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();
138 * must handle the case of empty cpumap to cover
139 * TOPOLOGY header for NUMA nodes with no CPU
140 * ( e.g., because of CPU hotplug)
142 if (!isdigit(*cpu_list) && *cpu_list != '\0')
145 while (isdigit(*cpu_list)) {
147 start_cpu = strtoul(cpu_list, &p, 0);
148 if (start_cpu >= INT_MAX
149 || (*p != '\0' && *p != ',' && *p != '-'))
155 end_cpu = strtoul(cpu_list, &p, 0);
157 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
160 if (end_cpu < start_cpu)
166 for (; start_cpu <= end_cpu; start_cpu++) {
167 /* check for duplicates */
168 for (i = 0; i < nr_cpus; i++)
169 if (tmp_cpus[i] == (int)start_cpu)
172 if (nr_cpus == max_entries) {
173 max_entries += MAX_NR_CPUS;
174 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
179 tmp_cpus[nr_cpus++] = (int)start_cpu;
188 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
189 else if (*cpu_list != '\0')
190 cpus = cpu_map__default_new();
192 cpus = cpu_map__dummy_new();
199 static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
203 map = cpu_map__empty_new(cpus->nr);
207 for (i = 0; i < cpus->nr; i++) {
209 * Special treatment for -1, which is not real cpu number,
210 * and we need to use (int) -1 to initialize map[i],
211 * otherwise it would become 65535.
213 if (cpus->cpu[i] == (u16) -1)
216 map->map[i] = (int) cpus->cpu[i];
223 static struct cpu_map *cpu_map__from_mask(struct cpu_map_mask *mask)
226 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
228 nr = bitmap_weight(mask->mask, nbits);
230 map = cpu_map__empty_new(nr);
234 for_each_set_bit(cpu, mask->mask, nbits)
241 struct cpu_map *cpu_map__new_data(struct cpu_map_data *data)
243 if (data->type == PERF_CPU_MAP__CPUS)
244 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
246 return cpu_map__from_mask((struct cpu_map_mask *)data->data);
249 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
254 cpu_map__snprint(map, buf, sizeof(buf));
255 return fprintf(fp, "%s\n", buf);
259 struct cpu_map *cpu_map__dummy_new(void)
261 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
266 refcount_set(&cpus->refcnt, 1);
272 struct cpu_map *cpu_map__empty_new(int nr)
274 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
280 for (i = 0; i < nr; i++)
283 refcount_set(&cpus->refcnt, 1);
289 static void cpu_map__delete(struct cpu_map *map)
292 WARN_ONCE(refcount_read(&map->refcnt) != 0,
293 "cpu_map refcnt unbalanced\n");
298 struct cpu_map *cpu_map__get(struct cpu_map *map)
301 refcount_inc(&map->refcnt);
305 void cpu_map__put(struct cpu_map *map)
307 if (map && refcount_dec_and_test(&map->refcnt))
308 cpu_map__delete(map);
311 static int cpu__get_topology_int(int cpu, const char *name, int *value)
315 snprintf(path, PATH_MAX,
316 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
318 return sysfs__read_int(path, value);
321 int cpu_map__get_socket_id(int cpu)
323 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
327 int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
336 return cpu_map__get_socket_id(cpu);
339 static int cmp_ids(const void *a, const void *b)
341 return *(int *)a - *(int *)b;
344 int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
345 int (*f)(struct cpu_map *map, int cpu, void *data),
352 /* allocate as much as possible */
353 c = calloc(1, sizeof(*c) + nr * sizeof(int));
357 for (cpu = 0; cpu < nr; cpu++) {
358 s1 = f(cpus, cpu, data);
359 for (s2 = 0; s2 < c->nr; s2++) {
360 if (s1 == c->map[s2])
368 /* ensure we process id in increasing order */
369 qsort(c->map, c->nr, sizeof(int), cmp_ids);
371 refcount_set(&c->refcnt, 1);
376 int cpu_map__get_core_id(int cpu)
378 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
382 int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
391 cpu = cpu_map__get_core_id(cpu);
393 s = cpu_map__get_socket(map, idx, data);
398 * encode socket in upper 16 bits
399 * core_id is relative to socket, and
400 * we need a global id. So we combine
403 return (s << 16) | (cpu & 0xffff);
406 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
408 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
411 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
413 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
