggr_cpu_id(s1, c->map[s2]))
189 /* ensure we process id in increasing order */
190 qsort(c->map, c->nr, sizeof(struct aggr_cpu_id), cmp_aggr_cpu_id);
196 int cpu_map__get_die_id(int cpu)
198 int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
203 struct aggr_cpu_id cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
206 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
213 die = cpu_map__get_die_id(cpu);
214 /* There is no die_id on legacy system. */
219 * die_id is relative to socket, so start
220 * with the socket ID and then add die to
223 id = cpu_map__get_socket(map, idx, data);
224 if (cpu_map__aggr_cpu_id_is_empty(id))
231 int cpu_map__get_core_id(int cpu)
233 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
237 int cpu_map__get_node_id(int cpu)
239 return cpu__get_node(cpu);
242 struct aggr_cpu_id cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
245 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
252 cpu = cpu_map__get_core_id(cpu);
254 /* cpu_map__get_die returns a struct with socket and die set*/
255 id = cpu_map__get_die(map, idx, data);
256 if (cpu_map__aggr_cpu_id_is_empty(id))
260 * core_id is relative to socket and die, we need a global id.
261 * So we combine the result from cpu_map__get_die with the core id
267 struct aggr_cpu_id cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
269 struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
271 if (idx < 0 || idx >= map->nr)
274 id.node = cpu_map__get_node_id(map->map[idx]);
278 int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **sockp)
280 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
283 int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **diep)
285 return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
288 int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **corep)
290 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
293 int cpu_map__build_node_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **numap)
295 return cpu_map__build_map(cpus, numap, cpu_map__get_node, NULL);
298 /* setup simple routines to easily access node numbers given a cpu number */
299 static int get_max_num(char *path, int *max)
305 if (filename__read_str(path, &buf, &num))
310 /* start on the right, to find highest node num */
312 if ((buf[num] == ',') || (buf[num] == '-')) {
317 if (sscanf(&buf[num], "%d", max) < 1) {
322 /* convert from 0-based to 1-based */
330 /* Determine highest possible cpu in the system for sparse allocation */
331 static void set_max_cpu_num(void)
339 max_present_cpu_num = 4096;
341 mnt = sysfs__mountpoint();
345 /* get the highest possible cpu number for a sparse allocation */
346 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
347 if (ret >= PATH_MAX) {
348 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
352 ret = get_max_num(path, &max_cpu_num);
356 /* get the highest present cpu number for a sparse allocation */
357 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
358 if (ret >= PATH_MAX) {
359 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
363 ret = get_max_num(path, &max_present_cpu_num);
367 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
370 /* Determine highest possible node in the system for sparse allocation */
371 static void set_max_node_num(void)
380 mnt = sysfs__mountpoint();
384 /* get the highest possible cpu number for a sparse allocation */
385 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
386 if (ret >= PATH_MAX) {
387 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
391 ret = get_max_num(path, &max_node_num);
395 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
398 int cpu__max_node(void)
400 if (unlikely(!max_node_num))
406 int cpu__max_cpu(void)
408 if (unlikely(!max_cpu_num))
414 int cpu__max_present_cpu(void)
416 if (unlikely(!max_present_cpu_num))
419 return max_present_cpu_num;
423 int cpu__get_node(int cpu)
425 if (unlikely(cpunode_map == NULL)) {
426 pr_debug("cpu_map not initialized\n");
430 return cpunode_map[cpu];
433 static int init_cpunode_map(void)
440 cpunode_map = calloc(max_cpu_num, sizeof(int));
442 pr_err("%s: calloc failed\n", __func__);
446 for (i = 0; i < max_cpu_num; i++)
452 int cpu__setup_cpunode_map(void)
454 struct dirent *dent1, *dent2;
456 unsigned int cpu, mem;
462 /* initialize globals */
463 if (init_cpunode_map())
466 mnt = sysfs__mountpoint();
470 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
472 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
476 dir1 = opendir(path);
480 /* walk tree and setup map */
481 while ((dent1 = readdir(dir1)) != NULL) {
482 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
485 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
487 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
494 while ((dent2 = readdir(dir2)) != NULL) {
495 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
497 cpunode_map[cpu] = mem;
505 bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
507 return perf_cpu_map__idx(cpus, cpu) != -1;
510 int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
512 return cpus->map[idx];
515 size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
517 int i, cpu, start = -1;
521 #define COMMA first ? "" : ","
523 for (i = 0; i < map->nr + 1; i++) {
524 bool last = i == map->nr;
526 cpu = last ? INT_MAX : map->map[i];
531 ret += snprintf(buf + ret, size - ret,
535 } else if (((i - start) != (cpu - map->map[start])) || last) {
539 ret += snprintf(buf + ret, size - ret,
543 ret += snprintf(buf + ret, size - ret,
545 map->map[start], map->map[end]);
554 pr_debug2("cpumask list: %s\n", buf);
558 static char hex_char(unsigned char val)
563 return val - 10 + 'a';
567 size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
571 unsigned char *bitmap;
572 int last_cpu = cpu_map__cpu(map, map->nr - 1);
577 bitmap = zalloc(last_cpu / 8 + 1);
578 if (bitmap == NULL) {
583 for (i = 0; i < map->nr; i++) {
584 cpu = cpu_map__cpu(map, i);
585 bitmap[cpu / 8] |= 1 << (cpu % 8);
588 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
589 unsigned char bits = bitmap[cpu / 8];
596 *ptr++ = hex_char(bits);
597 if ((cpu % 32) == 0 && cpu > 0)
603 buf[size - 1] = '\0';
607 const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
609 static const struct perf_cpu_map *online = NULL;
612 online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */
617 bool cpu_map__compare_aggr_cpu_id(struct aggr_cpu_id a, struct aggr_cpu_id b)
619 return a.thread == b.thread &&
621 a.socket == b.socket &&
626 bool cpu_map__aggr_cpu_id_is_empty(struct aggr_cpu_id a)
628 return a.thread == -1 &&
635 struct aggr_cpu_id cpu_map__empty_aggr_cpu_id(void)
637 struct aggr_cpu_id ret = {