9 #include <linux/bitmap.h>
12 #include "sane_ctype.h"
14 static int max_cpu_num;
15 static int max_present_cpu_num;
16 static int max_node_num;
17 static int *cpunode_map;
19 static struct cpu_map *cpu_map__default_new(void)
24 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
28 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
31 for (i = 0; i < nr_cpus; ++i)
35 refcount_set(&cpus->refcnt, 1);
41 static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
43 size_t payload_size = nr_cpus * sizeof(int);
44 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
48 memcpy(cpus->map, tmp_cpus, payload_size);
49 refcount_set(&cpus->refcnt, 1);
55 struct cpu_map *cpu_map__read(FILE *file)
57 struct cpu_map *cpus = NULL;
59 int *tmp_cpus = NULL, *tmp;
67 n = fscanf(file, "%u%c", &cpu, &sep);
71 int new_max = nr_cpus + cpu - prev - 1;
73 if (new_max >= max_entries) {
74 max_entries = new_max + MAX_NR_CPUS / 2;
75 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
82 tmp_cpus[nr_cpus++] = prev;
84 if (nr_cpus == max_entries) {
85 max_entries += MAX_NR_CPUS;
86 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
92 tmp_cpus[nr_cpus++] = cpu;
93 if (n == 2 && sep == '-')
97 if (n == 1 || sep == '\n')
102 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
104 cpus = cpu_map__default_new();
110 static struct cpu_map *cpu_map__read_all_cpu_map(void)
112 struct cpu_map *cpus = NULL;
115 onlnf = fopen("/sys/devices/system/cpu/online", "r");
117 return cpu_map__default_new();
119 cpus = cpu_map__read(onlnf);
124 struct cpu_map *cpu_map__new(const char *cpu_list)
126 struct cpu_map *cpus = NULL;
127 unsigned long start_cpu, end_cpu = 0;
130 int *tmp_cpus = NULL, *tmp;
134 return cpu_map__read_all_cpu_map();
136 if (!isdigit(*cpu_list))
139 while (isdigit(*cpu_list)) {
141 start_cpu = strtoul(cpu_list, &p, 0);
142 if (start_cpu >= INT_MAX
143 || (*p != '\0' && *p != ',' && *p != '-'))
149 end_cpu = strtoul(cpu_list, &p, 0);
151 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
154 if (end_cpu < start_cpu)
160 for (; start_cpu <= end_cpu; start_cpu++) {
161 /* check for duplicates */
162 for (i = 0; i < nr_cpus; i++)
163 if (tmp_cpus[i] == (int)start_cpu)
166 if (nr_cpus == max_entries) {
167 max_entries += MAX_NR_CPUS;
168 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
173 tmp_cpus[nr_cpus++] = (int)start_cpu;
182 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
184 cpus = cpu_map__default_new();
191 static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
195 map = cpu_map__empty_new(cpus->nr);
199 for (i = 0; i < cpus->nr; i++) {
201 * Special treatment for -1, which is not real cpu number,
202 * and we need to use (int) -1 to initialize map[i],
203 * otherwise it would become 65535.
205 if (cpus->cpu[i] == (u16) -1)
208 map->map[i] = (int) cpus->cpu[i];
215 static struct cpu_map *cpu_map__from_mask(struct cpu_map_mask *mask)
218 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
220 nr = bitmap_weight(mask->mask, nbits);
222 map = cpu_map__empty_new(nr);
226 for_each_set_bit(cpu, mask->mask, nbits)
233 struct cpu_map *cpu_map__new_data(struct cpu_map_data *data)
235 if (data->type == PERF_CPU_MAP__CPUS)
236 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
238 return cpu_map__from_mask((struct cpu_map_mask *)data->data);
241 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
246 cpu_map__snprint(map, buf, sizeof(buf));
247 return fprintf(fp, "%s\n", buf);
251 struct cpu_map *cpu_map__dummy_new(void)
253 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
258 refcount_set(&cpus->refcnt, 1);
264 struct cpu_map *cpu_map__empty_new(int nr)
266 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
272 for (i = 0; i < nr; i++)
275 refcount_set(&cpus->refcnt, 1);
281 static void cpu_map__delete(struct cpu_map *map)
284 WARN_ONCE(refcount_read(&map->refcnt) != 0,
285 "cpu_map refcnt unbalanced\n");
290 struct cpu_map *cpu_map__get(struct cpu_map *map)
293 refcount_inc(&map->refcnt);
297 void cpu_map__put(struct cpu_map *map)
299 if (map && refcount_dec_and_test(&map->refcnt))
300 cpu_map__delete(map);
303 static int cpu__get_topology_int(int cpu, const char *name, int *value)
307 snprintf(path, PATH_MAX,
308 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
310 return sysfs__read_int(path, value);
313 int cpu_map__get_socket_id(int cpu)
315 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
319 int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
328 return cpu_map__get_socket_id(cpu);
331 static int cmp_ids(const void *a, const void *b)
333 return *(int *)a - *(int *)b;
336 int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
337 int (*f)(struct cpu_map *map, int cpu, void *data),
344 /* allocate as much as possible */
345 c = calloc(1, sizeof(*c) + nr * sizeof(int));
349 for (cpu = 0; cpu < nr; cpu++) {
350 s1 = f(cpus, cpu, data);
351 for (s2 = 0; s2 < c->nr; s2++) {
352 if (s1 == c->map[s2])
360 /* ensure we process id in increasing order */
