8 #include <linux/bitmap.h>
11 static int max_cpu_num;
12 static int max_node_num;
13 static int *cpunode_map;
15 static struct cpu_map *cpu_map__default_new(void)
20 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
24 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
27 for (i = 0; i < nr_cpus; ++i)
31 atomic_set(&cpus->refcnt, 1);
37 static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
39 size_t payload_size = nr_cpus * sizeof(int);
40 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
44 memcpy(cpus->map, tmp_cpus, payload_size);
45 atomic_set(&cpus->refcnt, 1);
51 struct cpu_map *cpu_map__read(FILE *file)
53 struct cpu_map *cpus = NULL;
55 int *tmp_cpus = NULL, *tmp;
63 n = fscanf(file, "%u%c", &cpu, &sep);
67 int new_max = nr_cpus + cpu - prev - 1;
69 if (new_max >= max_entries) {
70 max_entries = new_max + MAX_NR_CPUS / 2;
71 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
78 tmp_cpus[nr_cpus++] = prev;
80 if (nr_cpus == max_entries) {
81 max_entries += MAX_NR_CPUS;
82 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
88 tmp_cpus[nr_cpus++] = cpu;
89 if (n == 2 && sep == '-')
93 if (n == 1 || sep == '\n')
98 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
100 cpus = cpu_map__default_new();
106 static struct cpu_map *cpu_map__read_all_cpu_map(void)
108 struct cpu_map *cpus = NULL;
111 onlnf = fopen("/sys/devices/system/cpu/online", "r");
113 return cpu_map__default_new();
115 cpus = cpu_map__read(onlnf);
120 struct cpu_map *cpu_map__new(const char *cpu_list)
122 struct cpu_map *cpus = NULL;
123 unsigned long start_cpu, end_cpu = 0;
126 int *tmp_cpus = NULL, *tmp;
130 return cpu_map__read_all_cpu_map();
132 if (!isdigit(*cpu_list))
135 while (isdigit(*cpu_list)) {
137 start_cpu = strtoul(cpu_list, &p, 0);
138 if (start_cpu >= INT_MAX
139 || (*p != '\0' && *p != ',' && *p != '-'))
145 end_cpu = strtoul(cpu_list, &p, 0);
147 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
150 if (end_cpu < start_cpu)
156 for (; start_cpu <= end_cpu; start_cpu++) {
157 /* check for duplicates */
158 for (i = 0; i < nr_cpus; i++)
159 if (tmp_cpus[i] == (int)start_cpu)
162 if (nr_cpus == max_entries) {
163 max_entries += MAX_NR_CPUS;
164 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
169 tmp_cpus[nr_cpus++] = (int)start_cpu;
178 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
180 cpus = cpu_map__default_new();
187 static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
191 map = cpu_map__empty_new(cpus->nr);
195 for (i = 0; i < cpus->nr; i++) {
197 * Special treatment for -1, which is not real cpu number,
198 * and we need to use (int) -1 to initialize map[i],
199 * otherwise it would become 65535.