416 /* setup simple routines to easily access node numbers given a cpu number */
417 static int get_max_num(char *path, int *max)
423 if (filename__read_str(path, &buf, &num))
428 /* start on the right, to find highest node num */
430 if ((buf[num] == ',') || (buf[num] == '-')) {
435 if (sscanf(&buf[num], "%d", max) < 1) {
440 /* convert from 0-based to 1-based */
448 /* Determine highest possible cpu in the system for sparse allocation */
449 static void set_max_cpu_num(void)
457 max_present_cpu_num = 4096;
459 mnt = sysfs__mountpoint();
463 /* get the highest possible cpu number for a sparse allocation */
464 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
465 if (ret >= PATH_MAX) {
466 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
470 ret = get_max_num(path, &max_cpu_num);
474 /* get the highest present cpu number for a sparse allocation */
475 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
476 if (ret >= PATH_MAX) {
477 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
481 ret = get_max_num(path, &max_present_cpu_num);
485 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
488 /* Determine highest possible node in the system for sparse allocation */
489 static void set_max_node_num(void)
498 mnt = sysfs__mountpoint();
502 /* get the highest possible cpu number for a sparse allocation */
503 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
504 if (ret >= PATH_MAX) {
505 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
509 ret = get_max_num(path, &max_node_num);
513 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
516 int cpu__max_node(void)
518 if (unlikely(!max_node_num))
524 int cpu__max_cpu(void)
526 if (unlikely(!max_cpu_num))
532 int cpu__max_present_cpu(void)
534 if (unlikely(!max_present_cpu_num))
537 return max_present_cpu_num;
541 int cpu__get_node(int cpu)
543 if (unlikely(cpunode_map == NULL)) {
544 pr_debug("cpu_map not initialized\n");
548 return cpunode_map[cpu];
551 static int init_cpunode_map(void)
558 cpunode_map = calloc(max_cpu_num, sizeof(int));
560 pr_err("%s: calloc failed\n", __func__);
564 for (i = 0; i < max_cpu_num; i++)
570 int cpu__setup_cpunode_map(void)
572 struct dirent *dent1, *dent2;
574 unsigned int cpu, mem;
580 /* initialize globals */
581 if (init_cpunode_map())
584 mnt = sysfs__mountpoint();
588 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
590 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
594 dir1 = opendir(path);
598 /* walk tree and setup map */
599 while ((dent1 = readdir(dir1)) != NULL) {
600 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
603 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
605 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
612 while ((dent2 = readdir(dir2)) != NULL) {
613 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
615 cpunode_map[cpu] = mem;
623 bool cpu_map__has(struct cpu_map *cpus, int cpu)
625 return cpu_map__idx(cpus, cpu) != -1;
628 int cpu_map__idx(struct cpu_map *cpus, int cpu)
632 for (i = 0; i < cpus->nr; ++i) {
633 if (cpus->map[i] == cpu)
640 int cpu_map__cpu(struct cpu_map *cpus, int idx)
642 return cpus->map[idx];
645 size_t cpu_map__snprint(struct cpu_map *map, char *buf, size_t size)
647 int i, cpu, start = -1;
651 #define COMMA first ? "" : ","
653 for (i = 0; i < map->nr + 1; i++) {
654 bool last = i == map->nr;
656 cpu = last ? INT_MAX : map->map[i];
661 ret += snprintf(buf + ret, size - ret,
665 } else if (((i - start) != (cpu - map->map[start])) || last) {
669 ret += snprintf(buf + ret, size - ret,
673 ret += snprintf(buf + ret, size - ret,
675 map->map[start], map->map[end]);
684 pr_debug("cpumask list: %s\n", buf);
688 static char hex_char(unsigned char val)
693 return val - 10 + 'a';
697 size_t cpu_map__snprint_mask(struct cpu_map *map, char *buf, size_t size)
701 unsigned char *bitmap;
702 int last_cpu = cpu_map__cpu(map, map->nr - 1);
707 bitmap = zalloc(last_cpu / 8 + 1);
708 if (bitmap == NULL) {
713 for (i = 0; i < map->nr; i++) {
714 cpu = cpu_map__cpu(map, i);
715 bitmap[cpu / 8] |= 1 << (cpu % 8);
718 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
719 unsigned char bits = bitmap[cpu / 8];
726 *ptr++ = hex_char(bits);
727 if ((cpu % 32) == 0 && cpu > 0)
733 buf[size - 1] = '\0';