361 qsort(c->map, c->nr, sizeof(int), cmp_ids);
363 refcount_set(&c->refcnt, 1);
368 int cpu_map__get_core_id(int cpu)
370 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
374 int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
383 cpu = cpu_map__get_core_id(cpu);
385 s = cpu_map__get_socket(map, idx, data);
390 * encode socket in upper 16 bits
391 * core_id is relative to socket, and
392 * we need a global id. So we combine
395 return (s << 16) | (cpu & 0xffff);
398 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
400 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
403 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
405 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
408 /* setup simple routines to easily access node numbers given a cpu number */
409 static int get_max_num(char *path, int *max)
415 if (filename__read_str(path, &buf, &num))
420 /* start on the right, to find highest node num */
422 if ((buf[num] == ',') || (buf[num] == '-')) {
427 if (sscanf(&buf[num], "%d", max) < 1) {
432 /* convert from 0-based to 1-based */
440 /* Determine highest possible cpu in the system for sparse allocation */
441 static void set_max_cpu_num(void)
449 max_present_cpu_num = 4096;
451 mnt = sysfs__mountpoint();
455 /* get the highest possible cpu number for a sparse allocation */
456 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
457 if (ret == PATH_MAX) {
458 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
462 ret = get_max_num(path, &max_cpu_num);
466 /* get the highest present cpu number for a sparse allocation */
467 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
468 if (ret == PATH_MAX) {
469 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
473 ret = get_max_num(path, &max_present_cpu_num);
477 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
480 /* Determine highest possible node in the system for sparse allocation */
481 static void set_max_node_num(void)
490 mnt = sysfs__mountpoint();
494 /* get the highest possible cpu number for a sparse allocation */
495 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
496 if (ret == PATH_MAX) {
497 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
501 ret = get_max_num(path, &max_node_num);
505 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
508 int cpu__max_node(void)
510 if (unlikely(!max_node_num))
516 int cpu__max_cpu(void)
518 if (unlikely(!max_cpu_num))
524 int cpu__max_present_cpu(void)
526 if (unlikely(!max_present_cpu_num))
529 return max_present_cpu_num;
533 int cpu__get_node(int cpu)
535 if (unlikely(cpunode_map == NULL)) {
536 pr_debug("cpu_map not initialized\n");
540 return cpunode_map[cpu];
543 static int init_cpunode_map(void)
550 cpunode_map = calloc(max_cpu_num, sizeof(int));
552 pr_err("%s: calloc failed\n", __func__);
556 for (i = 0; i < max_cpu_num; i++)
562 int cpu__setup_cpunode_map(void)
564 struct dirent *dent1, *dent2;
566 unsigned int cpu, mem;
572 /* initialize globals */
573 if (init_cpunode_map())
576 mnt = sysfs__mountpoint();
580 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
582 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
586 dir1 = opendir(path);
590 /* walk tree and setup map */
591 while ((dent1 = readdir(dir1)) != NULL) {
592 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
595 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
597 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
604 while ((dent2 = readdir(dir2)) != NULL) {
605 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
607 cpunode_map[cpu] = mem;
615 bool cpu_map__has(struct cpu_map *cpus, int cpu)
617 return cpu_map__idx(cpus, cpu) != -1;
620 int cpu_map__idx(struct cpu_map *cpus, int cpu)
624 for (i = 0; i < cpus->nr; ++i) {
625 if (cpus->map[i] == cpu)
632 int cpu_map__cpu(struct cpu_map *cpus, int idx)
634 return cpus->map[idx];
637 size_t cpu_map__snprint(struct cpu_map *map, char *buf, size_t size)
639 int i, cpu, start = -1;
643 #define COMMA first ? "" : ","
645 for (i = 0; i < map->nr + 1; i++) {
646 bool last = i == map->nr;
648 cpu = last ? INT_MAX : map->map[i];
653 ret += snprintf(buf + ret, size - ret,
657 } else if (((i - start) != (cpu - map->map[start])) || last) {
661 ret += snprintf(buf + ret, size - ret,
665 ret += snprintf(buf + ret, size - ret,
667 map->map[start], map->map[end]);
676 pr_debug("cpumask list: %s\n", buf);
680 static char hex_char(unsigned char val)
685 return val - 10 + 'a';
689 size_t cpu_map__snprint_mask(struct cpu_map *map, char *buf, size_t size)
693 unsigned char *bitmap;
694 int last_cpu = cpu_map__cpu(map, map->nr - 1);
696 bitmap = zalloc((last_cpu + 7) / 8);
697 if (bitmap == NULL) {
702 for (i = 0; i < map->nr; i++) {
703 cpu = cpu_map__cpu(map, i);
704 bitmap[cpu / 8] |= 1 << (cpu % 8);
707 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
708 unsigned char bits = bitmap[cpu / 8];
715 *ptr++ = hex_char(bits);
716 if ((cpu % 32) == 0 && cpu > 0)
722 buf[size - 1] = '\0';