1 // SPDX-License-Identifier: GPL-2.0
10 #include <linux/bitmap.h>
13 #include "sane_ctype.h"
15 static int max_cpu_num;
16 static int max_present_cpu_num;
17 static int max_node_num;
18 static int *cpunode_map;
20 static struct cpu_map *cpu_map__default_new(void)
25 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
29 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
32 for (i = 0; i < nr_cpus; ++i)
36 refcount_set(&cpus->refcnt, 1);
42 static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
44 size_t payload_size = nr_cpus * sizeof(int);
45 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
49 memcpy(cpus->map, tmp_cpus, payload_size);
50 refcount_set(&cpus->refcnt, 1);
56 struct cpu_map *cpu_map__read(FILE *file)
58 struct cpu_map *cpus = NULL;
60 int *tmp_cpus = NULL, *tmp;
68 n = fscanf(file, "%u%c", &cpu, &sep);
72 int new_max = nr_cpus + cpu - prev - 1;
74 if (new_max >= max_entries) {
75 max_entries = new_max + MAX_NR_CPUS / 2;
76 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
83 tmp_cpus[nr_cpus++] = prev;
85 if (nr_cpus == max_entries) {
86 max_entries += MAX_NR_CPUS;
87 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
93 tmp_cpus[nr_cpus++] = cpu;
94 if (n == 2 && sep == '-')
98 if (n == 1 || sep == '\n')
103 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
105 cpus = cpu_map__default_new();
111 static struct cpu_map *cpu_map__read_all_cpu_map(void)
113 struct cpu_map *cpus = NULL;
116 onlnf = fopen("/sys/devices/system/cpu/online", "r");
118 return cpu_map__default_new();
120 cpus = cpu_map__read(onlnf);
125 struct cpu_map *cpu_map__new(const char *cpu_list)
127 struct cpu_map *cpus = NULL;
128 unsigned long start_cpu, end_cpu = 0;
131 int *tmp_cpus = NULL, *tmp;
135 return cpu_map__read_all_cpu_map();
137 if (!isdigit(*cpu_list))
140 while (isdigit(*cpu_list)) {
142 start_cpu = strtoul(cpu_list, &p, 0);
143 if (start_cpu >= INT_MAX
144 || (*p != '\0' && *p != ',' && *p != '-'))
150 end_cpu = strtoul(cpu_list, &p, 0);
152 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
155 if (end_cpu < start_cpu)
161 for (; start_cpu <= end_cpu; start_cpu++) {
162 /* check for duplicates */
163 for (i = 0; i < nr_cpus; i++)
164 if (tmp_cpus[i] == (int)start_cpu)
167 if (nr_cpus == max_entries) {
168 max_entries += MAX_NR_CPUS;
169 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
174 tmp_cpus[nr_cpus++] = (int)start_cpu;
183 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
185 cpus = cpu_map__default_new();
192 static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
196 map = cpu_map__empty_new(cpus->nr);
200 for (i = 0; i < cpus->nr; i++) {
202 * Special treatment for -1, which is not real cpu number,
203 * and we need to use (int) -1 to initialize map[i],
204 * otherwise it would become 65535.
206 if (cpus->cpu[i] == (u16) -1)
209 map->map[i] = (int) cpus->cpu[i];
216 static struct cpu_map *cpu_map__from_mask(struct cpu_map_mask *mask)
219 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
221 nr = bitmap_weight(mask->mask, nbits);
223 map = cpu_map__empty_new(nr);
227 for_each_set_bit(cpu, mask->mask, nbits)
234 struct cpu_map *cpu_map__new_data(struct cpu_map_data *data)
236 if (data->type == PERF_CPU_MAP__CPUS)
237 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
239 return cpu_map__from_mask((struct cpu_map_mask *)data->data);
242 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
247 cpu_map__snprint(map, buf, sizeof(buf));
248 return fprintf(fp, "%s\n", buf);
252 struct cpu_map *cpu_map__dummy_new(void)
254 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
259 refcount_set(&cpus->refcnt, 1);
265 struct cpu_map *cpu_map__empty_new(int nr)
267 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
273 for (i = 0; i < nr; i++)
276 refcount_set(&cpus->refcnt, 1);
282 static void cpu_map__delete(struct cpu_map *map)
285 WARN_ONCE(refcount_read(&map->refcnt) != 0,
286 "cpu_map refcnt unbalanced\n");
291 struct cpu_map *cpu_map__get(struct cpu_map *map)
294 refcount_inc(&map->refcnt);
298 void cpu_map__put(struct cpu_map *map)
300 if (map && refcount_dec_and_test(&map->refcnt))
301 cpu_map__delete(map);
304 static int cpu__get_topology_int(int cpu, const char *name, int *value)
308 snprintf(path, PATH_MAX,
309 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
311 return sysfs__read_int(path, value);
314 int cpu_map__get_socket_id(int cpu)
316 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
320 int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
329 return cpu_map__get_socket_id(cpu);
332 static int cmp_ids(const void *a, const void *b)
334 return *(int *)a - *(int *)b;
337 int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
338 int (*f)(struct cpu_map *map, int cpu, void *data),
345 /* allocate as much as possible */
346 c = calloc(1, sizeof(*c) + nr * sizeof(int));
350 for (cpu = 0; cpu < nr; cpu++) {
351 s1 = f(cpus, cpu, data);
352 for (s2 = 0; s2 < c->nr; s2++) {
353 if (s1 == c->map[s2])