201 if (cpus->cpu[i] == (u16) -1)
204 map->map[i] = (int) cpus->cpu[i];
211 static struct cpu_map *cpu_map__from_mask(struct cpu_map_mask *mask)
214 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
216 nr = bitmap_weight(mask->mask, nbits);
218 map = cpu_map__empty_new(nr);
222 for_each_set_bit(cpu, mask->mask, nbits)
229 struct cpu_map *cpu_map__new_data(struct cpu_map_data *data)
231 if (data->type == PERF_CPU_MAP__CPUS)
232 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
234 return cpu_map__from_mask((struct cpu_map_mask *)data->data);
237 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
240 size_t printed = fprintf(fp, "%d cpu%s: ",
241 map->nr, map->nr > 1 ? "s" : "");
242 for (i = 0; i < map->nr; ++i)
243 printed += fprintf(fp, "%s%d", i ? ", " : "", map->map[i]);
245 return printed + fprintf(fp, "\n");
248 struct cpu_map *cpu_map__dummy_new(void)
250 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
255 atomic_set(&cpus->refcnt, 1);
261 struct cpu_map *cpu_map__empty_new(int nr)
263 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
269 for (i = 0; i < nr; i++)
272 atomic_set(&cpus->refcnt, 1);
278 static void cpu_map__delete(struct cpu_map *map)
281 WARN_ONCE(atomic_read(&map->refcnt) != 0,
282 "cpu_map refcnt unbalanced\n");
287 struct cpu_map *cpu_map__get(struct cpu_map *map)
290 atomic_inc(&map->refcnt);
294 void cpu_map__put(struct cpu_map *map)
296 if (map && atomic_dec_and_test(&map->refcnt))
297 cpu_map__delete(map);
300 static int cpu__get_topology_int(int cpu, const char *name, int *value)
304 snprintf(path, PATH_MAX,
305 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
307 return sysfs__read_int(path, value);
310 int cpu_map__get_socket_id(int cpu)
312 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
316 int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
325 return cpu_map__get_socket_id(cpu);
328 static int cmp_ids(const void *a, const void *b)
330 return *(int *)a - *(int *)b;
333 int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
334 int (*f)(struct cpu_map *map, int cpu, void *data),
341 /* allocate as much as possible */
342 c = calloc(1, sizeof(*c) + nr * sizeof(int));
346 for (cpu = 0; cpu < nr; cpu++) {
347 s1 = f(cpus, cpu, data);
348 for (s2 = 0; s2 < c->nr; s2++) {
349 if (s1 == c->map[s2])
357 /* ensure we process id in increasing order */
358 qsort(c->map, c->nr, sizeof(int), cmp_ids);
360 atomic_set(&c->refcnt, 1);
365 int cpu_map__get_core_id(int cpu)
367 int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
371 int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
380 cpu = cpu_map__get_core_id(cpu);
382 s = cpu_map__get_socket(map, idx, data);
387 * encode socket in upper 16 bits
388 * core_id is relative to socket, and
389 * we need a global id. So we combine
392 return (s << 16) | (cpu & 0xffff);
395 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
397 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
400 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
402 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
405 /* setup simple routines to easily access node numbers given a cpu number */
406 static int get_max_num(char *path, int *max)
412 if (filename__read_str(path, &buf, &num))
417 /* start on the right, to find highest node num */
419 if ((buf[num] == ',') || (buf[num] == '-')) {
424 if (sscanf(&buf[num], "%d", max) < 1) {
429 /* convert from 0-based to 1-based */
437 /* Determine highest possible cpu in the system for sparse allocation */
438 static void set_max_cpu_num(void)
447 mnt = sysfs__mountpoint();
451 /* get the highest possible cpu number for a sparse allocation */
452 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
453 if (ret == PATH_MAX) {
454 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
458 ret = get_max_num(path, &max_cpu_num);
462 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
465 /* Determine highest possible node in the system for sparse allocation */
466 static void set_max_node_num(void)
475 mnt = sysfs__mountpoint();
479 /* get the highest possible cpu number for a sparse allocation */
480 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
481 if (ret == PATH_MAX) {
482 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
486 ret = get_max_num(path, &max_node_num);
490 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
493 int cpu__max_node(void)
495 if (unlikely(!max_node_num))
501 int cpu__max_cpu(void)
503 if (unlikely(!max_cpu_num))
509 int cpu__get_node(int cpu)
511 if (unlikely(cpunode_map == NULL)) {
512 pr_debug("cpu_map not initialized\n");
516 return cpunode_map[cpu];
519 static int init_cpunode_map(void)
526 cpunode_map = calloc(max_cpu_num, sizeof(int));
528 pr_err("%s: calloc failed\n", __func__);
532 for (i = 0; i < max_cpu_num; i++)
538 int cpu__setup_cpunode_map(void)
540 struct dirent *dent1, *dent2;
542 unsigned int cpu, mem;
548 /* initialize globals */
549 if (init_cpunode_map())
552 mnt = sysfs__mountpoint();
556 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
558 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
562 dir1 = opendir(path);
566 /* walk tree and setup map */
567 while ((dent1 = readdir(dir1)) != NULL) {
568 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
571 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
573 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
580 while ((dent2 = readdir(dir2)) != NULL) {
581 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
583 cpunode_map[cpu] = mem;
591 bool cpu_map__has(struct cpu_map *cpus, int cpu)
595 for (i = 0; i < cpus->nr; ++i) {
596 if (cpus->map[i] == cpu)