361 /* ensure we process id in increasing order */
362 qsort(c->map, c->nr, sizeof(int), cmp_ids);
364 refcount_set(&c->refcnt, 1);
369 int cpu_map__get_core_id(int cpu)
371 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
375 int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
384 cpu = cpu_map__get_core_id(cpu);
386 s = cpu_map__get_socket(map, idx, data);
391 * encode socket in upper 16 bits
392 * core_id is relative to socket, and
393 * we need a global id. So we combine
396 return (s << 16) | (cpu & 0xffff);
399 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
401 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
404 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
406 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
409 /* setup simple routines to easily access node numbers given a cpu number */
410 static int get_max_num(char *path, int *max)
416 if (filename__read_str(path, &buf, &num))
421 /* start on the right, to find highest node num */
423 if ((buf[num] == ',') || (buf[num] == '-')) {
428 if (sscanf(&buf[num], "%d", max) < 1) {
433 /* convert from 0-based to 1-based */
441 /* Determine highest possible cpu in the system for sparse allocation */
442 static void set_max_cpu_num(void)
450 max_present_cpu_num = 4096;
452 mnt = sysfs__mountpoint();
456 /* get the highest possible cpu number for a sparse allocation */
457 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
458 if (ret == PATH_MAX) {
459 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
463 ret = get_max_num(path, &max_cpu_num);
467 /* get the highest present cpu number for a sparse allocation */
468 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
469 if (ret == PATH_MAX) {
470 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
474 ret = get_max_num(path, &max_present_cpu_num);
478 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
481 /* Determine highest possible node in the system for sparse allocation */
482 static void set_max_node_num(void)
491 mnt = sysfs__mountpoint();
495 /* get the highest possible cpu number for a sparse allocation */
496 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
497 if (ret == PATH_MAX) {
498 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
502 ret = get_max_num(path, &max_node_num);
506 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
509 int cpu__max_node(void)
511 if (unlikely(!max_node_num))
517 int cpu__max_cpu(void)
519 if (unlikely(!max_cpu_num))
525 int cpu__max_present_cpu(void)
527 if (unlikely(!max_present_cpu_num))
530 return max_present_cpu_num;
534 int cpu__get_node(int cpu)
536 if (unlikely(cpunode_map == NULL)) {
537 pr_debug("cpu_map not initialized\n");
541 return cpunode_map[cpu];
544 static int init_cpunode_map(void)
551 cpunode_map = calloc(max_cpu_num, sizeof(int));
553 pr_err("%s: calloc failed\n", __func__);
557 for (i = 0; i < max_cpu_num; i++)
563 int cpu__setup_cpunode_map(void)
565 struct dirent *dent1, *dent2;
567 unsigned int cpu, mem;
573 /* initialize globals */
574 if (init_cpunode_map())
577 mnt = sysfs__mountpoint();
581 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
583 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
587 dir1 = opendir(path);
591 /* walk tree and setup map */
592 while ((dent1 = readdir(dir1)) != NULL) {
593 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
596 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
598 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
605 while ((dent2 = readdir(dir2)) != NULL) {
606 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
608 cpunode_map[cpu] = mem;
616 bool cpu_map__has(struct cpu_map *cpus, int cpu)
618 return cpu_map__idx(cpus, cpu) != -1;
621 int cpu_map__idx(struct cpu_map *cpus, int cpu)
625 for (i = 0; i < cpus->nr; ++i) {
626 if (cpus->map[i] == cpu)
633 int cpu_map__cpu(struct cpu_map *cpus, int idx)
635 return cpus->map[idx];
638 size_t cpu_map__snprint(struct cpu_map *map, char *buf, size_t size)
640 int i, cpu, start = -1;
644 #define COMMA first ? "" : ","
646 for (i = 0; i < map->nr + 1; i++) {
647 bool last = i == map->nr;
649 cpu = last ? INT_MAX : map->map[i];
654 ret += snprintf(buf + ret, size - ret,
658 } else if (((i - start) != (cpu - map->map[start])) || last) {
662 ret += snprintf(buf + ret, size - ret,
666 ret += snprintf(buf + ret, size - ret,
668 map->map[start], map->map[end]);
677 pr_debug("cpumask list: %s\n", buf);
681 static char hex_char(unsigned char val)
686 return val - 10 + 'a';
690 size_t cpu_map__snprint_mask(struct cpu_map *map, char *buf, size_t size)
694 unsigned char *bitmap;
695 int last_cpu = cpu_map__cpu(map, map->nr - 1);
697 bitmap = zalloc((last_cpu + 7) / 8);
698 if (bitmap == NULL) {
703 for (i = 0; i < map->nr; i++) {
704 cpu = cpu_map__cpu(map, i);
705 bitmap[cpu / 8] |= 1 << (cpu % 8);
708 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
709 unsigned char bits = bitmap[cpu / 8];
716 *ptr++ = hex_char(bits);
717 if ((cpu % 32) == 0 && cpu > 0)
723 buf[size - 1] = '\0';